JP2008009039A - Electrooptical device and electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrooptical device in which a display grade can be improved by reducing a cross talk. <P>SOLUTION: The electrooptical device is an image display device of a parallax barrier system capable of performing a two-screen display or stereoscopic image display, and includes a display panel, a parallax barrier, and a controller. The display panel has a plurality of data lines, a plurality of scanning lines, and pixel electrodes disposed at the intersections of the plurality of the data lines, and the plurality of the scanning lines. The controller performs correction to the potential applied to the prescribed pixel electrodes with the amount of correction determined on the basis of the potential applied to the prescribed pixel electrodes and the potential applied to the adjacent pixel electrodes. By doing in this way, the electrooptical device can correct the potentials applied to the pixel electrodes of respective sub-pixels with the respectively appropriate amounts of correction and, on the other hand, can reduce the influence of the cross talk due to the displaying of the other image with respect to the one image. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electro-optical device and an electronic apparatus suitable for use in displaying various types of information.

  As examples of the electro-optical device, a two-screen display device that presents different images to observers located at different observation positions and a three-dimensional image display device that displays a three-dimensional stereoscopic image are known. One type of such a display device is a parallax barrier (parallax barrier) type image display device. This image display device includes, for example, a liquid crystal display panel and a parallax barrier provided on the viewer side of the display surface of the liquid crystal display panel. Slits are arranged at predetermined positions of the parallax barrier so as to correspond to pixel electrodes adjacent to each other. For example, when providing different images to observers with different observation positions, only one image is incident on one observer and only the other image is incident on the other observer. An opening of the parallax barrier is formed. In addition, when providing a three-dimensional stereoscopic image to the observer, the opening of the parallax barrier is set so that the image for the left eye is incident on the left eye of the observer and the image for the right eye is incident on the right eye of the observer. The part is formed.

  However, a problem that adversely affects the above-described parallax barrier image display apparatus is the occurrence of crosstalk. Crosstalk means that light from one image leaks into one image due to various factors. For example, in the case of providing different images to observers at different observation positions, crosstalk occurs, so that only one image is incident on one observer, but the other image is not incident. Will also be incident. Further, when providing a three-dimensional stereoscopic image to an observer, crosstalk occurs, so that only the image for the left eye does not enter the left eye of the observer, but one image for the right eye. On the other hand, not only the image for the right eye but also a part of the image for the left eye enter the right eye of the observer.

  In Patent Document 1, crosstalk is achieved by raising the background gray level for the input RGB color vector for each pixel based on the amount of crosstalk correction determined by experimental measurement of the display. A technique for reducing the above is described.

JP 2004-31780 A

  An object of the present invention is to reduce crosstalk and improve display quality in an electro-optical device such as a parallax barrier image display device capable of performing, for example, two-screen display or stereoscopic image display.

  In one aspect of the present invention, an electro-optical device includes a plurality of data lines, a plurality of scanning lines, and a pixel electrode provided corresponding to an intersection of the plurality of data lines and the plurality of scanning lines. A parallax barrier disposed on the surface of the display panel and having a slit disposed between the pixel electrodes adjacent to each other, a data signal supplied to the plurality of data lines, and the plurality of scanning lines And a control unit that controls the magnitude of the potential applied to the pixel electrode by controlling the scanning signal supplied to the pixel electrode, and the control unit is configured to display a predetermined image when displaying the image. A correction amount is obtained based on the potential applied to the pixel electrode and the potential applied to the pixel electrode adjacent to the predetermined pixel electrode along the scanning line, and the potential applied to the predetermined pixel electrode is: The adjacent pixel electrode When the potential is smaller than the applied potential, a correction is performed in advance by adding the correction amount to the potential applied to the predetermined pixel electrode, and the potential applied to the predetermined pixel electrode is When the potential is higher than the potential applied to the pixel electrode, correction is performed to subtract the correction amount in advance from the potential applied to the predetermined pixel electrode.

  The electro-optical device is a parallax barrier image display device capable of performing two-screen display or stereoscopic image display, and includes a display panel, a parallax barrier, and a control unit. The display panel is, for example, a liquid crystal display panel, and includes a plurality of data lines, a plurality of scanning lines, and pixel electrodes provided corresponding to intersections of the plurality of data lines and the plurality of scanning lines. In the parallax barrier, slits are disposed between the pixel electrodes adjacent to each other. The control unit controls the magnitude of the potential applied to the pixel electrode by controlling a data signal supplied to the plurality of data lines and a scanning signal supplied to the plurality of scanning lines, respectively, and displays an image. .

  The control unit obtains a correction amount based on a potential applied to a predetermined pixel electrode and a potential applied to a pixel electrode adjacent to the predetermined pixel electrode along the scanning line when displaying an image. When the potential applied to the predetermined pixel electrode is smaller than the potential applied to the adjacent pixel electrode, the correction amount is added in advance to the potential applied to the predetermined pixel electrode. When the potential applied to the predetermined pixel electrode is larger than the potential applied to the adjacent pixel electrode, the correction is performed on the potential applied to the predetermined pixel electrode. A correction for subtracting the amount in advance is performed. By doing so, the electro-optical device corrects the potential applied to the pixel electrode of each sub-pixel with an appropriate correction amount when displaying two different images on one screen. It is possible to reduce the influence of crosstalk caused by displaying the other image with respect to one image.

  In one aspect of the electro-optical device, the control unit may apply a high gradation or low gradation potential to the predetermined pixel electrode and apply a halftone potential to the adjacent pixel electrode. In this case, the correction amount is maximized. As a result, the electro-optical device can appropriately correct even a sub-pixel in which the potential fluctuation of the pixel electrode due to the influence of crosstalk is large.

  In another aspect of the present invention, an electronic apparatus including the above-described electro-optical device in a display portion can be configured.

