TWI814558B - Backlight module of illuminated keyboard - Google Patents

Abstract

The invention discloses a backlight module of illuminated keyboard including a light guide plate, a first light-emitting unit, a second light-emitting unit, a first resistor, a second resistor, a circuit board, and a light-shielding plate. The light guide plate includes a first backlight area and a second backlight area, each of which includes a plurality of keycap backlight areas. The first light-emitting unit includes a plurality of light-emitting elements, which are disposed corresponding to the through holes in the keycap areas of the first backlight area, respectively. The second light-emitting unit includes a plurality of light-emitting elements, which are disposed corresponding to the through holes in the keycap areas of the second backlight area, respectively. The first resistor is electrically connected to the first light-emitting unit in series, and the second resistor is electrically connected to the second light-emitting unit in series. The light-shielding plate includes a planar area and a plurality of protruding areas, and the light-emitting elements are arranged corresponding to the protruding areas, respectively. The sum of first areas of the openings in the keycap backlight areas of the first backlight area is not equal to the sum of second areas of the openings in the keycap backlight areas of the second backlight area.

Description

Luminous keyboard backlight module

The present invention relates to a keyboard, and in particular to a luminous keyboard and its backlight module.

The backlight module of the currently popular luminous keyboard mainly includes four major components, including a light shield, a light guide plate (LGP), a reflector, and a light bar in order from the keyboard down. This type of backlight module will place all the light-emitting elements on the same light bar. The light bar will be placed near the center of the backlight module, so that the light emitted by the light-emitting elements on the light bar will enter the light guide plate on both sides. , and then distribute the light on the back side of the keyboard through the light guide plate to form the keyboard backlight.

However, this type of luminous keyboard has the problems of thick thickness and uneven light. Currently, another luminous module structure of luminous keyboard is proposed, which installs the luminous elements on the circuit board and stacks the keycaps sequentially from top to bottom. , scissor legs, iron plate, black matrix (BM), light guide plate, reflective sheet, multi-layer structure of circuit board. However, since the height of the light-emitting diode (LED) of current light-emitting components is as thin as 0.15mm, in order to reduce the overall thickness and improve the brightness and uniformity of the light, it is necessary to consider further improvements in its design method.

In addition, current luminous keyboards are equipped with resistors to control the brightness of the entire backlight module; if there are N light-emitting elements, N resistors are used to control the brightness of each light-emitting element respectively to control the overall brightness. However, when the number of light-emitting components is large, the component cost will increase, resulting in a product that does not have a cost advantage.

Therefore, it is necessary to propose a new luminous keyboard design that can reduce the overall thickness, effectively streamline components to reduce power consumption and component costs, improve the luminous brightness of the keyboard, and evenly distribute the light source.

In view of this, the present invention proposes a luminous keyboard and a backlight module. Compared with the previous technology, the luminous keyboard and backlight module of the present invention have a thinner thickness, improved brightness and more uniform optical coupling through innovative structure and circuit design and control methods, so they can reduce power and power consumption, and achieve Thin effect.

To achieve the above object, the present invention provides a luminous keyboard including a first keycap group, a second keycap group, and a backlight module. The first keycap group and the second keycap group respectively have a plurality of keycaps. The backlight module has a first light-emitting unit, a second light-emitting unit, a first resistor, a second resistor, a light guide plate and a circuit board. The first light-emitting unit has a plurality of light-emitting elements, each light-emitting element is disposed correspondingly under each keycap of the first keycap group, and the light-emitting elements in the first light-emitting unit are electrically connected in parallel with each other; the second light-emitting unit has a plurality of light-emitting elements, Each light-emitting element is disposed correspondingly under each keycap of the second keycap group, and the light-emitting elements in the second light-emitting unit are electrically connected in parallel with each other. The first resistor is electrically connected in series with the first light-emitting unit, and the second resistor is electrically connected in series with the second light-emitting unit; the light guide plate is provided with a plurality of through holes; the circuit board is arranged under the light guide plate, the first light-emitting unit, the second light-emitting unit, The first resistor and the second resistor are arranged on the circuit board. Wherein, a sum of first luminous areas of the keycaps of the first keycap group is not equal to a sum of second luminous areas of the keycaps of the second keycap group.

In one embodiment, when the sum of the first light-emitting areas is less than the sum of the second light-emitting areas, a first current flowing through the light-emitting elements in the first light-emitting unit is greater than a first current flowing through the light-emitting elements in the second light-emitting unit. a second current.

