JP2015118113A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in which: in a lateral stripe arrangement of RGBW in which half the number of B of R, G, and B is replaced with W, when dot inversion drive or pixel inversion drive is performed, flicker occurs, and when column inversion drive is performed, there are risks of streaks during the movement of a line of sight due to a difference in brightness between polarities and a reduction in yield due to leakage crosstalk.SOLUTION: A display device has a lateral stripe arrangement in which half the number of B of R, G, and B is replaced with W. R and G are driven so that the polarities are arranged in checkers for each color, and B and W, which are thinned out, are driven so that the polarities are arranged the same in the vertical direction and horizontal direction.

Description

  The present disclosure relates to a display device, and is applicable to, for example, a display device having an RGBW horizontal stripe arrangement.

In the liquid crystal display panel, alternating drive is performed in order to avoid deterioration due to DC application to the liquid crystal. For AC drive, frame inversion drive with the same polarity of each subpixel in a frame, line inversion drive with the same polarity in the horizontal direction (row direction), column inversion with the same polarity in the vertical direction (column direction) Driving, dot inversion driving in which pixels of the same polarity are in a checkered pattern, pixel inversion driving in which sub-pixels (subpixels) of the same polarity are in a checkered pattern in units of pixels (pixels), and the like. Usually, one pixel is composed of three sub-pixels of R (red sub-pixel), G (green sub-pixel), and B (blue sub-pixel).
Further, in liquid crystal display panels, there is an increasing demand for high-luminance products depending on applications and the like, but as disclosed in Japanese Patent Application Laid-Open No. 2007-41551 (Patent Document 1) as means for improving luminance, A method has been proposed in which W (white subpixel) is added to conventional RGB color elements. Each display pixel in one example of this method is composed of 6 subpixels of 2 rows × 3 columns, and the first row is arranged in the order of R, B, G, and the second row is in the order of G, W, R. .

JP 2007-41551 A

As a result of studying a driving method in an RGBW horizontal stripe arrangement in which half of B among R, G, and B is replaced with W, the present inventors have found the following problems.
Even if the common adjustment or the like is appropriately performed, it is difficult to completely eliminate the luminance difference between the positive electrode and the negative electrode, and flickering in frame inversion driving, streaking due to line-of-sight movement becomes a problem in line inversion driving and column inversion driving. In frame inversion driving and column inversion driving, the polarity of the video signal is the same in one frame, so capacitive and leaky crosstalk is likely to occur. desirable.
In the horizontal stripe arrangement of RGBW, when dot inversion driving or pixel inversion driving is used, the polarity arrangement of R and G is checkered, whereas the polarity of B and W is the same polarity. Will occur.
Further, in the case of column inversion driving in the RGBW horizontal stripe arrangement, there is a concern that the line of sight shift due to a luminance difference between polarities or a yield reduction due to leaky crosstalk.
Other problems and novel features will become apparent from the description of the present disclosure and the accompanying drawings.

The outline of a representative one of the present disclosure will be briefly described as follows.
That is, the display device includes a plurality of first pixels and a plurality of second pixels. Each of the plurality of first pixels includes a red subpixel, a green subpixel, and a blue subpixel arranged in the column direction. Each of the plurality of second pixels has a red subpixel, a green subpixel, and a white subpixel arranged in the column direction. Each of the plurality of first pixels and each of the plurality of second pixels are disposed adjacent to each other. The red subpixels of the first and second pixels are arranged in the same row. The green subpixels of the first and second pixels are arranged in the same row. The blue subpixel of the first pixel and the white subpixel of the second pixel are arranged in the same row. The first and second pixels are driven so that the polarities of the red and green subpixels are in a checkered arrangement for each color. The blue sub-pixel of the first pixel and the white sub-pixel of the second pixel are driven so as to have the same polarity in the vertical direction or the horizontal direction.

It is a top view which shows the whole structure of the display apparatus which concerns on a comparative example. It is a figure which shows the dot inversion drive (odd frame) in the general RGB horizontal stripe arrangement | sequence. It is a figure which shows the dot inversion drive (even number frame) in the general RGB horizontal stripe arrangement | sequence. It is a figure which shows the dot inversion drive (odd frame) of the display apparatus which concerns on a comparative example. It is a figure which shows the dot inversion drive (even number frame) of the display apparatus which concerns on a comparative example. It is a figure which shows the pixel inversion drive (odd frame) in the general RGB horizontal stripe arrangement | sequence. It is a figure which shows the pixel inversion drive (even frame) in the general RGB horizontal stripe arrangement | sequence. It is a figure which shows the pixel inversion drive (odd frame) of the display apparatus which concerns on a comparative example. It is a figure which shows the pixel inversion drive (even frame) of the display apparatus which concerns on a comparative example. It is a top view which shows the structure of the display apparatus which concerns on an Example. It is a figure which shows arrangement | positioning of the pixel of the display apparatus which concerns on an Example. It is a block diagram which shows the structure of the driver IC based on an Example. It is a block diagram which shows the structure for 2 outputs of the output circuit of the driver IC which concerns on an Example. It is a figure which shows the pseudo pixel inversion drive (odd number frame) which concerns on an Example. It is a figure which shows the pseudo pixel inversion drive (even frame) which concerns on an Example. It is a figure which shows the operation | movement of the pseudo pixel inversion drive (odd frame) which concerns on an Example. It is a figure which shows the operation | movement of the pseudo pixel inversion drive (even number frame) which concerns on an Example. It is a figure which shows the operation | movement of the pixel inversion drive (odd frame) in RGB horizontal stripe arrangement | sequence. It is a figure which shows the pseudo pixel inversion drive (odd frame) concerning the modification 1. It is a figure which shows the pseudo pixel inversion drive (even frame) concerning the modification 1. It is a figure which shows the operation | movement of the pseudo pixel inversion drive (odd frame) which concerns on the modification 1. FIG. It is a figure which shows the pseudo dot inversion drive (odd frame) concerning the modification 2. It is a figure which shows the pseudo dot inversion drive (even frame) concerning the modification 2. It is a figure which shows the operation | movement of the pseudo dot inversion drive (odd number frame) which concerns on the modification 2. FIG. It is a figure which shows the pseudo dot inversion drive (odd frame) which concerns on the modification 3. It is a figure which shows the pseudo dot inversion drive (even number frame) which concerns on the modification 3. It is a figure which shows the operation | movement of the pseudo dot inversion drive (odd number frame) which concerns on the modification 3. FIG.

