CN101071259A - Optical source control device and image display device - Google Patents
Optical source control device and image display device Download PDFInfo
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- CN101071259A CN101071259A CN 200710103208 CN200710103208A CN101071259A CN 101071259 A CN101071259 A CN 101071259A CN 200710103208 CN200710103208 CN 200710103208 CN 200710103208 A CN200710103208 A CN 200710103208A CN 101071259 A CN101071259 A CN 101071259A
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Abstract
Provided is a light source control device which can quickly change the quantity of light generated by the solid light source to the target quantity of light and the image display device. The control part (22) according to the relationship between the drive current supplied by the light source driver (24) and the emitted quantity of light detected by the photo-sensor (21), obtain the chart (drive current to light quantity character) according to the ambient temperature of LED11, on account of the obtained chart to control the drive current, so as t make the emitted quantity of light become the target quantity of light.
Description
Technical field
The present invention relates to possess the light source control device and the image display device of solid light source.
Background technology
In the past, the image display device (for example, patent documentation 1) of known solid light source that possess LED (Light Emitting Diode) and LD (Laser Diode) etc. arranged and optical modulation element that the light that solid light source sent is modulated.At this, if to the solid light source supplying electric current, then solid light source produces heat.If the environment temperature of solid light source uprises, then the light quantity of solid light source ejaculation just reduces.
In addition, in order to suppress the minimizing of the hot caused light quantity that solid light source produces, and proposed to be provided with the image display device (for example, patent documentation 2) of the cooling element that is used for the solid light source cooling.At this, if give an example LED (light emitting diode) light source, then the drive current of led light source-light quantity characteristic changes with the variation of the environment temperature of led light source as can be known.
For example, red LED as shown in Figure 3, has along with the rising of drive current quantity of light emission and rises to after a certain degree halfway the characteristic that quantity of light emission on the contrary descends (below, be sometimes referred to as overvoltage (over roll)).In addition, red LED has: even give identical drive current, and the characteristic that quantity of light emission descends significantly when environment temperature is high.At this, for example, the T1 that establishes among the figure is room temperature (for example being 20 ℃), the steady temperature when T2 is light source igniting (for example being 80 ℃), and T3 is the temperature higher than steady temperature.That is, the pass of environment temperature is T1＜T2＜T3.
Generally, the control that supplies to the drive current of solid light source is carried out with step width (Δ C) unit that stipulates.That is, when deficiency in light quantity that solid light source sends, increase on the basis of drive current at the step width with regulation, whether the light quantity that solid light source is sent reached the target light quantity is judged.Come the controlling and driving electric current by carrying out above-mentioned processing repeatedly, so that the light quantity that solid light source sends becomes constant light quantity (target light quantity).
Patent documentation 1: TOHKEMY 2006-18196 communique
Patent documentation 2: TOHKEMY 2004-144794 communique (claim 1, [0036], [0037], Fig. 3)
But in the prior art, because the control of drive current carries out with the step width unit of regulation, therefore the light quantity sent of solid light source can not promptly become the target light quantity sometimes.That is, as shown in Figure 3, drive current-light quantity characteristic is subjected to the influence of the environment temperature of solid light source, therefore is difficult to the recruitment of the drive current of decision solid light source, so that the light quantity that solid light source sends becomes the target light quantity.
Summary of the invention
The present invention proposes in view of the above problems, and its purpose is, provides a kind of light quantity that solid light source is sent promptly to become the light source control device and the image display device of target light quantity.
In addition, its purpose is, provides a kind of control to be located at load on solid light source and the cooling element, and can seek the image display device that the brightness of image improves.
A feature of the present invention, light source control device possesses: light source drive, solid light source is supplied with drive current; Optical sensors detects the quantity of light emission of described solid light source; Reservoir part is kept for representing the characteristic information of the relation between described drive current and the described quantity of light emission by each environment temperature of described solid light source; And control assembly, the described drive current that described light source drive is supplied with is controlled; Described control assembly, relation between the detected described quantity of light emission of described drive current of supplying with according to described light source drive and described optical sensors, obtain the described characteristic information corresponding from described reservoir part with the environment temperature of described solid light source, and based on obtained described characteristic information, control described drive current, so that described quantity of light emission becomes the target light quantity.
According to the feature that relates to, control assembly, relation between the detected quantity of light emission of drive current of supplying with according to light source drive and optical sensors, obtain environment temperature corresponding characteristics information with solid light source, and come the controlling and driving electric current based on obtained characteristic information (drive current-light quantity characteristic), so that quantity of light emission becomes the target light quantity.
That is, because under the state of holding with the environment temperature corresponding characteristics signal (drive current-light quantity characteristic) of solid light source, therefore the drive current of control solid light source can easily determine to be used to make quantity of light emission to become the control of the drive current of target light quantity.Thereby the light quantity that solid light source is sent promptly becomes the target light quantity.
In the above-mentioned feature of the present invention, as preferably, described control assembly, when the pairing described characteristic information of the environment temperature of described solid light source is not stored into described reservoir part, from the described characteristic information that is stored into described reservoir part, the pairing described characteristic information of environment temperature that environment temperature specific and described solid light source is approaching, based on specific described characteristic information, calculate the pairing described characteristic information of environment temperature of described solid light source, and based on the described characteristic information of being calculated, control described drive current, so that described quantity of light emission becomes the target light quantity.
In the above-mentioned feature of the present invention, as preferably, described control assembly, being no more than the described drive current that makes described quantity of light emission become maximum in obtained above-mentioned characteristic information is in the scope of maximum drive current, and the described drive current that described light source drive is supplied with is controlled.
In the feature of the present invention, image display device possesses: at least one optical modulation element, the ejaculation light of solid light source is modulated; Projecting lens, the light that described at least one optical modulation element is modulated carries out projection; With the above-mentioned relevant light source control device of feature of the present invention.
In the feature of the present invention, image display device possesses: at least one optical modulation element, the ejaculation light of a plurality of solid light sources is modulated; Projecting lens, the light that described at least one optical modulation element is modulated carries out projection; With the above-mentioned relevant light source control device of feature of the present invention.Described control assembly, when the described drive current of a solid light source that contains in described a plurality of solid light sources is controlled in the mode that surpasses described maximum drive current, keep the white balance that the ejaculation light by described a plurality of solid light sources is reproduced, and control the described drive current of other solid light sources that contain in described a plurality of solid light source.