In one embodiment, when the sum of the first luminous areas is smaller than the sum of the second luminous areas, the resistance of the first resistor is smaller than the resistance of the second resistor.

In one embodiment, when the sum of the first light-emitting areas is less than the sum of the second light-emitting areas, the average light-emitting brightness of each light-emitting element of the first light-emitting unit is greater than the average light-emitting brightness of each light-emitting element of the second light-emitting unit.

In one embodiment, the number of the light-emitting elements of the first light-emitting unit or the second light-emitting unit is greater than the number of resistors connected in series with the light-emitting elements.

In one embodiment, each light-emitting element has a plurality of light-emitting surfaces perpendicular to the light-emitting surfaces of the keycaps.

In one embodiment, the light-emitting surfaces include a first light-emitting surface, and the normal direction of the first light-emitting surface forms an acute angle with the side of the corresponding keycap, and the acute angle ranges from 35 degrees to 60 degrees.

In one embodiment, the luminous keyboard further has a base plate, which is disposed under the first keycap group and the second keycap group. The base plate is provided with a plurality of openings corresponding to the keycaps and the light-emitting elements respectively. The through holes are respectively corresponding to the keycaps and the light-emitting elements. There should be some openings. And the backlight module further has a light-shielding film, which includes a planar area and a plurality of convex areas. The planar area is arranged between the base plate and the light guide plate, and each convex area corresponds to each opening. Each light-emitting element in the first light-emitting unit and the second light-emitting unit is accommodated in an accommodation space formed by each opening, each through hole, and each raised area.

In one embodiment, a reflective portion is provided between the light-emitting element and the protruding area, and the reflective portion is only provided in the area above the light-emitting element to reflect the light emitted by the light-emitting element.

In one embodiment, the circuit board has a reflective layer and a light guide plate, which reflects part of the light emitted by each light-emitting element to the light guide plate, and the reflective layer is exposed in the through hole.

Furthermore, the present invention provides a backlight module having a light guide plate, a first light-emitting unit, a second light-emitting unit, a first resistor, a second resistor, a circuit board, and a light-shielding sheet. The light guide plate includes one side, a first backlight area and a second backlight area. The first backlight area and the second backlight area respectively have a plurality of keycap backlight areas, and each keycap backlight area is provided with a through hole. The first light-emitting unit has a plurality of light-emitting elements. Each light-emitting element is arranged corresponding to each through hole in each keycap backlight area of the first backlight area. The light-emitting elements in the first light-emitting unit are electrically connected in parallel with each other; the second light-emitting unit There are a plurality of light-emitting elements, each light-emitting element is arranged corresponding to each through hole in each keycap backlight area of the second backlight area, and the light-emitting elements in the second light-emitting unit are electrically connected in parallel with each other. The first resistor is electrically connected in series with the first light-emitting unit, and the second resistor is electrically connected in series with the second light-emitting unit. The circuit board is disposed under the light guide plate, and the first light-emitting unit, the second light-emitting unit, the first resistor and the second resistor are disposed on the circuit board. The light-shielding sheet includes a planar area and a plurality of convex areas. The planar area is provided with a plurality of openings to emit light, and each light-emitting element is arranged corresponding to each convex area. Wherein, a first area sum of the openings in the keycap backlight areas corresponding to the first backlight area and a second area corresponding to the openings in the keycap backlight areas of the second backlight area The sums are not equal.

In one embodiment, each light-emitting element has a plurality of light-emitting surfaces perpendicular to the upper surface of the light guide plate.

In one embodiment, each light-emitting element in the first light-emitting unit and the second light-emitting unit protrudes from each through hole and is accommodated in an accommodation space formed by each through hole and each raised area.

The following will describe the preferred embodiments of the luminous keyboard and backlight module according to the present invention with reference to the relevant drawings, in which the same components will be described with the same reference symbols.

Referring to FIG. 1 , the luminous keyboard 100 includes a keyboard assembly 10 , a base plate 1 and a backlight module 20 .