  In still another aspect of the present invention, a display panel having a plurality of data lines, a plurality of scanning lines, and a pixel electrode provided corresponding to an intersection of the plurality of data lines and the plurality of scanning lines, A parallax barrier disposed on the surface of the display panel and correspondingly disposed between the pixel electrodes adjacent to each other, a data signal supplied to the plurality of data lines, and a plurality of scanning lines. A control unit that displays an image by controlling a magnitude of a potential applied to the pixel electrode by controlling a scanning signal, and the control unit displays an image. The correction amount is obtained based on the potential applied to the predetermined pixel electrode and the potential applied to the pixel electrode adjacent to the predetermined pixel electrode along the scanning line, and applied to the predetermined pixel electrode. The potential to be When the potential is smaller than the potential applied to the pixel electrode in contact, the potential applied to the predetermined pixel electrode is corrected by adding the correction amount in advance, and the potential applied to the predetermined pixel electrode However, when the potential is higher than the potential applied to the adjacent pixel electrode, correction is performed to subtract the correction amount in advance from the potential applied to the predetermined pixel electrode. Even with this method, the potential applied to the pixel electrode of each sub-pixel can be corrected with an appropriate correction amount, and the influence of crosstalk caused by displaying the other image on one image can be reduced. can do.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the drawings.

[Image display device]
FIG. 1 is a cross-sectional view of an image display apparatus 100 according to the present embodiment. The image display device 100 according to the present embodiment is a parallax barrier image display device, and can perform, for example, two-screen display for displaying different images to a plurality of observers positioned at different observation positions. The image display apparatus 100 according to the present embodiment is the same as the conventional parallax barrier image display apparatus in terms of the apparatus configuration.

  As shown in FIG. 1, the image display device 100 according to the present embodiment is mainly composed of a parallax barrier 9, a liquid crystal display panel 20, and a lighting device 10.

  The liquid crystal display panel 20 has a structure in which substrates 1 and 2 are bonded to each other with a sealant 3 between them, and a liquid crystal 4 is sealed between the substrates 1 and 2. A pixel electrode 5 is formed on each inner surface of the substrate 1 for each sub-pixel SGa, SGb of one dot. On the inner surface of the substrate 2, a colored layer 6 and a counter electrode 7 for each color of RGB as a color filter are formed. Is formed. The colored layers 6 for each color of RGB are formed at positions corresponding to the pixel electrodes 5, and the counter electrode 7 is formed on the entire surface of the substrate 2.

  The lighting device 10 is installed on the back side of the liquid crystal display panel 20. The illumination device 10 illuminates the liquid crystal display panel 20 by transmitting light. A lower polarizing plate 12b is disposed between the liquid crystal display panel 20 and the lighting device 10.

  A parallax barrier 9 is disposed on the light emission surface side of the liquid crystal display panel 20. The parallax barrier 9 is a panel provided with slits 9S at a predetermined interval. In the parallax barrier 9, only the portion where the slit 9 </ b> S is provided functions as a transmission region that transmits light, and the other portion functions as a light shielding region that does not transmit light. The parallax barrier 9 has, for example, a configuration in which a liquid crystal is sandwiched between two substrates. By controlling the alignment of the liquid crystal, a transmissive region that functions as the slit 9S and a light-shielding region that does not transmit light. And form. The slits 9 </ b> S are correspondingly positioned between the adjacent colored layers 6 or pixel electrodes 5 in the liquid crystal display panel 20. An upper polarizing plate 12 a is disposed on the light exit surface side of the parallax barrier 9.

  Light emitted from the illumination device 10 enters the liquid crystal display panel 20, passes through the colored layer 6, and then exits from the liquid crystal display panel 20. The light emitted from the liquid crystal display panel 20 enters a plurality of observers 11a and 11b located at different observation positions through the slit 9S.

  In the image display device 100 shown in FIG. 1, the RGB colored layer 6 through which light incident on the observer 11a passes is shown as colored layers Rca, Gca, Bca, and the RGB colored layer through which light incident on the observer 11b passes. 6 is shown as a colored layer Rcb, Gcb, Bcb. Accordingly, the sub-pixels SGa having the colored layers Rca, Gca, and Bca of the respective colors indicate the RGB sub-pixels of the liquid crystal display panel 20 through which light incident on the observer 11a is transmitted, and the colored layers Rcb, Gcb of the respective colors. , Bcb sub-pixels SGb respectively indicate RGB sub-pixels of the liquid crystal display panel 20 through which light incident on the observer 11b is transmitted.

  For example, as indicated by a broken line, the light transmitted through the colored layer Gca enters the observer 11a by passing through a slit 9S positioned correspondingly between the colored layers Gca and Bcb. On the other hand, the light transmitted through the colored layer Bcb enters the observer 11b after passing through the slit 9S.

  Next, the configuration of the drive circuit of the liquid crystal display panel 20 will be described. FIG. 2 is a plan view of the liquid crystal display panel 20 in the image display apparatus 100 according to the present embodiment. The liquid crystal display panel 20 in the image display apparatus 100 shown in FIG. 1 is a cross-sectional view taken along a cutting line AA ′ in the plan view of the liquid crystal display panel 20 shown in FIG. It is. In FIG. 2, the vertical direction (column direction) of the paper surface is defined as the Y direction, and the horizontal direction (row direction) of the paper surface is defined as the X direction.

  A plurality of scanning lines 24 and a plurality of data lines 25 are arranged in a matrix on the inner surface of the substrate 1, and a TFT element (Thin Film Diode) or the like is provided at the intersection of each scanning line 24 and each data line 25. A switching element 26 is provided. The pixel electrode 5 is electrically connected to the switching element 26.

  Precisely, the substrate 1 has a region extending outward from the substrate 2 in the X direction and the Y direction. A scanning line driving circuit 21 is disposed on the inner surface of the region extending in the X direction of the substrate 1, and a data line driving circuit 22 is disposed on the inner surface of the region protruding in the Y direction of the substrate 1. Yes.