First, problems in the case of dot inversion driving or pixel inversion driving in the RGBW horizontal stripe arrangement will be described with reference to FIGS.
FIG. 1 is a plan view showing an overall configuration of a display device according to a comparative example. The display device 10R according to the comparative example is an RGBW horizontal stripe array display device. The display device 10R includes a display panel 11R having an array substrate (TFT substrate), a counter substrate (CF substrate), and a liquid crystal layer. The display device panel 11R has a display area AR and a peripheral area FR. The display area AR includes m columns in the X direction, n rows of pixels in the Y direction, m video signal lines X (X1 to Xm), 3 × n scanning lines Y (Y1 to Y3n), There is. In the display area AR, the video signal line X extends in the Y direction, and the scanning line Y extends in the X direction. The display area AR includes a first pixel composed of R, G, and B and a second pixel composed of R, G, and W. The sub-pixels of the first pixel are arranged in the order of R, G, and B in the Y direction. The subpixels of the second pixel are arranged in the order of R, G, and W. Each of the R, G, B, and W subpixels has a stripe shape in which the horizontal direction (X direction) is longer than the vertical direction (Y direction). R is arranged in the X direction along the same scanning line. G is arranged in the X direction along the same scanning line. B and W are alternately arranged in the X direction along the same scanning line. The peripheral area FR includes a driver IC (DRV) 12a and a scanning circuit (SCC) 12b. The video signal line X is driven by the driver IC 12a, and the scanning line Y is driven by the scanning circuit 12b. The driver IC 12a is mounted on the array substrate by COG or the like. The scanning circuit 12b is formed of a thin film transistor (TFT) on the array substrate.

(1) Dot Inversion Drive FIG. 2A is a diagram showing dot inversion drive (odd frame) in a general RGB horizontal stripe arrangement. FIG. 2B is a diagram showing dot inversion driving (even frame) in a general RGB horizontal stripe arrangement. FIG. 3A is a diagram showing dot inversion driving (odd number frames) of a display device according to a comparative example. FIG. 3B is a diagram illustrating dot inversion driving (even frame) of the display device according to the comparative example.
Sub-pixels are arranged at the intersections of the video signal lines X1 and X2 and the scanning lines Y1 to Y6. In FIG. 2A and FIG. 2B, all the pixels are composed of three sub-pixels R, G, and B (hereinafter referred to as “RGB pixels”). In FIG. 3A and FIG. 3B, half of the pixels are RGB pixels, and the remaining half of the pixels are composed of three sub-pixels of R, G, and W (hereinafter referred to as “RGW pixels”). The RGB pixels and the RGW pixels are alternately arranged in any of the extending direction (Y direction) of the video signal lines X1 and X2 and the extending direction (X direction) of the scanning lines Y1 to Y6. Each pixel is connected to one signal line and three scanning lines. Each sub-pixel has a stripe shape in which the horizontal direction (X direction) is longer than the vertical direction (Y direction). The pixel arrangement in FIGS. 2A and 2B is hereinafter referred to as “RGB horizontal stripe arrangement”. Hereinafter, in FIG. 4A and FIG. 4B, it is the same. The pixel arrangement in FIGS. 3A and 3B is hereinafter referred to as “RGBW horizontal stripe arrangement”. The same applies to FIGS. 5A, 5B, 9A, 9B, 10A, 10B, 11A, and 11B.
In FIG. 2A, FIG. 2B, FIG. 3A and FIG. 3B, R + means that a positive voltage is applied to R, and R− means that a negative voltage is applied to R. G + means that a positive voltage is applied to G, and G- means that a negative voltage is applied to G. B + means that a positive voltage is applied to B, and B− means that a negative voltage is applied to B. Furthermore, W + means that a positive voltage is applied to W, and W− means that a negative voltage is applied to W. The same applies to FIGS. 4A, 4B, 5A, 5B, 9A, 9B, 10A, 10B, 11A, and 11B.
In the dot inversion drive in the RGB horizontal stripe arrangement, as shown in FIGS. 2A and 2B, the polarity is changed for each sub-pixel, and the polarity arrangement in a certain frame for each of R, G, and B is a checkered pattern. Yes.
In the dot inversion driving in the RGBW horizontal stripe arrangement, half of B is replaced with W as shown in FIGS. 3A and 3B. When the polarity is changed for each subpixel, the polarity arrangement in a certain frame is a checkered pattern for each of R and G. On the other hand, in the odd-numbered frame in FIG. 3A, B is all positive and W is all negative. In the odd-numbered frame in FIG. 3B, all B are negative and all W are positive. That is, since B and W all have the same polarity in a certain frame, flicker may occur due to a luminance difference between the polarities.