Referring to FIGS. 2 and 3 , FIG. 2 is a schematic top view of the luminous keyboard according to one embodiment of the present invention, and FIG. 3 is a partial enlarged view of the luminous keyboard according to one embodiment of the present invention. Viewed from above the self-luminous keyboard 100, the keyboard assembly 10 includes a plurality of keycaps 13 of different sizes, such as function keys (F1~F12), numeric keys, letter keys, input keys, etc. According to an embodiment, the keyboard assembly 10 is divided into a plurality of keycap groups 11a to 11f, including a first keycap group 11a and a second keycap group 11b. The first keycap group 11 a includes a function key area, and the second key cap group 11 b includes an alphabetic key area. The first key cap group 11 a and the second key cap group 11 b each have a plurality of key caps 13 . The top surface 13a of each keycap 13 is marked with a symbol annotation corresponding to the character or function of the keycap. The symbol annotation can be any symbol required for the keyboard function, such as but not limited to English characters, numbers, special symbols, or various Input method codes, etc. The symbol mark on the keycap 13 is designed as a semi-transparent character light-emitting area 131, so the light emitted by the backlight module 20 can be transmitted through the character light-emitting area 131 to make the keycap 13 emit light for the user to view and identify.

Taking one of the keycaps shown in Figure 3 as an example, and following the central section line A-A, with reference to Figures 4 and 5, the structure of the luminous keyboard of the present invention will be continued to be described.

An elastic component 16 is provided under each keycap 13 to support the keycap 13 . A bottom plate 1 is provided below the keyboard assembly 10. The bottom plate 1 is located between the keyboard assembly 10 and the backlight module 20. The bottom plate 1 is made of various metals such as but not limited to iron, stainless steel, nickel, copper, or resin, plastic, rubber and other materials. The base plate 1 can be designed to be light-transmitting or opaque. The base plate 1 is provided with a plurality of openings 18a corresponding to the character light-emitting areas 131 of each keycap 13, and is provided with a plurality of openings 18b corresponding to the positions of the light-emitting elements 3 of each keycap 13. The opening 18b is approximately located in the center of the keycap 13. Below, the light-emitting element 3 can be accommodated. The openings 18a and 18b may be round holes, but may also be square, polygonal or other shapes.

The backlight module 20 is located below the keyboard assembly 10 and the base plate 1 , and includes a light-shielding sheet 2 , a light guide plate 4 , a plurality of light-emitting elements 3 and a circuit board 5 . The backlight module 20 is divided into multiple light-emitting units, and each light-emitting unit has multiple light-emitting elements 3 . In this embodiment, one keycap 13 corresponds to one light-emitting element 3 respectively.

The light-shielding sheet 2 includes a planar area 21 and a plurality of convex areas 22 . The plane area 21 is provided between the base plate 1 and the light guide plate 4 , and an opening 212 is provided at a position corresponding to the character light-emitting area 131 of each keycap 13 , so that light can pass through the opening 212 and be incident on the character light-emitting area 131 of each keycap 13 . light source. Each raised area 22 is opaque and blocks light. The position corresponding to the opening 18b is arranged above each light-emitting element 3 to accommodate each light-emitting element 3 . The light emitted from the upper light-emitting surface 3a of the light-emitting element 3 can be reflected by the convex area 22 of the light-shielding sheet 2, enter the light guide plate 4, and then emit light through the opening 212. The light-shielding sheet 2 has the properties of blocking light and reflecting light.

Refer to FIG. 6 , which is a schematic top view of a keycap according to an embodiment of the present invention. Starting from the keycap 13 downward, the first layer is the bottom plate 1. The bottom plate 1 has a circular opening 18b in the center just below the keycap 13, and multiple openings 18a around it. The second layer below is the light-shielding sheet 2. The light-shielding sheet 2 is turned at an angle at the opening 18b to form a raised area 22, and the rest is a flat area 21. The flat area 21 is provided with an opening 212 to emit light. In addition, a light guide plate 4 is provided under the light shielding sheet 2 . The light guide plate 4 is provided with a through hole 48 under the raised area 22, and the through hole 48 accommodates the light emitting element 3 (not shown in the figure). The light guide plate 4 is provided with a light guide pattern 45 at the corresponding opening 212 to facilitate light guide. That is to say, referring to Figures 5 and 6 together, the approximate center position of the keycap 13 corresponds from the keycap 13 downward to the opening 18b of the base plate 1, the raised area 22 of the light shielding sheet 2, and the light-emitting element 3, and the surrounding area is They are the bottom plate 1 or the opening 18a, the planar area 21 and the opening 212 of the light shielding sheet 2, and the light guide plate 4 is arranged underneath. As the size of each keycap 13 is different and the required light source design is different, the size of the character light-emitting area 131 is also different, and the size of the corresponding opening 212 is also different. The position and area of the opening 212 can be adjusted according to needs.