  Each data line 25 indicated by S1, S2, S3,..., Sn (n: natural number) extends in the Y direction and is arranged at a constant interval in the X direction. One end of each data line 25 is electrically connected to the data line driving circuit 22. Further, the data line driving circuit 22 is electrically connected to the FPC 23 via the wiring 32. The FPC 23 is electrically connected to an external electronic device, and the data line driving circuit 22 receives a control signal from the control unit 40 of the external electronic device via the FPC 23. The data line driving circuit 22 supplies a data signal to each data line 25 indicated by S1, S2, S3... Sn based on the control signal.

  Each scanning line 24 indicated by G1, G2, G3,..., Gm (m: natural number) extends in the X direction and is arranged at a constant interval in the Y direction. One end of each scanning line 24 is electrically connected to the scanning line driving circuit 21. The scanning line driving circuit 21 is electrically connected to the wiring 33, and the wiring 33 is electrically connected to an external electronic device. The scanning line driving circuit 21 receives a control signal from the control unit 40 of the external electronic device via the wiring 33. The scanning line driving circuit 21 sequentially supplies scanning signals to the scanning lines 24 indicated by G1, G2, G3... Gm based on the control signal.

  The counter electrode 7 is electrically connected to the data line driving circuit 22 via a wiring 34 indicated by COM. The data line drive circuit 22 drives the counter electrode 7 by supplying a drive signal via the wiring 34 based on a control signal from an external electronic device.

  The scanning line driving circuit 21 sequentially selects the scanning lines 24 in order of G1, G2, G3,..., Gm based on the control signal from the control unit 40, and the selected scanning lines 24 include Supply a scanning signal. Then, the data line driving circuit 22 applies a data signal corresponding to the display content to the pixel electrode 5 existing at the position corresponding to the selected scanning line 24 based on the control signal from the control unit 40. Supply via line 25. As a result, a potential is applied to the pixel electrode 5, and the alignment state of the liquid crystal molecules of the liquid crystal 4 between the pixel electrode 5 and the counter electrode 7 is switched to the non-display state or the intermediate display state. A desired image can be displayed. That is, the control unit 40 controls the scanning signals and data signals supplied to the plurality of scanning lines 24 and the plurality of data lines 25 by supplying control signals to the scanning line driving circuit 21 and the data line driving circuit 22. The desired image can be displayed on the liquid crystal display panel 20.

  The sub pixel SGa and the sub pixel SGb are alternately set in the X direction and the Y direction. Therefore, an image to be displayed on the observer 11a is displayed by switching the alignment state of the liquid crystal molecules of the liquid crystal 4 between the pixel electrode 5 and the counter electrode 7 in the sub-pixel SGa, and is displayed on the observer 11b. Is displayed by switching the alignment state of the liquid crystal molecules of the liquid crystal 4 between the pixel electrode 5 and the counter electrode 7 in the sub-pixel SGb.

(Composition of composite image)
Next, a composite image displayed by the image display device 100 according to the present embodiment will be described. FIG. 3 is a schematic diagram when a composite image C obtained by combining the image A and the image B is created. Here, the image A shows an image displayed on the observer 11a, and the image B shows an image displayed on the observer 11b. The composite image C is an image obtained by combining the image A and the image B, and is an image displayed on the display screen of the liquid crystal display panel 20 in the image display device 100 according to the present embodiment.

  The image A is an image in which the unit images Ra11 to Ba26 are combined. Here, the unit image indicates an image displayed in units of sub-pixels. The alphabetic parts Ra, Ga, and Ba in the unit image indicate that the image is displayed on each of the RGB sub-pixels SGa. That is, a unit image whose alphabetic part is indicated by Ra indicates an image displayed on one R subpixel SGa, and a unit image whose alphabetic part is indicated by Ga is displayed on one G subpixel SGa. A unit image that represents an image and whose alphabetic part is represented by Ba represents an image displayed on one sub-pixel SGa of B.

  The image B is an image in which the unit images Rb11 to Bb26 are combined. The alphabetic parts Rb, Gb, and Bb in the unit image indicate images that are displayed on the RGB sub-pixels SGb. That is, a unit image whose alphabetic part is indicated by Rb indicates an image displayed on one R subpixel SGb, and a unit image whose alphabetic part is indicated by Gb is displayed on one G subpixel SGb. A unit image indicating an image and whose alphabetic part is indicated by Bb indicates an image displayed on one B sub-pixel SGb.

  When creating the composite image C from the image A and the image B, the control unit 40 combines the unit image of the image A and the unit image of the image B so as to correspond to the sub pixel SGa and the sub pixel SGb, respectively. That is, as described above, the sub-pixel SGa and the sub-pixel SGb are alternately set in the X direction and the Y direction on the liquid crystal display panel 20, and therefore, the control unit 40 displays the image as shown in FIG. The unit image A and the unit image B are alternately synthesized corresponding to the sub-pixel SGa and the sub-pixel SGb.

  Specifically, when creating the composite image C from the images A and B, the control unit 40 uses unit images of a plurality of predetermined rows in the images A and B as unit images constituting the composite image C. Use. In the example illustrated in FIG. 3, it is assumed that the unit images Ra11 to Ba16 of the image A and the unit images Rb11 to Bb16 of the image B are used as unit images constituting the composite image C. The unit images in the rows other than the predetermined rows of the images A and B are not used as unit images constituting the composite image C. In the example illustrated in FIG. 3, it is assumed that the unit images Ra21 to Ba26 of the image A and the unit images Rb21 to Bb26 of the image B are not used as unit images constituting the composite image C.

  As can be seen from the composite image C shown in FIG. 3, the control unit 40 alternately arranges the unit images Ra11 to Ba16 of the image A and the unit images Rb11 to Bb16 of the image B corresponding to the subpixel SGa and the subpixel SGb. As a result, the synthesized image C is synthesized.