In the feature of the present invention, image display device possesses: solid light source (solid light source 110); Optical modulation element (liquid crystal panel 150) is modulated the light that described solid light source sends; Cooling element (Peltier's element 120) cools off described solid light source; Signal receiving part (picture signal is accepted portion 310), reception is used for the picture signal of the modulation voltage of definite described optical modulation element; With cooling Power control part (cooling Power control part 330),, control the cooling Power of described cooling element according to the described picture signal that described signal receiving part received.
According to the feature that relates to, the cooling Power control part by control the cooling Power of cooling element according to the picture signal that signal receiving part received, can make and not continue the high electric current that flows in the cooling element, can suitably reduce the environment temperature of solid light source thus.Thereby, even do not increase the magnitude of current of supplying with solid light source, the brightness that yet can improve image as required.
That is, suppress to be arranged on the load in solid light source and the cooling element, and can realize the brightness of image.
In the above-mentioned feature of the present invention, as preferably, described solid light source is by each the set a plurality of solid light source that is arranged on a plurality of cut zone in the described optical modulation element; Described cooling element is each the set a plurality of cooling element by described a plurality of solid light sources; Described cooling Power control part is controlled the cooling Power of described a plurality of cooling elements according to the pairing described picture signal of described cut zone.
In the above-mentioned feature of the present invention, described cooling element is to have the Peltier's element that supply by electric current absorbs the heat-absorbent surface (heat-absorbent surface 21) of heat and transmits the radiating surface (radiating surface 22) of the heat that the supply by electric current absorbs by described heat-absorbent surface, described heat-absorbent surface is provided with described solid light source, and described radiating surface is provided with the thermal component (heat radiator 130) that is used to make the heat that is delivered to described radiating surface to shed.
In the above-mentioned feature of the present invention, as preferably, image display device also possesses: drive current control part (drive current control part 340), control the drive current of described solid light source; And test section (temperature sensor 70), detect the environment temperature of described solid light source; Described cooling Power control part is being judged to be when surpassing defined threshold according to the brightness of the shown image of described picture signal, before the image that brightness surpasses described defined threshold is shown, strengthens the cooling Power of described cooling element; Described drive current control part reduces the drive current of described solid light source according to the mode with the decline interlock of the environment temperature of described solid light source, when the image that brightness surpasses described defined threshold is shown, increases the drive current of described solid light source.
According to the present invention, provide a kind of light quantity that solid light source is sent promptly to become the light source control device and the image display device of target light quantity.
Description of drawings
Fig. 1 is the key diagram of example of optical system of the projection type video display device of expression first embodiment.
Fig. 2 is the key diagram that is used for the light source control device of example first embodiment.
Fig. 3 is the chart of expression based on the drive current-light quantity characteristic of temperature.
Fig. 4 is the key diagram of content that is used to represent the form of first embodiment.
Fig. 5 is the process flow diagram of summary of the projection type video display device 200 of expression second embodiment.
Fig. 6 is the figure that the summary of the lighting unit 220 of expression second embodiment constitutes.
Fig. 7 is the block diagram of formation of the control circuit 250 of expression second embodiment.
Fig. 8 is the figure of an example of the characteristics of luminescence of the solid light source 110 of expression second embodiment.
Fig. 9 is the figure of control method of cooling Power of amber ear card (Peltier) element 120 of expression second embodiment.
Figure 10 is the process flow diagram of action of the projection type video display device 200 of expression second embodiment.
Figure 11 is the figure of control method of cooling Power that is used to illustrate the Peltier's element 120 of the 3rd embodiment.
Figure 12 is the block diagram of formation of the control circuit 250 of expression the 4th embodiment.
Figure 13 is the figure of control method of the cooling Power of expression Peltier's element 120.
Description of drawings:
The 1-display panels; 2-cross dichroic prism; The 3-projecting lens; 11-LED; The 21-optical sensor; The 22-control part; 23-chart portion; The 24-light source drive; The 51-lighting device; The 110-solid light source; The 120-Peltier's element; The 121-heat-absorbent surface; The 122-radiating surface; The 130-heat radiator; The 140-diffraction element; The 150-liquid crystal panel; 160-cross dichroic cube; The 161a-minute surface; The 160b-minute surface; The 170-temperature sensor; The 200-projection type video display device; The 210-projecting lens unit; The 220-lighting unit; The 250-control circuit; The 300-screen; 310-picture signal reception portion; 320-modulation voltage control part; 330-cooling Power control part; 340-drive current control part.
：：： ？？
Embodiment
Below, with reference to Fig. 1～Fig. 4 first embodiment is described.
Fig. 1 is the key diagram of the optical system of expression projection type video display device.This projection type video display device possesses 3 lighting device 51R, 51G, 51B.Each lighting device 51 possesses: as the LED (light emitting diode) 11 and the rod-type integraph of light source.Described rod-type integraph is made of for example taper rod-type integration part 12 and rectangular shape rod-type integration part 13.Dispose display panels 1R, 1G, 1B in the light exit side of each lighting device 51 as optical modulation element.
Described LED11 is made of led chip 11a and heat radiator (heat sink) 11b.Led chip 11a among the lighting device 51R penetrates red light, and the led chip 11a among the lighting device 51G penetrates green light, and the led chip 11a among the lighting device 51B penetrates blue light.
Display panels 1R, 1G, the 1B of the light transmission of all kinds usefulness of all kinds that each lighting device 51 is emitted generate image light of all kinds.And, image light of all kinds synthesized by cross dichroic prism 2 (also can be the cross dichroic mirror) form coloured image light.This coloured image light is throwed by projecting lens 3.
In addition, though not shown, also can or be provided for the fan (air cooling) of blowing towards heat radiator (heat sink) 11b, liquid coolant is risen in the temperature that heat radiator 11b cocycle suppresses led chip 11a.
Fig. 2 is the block diagram of an example of expression light source control device.Optical sensors 21 is arranged near position on the illumination path.Particularly, be arranged on the inclined side location of led chip 11a, promptly be arranged on the position of departing from slightly from the light entrance face of taper rod-type integration part 12.Control part 22 receives the output of optical sensors 21.The element that optical sensors 21 is changed by light quantity by for example photodiode or resistance value etc. constitutes.In addition, light source drive 24 comes driving LED chip 11a by control part 22 indicated current values.