In this embodiment, the light-emitting element 3 can be a rectangular or square light-emitting diode element with multiple light-emitting surfaces. Referring to Figures 4, 5 and 7, the light-emitting element 3 is a cube with six sides: a first light-emitting surface 31, a second light-emitting surface 32, a third light-emitting surface 33, a fourth light-emitting surface 34, an upper light-emitting surface 3a, and a bottom surface 3b. , the first light-emitting surface 31, the second light-emitting surface 32, the third light-emitting surface 33, and the fourth light-emitting surface 34 are perpendicular to the upper light-emitting surface 3a and/or the bottom surface 3b.

Referring to FIG. 7 , the light-emitting surface 3 a of the light-emitting element 3 faces the top surface 13 a of the keycap 13 , and the first light-emitting surface 31 , the second light-emitting surface 32 , the third light-emitting surface 33 , and the fourth light-emitting surface 34 are perpendicular to the keycap 13 . The top surface 13a is installed below the keycap 13. According to an embodiment, when the light-emitting element 3 is installed below the keycap 13, it is rotated at an angle θ, so that the light emitted by the four light-emitting surfaces 31-34 of the light-emitting element 3 can better expand to the four corners of the keycap 13, thus obtaining Better luminous efficiency and uniform luminous effect, the transposition angle θ is about 30 to 60 degrees. Preferably, the transposition angle θ is approximately 30 to 55 degrees. Moreover, one of the light-emitting surfaces of the light-emitting element 3, such as the normal direction of the first light-emitting surface 31, forms an acute angle θ1 with the side 13S of the keycap 13 or the side 4S of the light guide plate 4 corresponding to the light-emitting element 3. The angle θ and the acute angle θ1 are complementary to each other (the sum is 90 degrees), so the acute angle θ1 is about 30 to 60 degrees. Preferably, the acute angle θ1 is about 35 to 60 degrees.

In one embodiment, a reflective part 37 is provided between the light-emitting element 3 and the raised area 22 , and the reflective part 37 is only provided in the area above the light-emitting element 3 . The reflective portion 37 is attached to the upper light-emitting surface 3 a of the light-emitting element 3 to reflect the light emitted by the light-emitting element 3 and guide the light into the light guide plate 4 . The reflective part 37 can be white or other colors that are good for reflection. The reflective part 37 can be independently provided, or can be integrally formed with the light-emitting element 3, so that the light can be reflected back and forth in the light-emitting element 3, and the light emitted from the upper light-emitting surface 3a can be collected to the surroundings and passed through the surrounding light-emitting surfaces 31-34. The light is incident on the light guide plate 4, thereby increasing the amount of light entering the light guide plate 4.

The light guide plate 4 is a sheet material with a thickness and a transverse side 4S. The light guide plate 4 is divided into a plurality of backlight areas 14a-14f respectively corresponding to the keycap groups 11a-11f, including a first backlight area 14a and a second backlight area 14b. Each backlight area has a plurality of keycap backlight areas. The backlight area is roughly located under the vertical projection range of each keycap 13 . The first backlight area 14a has a plurality of keycap backlight areas 141a; the second backlight area 14b has a plurality of keycap backlight areas 141b. A through hole 48 is opened in the backlight area of each keycap corresponding to the light-emitting element 3 to accommodate each light-emitting element 3 . Each light-emitting element 3 protrudes from the through hole 48 and is accommodated in the accommodation space formed by the opening 18 b of the base plate 1 , the through hole 48 of the light guide plate 4 and the raised area 22 of the light shielding sheet 2 . The shape of the through hole 48 can be rectangular, square, circular, polygonal, irregular, etc., so that the light emitted from the multiple light exit surfaces 31 to 34 of the light emitting element 3 can enter the multiple light incident surfaces around the through hole 48 to achieve a suitable Mixed light effect. After the light emitted by the light-emitting element 3 enters the light guide plate 4, it will be transmitted through total reflection in the light guide plate 4. When it hits the light guide pattern 45, it will be reflected and emit light through the opening 212. The first light-emitting surface 31 , the second light-emitting surface 32 , the third light-emitting surface 33 and the fourth light-emitting surface 34 are perpendicular to the upper surface 4 a of the light guide plate 4 .