  The control unit 40 determines the potential to be applied to the pixel electrodes 5 of the sub-pixels SGa and SGb based on the gradation value of each unit image in the synthesized image C synthesized in this manner, and scan line driving as a control signal. This is supplied to the circuit 21 and the data line driving circuit 22.

  In this way, the composite image C shown in FIG. 3 is displayed on the liquid crystal display panel 20 of the image display device 100. On the composite image C shown in FIG. 3, the position of the slit 9S of the parallax barrier 9 is also indicated by a broken line. When viewing the composite image C through the slit 9S, the observer 11a can see only the unit images Ra11, Ga12, Ba13, Ra14, Ga15, and Ba16 and can recognize the image A. On the other hand, when viewing the composite image C through the slit 9S, the observer 11b can see only the unit images Rb11, Gb12, Bb13, Rb14, Gb15, and Bb16 through the slit 9S, and recognizes the image B. be able to.

(Crosstalk occurs)
FIG. 4 is a circuit diagram showing a part of the drive circuit of the image display apparatus 100. Specifically, FIG. 4 shows a drive circuit in a portion surrounded by a broken line P_area in FIG. In FIG. 4, subpixels SG1 and SG3 are subpixels of subpixel SGa, and subpixel SG2 is a subpixel of subpixel SGb.

  As described above, the scanning line driving circuit 21 sequentially and exclusively selects the scanning lines 24 in the order of G1, G2, G3,..., Gm based on the control signal from the control unit 40. A scanning signal is supplied to the selected scanning line 24. Then, the data line driving circuit 22 applies a data signal corresponding to the display content to each pixel electrode 5 existing at a position corresponding to the selected scanning line 24 based on the control signal from the control unit 40. Supply via line 25.

  At this time, a phenomenon occurs in which the potential of the pixel electrode 5 in a predetermined subpixel varies depending on the potential of the adjacent pixel electrode 5 along the direction in which the scanning signal flows.

  Specifically, for example, in FIG. 4, when the potential applied to the pixel electrode 5 of the sub-pixel SG1 is smaller than the potential applied to the pixel electrode 5 of the sub-pixel SG2, the pixel electrode 5 of the sub-pixel SG1 is applied. The applied potential drops. On the other hand, when the potential applied to the pixel electrode 5 of the sub-pixel SG1 is higher than the potential applied to the pixel electrode 5 of the sub-pixel SG2, the potential applied to the pixel electrode 5 of the sub-pixel SG1 rises.

  In FIG. 4, when the potential applied to the pixel electrode 5 of the sub-pixel SG2 is smaller than the potential applied to the pixel electrode 5 of the sub-pixel SG3, the potential applied to the pixel electrode 5 of the sub-pixel SG2 is descend. On the other hand, when the potential applied to the pixel electrode 5 of the sub-pixel SG2 is larger than the potential applied to the pixel electrode 5 of the sub-pixel SG3, the potential applied to the pixel electrode 5 of the sub-pixel SG2 rises.

  As described above, in the image display device 100, the potential of the pixel electrode 5 in a predetermined sub-pixel varies depending on the potential of the adjacent pixel electrode 5 along the direction in which the scanning signal flows. When providing different images, that is, only one image is displayed for one observer and only the other image is displayed for the other observer, one observation is performed. One person sees the other image in the displayed one image, and the other observer sees a crosstalk in which one image appears in the other displayed image.

  The influence on the image display due to the occurrence of the crosstalk will be described with reference to FIG. FIG. 5 is an enlarged view of the composite image C described above. In FIG. 5, potentials applied to the pixel electrodes 5 of the sub-pixels SGa and SGb when displaying each of the unit images Ra11 to Ba16 and Rb11 to Bb16 of the composite image C are Va11 to Va16 and Vb11 to Vb16. Each one is shown. In the example shown below, the influence of the occurrence of crosstalk in the composite image C when the image A is displayed in gray on one surface and the image B is displayed in red on the entire surface will be described. Here, it is assumed that the liquid crystal display panel 20 is a normally white liquid crystal display panel.

  Since the image A is displayed in gray on one side, the gradation values of the RGB unit images are all set to the same value. Therefore, in the example illustrated in FIG. 5, when the unit images Ra11, Ga12, Ba13, Ra14, Ga15, and Ba16 constituting the image A are displayed, the potentials Va11, Va12 applied to the pixel electrode 5 of each subpixel SGa are displayed. Assume that Va13, Va14, Va15, and Va16 are all set to the same potential V.

  Since the image B is displayed in red on one side, the gradation value of the R unit image is set larger than the gradation value of the GB unit image. Therefore, in the example shown in FIG. 5, when the unit images Rb11 and Rb14 among the unit images constituting the image B are displayed, the potentials Vb11 and Vb14 applied to the pixel electrode 5 of each sub-pixel SGb are the potential V When the unit images Gb12, Bb13, Gb15, Bb16 are displayed, the potentials Vb12, Vb13, Vb15, Vb16 applied to the pixel electrode 5 of each sub-pixel SGb are set higher than the potential V. Let's say.

  When the occurrence of crosstalk is not taken into consideration, by setting the potentials Va11 to Va16 as described above, the observer 11a can recognize the image A displayed in gray and sets the potentials Vb11 to Vb16. Thereby, the observer 11b can recognize the image B displayed in red.

  However, in consideration of the occurrence of the crosstalk described above, the potential of the pixel electrode 5 of the sub-pixel SGa that displays the unit image of the image A displays the unit image of the image B that is adjacent along the direction in which the scanning signal flows. It fluctuates depending on the potential of the pixel electrode 5 of the subpixel SGb. In addition, the potential of the pixel electrode 5 of the sub-pixel SGb that displays the unit image of the image B varies depending on the potential of the pixel electrode 5 of the sub-pixel SGa that displays the unit image of the adjacent image A along the direction in which the scanning signal flows. To do. Therefore, the image A is affected by crosstalk due to the display of the image B, and the image B is affected by crosstalk due to the display of the image A.