(2) Pixel Inversion Drive FIG. 4A is a diagram showing pixel inversion drive (odd frame) in a general RGB horizontal stripe arrangement. FIG. 4B is a diagram showing pixel inversion driving (even number frames) in a general RGB horizontal stripe arrangement. FIG. 5A is a diagram illustrating pixel inversion driving (odd number frames) of a display device according to a comparative example. FIG. 5B is a diagram illustrating pixel inversion driving (even number frames) of the display device according to the comparative example.
In the pixel inversion driving in the RGB horizontal stripe arrangement, as shown in FIGS. 4A and 4B, the polarity is changed for each pixel, and the polarity arrangement in a certain frame for each of the RGB pixels is a checkered pattern.
In the pixel inversion driving in the RGBW horizontal stripe arrangement, half of B is replaced with W as shown in FIGS. 5A and 5B. When the polarity is changed for each pixel, the polarity arrangement in a certain frame for each of R and G is a checkered pattern. On the other hand, in the odd-numbered frame in FIG. 5A, B is all positive and W is all negative. In the odd-numbered frame in FIG. 5B, all B are negative and all W are positive. That is, since B and W all have the same polarity in a certain frame, flicker may occur due to a luminance difference between the polarities.

  As described above, when dot inversion driving or pixel inversion driving is performed in the RGBW horizontal stripe arrangement, the polarity of B and W in a certain frame is biased to one polarity, and thus flicker occurs due to luminance fluctuation due to the polarity difference. there is a possibility.

  Therefore, by changing the polarity arrangement of R and G and the polarity arrangement of B and W, streaks due to flicker and line-of-sight movement in the RGBW horizontal stripe arrangement are suppressed. As an embodiment, the polarity arrangement of R and G is a checkered arrangement for each color, and B and W for which thinning is performed are arranged in the same polarity in the vertical direction or the horizontal direction. As one aspect, in the pixel inversion driving, the polarity arrangement of R and G is a checkered arrangement for each color, and B and W are the same arrangement in the vertical direction (hereinafter referred to as “pseudo pixel inversion driving”). In the pseudo pixel inversion driving, R and G are the same driving as the pixel inversion driving. As another aspect, in the dot inversion drive, the polarity arrangement of R and G is a checkered arrangement for each color, and the polarity of B and W is the same in the vertical or horizontal direction (hereinafter referred to as “pseudo dot inversion drive” That said.) In the pseudo dot inversion drive, R and G are the same as the dot inversion drive. When the positive and negative outputs in the horizontal direction are the same due to common use of the positive and negative amplifiers of the driver IC, the polarities of B and W are arranged in the same direction in the vertical direction. That is, B and W are the same as the column inversion drive.

  According to this embodiment, when the RGBW horizontal stripe arrangement is applied, the driving becomes close to dot inversion or column inversion driving, and thus flicker and the like can be reduced and the image quality can be improved. According to the present embodiment, since the driving is resistant to leakage, the yield can be improved.

A configuration of an RGBW display device having a triple gate pixel arrangement according to the embodiment will be described with reference to FIGS. 6A and 6B.
FIG. 6A is a plan view illustrating the configuration of the display device according to the example. FIG. 6B is a diagram illustrating an arrangement of pixels of the display device according to the example.
The display panel 11 has a rectangular shape in plan view and is horizontally long in the horizontal direction (X direction) longer than the vertical direction (Y direction). The display panel 11 includes a display area (active area) AA composed of a plurality of pixels and a peripheral area (frame area) FA having a drive circuit, wiring, and the like. The display panel 11 includes a TFT substrate (array substrate) on which thin film transistors (TFT) and the like are formed, and a CF substrate (counter substrate) on which color filters (CF) and the like are formed. A liquid crystal layer is sandwiched between the TFT substrate and the CF substrate.

  In the display area AA, there are a pixel (RGB pixel) 13B composed of R, G, and B and a pixel (RGW pixel) 13W composed of R, G, and W. The RGB pixel 13B and the RGW pixel 13W are arranged every other pixel. The sub-pixels are arranged in the vertical direction (−Y direction), for example, in the order of R, G, B or R, G, W. For R and G, sub-pixels of the same color are arranged in the horizontal direction (X direction). In other words, R and G are arranged in the same row. B and W are alternately arranged in the horizontal direction (X direction). In other words, B and W are arranged in the same row. One subpixel has a horizontally long stripe shape in which the horizontal direction (X direction) is longer than the vertical direction (Y direction). In the display area AA, there are n subpixels in the horizontal direction and m in the vertical direction, for a total of n × m. The front display area AA has n pixels horizontally and m / 3 vertically, and has a total of n × m / 3. Here, n and m are natural numbers, and m is a multiple of 3 (m = 3 m ′, m ′ is a natural number).