In chart portion 23, the drive current-light quantity characteristic that keeps the described led chip 11a under a plurality of temperature as shown in Figure 4 is as data drawing list.For example, chart portion 23 is stored into storer after with the drive current among the T1 among above-mentioned Fig. 3, T2, the T3-light quantity performance mumber digital dataization.In addition, each chart also can not have the top and goes up the relevant data of the following drive current-light quantity characteristic of point (maximum drive value of each chart becomes the top and goes up current value before the point).Perhaps also can have the top and go up the following drive current-relevant data of light quantity characteristic of point, become the top and go up the value of the drive current of point and also can but hold in addition.Perhaps control part 22 becomes the value of the drive current of putting on the top of each chart as can be known by the retrieval chart.
Control part 22 is carried out processing (control) shown below.This control content comprises: graph choice is handled (comprise the switching of selecting chart/keep judgements) and based on the driving current value generation processing of selected chart.
(1) control part 22 takes out the pairing light quantity data of driving current value (C) (L) in the moment at present that each chart (chart T1, chart T2, chart T3) has based on the driving current value (C) in the present moment from chart portion 23.For example, as shown in Figure 4, control part 22 takes out light value data (L2) based on the driving current value C1 in the present moment from chart T1, takes out light value data (L1) from chart T2.Take out the light value data of regulation from chart T3.
(2) control part 22 is obtained from each light value data (L) of described chart taking-up and based on the sensor that is received by optical sensors 21 and is exported the poor of resulting present moment light value, and selecting difference is the chart of zero (unanimity).For example, if driving current value constantly is C1 at present, exporting resulting present moment light value based on the sensor that is received by optical sensors 21 is L2, then selects chart T1.That is, the relation between the detected quantity of light emission of the drive current that control part 22 is supplied with according to light source drive 24 and optical sensor 21 obtains environment temperature corresponding characteristics information (chart TI) with LED11 from chart portion 23.Being on duty is not at 0 o'clock, select difference minimum and should difference in the allowed band of regulation the chart of (unanimity).That is, the relation between the detected quantity of light emission of the drive current that control part 22 is supplied with according to light source drive 24 and optical sensor 21 obtains the environment temperature pairing characteristic information (chart) approaching with the environment temperature of LED11 from chart portion 23.When consistent chart does not exist, obtain intermediate value, generate and keep the temporary transient pseudo-chart also can (with reference to the dotted line among Fig. 3) according to 2 adjacent data charts of the mode of optical sensors output valve that is similar to this moment and driving current value.Promptly, control part 22, when the pairing characteristic information of the environment temperature of LED11 (chart) is not stored into chart portion 23, specific and the approaching pairing characteristic information of environment temperature of environment temperature LED11 from the characteristic information that is stored in chart portion 23, and based on specific characteristic information, calculate the pairing characteristic information of environment temperature of LED11.Intermediate value also can by whether with which of described two charts near being weighted.Therefore in addition, chart numbers is easy more more at most to obtain described unanimity (raising precision), and needs bigger memory span on the other hand, by taking into account precision and memory span decides chart numbers.
Control part 22 is handled (select the switching of chart/keep judgement) with the selection that for example at interval, at interval, waited to carry out above-mentioned chart at interval in 10 seconds in 5 seconds in 1 second.
(3) control part 22 is learnt the driving current value (C) that is used to obtain desirable light quantity (L) according to selected chart (or pseudo-chart), and this driving current value (C) is composed to light source drive 24.Light source drive 24 comes driving LED chip 11a by control part 22 indicated driving current value (C).For example, if selected chart is chart T1, desirable light quantity (target light quantity) is L1, and then driving current value is C2.
Though be narration repeatedly, but light quantity L1 is desirable light quantity in described Fig. 3, and the required drive current under the hypothesis steady temperature (T2) during light source igniting is under the situation of C1, at first, when lighting beginning, light source drive 24 is with drive current C1 driving LED chip 11a.Originally to led chip 11a energising, because its temperature is room temperature (T1), so if with drive current C1 driving LED chip 11a then light value should become L2, control part 22 in graph choice is handled, based on present moment light value (sensor output) select chart T1.And control part 22 is learnt C2 as the driving current value that is used to obtain target light quantity L1 from selecting chart, and light source drive 24 is by driving current value C2 driving LED chip 11a.Because the temperature of led chip 11a rises soon, therefore next time or its later graph choice are handled selection chart T2 in (select the switching of chart/keep judgements).So control part 22 obtains C1 as the driving current value that is used to obtain target light quantity L1 from chart T2, and light source drive 24 is by driving current value C1 driving LED chip 11a.
In addition, if what then select chart T3 or pseudo-chart near temperature T 3 to the temperature of hypothesis led chip 11a under certain unfavorable condition.But, by in data drawing list, not recording and narrating current value following on the top (the maximum drive current value of each chart becomes the current value of top before going up) or learning in advance that by control part 22 top goes up point, just can prevent to become the upward situation of the current supply of a side of top that surpasses.
Also can carry out above-mentioned light source control to all lighting devices 51 of 3 primary colors.That is, though depend on the constituent material of LED, also existence or blue led or green LED with temperature its drive current-light quantity characteristic variations or produce the situation of overvoltage.The LED that uses at each color carries out light source control by possessing drive current-light quantity performance data chart, just can carry out suitable control to the quantity of light emission of lighting device of all kinds.
In addition, only drive current-light quantity characteristic is varied with temperature greatly (further, have the overvoltage characteristic) 1 or 2 color light source carry out the light source control that the present invention is correlated with, and being carried out simple FEEDBACK CONTROL (with reference to existing item) with the other light sources of variation of temperature little (in addition, not having the overvoltage characteristic), drive current-light quantity characteristic also can.In addition, target setting light quantity in each color light source, the control that is used to keep these target light quantities is exactly to keep white balance.
In addition, (when importing such picture signal) also can limit the drive current of other color light source in order to keep white balance when the light quantity that point is higher on requiring than the top of the light quantity in the described drive current-light quantity characteristic of a certain color light source increased.In other words, from the situation that prevents to become the current supply that surpasses a side of putting on the top described drive current-light quantity characteristic with keep viewpoint between the white balance, carry out the control that white brightness is subjected to the restriction of putting on the top of drive current-light quantity characteristic of each color light source and also can.