  As an example, the influence of the occurrence of crosstalk on the image A due to the display of the image B will be described with reference to FIG. FIG. 6 is an enlarged view of the same composite image C as in FIG. 5, but unlike FIG. 5, the pixel electrode of the sub-pixel SGa that displays each unit image of the image A that has changed due to the influence of the occurrence of crosstalk in the image B The potential after 5 fluctuations is shown surrounded by a broken line.

  When the occurrence of crosstalk due to the image B is not considered, as described above, when the image A is displayed in gray, the potentials Va11, Va12, Va13, Va14, Va15, and Va16 are shown in FIG. Thus, all are set to the same potential V.

  However, in FIG. 5, the potential Va11 (= V) of the pixel electrode 5 of the subpixel SGa that displays the unit image Ra11 is equal to the potential Vb12 (> V) of the pixel electrode 5 of the subpixel SGb that displays the adjacent unit image Gb12. Therefore, as shown in FIG. 6, the potential Va <b> 11 decreases due to the influence of the potential Vb <b> 12 and becomes smaller than the potential V during actual display.

  In FIG. 5, the potential Va12 (= V) of the pixel electrode 5 of the subpixel SGa displaying the unit image Ga12 is higher than the potential Vb13 (> V) of the pixel electrode 5 of the subpixel SGb displaying the adjacent unit image Bb13. Therefore, as shown in FIG. 6, the potential Va12 decreases due to the influence of the potential Vb13 and becomes smaller than the potential V during actual display.

  In FIG. 5, the potential Va13 (= V) of the pixel electrode 5 of the subpixel SGa that displays the unit image Ba13 is higher than the potential Vb14 (<V) of the pixel electrode 5 of the subpixel SGb that displays the adjacent unit image Rb14. Therefore, as shown in FIG. 6, the potential Va13 rises due to the influence of the potential Vb14 and becomes larger than the potential V during actual display.

  Similarly, during the actual display, the potential Va14 of the pixel electrode 5 of the subpixel SGa displaying the unit image Ra14 decreases and becomes smaller than the potential V due to the influence of the adjacent subpixel SGb. The potential Va15 of the pixel electrode 5 of the subpixel SGa to be displayed decreases and becomes lower than the potential V, and the potential Va16 of the pixel electrode 5 of the subpixel SGa that displays the unit image Ba16 increases and becomes higher than the potential V.

  In other words, when the image A is actually displayed, the potential of the RG pixel electrode is decreased and the potential of the B pixel electrode is increased. Therefore, in the normally white liquid crystal display panel 20, the image A has a high RG tone value and a low B tone value due to crosstalk due to the image B during actual display. Therefore, the image A that should have been displayed in gray is displayed in yellow due to the influence of the occurrence of crosstalk by displaying the image B.

  The influence of the occurrence of crosstalk on the image B by displaying the image A can also be considered in the same manner as described above.

  In FIG. 5, the potential Vb11 (<V) of the pixel electrode 5 of the subpixel SGb displaying the unit image Rb11 is higher than the potential Va12 (= V) of the pixel electrode 5 of the subpixel SGa displaying the adjacent unit image Ga12. Since it is low, the potential Vb11 decreases due to the influence of the potential Va12 during actual display.

  In FIG. 5, the potential Vb12 (> V) of the pixel electrode 5 of the sub-pixel SGb displaying the unit image Gb12 is higher than the potential Va13 (= V) of the pixel electrode 5 of the sub-pixel SGb displaying the adjacent unit image Ba13. Since it is high, the potential Vb12 rises due to the influence of the potential Va13 during actual display.

  In FIG. 5, the potential Vb13 (> V) of the pixel electrode 5 of the sub pixel SGb displaying the unit image Bb13 is higher than the potential Va14 (= V) of the pixel electrode 5 of the sub pixel SGa displaying the adjacent unit image Ra14. Therefore, during actual display, the potential Vb13 rises due to the influence of the potential Va14.

  Similarly, the potential Vb14 of the pixel electrode 5 of the subpixel SGb that displays the unit image Rb14 decreases during the actual display due to the influence of the adjacent subpixel SGa, and the pixel of the subpixel SGb that displays the unit image Gb15. The potential Vb15 of the electrode 5 rises, and the potential Vb16 of the pixel electrode 5 of the sub-pixel SGb that displays the unit image Bb16 rises.

  That is, when the image B is actually displayed on the normally white liquid crystal display panel 20, the tone value of R becomes higher and the tone value of BG becomes lower due to the crosstalk caused by the image A. For this reason, the image B that has been displayed in red is displayed with an emphasis on red due to the influence of the occurrence of crosstalk due to the display of the image A.

(Crosstalk correction)
Therefore, in the image display apparatus 100 according to the present embodiment, the control unit 40 applies a potential applied to a predetermined pixel electrode to the predetermined pixel electrode in order to suppress the influence due to the occurrence of the crosstalk described above. And a correction amount obtained based on a potential applied to a pixel electrode adjacent to the predetermined pixel electrode along the scanning line.

  FIG. 7 shows the gradation value of the unit image displayed on the sub-pixel SGa (hereinafter simply referred to as “the gradation value of the sub-pixel SGa”) and the sub-pixel SGb adjacent to the sub-pixel SGa. 6 is a graph showing the relationship between the gradation value of a unit image (hereinafter simply referred to as “the gradation value of an adjacent subpixel SGb”) and the correction amount of the potential applied to the subpixel SGa.