  One driver IC 12 is arranged in the peripheral area FA on the right side of the display panel 11. The driver IC has both a gate line (scanning line) driving circuit and a source line (video signal line) driving circuit. In the display area AA, source lines SL (S1, S2, S3, S4,..., Sn-3, Sn-2, Sn-1, Sn) are arranged in the vertical direction (column direction, Y direction). It extends in the vertical direction in common with the pixels. The source lines SLL (S1, S2,..., Sn-3, Sn-2) are output circuit units on the lower side (left side) of the driver IC 12 via the wiring of the peripheral area FA on the lower side of the display panel 11. It is driven by 12L. The source lines SLR (S3, S4,..., Sn-1, Sn) are driven by the output circuit unit 12R on the upper side (right side) of the driver IC 12 via the wiring of the peripheral area FA on the upper side of the display panel 11. The That is, the upper side driving and the lower side driving are switched every two source lines. In the display area AA, gate lines GL (G1, G2, G3, G4, G5,..., Gm-5, Gm-4, Gm-3, Gm-2, Gm-1, Gm) are arranged in the horizontal direction. It extends in the horizontal direction in common with the pixels arranged in the (row direction, X direction). The gate lines GLR (G1, G2, G3, G4, G5, G6,...) Are driven from the right side of the display panel 11 by the output circuit unit 12R on the upper side (right side) of the driver IC 12. The gate lines GLL (Gm, Gm-1, Gm-2, Gm-3, Gm-4, Gm-5,...) Are output circuit units on the lower side (left side) of the driver IC 12 from the right side of the display panel 11. It is driven by 12L. The gate line G1 drives R, the gate line G2 drives G, and the gate line G3 drives B and W. The gate line is three triple gates per pixel. The driver IC 12 generates a source signal (Source_1,..., Source_n) and a gate signal (Gate_1,..., Gate_m). The driver IC 12 is a semiconductor integrated circuit device manufactured by a CMOS process or the like on one semiconductor substrate, and is mounted on the TFT substrate by COG or the like. The driver IC 12 has a terminal on a rectangular semiconductor chip, and a source line and a gate line are connected to the terminal. Therefore, each of the source line SL and the gate line GL crosses one side of the semiconductor chip. One driver IC 12 may be arranged in the peripheral area FA on the left side of the display panel.

  As a result, the number of source outputs of the driver IC 12 can be reduced to 1/3, so that the number of source lines wired on the upper and lower frames becomes 1/3. Since it is a triple gate, the number of gate lines is tripled, but since the driver IC 12 is placed horizontally, there is no effect on the frame width due to wiring. Therefore, an increase in the frame area can be suppressed. Further, it is not necessary to form a gate line driving circuit on the TFT substrate with a TFT circuit.

  Note that when amorphous silicon (α-Si) is used for the TFT, this embodiment is preferable because a TFT circuit cannot be formed on the TFT substrate in the frame region.

Next, the configuration of the driver IC will be described with reference to FIGS.
FIG. 7 is a block diagram illustrating the configuration of the driver IC according to the embodiment. The driver IC 12 includes an output circuit (OC) 121, a gradation voltage generation circuit 122, a logic circuit 123, and a nonvolatile memory (NVM) 124. The gradation voltage generation circuit 122 includes a positive gradation generation part 122P and a negative gradation generation part 122N of one system, and supplies a positive gradation voltage (VP) and a negative gradation voltage (VN) to the output circuit 121. The logic circuit 123 includes an arithmetic circuit (ARC) 1231 that converts RGB data from the host controller (HST) 20 into RGBW data, a polarity control circuit (PCNT) 1232, a control register (CR) 1233, and the like, and is non-volatile. The memory 124 stores RGBW gradation voltage values. The control register 1233 stores the gradation voltage value, and the polarity control circuit 1232 sets the gradation voltage of the gradation voltage generation circuit 122 based on the setting value of the control register 1233. The first polarity signal (PS1) output from the polarity control circuit 1232 is input to the output circuit 121, and the second polarity signal (PS2) is input to the gradation voltage generation circuit 122. The gradation data (GD) output from the arithmetic circuit 1231 is input to the output circuit 121.