In addition, control part 22 also can received image signal (rgb signal), and resolves the two field picture in this picture signal.Particularly, detect red color intensity (red grey scale signal), green intensity (green grey scale signal), the blue intensities (blue grey scale signal) of each pixel that is used for the configuration frame image.At this, each intensity of colour is made as 0～99, supposes the light transmission amount with each display panels 1 of 100 gray-scale Control, in addition, supposes that each lighting device 51 also carries out the light quantity adjustment with 100 gray scales.If red color intensity is 0 in whole pixels in the two field picture, then control part 22 gives to light source drive 24 that to be used to make the gain of lighting device 51R be the control signal of 0 (minimum light quantity).The described control signal of light source drive 24 receptions is controlled the supplying electric current to lighting device 51R.In addition, to give the light transmission amount that for example makes at the whole pixel of display panels 1R be 0 driving command to 22 pairs of not shown LCD signal Processing of control part.The LCD signal processing part drives the pixel of display panels 1R based on described driving command.The mxm. of red color intensity is 50 o'clock in two field picture, making its light transmission amount at the pixel as this value of 50 is 100, making its quantity of light emission at lighting device 51R is 50 (if selected the state of chart T2, the pairing current value C of light quantity that then obtains L1/2 comes driving light source).About having the pixel of other red color intensity, be 50 revisal as long as the red color intensity based on its original picture signal is applied the quantity of light emission that makes described lighting device 51R.It is minimum that control can make the power consumption in the lighting device 51 like this, but be not limited to such control, for example, also can carry out following control, and promptly making the light transmission amount at the pixel as described 50 value is 70, and to make the quantity of light emission of lighting device 51R be 70.This moment is about having the pixel of other red color intensity, is 70 revisal as long as the red color intensity based on its original picture signal is applied the quantity of light emission that makes described lighting device 51R.In addition, also carrying out identical control about other colors gets final product.
At this, as mentioned above with the luminous quantity of light source (LED) self and picture signal-when playing control, think stationary temperature (T2) when the temperature of light source can't be kept light source igniting, its temperature changes on time shaft continually.According to the present invention,, the temperature of light source can make light source luminous rapidly with the target light quantity even changing also continually thereupon.
In addition, in the above-mentioned example, show 3 board-like projection type video display devices, have the light source that is used for penetrating white light (have the light source of White LED or in the future self-luminous colour mutually the light of different LED of all kinds by synthetic light sources such as cross dichroic cube) one-board projection type video display device or will carry out the light source control that 3 board-like projection type video display devices that look separates also can use the application by for example dichroic mirror from the light of white light light source.Certainly, the light valve that is used for optical modulation is not limited to the liquid crystal panel of infiltration type, also can use the liquid crystal panel of reflection-type, also can use the formed light valve of a plurality of small mirrors of configuration.
In addition, above-mentioned optical sensors 21 be arranged on light source be LED11 near, therefore be subjected to hot caused influence, thereby have the anxiety that can't correctly detect temperature from LED11.So, at the back side of optical sensors 21 heat radiator is set and also can.In addition, the heat radiator of above-mentioned optical sensors cooling usefulness also can integrally form with the heat radiator 11b that is used for cooling LED 11.In addition, the liquid of the internal flow of the heat radiator after also can making this integrally formed cooling usefulness.And, LED11 and the optical sensors 21 pressure cooling body by air cooling fan or liquid cooled etc. cooled off also can.Further, be used to prevent to shine directly into the light light-blocking member of (being used to prevent to produce parasitic light) such as screens sometimes from the light of LED11 in the arranged outside of each above-mentioned lighting device 51.At this moment, also can on this light curtain-shaped cover member, optical sensors 21 be set.In addition, also can constitute this light curtain-shaped cover member by the high material of thermal conductivity, the heat radiator that this light curtain-shaped cover member is also used as optical sensors 21 also can.
In addition, as the characteristic information of the light quantity of the drive current of the described light source under a plurality of relatively temperature, except that above-mentioned drive current-light quantity property database, can also be the functional expression of drive current-light quantity characteristic.
In addition, in the-embodiment, for example understand LED as solid light source, but be not limited to this.Solid light source can certainly be LD (Laser Diode).
(second embodiment)
(summary of image display device)
Below, with reference to the summary of the image display device of description of drawings second embodiment.Fig. 5 is the figure of summary of the projection type video display device 200 of expression second embodiment.
As shown in Figure 5, projection type video display device 200 has projecting lens unit 210, and the image light that projecting lens unit 210 is enlarged is projected on the screen 300.Projecting lens unit 210 has LED (Ligth Emilling Diodc) or LD solid light sources such as (Laser Diode) as light source.
(summary of lighting unit constitutes)
The summary of following lighting unit with reference to description of drawings second embodiment constitutes.Fig. 6 is the figure that the summary of the lighting unit 220 of expression second embodiment constitutes.
As shown in Figure 6, lighting unit 220 has: a plurality of solid light source 110 (solid light source 110R, solid light source 110G and solid light source 110B), a plurality of Peltier's element 120 (Peltier's element 120R, Peltier's element 120G and Peltier's element 120B), a plurality of heat radiator 130 (heat radiator 130R, heat radiator 130G and heat radiator 130B), a plurality of diffraction element 140 (diffraction element 140R, diffraction element 140G and diffraction element 140B), a plurality of liquid crystal panel 150 (liquid crystal panel 150R, liquid crystal panel 150G and liquid crystal panel 150B), with cross dichroic cube 160.
Solid light source 110R sends solid light sources such as red LED that becomes beam split or LD.Solid light source 110R has directionality, and the red composition that solid light source 110R sends is only put light (spot light).Equally, solid light source 110G and solid light source 110B send the green solid light source that becomes beam split and blue LED that becomes beam split or LD etc.Solid light source 110G and solid light source 110B have directionality, and solid light source 110G and the green that solid light source 110B sent become beam split and the beam split of blue one-tenth to be some light.In addition, the shape that should be careful the some light that each solid light source sends can be adjusted to wire shaped (rectangle) by special lenses etc. and also can.
Peltier's element 120R has: absorb the heat-absorbent surface 121R of heat and transmit the radiating surface 122R of the heat that the supply by electric current absorbs by heat-absorbent surface 121R by supplying electric current.Heat-absorbent surface 121R is provided with solid light source 110R, and radiating surface 1222R is provided with heat radiator 130R.