  The control unit 40 stores the relationship of the graph shown in FIG. 7 in a memory or the like as a table, and the corresponding subpixel based on the gradation value of the subpixel SGa and the gradation value of the adjacent subpixel SGb. The correction amount of the SGa gradation value is obtained. In other words, the control unit 40 is based on the potential applied to the pixel electrode 5 of the sub-pixel SGa and the potential applied to the pixel electrode 5 of the adjacent sub-pixel SGb, and the potential applied to the sub-pixel SGa. Determine the amount of correction.

  For example, in the graph shown in FIG. 7, on the straight line 51, the gradation value of the sub-pixel SGa is equal to the gradation value of the adjacent sub-pixel SGb. At this time, since the potential applied to the pixel electrode 5 of the subpixel SGa is equal to the potential applied to the pixel electrode 5 of the adjacent subpixel SGb, no crosstalk occurs, and the control unit 40 There is no need to correct the potential applied to the pixel electrode 5 of the sub-pixel SGa.

  Within the range of the regions 52 and 54, the gradation value of the sub pixel SGa is smaller than the gradation value of the adjacent sub pixel SGb. That is, the potential applied to the pixel electrode 5 of the sub pixel SGa is larger than the potential applied to the pixel electrode 5 of the adjacent sub pixel SGb. Therefore, due to the occurrence of crosstalk, the potential applied to the pixel electrode 5 of the sub-pixel SGa shifts in the direction of increasing, that is, the gradation value of the sub-pixel SGa is shifted down. Therefore, the control unit 40 needs to perform correction for increasing the gradation value of the subpixel SGa in advance, in other words, correction for decreasing the potential applied to the pixel electrode 5 of the subpixel SGa.

  Within the range of the regions 53 and 55, the gradation value of the sub pixel SGa is larger than the gradation value of the adjacent sub pixel SGb. That is, the potential applied to the pixel electrode 5 of the subpixel SGa is smaller than the potential applied to the pixel electrode 5 of the adjacent subpixel SGb. Therefore, due to the occurrence of crosstalk, the potential applied to the pixel electrode 5 of the sub-pixel SGa shifts in the direction of decreasing, that is, the gradation value of the sub-pixel SGa is shifted up. Therefore, the control unit 40 needs to perform correction for reducing the gradation value of the subpixel SGa in advance, in other words, correction for increasing the potential applied to the pixel electrode 5 of the subpixel SGa.

  In the graph of FIG. 7, the potential applied to the pixel electrode 5 of the subpixel SGa and the potential applied to the pixel electrode 5 of the adjacent subpixel SGb are outside the range of the regions 52, 53, 54, and 55. Even if there is a difference between them, the potential fluctuation due to the influence of the crosstalk of the potential applied to the pixel electrode 5 of the sub-pixel SGa is small. Therefore, in the image display device 100 according to the present embodiment, the correction amount for the potential applied to the pixel electrode 5 of the sub-pixel SGa is set to 0 outside the range of the regions 52, 53, 54, and 55, and correction is not performed. And

  In FIG. 7, the symbols “VcH” and “VcL” attached to each region indicate the magnitude relationship of the correction amounts. That is, in the region 55 with the symbol “+ VcH” and the region 53 with the symbol “+ VcL”, the potential added by the correction amount is applied to the subpixel SGa, but is indicated by “+ VcH”. A region 55 is a region having a relatively large correction amount, and a region 53 indicated by “+ VcL” is a region having a relatively small correction amount (including correction amount = 0). Similarly, a potential obtained by subtracting a correction amount is applied to the subpixel SGa in both the region 54 with the symbol “-VcH” and the region 52 with the symbol “-VcL”. A region 54 indicated by “VcH” is a region having a relatively large correction amount, and a region 52 indicated by “−VcL” is a region having a relatively small correction amount (including correction amount = 0). That is, these “Vcl” and “VcH” do not indicate actual correction amounts, but indicate whether each of the regions 52, 53, 54, and 55 is a relatively large or small correction region. Not too much. That is, it does not indicate that the correction amounts of all the points in the region 52 are all the same correction amount “−Vcl”.

  FIG. 7 is only an example of a graph that roughly shows the magnitude of the correction amount for each region. Therefore, the actual correction amount may be “0” even in each region, and naturally the size (range size) of each region may be different from the example shown in FIG.

  Within the region 54, the gradation of the sub-pixel SGa is a low gradation close to black, and the gradation of the adjacent sub-pixel SGb is halftone. That is, a high potential with a low gradation is applied to the pixel electrode 5 of the sub-pixel SGa, and a predetermined potential with a gradation of halftone is applied to the pixel electrode 5 of the adjacent sub-pixel SGb. The increase amount due to the crosstalk of the potential applied to the pixel electrode 5 of the subpixel SGa within the region 54 is increased by the crosstalk of the potential applied to the pixel electrode 5 of the subpixel SGa within the region 52. Larger than the amount. Therefore, in the image display device 100 according to the present embodiment, the correction amount to be subtracted in advance of the potential applied to the pixel electrode 5 of the subpixel SGa within the region 54 is the value of the subpixel SGa within the region 52. It is set to be larger than the correction amount to be subtracted in advance from the potential applied to the pixel electrode 5.

  Within the region 55, the gradation of the sub-pixel SGa is a high gradation close to white, and the gradation of the adjacent sub-pixel SGb is halftone. That is, a low potential with high gradation is applied to the pixel electrode 5 of the subpixel SGa, and a predetermined potential with halftone is applied to the pixel electrode 5 of the adjacent subpixel SGb. The amount of decrease due to the crosstalk of the potential applied to the pixel electrode 5 of the subpixel SGa within the region 55 is reduced by the crosstalk of the potential applied to the pixel electrode 5 of the subpixel SGa within the region 53. Larger than the amount. Therefore, in the image display device 100 according to the present embodiment, the correction amount added in advance to the potential applied to the pixel electrode 5 of the subpixel SGa in the range of the region 55 is the value of the subpixel SGa in the range of the region 53. The correction amount is set to be larger than a correction amount added in advance to the potential applied to the pixel electrode 5.