  FIG. 8 is a block diagram illustrating a configuration for two outputs of the output circuit of the driver IC according to the embodiment. The output circuit 121 shares a positive amplifier 1211 and a negative amplifier 1212, a positive D / A converter (DACP) 1213, and a negative D / A converter (DACN) 1214 with respect to the two output terminals O1 and O2. The output terminals O1 and O2 are connected to the source lines S1 and S2, respectively. The positive D / A converter 1213 generates a positive source line signal based on the positive gradation voltage (VP) and the positive gradation data (GDP) from the gradation voltage generation circuit 122. The negative D / A converter (DACN) 1214 generates a negative source line signal based on the negative gradation voltage (VN) and the negative gradation data (GDN) from the gradation voltage generation circuit 122. A first polarity signal (PS1) from the polarity control circuit 1232 is a switch 1215 for switching the positive / negative output, and a gradation data selection circuit (SLCTR) for selecting the positive / negative polarity of gradation data (GD1, GD2) for two columns. It is input to 1216. When the first polarity signal (PS1) is at a high level (H), the switch 1215 outputs the output of the positive amplifier 1211 to the output terminal O1, and outputs the output of the negative amplifier 1212 to the output terminal O2. When the first polarity signal (PS1) is at the low level (L), the switch 1215 outputs the output of the positive amplifier 1211 to the output terminal O2, and outputs the output of the negative amplifier 1212 to the output terminal O1. When the first polarity signal (PS1) is H, the gradation data selection circuit 1216 outputs the gradation data (GD1) as the positive gradation data (GDP) to the positive D / A converter 1213, and the gradation data ( GD2) is output to the negative D / A converter 1214 as negative gradation data (GDN). When the first polarity signal (PS1) is L, the gradation data selection circuit 1216 outputs the gradation data (GD1) as negative gradation data (GDN) to the negative D / A converter 1214, and the gradation data ( GD2) is output to the positive electrode D / A converter 1213 as positive gradation data (GDP). Note that the switch 1217 is used when the potential of the source line SL is fixed to GND when not displayed. Therefore, at the time of display, the switch 1217 outputs the outputs of the positive amplifier 1211 and the negative amplifier 1212 to the switch 1215.

The pseudo pixel inversion driving according to the embodiment will be described below with reference to FIGS. 9A to 9D.
FIG. 9A is a diagram illustrating pseudo pixel inversion driving (odd frame) according to the embodiment. FIG. 9B is a diagram illustrating pseudo pixel inversion driving (even number frames) according to the embodiment. FIG. 9C is a diagram illustrating an operation of pseudo pixel inversion driving (odd frame) according to the embodiment. FIG. 9D is a diagram illustrating the operation of the pseudo pixel inversion driving (even frame) according to the embodiment. FIG. 9E is a diagram showing an operation of pixel inversion driving in the RGB horizontal stripe arrangement.
As shown in FIGS. 9A and 9B, R and G in one pixel have the same polarity, and R and G each have a checkered polarity arrangement in a certain frame. B and W have the same polarity in the vertical direction. As shown in FIG. 9A, in the odd-numbered frame, B and W are both positive in the column of the source line S1, and B and W are both negative in the column of the source line S2. As shown in FIG. 9B, in the even-numbered frame, B and W are both negative in the column of the source line S1, and B and W are both positive in the column of the source line S2. As a result, B and W can be prevented from having the same polarity in a certain frame, and flicker due to a luminance difference between the polarities can be reduced.

The pseudo pixel inversion driving operation of the display device according to the embodiment will be described in comparison with the pixel inversion driving of the RGB horizontal stripe arrangement. Note that the driver IC 12 can also perform pixel inversion driving in an RGB horizontal stripe arrangement.
First, pixel inversion driving in an RGB horizontal stripe arrangement will be described with reference to FIGS. 4A, 4B, and 9E. When scanning in the order of R, G, and B, the gradation data selection circuit 1216 and the switch 1215 are controlled by H / L of the first polarity signal (PS1). When the first polarity signal (PS1) is H, the odd-numbered output (S_ODD) to the odd-numbered source line SL (video signal line X1 in FIGS. 4A and 4B) is positive (+), and the even-numbered source line SL. The switch 1215 and the gradation data selection circuit 1216 are controlled so that the even-numbered output (S_EVEN) to the video signal line X2 (in FIG. 4A and FIG. 4B) becomes negative (−). When the first polarity signal (PS1) is L, the odd-numbered output (S_ODD) to the odd-numbered source line SL (video signal line X1) is negative (−) and the even-numbered source line SL (video signal line X2). The switch 1215 and the gradation data selection circuit 1216 are controlled so that the even-numbered output (S_EVEN) is positive (+). Further, the positive polarity gradation voltage (VP) and the negative polarity gradation voltage (VN) of the gradation voltage generation circuit 122 are controlled by the second polarity signal (PS2). In the case of the RGB horizontal stripe arrangement, since the color in the row direction is single, the gradation voltage generation circuit 122 has the positive and negative electrodes of R in the R row, the positive and negative electrodes of G in the G row, and B in the B row. The second polarity signal (PS2) is fixed to H in order to generate the grayscale voltage by setting the positive / negative grayscale voltage.