Equally, Peltier's element 120G has heat-absorbent surface 121G and radiating surface 122G, and heat-absorbent surface 121G is provided with solid light source 110G, and radiating surface 122G is provided with heat radiator 130G.Peltier's element 120B has heat-absorbent surface 121B and radiating surface 122B, and heat-absorbent surface 121B is provided with solid light source 110B, and radiating surface 122B is provided with radiating surface 130B.
At this, the cooling Power of Peltier's element 120R, Peltier's element 120G and Peltier's element 120B is by control signal (the control signal C that obtains from control circuit 250 described later
R, control signal C
GAnd control signal C
B) control.
Heat radiator 130R is made of the thermal conductivity parts of metal etc., and the heat of the radiating surface 122R that is delivered to Peltier's element 120R is shed.Equally, heat radiator 130G and heat radiator 130B are made of thermal conductivity parts such as metals, and the heat of the radiating surface 122B of the radiating surface 122G that is delivered to Peltier's element 120G and Peltier's element 120B is shed.In addition, the cooling fan (not shown) that preferably is communicated with by the outside with projecting lens unit 210 of heat radiator 130R, heat radiator 130G and heat radiator 130B cools off.
The red composition light uniformization that diffraction element 140R sends solid light source 110R, the red composition illumination after the homogenising is mapped to liquid crystal panel 150R.Equally, the green that diffraction element 140G and diffraction element 140B send solid light source 110G and solid light source 110B becomes beam split and blue composition light uniformization, and the green after the homogenising becomes beam split and blue composition illumination to be mapped to liquid crystal panel 150G and liquid crystal panel 150B.
160 couples of liquid crystal panel 150R of cross dichroic cube, liquid crystal panel 150G and the emitted redness of liquid crystal panel 150B become beam split, the beam split of green one-tenth and the beam split of blue one-tenth to synthesize.Particularly, cross dichroic cube 160 has: become beam split to reflex to projecting lens unit 210 sides redness, and with green composition light transmission to the minute surface 161a of projecting lens unit 210 sides with blueness is become beam split reflex to projecting lens unit 210 sides, and with green composition light transmission to the minute surface 161b of projecting lens unit 210 sides.
Lighting unit 220 (Peltier's element 120 and liquid crystal panel 150) is connected with control circuit 250.
(formation of control circuit)
The formation of following control circuit with reference to description of drawings second embodiment.Fig. 7 is the block diagram of formation of the control circuit 250 of expression second embodiment.
As shown in Figure 7, control circuit 250 has: picture signal reception portion 310, modulation voltage control part 320, cooling Power control part 330.
Picture signal reception portion 310 receives received image signal (red input signal R
In, green input signal G
InAnd blue input signal B
In) interface.Picture signal reception portion 310 is input to modulation voltage control part 320 and cooling Power control part 330 with received image signal.
Modulation voltage control part 320 is controlled the modulation voltage of each liquid crystal panel 150 according to received image signal.Particularly, modulation voltage control part 320 is according to red input signal R
InDecide red output signal R
Out, with red output signal R
OutBe input to liquid crystal panel 150R.Equally, modulation voltage control part 320 is according to green input signal G
InAnd blue input signal B
InDecide green output signal G
OutAnd blue output signal B
Out, and with green output signal G
OutAnd blue output signal B
OutBe input to liquid crystal panel 150G and liquid crystal panel 150B.
At this, should be careful modulation voltage control part 320 and carry out γ revisal processing etc. as required.
Cooling Power control part 330 is controlled the cooling Power of each Peltier's element 120 according to received image signal.Particularly, cooling Power control part 330 is according to red input signal R
InDecide control signal C
R, with control signal C
RBe input to Peltier's element 120R.At this, cooling Power control part 330 is based on red input signal R
InCome specific projection to become the brightness of beam split, redly become the brightness of beam split high more, be used to strengthen the control signal C of the cooling Power of Peltier's element 120R more to Peltier's element 120R input to the redness on the screen 300
R
Equally, cooling Power control part 330 is according to green input signal G
InAnd blue input signal B
InDecide control signal C
GAnd control signal C
B, and with control signal C
GAnd control signal C
BBe input to Peltier's element 120G and Peltier's element 120B.At this, cooling Power control part 330 is based on green input signal G
InAnd blue input signal B
InCome specific projection to become the brightness of beam split and the beam split of blue one-tenth to the green on the screen 300, green become beam split and bluely become the brightness of beam split high more, be used to strengthen the control signal C of the cooling Power of Peltier's element 120G and Peltier's element 120B more to Peltier's element 120G and Peltier's element 120B input
GAnd control signal C
B
For example, cooling Power control part 330 according to received image signal specific brightness be that defined threshold is when following, control the cooling Power of each Peltier's element 120 with common ability mode, according to received image signal specific brightness when surpassing defined threshold, control the cooling Power of each Peltier's element 120 with high ability mode.High ability mode is meant the pattern that cooling Power is strengthened than common ability mode.
In addition, the cooling Power that cooling Power control part 330 has the brightness that makes colour content light and a Peltier's element 120 is set up the chart of corresponding relation, also can decide control signal with reference to this chart.At this, it is high more and cooling Power Peltier's element 120 is just high more to be careful brightness in this chart.
(example of the characteristics of luminescence of solid light source)
One example of the characteristics of luminescence of the solid light source of second embodiment is described with reference to the accompanying drawings.Fig. 8 is the figure of example of the characteristics of luminescence of the solid light source 110 of expression second embodiment.
As shown in Figure 8, the light of solid light source 110 output (light quantity) depends on the environment temperature (Tc) of solid light source 110.Particularly, the environment temperature of solid light source 110 (Tc) is low more, and the light output of solid light source 110 is just big more.That is, the cooling Power of Peltier's element 120 is high more, and the light output of light source 110 is just big more.
(control method of the cooling Power of cooling element)
The control method of the cooling Power of following cooling element with reference to description of drawings second embodiment.Fig. 9 is the figure of control method of cooling Power of the Peltier's element 120 of expression second embodiment.
Shown in Fig. 9 (a), illustrate frame f
3～frame f
4Brightness be higher than other frames (frame f
1, frame f
2And frame f
5) the situation of brightness.