The circuit board 5 is disposed below the light guide plate 4 and has a first plane 5a facing the light guide plate 4 and a second plane 5b facing away from the light guide plate 4 . According to an embodiment, the first plane 5 a is coated with a reflective layer 51 , which serves as a reflective and light-shielding material and can reflect part of the light emitted by the light-emitting element 3 to the light guide plate 4 . The through hole 48 of the light guide plate 4 is larger than the size of the light emitting element 3 , and the reflective layer 51 can be exposed through the through hole 48 of the light guide plate 4 . The light-emitting element 3 can be close to or immediately adjacent to the reflective layer 51, so that the light is directly reflected on the reflective layer 51, thereby improving the light utilization efficiency. The reflective layer 51 can be white, or other colors that are good for reflection. The reflective layer 51 and the circuit board 5 can be integrally formed to make the light incident area smoother, thereby reducing the loss when light enters and improving the optimal utilization of the amount of incident light. The circuit board 5 may be, but is not limited to, a flexible circuit board (FPC).

Referring to Figure 8, the series-parallel circuit design of this luminous keyboard is explained. The circuit on the circuit board 5 is composed of multiple light-emitting circuit blocks L1, L2...Ln electrically connected in parallel, and each light-emitting circuit block L1, L2...Ln corresponds to each key of the light-emitting keyboard 100. The cap groups 11a to 11f are, for example, the first keycap group 11a, the second keycap group 11b, etc.

Each light-emitting circuit block L1, L2...Ln is composed of at least one resistor and a plurality of light-emitting elements 3, and is connected to the controller F. A plurality of light-emitting elements 3 are electrically connected in parallel with each other to form each light-emitting unit, and are then connected in series with resistors to facilitate control of each block. In each light-emitting unit, since multiple light-emitting elements 3 are connected in parallel and in series with resistors in a partitioned manner, the number N of light-emitting elements 3 in the light-emitting unit is not equal to the number n of resistors connected in series in the light-emitting unit. The number N of 3 is greater than the number n of resistors connected in series with the light-emitting unit.

The resistor may be a variable resistor or an equivalent resistance formed by multiple resistors. The zoning method of the light-emitting circuit blocks L1, L2...Ln can refer to the keycap light-emitting area required to be illuminated by each corresponding light-emitting unit, such as keycap groups including function keys, back keys, letter keys, etc. with different keycap sizes. , and through the partition method, the brightness performance of different areas is controlled. In the first light-emitting circuit block L1, the first resistor R1 is connected in series with the first light-emitting unit 15a. In the second light-emitting circuit block L2, the second resistor R2 is connected in series with the second light-emitting unit 15b. The first light-emitting unit 15a, the second light-emitting unit 15b, the first resistor R1, and the second resistor R2 are arranged on the circuit board 5.

According to an embodiment, the first light-emitting unit 15a corresponds to the first keycap group 11a, and the second light-emitting unit 15b corresponds to the second keycap group 11b as the light source. Since the first keycap group 11a includes a functional key area with a smaller top surface 13a of the keycaps and a smaller total area of the character light-emitting areas 131, the second keycap group 11b includes a larger keycap top surface 13a with a smaller area. The total area of the character light-emitting area 131 is also larger than that of the character keypad. Therefore, the first light-emitting unit 15a requires a larger current than the second light-emitting unit 15b, so that the light-emitting element 311 of the first light-emitting unit 15a can generate a larger current than the second light-emitting unit 15b. The light-emitting element 312 of the light-emitting unit 15b has a large light-emitting power to balance the light-emitting brightness, making the overall vision more balanced. In this way, the best uniformity of overall light emission can also be achieved while reducing component costs. In addition, the number of light-emitting elements 3 in each light-emitting unit can be changed according to the requirements of different partitioning methods and design changes.

In addition, assuming that the area of the character light-emitting area 131 of the keycap 13 in each keycap group is the light-emitting area of each keycap 13, then the light-emitting area of the first keycap group 11a corresponding to the first light-emitting unit 15a is the first The sum of the light-emitting areas of each keycap 13 in the keycap group 11a is set as the first total light-emitting area A1; the light-emitting area of the second keycap group 11b corresponding to the second light-emitting unit 15b is the total light-emitting area of each keycap group 11b in the second keycap group 11b. The total of the light-emitting areas of the keycaps 13 is assumed to be the second total light-emitting area A2. The sum of the first light-emitting areas A1 is not equal to the sum of the second light-emitting areas A2. Furthermore, the sum of the first luminous areas A1 is smaller than the sum of the second luminous areas A2.