Next, pseudo pixel inversion driving according to the embodiment will be described with reference to FIGS. 9C and 9D. The odd-numbered source lines SL (source lines S1) are scanned in the order of R, G, B, R, G, and W. The even-numbered source line SL (source line S2) scans in the order of R, G, W, R, G, and B. Similar to the pixel inversion driving of the RGB horizontal stripe arrangement in FIG. 9E, the gradation data selection circuit 1216 and the switch 1215 are controlled by H / L of the first polarity signal (PS1). The pixel inversion drive of the RGB horizontal stripe arrangement in FIG. 9E is different from the pixel inversion drive in the RGBW horizontal stripe arrangement, because B is thinned out to be W, so that the positive polarity generation circuit of the gradation voltage generation circuit 122 is generated by the second polarity signal (PS2). Control of 122P and the negative electrode generation circuit 122N is required. When the second polarity signal (PS2) is H, the positive polarity is B and the negative is W, and when the second polarity signal (PS2) is L, the positive is W and the negative is B. . As shown in FIGS. 9C and 9D, in the odd and even frames, the H / L of the first polarity signal (PS1) is opposite, and the H / L of the second polarity signal (PS2) is B and W. The reverse is true.
By the above, each polarity arrangement | positioning of R and G can be made into a checkered pattern, and each polarity arrangement | positioning of B and W can be made the same in the vertical direction. R and G are driven by pixel inversion, and B and W are driven by column inversion.

<Modification 1>
The pseudo pixel inversion driving according to the modification example (modification example 1) of the embodiment will be described below with reference to FIGS. 10A to 10C.
FIG. 10A is a diagram illustrating pseudo pixel inversion driving (odd frame) according to the first modification. FIG. 10B is a diagram illustrating pseudo pixel inversion driving (even number frames) according to the first modification. FIG. 10C is a diagram illustrating an operation of pseudo pixel inversion driving (odd frame) according to the first modification.
The difference between the embodiment and the first modification is that the polarities of B and W are reversed. As shown in FIG. 10A, in the odd-numbered frame, both B and W are negative in the column of the source line S1, and both B and W are positive in the column of the source line S2. As shown in FIG. 10B, in the even-numbered frame, B and W are both positive in the column of source lines S1, and B and W are both negative in the column of source lines S2. As a result, B and W can be prevented from having the same polarity in a certain frame, and flicker due to a luminance difference between the polarities can be reduced.

Next, the operation of the pseudo pixel inversion driving according to Modification Example 1 will be described in comparison with the pixel inversion driving according to the example.
As shown in FIG. 10C, in the pseudo pixel inversion driving according to the first modification, the grayscale data selection circuit 1216 is driven by H / L of the first polarity signal (PS1), similarly to the pixel inversion driving in the embodiment of FIG. 9C. The switch 1215 is controlled, and the positive polarity generation circuit 122P and the negative polarity generation circuit 122N of the gradation voltage generation circuit 122 are controlled by the second polarity signal (PS2). The difference from the pseudo-pixel inversion driving in the embodiment of FIG. 9C is that only the location where the first polarity signal (PS1) becomes H / L and the location where the second polarity signal (PS2) becomes H / L are different. is there. That is, it can be realized by changing only the function of the polarity control circuit 1232 without changing the output circuit 121 or the gradation voltage generation circuit 122. For example, the function of the polarity control circuit 1232 may be changed by setting data from the host controller 20 or the nonvolatile memory 124 in a register.
By the above, each polarity arrangement | positioning of R and G can be made into a checkered pattern, and each polarity arrangement | positioning of B and W can be made the same in the vertical direction. R and G are driven by pixel inversion, and B and W are driven by column inversion.

<Modification 2>
The pseudo dot inversion driving according to the modification example (modification example 2) of the embodiment will be described below with reference to FIGS. 11A to 11C.
FIG. 11A is a diagram illustrating pseudo-dot inversion driving (odd frame) according to the second modification. FIG. 11B is a diagram illustrating pseudo dot inversion driving (even number frames) according to the second modification. FIG. 11C is a diagram illustrating an operation of pseudo dot inversion driving (odd number frame) according to the second modification.
As shown in FIGS. 11A and 11B, R and G in one pixel have different polarities, and R and G each have a checkered polarity arrangement in a certain frame. B and W have the same polarity in the vertical direction. As shown in FIG. 11A, in the odd-numbered frame, B and W are both positive in the column of the source line S1, and B and W are both negative in the column of the source line S2. As shown in FIG. 11B, in the even-numbered frame, B and W are both negative in the column of the source line S1, and B and W are both positive in the column of the source line S2. As a result, B and W can be prevented from having the same polarity in a certain frame, and flicker due to a luminance difference between the polarities can be reduced.

Next, the operation of pseudo dot inversion driving according to Modification 2 will be described in comparison with the pixel inversion driving according to the example.
As shown in FIG. 11C, the pseudo-dot inversion driving according to the modification 2 is similar to the pixel inversion driving of the embodiment of FIG. 9C in accordance with the H / L of the first polarity signal (PS1) and the gradation data selection circuit 1216. The switch 1215 is controlled, and the positive polarity generation circuit 122P and the negative polarity generation circuit 122N of the gradation voltage generation circuit 122 are controlled by the second polarity signal (PS2). The difference from the pixel inversion driving of the embodiment of FIG. 9C is only the difference in the location where the first polarity signal (PS1) becomes H / L. That is, it can be realized by changing only the function of the polarity control circuit 1232 without changing the output circuit 121 or the gradation voltage generation circuit 122. For example, the function of the polarity control circuit 1232 may be changed by setting data from the host controller 20 or the nonvolatile memory 124 in a register.
By the above, each polarity arrangement | positioning of R and G can be made into a checkered pattern, and each polarity arrangement | positioning of B and W can be made the same in the vertical direction. R and G are driven by dot inversion, and B and W are driven by column inversion.