Shown in Fig. 9 (b), according at frame f
3～frame f
4In the pairing time domain, with other frames (frame f
1, frame f
2And frame f
5) the pairing time domain mode of comparing, make the environment temperature (Tc) of solid light source 110 to reduce controls the cooling Power of Peltier's element 120.
Thereby, shown in Fig. 9 (c), at frame f
3～frame f
4In the pairing time domain, with other frames (frame f
1, frame f
2And frame f
5) pairing time domain compares, the magnitude of current of the electric current supplied with to Peltier's element 120 is many.
That is, at frame (frame f
1, frame f
2And frame f
5) in the pairing time domain, control the cooling stress of each Peltier's element 120 with common ability mode, at frame f
3～frame f
4In the pairing time domain, control the cooling stress of each Peltier's element 120 with high ability mode.
(action of image display device)
The action of following image display device with reference to description of drawings second embodiment.Figure 10 is the process flow diagram of action of the projection type video display device 200 of expression second embodiment.
As shown in figure 10, in step 10, projection type video display device 200 receives received image signal (red input signal R
In, green input signal G
InAnd blue input signal B
In).
In step 20, projection type video display device 200 decides output image signal (red output signal R according to received image signal
Out, green output signal G
OutAnd blue output signal B
Out), and control the modulation voltage of each liquid crystal panel 150 according to output image signal.
In step 30, projection type video display device 200 is judged the brightness that projects to the image on the screen 300 according to received image signal.Particularly, projection type video display device 200 is according to red input signal R
InJudge the brightness of red one-tenth beam split.Equally, projection type video display device 200 is according to green input signal G
InAnd blue input signal B
InJudge the brightness of beam split of green one-tenth and the beam split of blue one-tenth.
In step 40, whether projection type video display device 200 becomes the brightness of beam split, the beam split of green one-tenth and the beam split of blue one-tenth to judge above defined threshold to redness respectively.In addition, when the brightness of image (red become beam split, greenly become beam split and bluely become beam split) surpasses defined threshold, the divide a word with a hyphen at the end of a line processing of step 60 of projection type video display device 200, the processing of the step 50 of when the brightness of image (red become beam split, greenly become beam split and bluely become beam split) is no more than defined threshold, dividing a word with a hyphen at the end of a line.
In step 50, projection type video display device 200 is with the cooling Power of common ability mode control Peltier's element 120 (Peltier's element 120R, amber ear card 120G or Peltier's element 120B).In addition, the processing that should be careful step 50 is only to be judged to be the pairing Peltier's element of the colour content light that is no more than defined threshold 120 as object.
In step 60, projection type video display device 200 is with the cooling Power of high ability mode control Peltier's element 120 (Peltier's element 120R, Peltier's element 120G or Peltier's element 120B).In addition, the processing that should be careful step 50 is only to be judged to be above the pairing Peltier's element of the colour content light of defined threshold 120 as object.
In addition, yes carries out synchronously for the processing of the processing of step 20 and step 50 (or step 60).Synchronous for the processing of the processing that makes step 20 and step 50 (or step 60), also can use the frame buffer that can accumulate the pairing received image signal of 1 frame.
(effect and effect)
Projection type video display device 200 according to second embodiment, the received image signal that cooling Power control part 330 is received according to picture signal reception portion 310 is controlled the cooling Power of Peltier's element 120, thereby can not make Peltier's element 120 continue to flow through high electric current, can suitably reduce the environment temperature of solid light source 110 thus.Thereby, the magnitude of current of the solid light source 110 of not increasing supply, the brightness that also can improve image as required.
That is, not only suppress to be arranged on the load of solid light source 110 and Peltier's element 120, and the brightness that can improve image.
(the 3rd embodiment)
Following with reference to description of drawings the 3rd embodiment.Below above-mentioned second embodiment of main explanation and the difference between the 3rd embodiment.
Particularly, though be not particularly related in the second above-mentioned embodiment, but in the 3rd embodiment, solid light source is by every-individual setting that is arranged on a plurality of cut zone in the optical modulation element, and cooling element is provided with by each of a plurality of solid light sources.Control each cooling element according to the pairing received image signal of cut zone.
(control method of the cooling Power of cooling element)
The control method of the cooling Power of following cooling element with reference to description of drawings the 3rd embodiment.Figure 11 is the synoptic diagram of control method of cooling Power that is used to illustrate the Peltier's element 120 of the 3rd embodiment.
Shown in Figure 11 (a), each solid light source 110 (solid light source 110
1-1～solid light source 110
5-3) by a plurality of cut zone (cut zone
1-1～solid light source 110
5-3) every-individual setting, and be configured to array-like.Each Peltier's element 120 (Peltier's element 120
1-1～Peltier's element 120
5-3) be provided with by each of a plurality of solid light sources 110.
Shown in Figure 11 (b), illustrate cut zone
3-1, cut zone
2-2, cut zone
3-2And cut zone
4-2The brightness of (high brightness cut zone) is higher than the situation of other cut zone (brightness cut zone usually).
The pairing Peltier's element 120 (Peltier's element 120 of high brightness cut zone
3-1, Peltier's element 120
2-2, Peltier's element 120
3-2And Peltier's element 120
4-2) cooling Power control with high ability mode.On the other hand, the cooling Power of the pairing Peltier's element 120 of brightness cut zone is controlled with common ability usually.
(effect and effect)
Projection type video display device 200 according to the 3rd embodiment, cooling Power control part 330 is controlled cooling Power by each set Peltier's element 120 of a plurality of cut zone respectively according to the pairing received image signal of cut zone, thereby suppress to be arranged on the load on solid light source 110 and the Peltier's element 120, and the brightness that can suitably improve image.
(the 4th embodiment)
Following with reference to description of drawings the 4th embodiment.Below above-mentioned second embodiment of main explanation and the difference between the 4th embodiment.Particularly, in the second above-mentioned embodiment, do not touch especially, but in the 4th embodiment, except that the cooling Power of Peltier's element 120, the drive current of solid light source 110 is controlled for the drive current of solid light source 110.
(formation of control circuit)
The formation of following control circuit with reference to description of drawings the 4th embodiment.Figure 12 is the block diagram of formation of the control circuit 250 of expression the 4th embodiment.In addition, should be careful among Figure 12 for the attached and identical symbol of the formation identical with the second above-mentioned embodiment.