In addition, the first backlight area 14a corresponding to the first keycap group 11a has a plurality of keycap backlight areas 141a, and each keycap backlight area 141a emits light through the corresponding openings 212. The second backlight area 14b corresponding to the second keycap group 11b has a plurality of keycap backlight areas 141b, and each keycap backlight area 141b emits light through the corresponding openings 212. The larger the area of the top surface 13a of each keycap 13 is, the larger the area of the opening 212 corresponding to each keycap 13 is, and the two are proportional to each other.

Therefore, the total area of the openings 212 of the keycap backlight area 141a corresponding to the first backlight area 14a is set to the first area sum A01, and the total area of the openings 212 of the keycap backlight area 141b corresponding to the second backlight area 14b is set to When the second area sum A02 is the first area sum A01 and the second area sum A02, the first area sum A01 is not equal to the second area sum A02. Furthermore, the first area sum A01 is smaller than the second area sum A02. Similarly, since the first total area A01 of the first backlight area 14a is smaller than the second total area A02 of the second backlight area 14b, the first light-emitting unit 15a requires a larger current than the second light-emitting unit 15b, so that the first light-emitting unit 15a needs a larger current than the second light-emitting unit 15b. The light-emitting element 311 of the light-emitting unit 15a generates greater light-emitting power than the light-emitting element 312 of the second light-emitting unit 15b to balance the light-emitting brightness and make the overall vision more balanced.

According to an embodiment, the size of the resistor connected in series with the light-emitting unit can be adjusted to control the current. When the sum of the first luminous areas A1 of the first keycap group 11a is smaller than the sum of the second luminous areas A2 of the second keycap group 11b, or the sum of the first areas A01 corresponding to the first backlight area 14a is smaller than the sum of the first luminous areas A01 corresponding to the second backlight area When the second area sum A02 of 14b is set, the resistance value of the first resistor R1 is set to be smaller than the resistance value of the second resistor R2, so that the first current I1 flowing through the light-emitting element 311 of the first light-emitting unit 15a is greater than the resistance value flowing through the second resistor R2. The second current I2 of the light-emitting element 312 of the light-emitting unit 15b causes the average brightness of the light-emitting element 311 of the first light-emitting unit 15a to be greater than the average brightness of the light-emitting element 312 flowing through the second light-emitting unit 15b. In addition, since the longer the distance between the circuit board line and the power supply (not shown in the figure), the current will become smaller due to the line impedance loss. Therefore, series resistors with different resistance values can be used accordingly, and the resistance value design can be adjusted to adjust the resistance of each area. current size.

In summary, according to some embodiments, the luminous keyboard 100 accommodates the luminous element 3 in the accommodation space formed by the opening 18b of the base plate 1, the through hole 48 of the light guide plate 4, and the raised area 22 of the light shielding sheet 2. The overall thickness is reduced, and different circuit blocks are distinguished according to the different light-emitting areas of different keycap groups to streamline components. The luminous keyboard and backlight module of the present invention have a thinner thickness, improved brightness, and more uniform optical coupling through innovative structure and circuit design and control methods. Therefore, power and power consumption can be reduced, and the effect of thinning can be achieved.

100: Illuminated keyboard 10:Keyboard components 11a: First keycap group 11b: Second keycap group 11c~11f: keycap set 13:Keycap 13a:Top surface 13S: Side 131:Character light-emitting area 14a: First backlight area 14b: Second backlight area 14c~14f: backlight area 141a,141b: Keycap backlight area 15a: First light emitting unit 15b: Second light-emitting unit 16: Elastic component 1: Bottom plate 18a,18b: opening 20:Backlight module 2: shading film 21: Plane area 212:Open your mouth 22: Raised area 3,311,312:Light-emitting element 3a: Glossy surface 3b: Bottom surface 31:The first shining surface 32: The second shining surface 33:The third shining surface 34:The fourth shining surface 37: Reflective part 4:Light guide plate 4S: side 4a: Upper surface 45:Light guide pattern 48:Through hole 5:Circuit board 5a: First plane 5b: Second plane 51: Reflective layer R1: first resistor R2: second resistor I1: first current I2: second current A1, A2: total luminous area A01,A02: total area L1~Ln: light-emitting circuit block θ: angle θ1: acute angle F:Controller A-A: hatch line