<Modification 3>
The pseudo dot inversion driving according to the modification example (modification example 3) of the embodiment will be described below with reference to FIGS. 12A to 12C.
FIG. 12A is a diagram illustrating pseudo-dot inversion driving (odd frame) according to Modification 3. FIG. 12B is a diagram illustrating pseudo dot inversion driving (even number frames) according to Modification 3. FIG. 12C is a diagram illustrating an operation of pseudo dot inversion driving (odd frame) according to the third modification.
The difference from Modification 2 is that the polarities of B and W are reversed. As shown in FIGS. 12A and 12B, R and G in one pixel have different polarities, and for R and G, the polarity arrangement in a certain frame is checkered. B and W have the same polarity in the vertical direction. As shown in FIG. 12A, in the odd-numbered frame, both B and W are negative in the column of the source line S1, and both B and W are positive in the column of the source line S2. As shown in FIG. 12B, in an even frame, B and W are both positive in the column of source lines S1, and B and W are both negative in the column of source lines S2. As a result, B and W can be prevented from having the same polarity in a certain frame, and flicker due to a luminance difference between the polarities can be reduced.

Next, the pseudo dot inversion driving operation according to the modification example 3 will be described in comparison with the pixel inversion driving according to the example.
As shown in FIG. 12C, the pseudo dot inversion driving according to the third modification is similar to the dot inversion driving according to the second modification of FIG. 11C in accordance with H / L of the first polarity signal (PS1). 1216 and the switch 1215 are controlled, and the positive polarity generation circuit 122P and the negative polarity generation circuit 122N of the gradation voltage generation circuit 122 are controlled by the second polarity signal (PS2). The difference from the dot inversion driving of the second modification of FIG. 11C is only that the portion where the first polarity signal (PS1) is H / L and the portion where the second polarity signal (PS2) is H / L are different. It is. That is, it can be realized by changing only the function of the polarity control circuit 1232 without changing the output circuit 121 or the gradation voltage generation circuit 122. For example, the function of the polarity control circuit 1232 may be changed by setting data from the host controller 20 or the nonvolatile memory 124 in a register.
By the above, each polarity arrangement | positioning of R and G can be made into a checkered pattern, and each polarity arrangement | positioning of B and W can be made the same in the vertical direction. R and G are driven by dot inversion, and B and W are driven by column inversion.

  The overall configuration of the display device according to the example and the modification may be the configuration of the display device according to the comparative example as illustrated in FIG.

10, 10R ... display device 11, 11R ... display panel 12, 12a ... driver IC
12b ... Scanning circuit (SCC)
121 ... Output circuit (OC)
1211: Positive amplifier 1212: Negative amplifier 1213: Positive D / A converter (DACP)
1214 ... Negative electrode D / A converter (DACN)
1215, 1217 ... switch 1216 ... gradation data selection circuit (SLCTR)
122 ... gradation voltage generation circuit 122P ... positive polarity gradation generation part 122N ... negative polarity gradation generation part 123 ... logic circuit 1231 ... arithmetic circuit (ARC)
1232 ... Polarity control circuit (PCNT)
1233... Control register (CR)
124 ... Nonvolatile memory (NVM)
13B, 13W ... Pixel (pixel)
20 ... Host controller (HST)
AA, AR: Display area FA, FR: Peripheral area GL, X: Gate line (scanning line)
SL, Y ... Source line (video signal line)

Claims (20)