As shown in figure 12, control circuit 250 has drive current control part 340 except that formation shown in Figure 7.In addition, on each solid light source 110, be provided with the temperature sensor 170 (temperature sensor 170R, temperature sensor 170G, temperature sensor 170B) of the environment temperature that is used to measure each solid light source 110 simultaneously.
At this, in the 4th embodiment, should be careful cooling Power control part 330 being judged to be according to the brightness of the determined image of received image signal when higher, before the image of exhibit high brilliance, strengthen the cooling Power of each Peltier's element 120 in advance.
Particularly, cooling Power control part 330 has the frame buffer that is used to accumulate the pairing received image signal of 1～a plurality of frames.330 pairs of present frames of cooling Power control part shown frame after predetermined distance judges promptly whether the brightness of frame (image) surpasses defined threshold and judge.Cooling Power control part 330 surpasses under the situation of defined threshold in the brightness of judging frame (image), when showing present frame, strengthens the cooling Power of each Peltier's element 120.
At this, should be careful present frame and judge between the frame predetermined distance according to for example from the reinforcement of the cooling Power of Peltier's element 120 be instructed to the back till solid light source 110 actual being cooled during (cooling period) come definite.
Drive current control part 340 is based on obtained received image signal (the red input signal R of picture signal reception portion 310
In, green input signal G
InAnd blue input signal B
In) and environment temperature (the environment temperature T of the obtained solid light source 110 of each temperature sensor 170
R, environment temperature T
CAnd environment temperature T
B) control the drive current of each solid light source 110.
Particularly, drive current control part 340 is according to red input signal R
InSpecific redness to become the brightness of beam split be the environment temperature T of defined threshold following (ability mode usually), solid light source 110R
RDuring decline, will according to environment temperature T
RThe mode of interlock is indicated the control signal I of minimizing of the drive current of solid light source 110R
RBe input to solid light source 110R.On the other hand, drive current control part 340 is according to red input signal R
InSpecific redness when becoming the brightness of beam split to surpass defined threshold, will be used to indicate the control signal I of increase of the drive current of solid light source 110R
RBe input to solid light source 110R.
Equally, drive current control part 340 is according to green input signal G
InAnd blue input signal B
InSpecific green become beam split and blue to become the brightness of beam split be defined threshold following (ability mode usually), environment temperature T
CAnd environment temperature T
BDuring decline, will according to environment temperature T
CAnd environment temperature T
BThe mode of interlock is indicated the control signal I of minimizing of the drive current of solid light source 110G and solid light source 110B
GAnd control signal I
BBe input to solid light source 110G and solid light source 110B.On the other hand, drive current control part 340 is according to green input signal G
InAnd blue input signal B
InSpecific green when becoming beam split and the blue brightness that becomes beam split to surpass defined threshold, with the control signal I of the increase of the drive current of indication solid light source 110G and solid light source 110B
GAnd control signal I
BBe input to solid light source 110G and solid light source 110B.
In addition, the action of modulation voltage control part 320, cooling Power control part 330 and drive current control part 340 is by the frame buffer that can accumulate received image signal etc. and be self-evident synchronously.
(control method of the cooling Power of cooling element)
The control method of the cooling Power of following cooling element with reference to description of drawings the 4th embodiment.Figure 13 is the figure of control method of cooling Power of the Peltier's element 120 of expression the 4th embodiment.
Shown in Figure 13 (a), list frame f
5Brightness be higher than other frames (frame f
1～frame f
4) the situation of brightness.
Shown in Figure 13 (b), with frame f
3(that is frame f that, specific luminance is high in the corresponding time domain
5Pairing time domain is also before predetermined distance), judge frame f
5Brightness surpass defined threshold, and the cooling Power of control Peltier's element 120 is so that the environment temperature of solid light source 110 (Tc) reduces.
Shown in Figure 13 (c), with environment temperature (Tc) interlock of solid light source 110, and the mode that reduces the drive current of solid light source 110 is controlled.On the other hand, at the high frame f of brightness
5In the pairing time domain, control in the mode that the drive current of solid light source 110 increases.
Thereby, shown in Figure 13 (d), at frame f
1～frame f
4The brightness of image remains necessarily in the pairing time domain, the frame f that brightness is high
5The brightness of image increases in the pairing time domain.
(effect and effect)
In addition, drive current control part 340 makes the drive current of solid light source 110 reduce with environment temperature (Tc) interlock of solid light source 110.On the other hand, drive current control part 340 increases the drive current of solid light source 110 when the high image of brightness is shown.
Thereby, when hanging down according to the brightness of the determined image of received image signal, the light quantity that solid light source 110 sends can be remained necessarily, and according to the brightness of the determined figure of received image signal when higher, the light quantity that solid light source 110 is sent increases.In addition, according to the control of the drive current of solid light source 110, compare with the situation that light quantity that cooling Power by Peltier's element 120 sends solid light source 110 increases, the light quantity that solid light source 110 is sent increases as early as possible.
(other embodiments)
The present invention is illustrated by above-mentioned embodiment, but the argumentation and the accompanying drawing that form the part of the disclosure should not be construed as limiting this invention.Allow from the disclosure and those skilled in the art know that various replacement embodiments, embodiment and application technology.
For example, in the above-mentioned embodiment, image display device is a projection type video display device 200, but so long as be used for the device of display image, is not limited to the projection type device.
Do not touch especially in the above-described embodiment, projection type video display device 200 is according to received image signal, except that the cooling Power of cooling element the electric current that supplies to solid light source controlled and also can.At this moment, consider the environment temperature of solid light source and supply to relation (with reference to Fig. 8) between the electric current of solid light source, the cooling Power that supplies to cooling element and the electric current of solid light source are controlled.
In the above-mentioned embodiment, the cooling Power of Peltier's element 120 is controlled with 2 grades (ability mode and high ability modes usually), but is not limited thereto.Particularly, the cooling Power of Peltier's element 120 with control more than 3 grades also can, not with interim and control with linearity and also can.
In the above-mentioned embodiment, permeation type liquid crystal panel (liquid crystal panel 150) makes as optical modulation element, but is not limited thereto.Particularly, optical modulation element also can be DMD (DigitalMicro-mirror Device) or LCOS (Liquid Crystal on Silicon).