  In summary, in the image display device 100 according to the present embodiment, when the control unit 40 displays an image, the potential applied to the pixel electrode 5 of the sub-pixel SGa is the pixel electrode 5 of the adjacent sub-pixel SGb. Is applied to the pixel electrode 5 of the sub-pixel SGa by performing a correction by adding a correction amount in advance to the potential applied to the pixel electrode 5 of the sub-pixel SGa. When the potential is higher than the potential applied to the pixel electrode 5 of the adjacent subpixel SGb, correction is performed by subtracting the correction amount in advance from the potential applied to the pixel electrode 5 of the subpixel SGa. .

  At this time, the control unit 40 obtains the correction amount based on the potential applied to the pixel electrode 5 of the sub pixel SGa and the potential applied to the pixel electrode 5 of the adjacent sub pixel SGb. For example, the control unit 40 applies a high gradation or low gradation potential to the pixel electrode 5 of the sub pixel SGa, and applies a predetermined potential of medium gradation to the pixel electrode 5 of the adjacent sub pixel SGb. In this case, since the potential fluctuation of the pixel electrode 5 of the sub-pixel SGa is large due to the influence of crosstalk, the correction is performed by setting the correction amount large. By doing in this way, the image display apparatus 100 according to the present embodiment can correct the potential applied to the pixel electrode for each sub-pixel with an appropriate correction amount, in particular, the influence of crosstalk. Thus, it is possible to appropriately correct even a sub-pixel in which the potential fluctuation of the pixel electrode is large.

  Next, a specific driving method for crosstalk correction of the image display apparatus 100 according to the present embodiment will be described with reference to the flowchart shown in FIG.

  First, the control unit 40 performs crosstalk correction on one of the synthesized images C to be synthesized, for example, the image A. First, the control unit 40 is a table showing the relationship of the graph shown in FIG. 7 from the gradation value of the predetermined unit image of the image A and the gradation value of the unit image of the image B adjacent to the predetermined unit image. Is used to determine the correction amount of the potential applied to the pixel electrode 5 of the sub-pixel SGa for displaying the predetermined unit image (step S11). The control unit 40 performs the operation in step S11 on all unit images of the image A.

  The potential supplied to the pixel electrode 5 of the sub-pixel SGa when the crosstalk correction is performed on all the unit images of the image A in this way is shown in an enlarged view of the composite image C in FIG. In FIG. 9, correction amounts Vc11 to Vc16 indicate correction amounts that are added to or subtracted from the potential of the pixel electrode 5 of the sub-pixel SGa when crosstalk correction is performed. The value of the correction amount is obtained from a table showing the relationship of the graph shown in FIG.

  As described with reference to FIGS. 6 and 7, the potential Va <b> 11 decreases due to the influence of the potential Vb <b> 12 and becomes smaller than the potential V at the time of actual display. The correction amount Vc11 obtained from the table indicating the above is added in advance to the potential Va11. In the actual display, the potential Va12 decreases due to the influence of the potential Vb13 and becomes smaller than the potential V. Therefore, the control unit 40 sets the correction amount Vc12 obtained from the table showing the relationship of the graph shown in FIG. , The potential Va12 is added in advance. In the actual display, the potential Va13 rises due to the influence of the potential Vb14 and becomes larger than the potential V. Therefore, the control unit 40 sets the correction amount Vc13 obtained from the table showing the relationship of the graph shown in FIG. Then, the potential Va13 is subtracted in advance.

  Similarly, due to the influence of the pixel electrodes 5 of the adjacent sub-pixels SGb, in the actual display, the potential Va14 decreases and becomes smaller than the potential V, the potential Va15 decreases and becomes smaller than the potential V, and the potential Va16. Rises and becomes greater than the potential V. Therefore, the control unit 40 previously adds the correction amount Vc14 obtained from the graph showing the relationship of the graph shown in FIG. 7 to the potential Va14, adds the correction amount Vc15 to the potential Va15 in advance, and corrects the correction amount Vc16. Is subtracted in advance from the potential Va16.

  The control unit 40 performs crosstalk correction on the image A in advance, thereby increasing the potential of the pixel electrode of RG that decreases due to the influence of crosstalk during actual display, and the pixel B that increases due to the influence of crosstalk. The potential of the electrode can be lowered. Accordingly, the control unit 40 can bring the potentials from the potentials Va11 to 16 close to V in the actual display of the image A, and can perform gray display.

  Returning to the flowchart of FIG. 8, in step 12, the control unit 40 determines whether or not the crosstalk correction has been performed on all unit images of both the image A and the image B, that is, the above-described crosstalk correction is performed on the image. It is determined whether or not B is also performed, and if it is determined that the crosstalk correction has not been performed on the unit image of image B (step S12: No), the process returns to step S11, and step is performed on the unit image of image B. The operation of S11 is repeated.

  If the control unit 40 determines in step 12 that the crosstalk correction has been performed on both unit images A and B (step S12: Yes), the image A and the image B that have been subjected to the crosstalk correction, respectively. The control signal of the composite image C synthesized is supplied to the scanning line drive circuit 21 and the data line drive circuit 22 of the liquid crystal display panel 20 to display the composite image C on the liquid crystal display panel 20 (step S13), and the processing is ended. To do.