Figure 1 is a schematic diagram of a luminous keyboard according to an embodiment of the present invention. FIG. 2 is a schematic top view of a light-emitting keyboard according to an embodiment of the present invention. FIG. 3 is a partial enlarged view of the luminous keyboard according to an embodiment of the present invention. Figure 4 is a partial cross-sectional schematic diagram of a light-emitting keyboard according to an embodiment of the present invention. Figure 5 is a partial cross-sectional schematic diagram of a light-emitting keyboard according to an embodiment of the present invention. FIG. 6 is a schematic top view of a keycap according to an embodiment of the present invention. FIG. 7 is an angular view of a light-emitting element according to an embodiment of the present invention. FIG. 8 is a schematic diagram of a series-parallel circuit of a backlight module according to an embodiment of the present invention.

100: Illuminated keyboard

10:Keyboard components

13:Keycap

13a:Top surface

16: Elastic component

1: Bottom plate

18b: opening

20:Backlight module

2: shading film

21: Plane area

22: Raised area

3:Light-emitting components

3a: Glossy surface

3b: Bottom surface

37: Reflective part

4:Light guide plate

48:Through hole

5:Circuit board

Claims (10)

A backlight module for a luminous keyboard, including: A light guide plate includes one side, a first backlight area and a second backlight area. The first backlight area and the second backlight area respectively have a plurality of keycap backlight areas, wherein each keycap backlight area is provided with a consistent hole; A first light-emitting unit has a plurality of light-emitting elements. Each light-emitting element of the first light-emitting unit is arranged corresponding to each through hole in each keycap backlight area of the first backlight area. The first light-emitting unit has a plurality of light-emitting elements. The light-emitting elements are electrically connected in parallel with each other; A second light-emitting unit has a plurality of light-emitting elements. Each light-emitting element of the second light-emitting unit is arranged corresponding to each through hole in each keycap backlight area of the second backlight area. The second light-emitting unit has a plurality of light-emitting elements. The light-emitting elements are electrically connected in parallel with each other; a first resistor electrically connected in series with the first light-emitting unit; a second resistor electrically connected in series with the second light-emitting unit; A circuit board is provided below the light guide plate, and the first light-emitting unit, the second light-emitting unit, the first resistor and the second resistor are provided on the circuit board; and A light-shielding sheet includes a planar area and a plurality of convex areas. The planar area is provided with a plurality of openings to emit light, and each light-emitting element is provided corresponding to each of the convex areas; Wherein, a first area sum of the openings in the keycap backlight areas corresponding to the first backlight area is equal to a first area sum of the openings in the keycap backlight areas corresponding to the second backlight area. The sum of the two areas is not equal. The backlight module of claim 1, wherein when the first total area is less than the second total area, a first current flowing through the light-emitting elements in the first light-emitting unit is greater than flowing through the second light-emitting unit. A second current for the light-emitting elements in the unit. The backlight module of claim 1, wherein when the first sum of areas is smaller than the second sum of areas, the resistance of the first resistor is smaller than the resistance of the second resistor. The backlight module of claim 1, wherein when the first total area is less than the second total area, the average luminous brightness of each light-emitting element of the first light-emitting unit is greater than that of each light-emitting element of the second light-emitting unit. average luminous brightness. The backlight module of claim 1, wherein the number of the light-emitting elements of the first light-emitting unit or the second light-emitting unit is greater than the number of resistors connected in series with the light-emitting elements. The backlight module of claim 1, wherein each of the light-emitting elements has a plurality of light-emitting surfaces perpendicular to the upper surface of the light guide plate. The backlight module of claim 6, wherein the light-emitting surfaces include a first light-emitting surface, and the normal direction of the first light-emitting surface forms an acute angle with the side, and the acute angle ranges from 35 degrees to 60 degrees. The backlight module of claim 1, wherein a reflective part is provided between the light-emitting element and the raised area, and the reflective part is only provided in the area above the light-emitting element to reflect the light emitted by the light-emitting element. The backlight module of claim 1, wherein each of the light-emitting elements in the first light-emitting unit and the second light-emitting unit protrudes from each of the through holes and is accommodated between each of the through holes and each of the protrusions. in the accommodation space formed by the starting area. The backlight module of claim 1, wherein the circuit board has a reflective layer facing the light guide plate to reflect part of the light emitted by each light-emitting element to the light guide plate, and the reflective layer is exposed in the through hole.