In the above-mentioned embodiment, the thermal component that the heat that is used for being delivered to the radiating surface 22 of Peltier's element 120 sheds is a heat radiator, but is not limited to this.Particularly, also can shed by the heat that liquid cooled will be delivered to the radiating surface 22 of Peltier's element 120.
In the above-mentioned embodiment, modulation voltage control part 320 also can be according to received image signal (red input signal R
In, green input signal G
InAnd blue input signal B
In) combination adjust output image signal (red output signal R
Out, green output signal G
OutAnd blue output signal B
Out).Further, modulation voltage control part 320 is adjusted output image signal according to parameter (amount of drive current, heat dissipation capacity, chromaticity coordinate etc.) intrinsic in each intrinsic light source 110 and also can except that received image signal.
In the above-mentioned embodiment, modulation voltage control part 320 also can be according to cooling Power (the control signal C of Peltier's element 120
R, control signal C
cAnd control signal C
B) adjust output image signal (red output signal R
Out, green output signal G
OutAnd blue output signal B
Out).
In the above-mentioned embodiment, cooling Power control part 330 not only uses the monochrome information of received image signal, also can use information such as the chroma of received image signal or form and aspect to control the cooling Power of Peltier's element 120.
In the above-mentioned embodiment, during till being instructed to the back and in fact being cooled in order to ensure reinforcement (cooling period) to solid light source 110 from the cooling Power of Peltier's element 120, the pairing received image signal of 1～a plurality of frames is accumulated frame buffer, also can according to the cooling Power (feed-forward mode) of the received image signal control Peltier's element 120 of accumulating frame buffer.In the feed-forward mode, there is the situation that needs jumbo frame buffer according to the response speed (cooling period) of Peltier's element 120.
On the other hand, even the little situation of the capacity of frame buffer or do not use the situation of frame buffer when the image that is suitable for high ability mode continues, should be careful the state of making the high brightnessization that can realize image gradually in the scope of regulation frame.
Claims (9)
1, a kind of light source control device possesses:
Light source drive is supplied with drive current to solid light source;
Optical sensors detects the quantity of light emission of described solid light source;
Reservoir part is kept for representing the characteristic information of the relation between described drive current and the described quantity of light emission by each environment temperature of described solid light source; With
Control assembly is controlled the described drive current that described light source drive is supplied with;
Described control assembly,
Relation between the detected described quantity of light emission of described drive current of supplying with according to described light source drive and described optical sensors obtains the described characteristic information corresponding with the environment temperature of described solid light source from described reservoir part, and
Based on obtained described characteristic information, control described drive current, so that described quantity of light emission becomes the target light quantity.
2, light source control device according to claim 1 is characterized in that,
Described control assembly,
When the pairing described characteristic information of the environment temperature of described solid light source is not stored into described reservoir part, from the described characteristic information that is stored into described reservoir part, the pairing described characteristic information of environment temperature that environment temperature specific and described solid light source is approaching
Based on specific described characteristic information, calculate the pairing described characteristic information of environment temperature of described solid light source, and
Based on the described characteristic information of being calculated, control described drive current, so that described quantity of light emission becomes the target light quantity.
3, according to claim 1 or the described light source control device of claim 2, it is characterized in that,
Described control assembly is in the scope of maximum drive current being no more than the described drive current that makes described quantity of light emission become maximum, and the described drive current that described light source drive is supplied with is controlled.
4, a kind of image display device possesses:
At least one optical modulation element is modulated the ejaculation light of solid light source;
Projecting lens, the light that described at least one optical modulation element is modulated carries out projection; With
Each described light source control device in claim 1～claim 3.
5, a kind of image display device possesses:
At least one optical modulation element is modulated the ejaculation light of a plurality of solid light sources;
Projecting lens, the light that described at least one optical modulation element is modulated carries out projection; With
The described light source control device of claim 3;
Described control assembly, when the described drive current of a solid light source that contains in described a plurality of solid light sources is controlled in the mode that surpasses described maximum drive current, keep the white balance that the ejaculation light by described a plurality of solid light sources is reproduced, and control the described drive current of other solid light sources that contain in described a plurality of solid light source.
6, a kind of image display device possesses:
Solid light source;
Optical modulation element is modulated the light that described solid light source sends;
Cooling element cools off described solid light source;
Signal receiving part, reception is used for the picture signal of the modulation voltage of definite described optical modulation element; With
The cooling Power control part according to the described picture signal that described signal receiving part received, is controlled the cooling Power of described cooling element.
7, image display device according to claim 6 is characterized in that,
Described solid light source is by each the set a plurality of solid light source that is arranged on a plurality of cut zone in the described optical modulation element;
Described cooling element is each the set a plurality of cooling element by described a plurality of solid light sources;
Described cooling Power control part according to the pairing described picture signal of described cut zone, is controlled the cooling Power of described a plurality of cooling elements.
8, image display device according to claim 6 is characterized in that,
Described cooling element is to have a Peltier's element that supply by electric current absorbs the heat-absorbent surface of heat and transmits the radiating surface of the heat that the supply by electric current absorbs by described heat-absorbent surface,
Described heat-absorbent surface is provided with described solid light source,
Described radiating surface is provided with the thermal component that is used to make the heat that is delivered to described radiating surface to shed.
9, image display device according to claim 6 is characterized in that,
Also possess:
The drive current control part is controlled the drive current of described solid light source; With
Test section detects the environment temperature of described solid light source,
Described cooling Power control part is being judged to be when surpassing defined threshold according to the brightness of the shown image of described picture signal, before the image that brightness surpasses described defined threshold is shown, strengthens the cooling Power of described cooling element,
Described drive current control part reduces the drive current of described solid light source according to the mode with the decline interlock of the environment temperature of described solid light source, when the image that brightness surpasses described defined threshold is shown, increases the drive current of described solid light source.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006134363 | 2006-05-12 | ||
| JP2006134363 | 2006-05-12 | ||
| JP2006296544 | 2006-10-31 |
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| Publication Number | Publication Date |
|---|---|
| CN101071259A true CN101071259A (en) | 2007-11-14 |
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ID=38898536
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200710103208 Pending CN101071259A (en) | 2006-05-12 | 2007-05-10 | Optical source control device and image display device |
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| CN112312107A (en) * | 2020-11-06 | 2021-02-02 | 歌尔光学科技有限公司 | Optical path control method, device, equipment and storage medium |
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