  As described above, in the image display apparatus 100 according to the present embodiment, when displaying an image, the control unit 40 is adjacent to the potential applied to the pixel electrode of the predetermined subpixel and the predetermined subpixel. The correction amount is obtained based on the potential applied to the pixel electrode of the subpixel, and the potential applied to the pixel electrode of the predetermined subpixel is smaller than the potential applied to the pixel electrode of the adjacent subpixel. In such a case, correction is performed by adding the correction amount in advance to the potential applied to the pixel electrode of the predetermined subpixel, and the potential applied to the pixel electrode of the predetermined subpixel When the potential is higher than the potential applied to the pixel electrode of the subpixel, correction is performed by subtracting the correction amount in advance from the potential applied to the pixel electrode of the predetermined subpixel. By doing in this way, the image display apparatus 100 according to the present embodiment can correct the potential applied to the pixel electrode for each sub-pixel with an appropriate correction amount, and reduce crosstalk. Thus, display quality can be improved.

[Modification]
Although the image display device according to the above-described embodiment performs two-screen display, the present invention is not limited to this, and it goes without saying that the present invention can also be applied when performing stereoscopic image display instead. In this case, the potential of the pixel electrode for displaying the unit image of the right-eye image is affected by the crosstalk due to the potential of the pixel electrode for displaying the unit image of the adjacent left-eye image. The potential of the pixel electrode for displaying the unit image of the image is affected by crosstalk due to the potential of the pixel electrode for displaying the unit image of the adjacent right-eye image. However, by using the method as described above, the image display apparatus can reduce crosstalk generated between images entering the left and right eyes.

[Electronics]
Next, a specific example of an electronic apparatus to which the image display device 100 according to each embodiment described above can be applied will be described with reference to FIG.

  First, an example in which the image display device 100 according to each embodiment is applied to a display unit of a portable personal computer (so-called notebook computer) will be described. FIG. 10 is a perspective view showing the configuration of this personal computer. As shown in the figure, the personal computer 710 includes a main body 712 having a keyboard 711 and a display 713 to which the liquid crystal display device 100 according to the present invention is applied.

  The image display device 100 according to each embodiment is particularly preferably applied to a liquid crystal television or a display unit of a car navigation device. For example, by using the image display device 100 according to the present embodiment in the display unit of the car navigation device, a map image is displayed for an observer in the driver's seat, and an observer in the passenger seat is displayed. Can display images such as movies.

  In addition to the above-described electronic devices to which the image display device 100 or the like according to each embodiment can be applied, a viewfinder type / monitor direct-view type video tape recorder, pager, electronic notebook, calculator, mobile phone, A word processor, a workstation, a video phone, a POS terminal, a digital still camera, and the like can be given.

It is sectional drawing of the image display apparatus which concerns on this embodiment. It is a top view of the liquid crystal display panel in the image display apparatus concerning this embodiment. It is a schematic diagram when creating a composite image from two images. It is a circuit diagram which shows a part of drive circuit of the image display apparatus which concerns on this embodiment. It is an enlarged view of a synthesized image when the influence of crosstalk is not considered. It is an enlarged view of a synthesized image when the influence of crosstalk is taken into consideration. It is a graph which shows the relationship between the gradation value of a sub pixel, and the correction amount of an electric potential. 5 is a flowchart illustrating a method for driving the image display apparatus according to the present embodiment. It is an enlarged view of a composite image when crosstalk correction is performed. It is an example of the electronic device to which the image display apparatus of this invention is applied.

Explanation of symbols

  5 pixel electrode, 7 counter electrode, 9 parallax barrier, 10 illumination device, 11a, 11b observer, 21 scanning line driving circuit, 22 data line driving circuit, 23 FPC, 24 scanning line, 25 data line, 26 switching element, 20 Liquid crystal display panel, 40 control unit, 100 image display device

Claims (4)

A display panel having a plurality of data lines, a plurality of scanning lines, and a pixel electrode provided corresponding to an intersection of the plurality of data lines and the plurality of scanning lines;
A parallax barrier disposed on the surface of the display panel and having a slit disposed between the pixel electrodes adjacent to each other;
A control unit that displays an image by controlling the magnitude of the potential applied to the pixel electrode by controlling a data signal supplied to the plurality of data lines and a scanning signal supplied to the plurality of scanning lines, respectively. With
The control unit obtains a correction amount based on a potential applied to a predetermined pixel electrode and a potential applied to a pixel electrode adjacent to the predetermined pixel electrode along the scanning line when displaying an image. When the potential applied to the predetermined pixel electrode is smaller than the potential applied to the adjacent pixel electrode, the correction amount is added in advance to the potential applied to the predetermined pixel electrode. When the potential applied to the predetermined pixel electrode is larger than the potential applied to the adjacent pixel electrode, the correction is performed on the potential applied to the predetermined pixel electrode. An electro-optical device that performs correction to subtract a quantity in advance.   The control unit maximizes the correction amount when a high gradation or low gradation potential is applied to the predetermined pixel electrode and a halftone potential is applied to the adjacent pixel electrode. The electro-optical device according to claim 1.   An electronic apparatus comprising the electro-optical device according to claim 1 in a display unit. A display panel having a plurality of data lines, a plurality of scanning lines, and a pixel electrode provided corresponding to an intersection of the plurality of data lines and the plurality of scanning lines;
A parallax barrier disposed on the surface of the display panel and having a slit disposed between the pixel electrodes adjacent to each other;
A control unit that displays an image by controlling the magnitude of the potential applied to the pixel electrode by controlling a data signal supplied to the plurality of data lines and a scanning signal supplied to the plurality of scanning lines, respectively. A method for driving an electro-optical device comprising:
The control unit obtains a correction amount based on a potential applied to a predetermined pixel electrode and a potential applied to a pixel electrode adjacent to the predetermined pixel electrode along the scanning line when displaying an image. When the potential applied to the predetermined pixel electrode is smaller than the potential applied to the adjacent pixel electrode, the correction amount is added in advance to the potential applied to the predetermined pixel electrode. When the potential applied to the predetermined pixel electrode is larger than the potential applied to the adjacent pixel electrode, the correction is performed on the potential applied to the predetermined pixel electrode. A method for driving an electro-optical device, wherein correction for subtracting the amount in advance is performed.

Images