The display device
A plurality of first pixels;
A plurality of second pixels;
With
Each of the plurality of first pixels has a red sub-pixel, a green sub-pixel, and a blue sub-pixel arranged in the column direction,
Each of the plurality of second pixels includes a red subpixel, a green subpixel, and a white subpixel arranged in the column direction,
Each of the plurality of first pixels and each of the plurality of second pixels are arranged adjacent to each other in a row direction and a column direction,
The red sub-pixels of the first and second pixels are arranged in the same row;
The green subpixels of the first and second pixels are arranged in the same row;
The blue subpixel of the first pixel and the white subpixel of the second pixel are arranged in the same row,
The first and second pixels are driven so that the polarities of the red subpixel and the green subpixel are in a checkered arrangement in each color,
The blue subpixel of the first pixel and the white subpixel of the second pixel are driven so as to have the same polarity in the column direction or the row direction. The display device according to claim 1.
The red sub-pixel and the green sub-pixel of the first and second pixels are driven by pixel inversion,
The blue subpixel of the first pixel and the white subpixel of the second pixel are driven by column inversion. The display device according to claim 2 further includes:
A first source line;
A second source line;
A driver IC;
Have
The first source line is connected to a pixel arranged in a first column of the plurality of first and second pixels;
The second source line is connected to a pixel arranged in a second column of the plurality of first and second pixels;
The driver IC is
An output circuit connected to the first and second source lines;
A gradation voltage generating circuit connected to the driving circuit;
Have The display device according to claim 3.
The output circuit is
A first terminal connected to the first source line;
A second terminal connected to the second source line;
A switch connected to the first and second terminals;
A positive amplifier connected to the switch;
A negative amplifier connected to the switch;
A positive DA converter connected to the positive amplifier;
A positive DA converter connected to the positive amplifier;
With
Based on the first polarity signal, the polarities of the first and second source lines are controlled. The display device according to claim 4.
The gradation voltage generation circuit includes:
A positive tone generator,
A negative tone generator,
With
Based on the second polarity signal, the polarities of the blue pixel and the white pixel are controlled. The display device
A display area;
A peripheral area on the outer periphery of the display area;
With
In the display area,
First, second, third, fourth, fifth and sixth gate lines extending in a first direction;
First and second source lines extending in a second direction different from the first direction;
A first pixel;
A second pixel disposed adjacent to the first pixel in the first direction;
A third pixel disposed adjacent to the first pixel in the second direction;
A fourth pixel disposed adjacent to the third pixel in the first direction;
Have
The first pixel has a red sub-pixel, a green sub-pixel, and a blue sub-pixel,
The second pixel has a red sub-pixel, a green sub-pixel, and a white sub-pixel,
The third pixel has a red sub-pixel, a green sub-pixel, and a white sub-pixel,
The fourth pixel has a red sub-pixel, a green sub-pixel, and a blue sub-pixel,
The first and third pixels are connected to the first source line;
The second and fourth pixels are connected to the second source line;
The red subpixel and the green subpixel of the first, second, third, and fourth pixels are pixel-inverted and driven,
The blue subpixel and the second and third white subpixels of the first and fourth pixels are driven by column inversion. The display device according to claim 6.
The polarities of the red pixel, the green subpixel, and the blue subpixel of the first pixel are the same,
The red pixel, the green sub-pixel, and the white sub-pixel of the second pixel have the same polarity,
The polarity of the red pixel and the green subpixel of the third pixel is different from the polarity of the white subpixel,
The polarities of the red pixel and the green subpixel of the fourth pixel are different from the polarities of the blue subpixel. The display device according to claim 7.
A driver IC in the peripheral area;
The driver IC is
An output circuit connected to the first and second source lines;
A gradation voltage generating circuit connected to the driving circuit;
Have The display device according to claim 8.
The output circuit is
A first terminal connected to the first source line;
A second terminal connected to the second source line;
A switch connected to the first and second terminals;
A positive amplifier connected to the switch;
A negative amplifier connected to the switch;
A positive DA converter connected to the positive amplifier;
A positive DA converter connected to the positive amplifier;
With
Based on the first polarity signal, the polarities of the first and second source lines are controlled. The display device according to claim 9.
The gradation voltage generation circuit includes:
A positive tone generator,
A negative tone generator,
With
Based on the second polarity signal, the polarities of the blue pixel and the white pixel are controlled. The display device according to any one of claims 6 to 10,
The first and second pixels are connected to the first, second and third gate lines;
The third and fourth pixels are connected to the fourth, fifth and sixth gate lines;
The blue subpixel of the first pixel and the white subpixel of the second pixel are connected to the third gate line,
The white subpixel of the third pixel and the blue subpixel of the fourth pixel are connected to the sixth gate line. The display device according to any one of claims 6 to 10,
The red, green, blue, and white subpixels have a stripe shape in which the length in the first direction is longer than the length in the second direction in plan view. The display device according to any one of claims 6 to 10,
The display device has a rectangular shape in which the length in the first direction is longer than the length in the second direction in plan view. The display device according to claim 6.
The polarity of the red pixel and the green subpixel of the first pixel is different from the polarity of the blue subpixel,
The polarity of the red pixel and the green subpixel of the second pixel is different from the polarity of the white subpixel,
The polarities of the red pixel, the green subpixel, and the white subpixel of the third pixel are the same,
The polarities of the red pixel, the green subpixel, and the blue subpixel of the fourth pixel are the same. The display device according to claim 14, wherein
A driver IC in the peripheral area;
The driver IC is
An output circuit connected to the first and second source lines;
A gradation voltage generating circuit connected to the driving circuit;
Have The display device of claim 15,
The output circuit is
A first terminal connected to the first source line;
A second terminal connected to the second source line;
A switch connected to the first and second terminals;
A positive amplifier connected to the switch;
A negative amplifier connected to the switch;
A positive DA converter connected to the positive amplifier;
A positive DA converter connected to the positive amplifier;
With
Based on the first polarity signal, the polarities of the first and second source lines are controlled. The display device according to claim 16, wherein
The gradation voltage generation circuit includes:
A positive tone generator,
A negative tone generator,
With
Based on the second polarity signal, the polarities of the blue pixel and the white pixel are controlled. The display device according to any one of claims 14 to 17,
The first and second pixels are connected to the first, second and third gate lines;
The third and fourth pixels are connected to the fourth, fifth and sixth gate lines;
The blue subpixel of the first pixel and the white subpixel of the second pixel are connected to the third gate line,
The white subpixel of the third pixel and the blue subpixel of the fourth pixel are connected to the sixth gate line. The display device according to any one of claims 14 to 17,
The red, green, blue, and white subpixels have a stripe shape in which the length in the first direction is longer than the length in the second direction in plan view. The display device according to any one of claims 14 to 17,
The display panel has a rectangular shape in which the length in the first direction is longer than the length in the second direction in plan view.

Images