WO2007129425A1

WO2007129425A1 - Liquid crystal display device

Info

Publication number: WO2007129425A1
Application number: PCT/JP2006/325364
Authority: WO
Inventors: Kazuhiro Nakanishi
Original assignee: Sharp Kabushiki Kaisha
Priority date: 2006-05-08
Filing date: 2006-12-20
Publication date: 2007-11-15

Abstract

The present invention can be applied to a liquid crystal display device in which one pixel is formed by four or more sub pixels and dot-reversed display is performed. In a source driver (81) having individual drivers (81a), an adjacent individual driver (81a) outputs a signal (S6) of a different polarity. On a liquid crystal panel (10), pixels (14) each formed by four sub pixels (13): red (R), green (G), blue (B), and white (W) arranged in the same order are arranged on a plane. A signal line (22) is arranged in each column of the pixels (14). The individual drivers (81a) are connected to the signal lines (22) by wires (88). However, for every five individual drivers (81a), there is a wire (88) which is not connected to the signal line (22). Thus, it is possible to reduce the horizontal stripes generated when only one-color sub pixels are displayed and improve the display quality of the liquid crystal display device.

Description

Specification

Liquid crystal display

Technical field

The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device in which one pixel has four or more subpixel forces.

Background art

[0002] Since liquid crystal display devices are thin and have low power consumption, they are widely used in office automation equipment such as personal computers, portable information terminal devices such as electronic notebooks and mobile phones, camera-integrated VTRs, and televisions.

FIG. 18 shows a schematic diagram of a liquid crystal panel used in a conventional liquid crystal display device. In the liquid crystal panel 110, the sub-pixels 113 are arranged in a matrix. In the row direction (horizontal direction in the drawing), sub-pixels 113 of red (R), green (G), and blue (B) are repeatedly arranged in this order, and the same color in the column direction (vertical direction in the drawing). Sub-pixels 113 are arranged. One pixel 114 is composed of three-color sub-pixels 113 arranged in series. In a liquid crystal display device in which the subpixel 113 has a liquid crystal panel 110 with three colors, when displaying white, the three colors R, G, and B are displayed simultaneously. It was difficult to control the color temperature, which is difficult to obtain.

[0004] Therefore, there is a liquid crystal display device in which white (W) sub-pixels are provided in addition to red (R), green (G), and blue (B) so that the brightness of white can be controlled independently. Proposed. FIG. 19 shows a schematic diagram of a liquid crystal panel 210 in which one pixel is composed of four subpixels. In the liquid crystal panel 210, in the same manner as the liquid crystal panel 110 in FIG. 18, the power of red (R), green (G), and blue (B) is added to white (W) in addition to the subpixels 213 arranged in a matrix. A sub-pixel 213 is provided. Specifically, four sub-pixels 213 of white (W), red (R), green (G), and blue (B) are repeatedly arranged in this order in the row direction, and the same color in the column direction. Sub-pixels 213 are arranged. One pixel 214 is composed of four sub-pixels 213 arranged continuously.

In addition, in order to prevent flicking force and crosstalk in a liquid crystal display device, driving that inverts the polarities of pixels (sub-pixels) adjacent in the vertical and horizontal directions, and so-called dot inversion driving. A source driver is used. 18 and 19 show a liquid crystal panel that performs dot inversion driving. In the figure, “+” and “one” shown in the subpixel 13 indicate the voltage of the electrode of the subpixel 213. Represents the polarity.

[0006] A liquid crystal display device having four color sub-pixels is disclosed in Patent Document 1, for example, and a liquid crystal display device that performs dot inversion display is disclosed in Patent Document 2, for example.

Patent Document 1: JP-A-11-295717 (Page 5, Figure 1)

Patent Document 2: Japanese Patent Laid-Open No. 2003-295157 (Page 5, Figure 1)

Disclosure of the invention

Problems to be solved by the invention

However, in a liquid crystal display device having four color sub-pixels, when dot inversion display as proposed in Patent Document 2 is performed using a conventional source driver that performs dot inversion driving, one color sub-pixel is displayed. There is a problem that a striped pattern appears when monochrome display using only pixels is performed. This point will be described with reference to FIG. 20 and FIG.

FIGS. 20 and 21 illustrate cases where only the red (R) subpixels 113 and 213 are displayed on the liquid crystal panels 110 and 210. Display! /, NA! /, And subpixels 113 and 213 should be hatched! /. As shown in FIG. 20, in the three-color liquid crystal panel 110 with sub-pixels 113, “+” and “” sub-pixels 113 are alternately arranged in the row direction during single color display. That is, since the dot inversion driving state is maintained, the display on the liquid crystal panel 110 is good.

On the other hand, in the sub-pixel 213 color liquid crystal panel 210, as shown in FIG. 21, sub-pixels 213 having the same polarity are arranged in the row direction. When the sub-pixels 213 having the same polarity are aligned in the row direction in this way, a stripe pattern extending in the row direction, that is, a horizontal stripe pattern appears in FIG. This problem is not limited to the case where the sub-pixels are four colors, but the same is true for even-numbered colors.

Means for solving the problem

[0010] Therefore, according to the present invention, a striped pattern does not appear even when a single color display using only one sub-pixel is performed using a source driver capable of dot inversion driving! /, And high-quality display is possible. An object of the present invention is to provide a liquid crystal display device having even-numbered sub-pixels of four or more colors.

[0011] In order to achieve the above object, the present invention provides a color image of different colors arranged in a plane. A signal is transmitted to the pixel through a liquid crystal panel having a plurality of sub-pixel power pixels provided with a filter, a signal line disposed in each column of the sub-pixel, and a wiring connected to the signal line. And a liquid crystal display device comprising a source driver having a plurality of individual drivers for driving the display of the liquid crystal panel, wherein n pixels are evenly arranged in a direction parallel to the direction in which the signal lines are arranged The sub-pixel force is the same, the arrangement of the sub-pixels is the same in each of the pixels, the polarities of the outputs of the adjacent source drivers are different, and the individual driver is an arbitrary natural number multiple of n 1 The connection with the wiring is omitted for every m added, and is not connected with the signal line. According to this configuration, when a single color display is performed in which only a sub-pixel including a certain color filter is displayed, the sub-driver connected to the individual driver adjacent to the individual driver in which the wiring is omitted is provided. The polarity is reversed in the pixels having pixels.

The present invention is also characterized in that, in the liquid crystal display device having the above configuration, the m is constant.

[0013] Further, the present invention provides the liquid crystal display device having the above-described configuration, wherein the signal line includes a, the source driver includes b individual drivers and the source driver includes c source drivers, and the m is 111. = 11 £ 1001 :： ((& 711) 7 ^ ₍ : One &)) + 1. Here, floor (x) is a function called a floor function, and is a function that returns a maximum integer not exceeding X, that is, a maximum integer less than or equal to X.

In the liquid crystal display device having the above-described configuration, the present invention is characterized in that the n is 4 and the m is 5.

Further, according to the present invention, in the liquid crystal display device having the above-described configuration, a plurality of the sub-pixels constituting one pixel are arranged in a direction perpendicular to the direction in which the signal lines are arranged. And features.

According to the present invention, in the liquid crystal display device having the above configuration, the sub-pixels constituting one of the pixels are four including the color filters of red, green, blue, or white. Features.

In the liquid crystal display device having the above-described configuration, the present invention provides the source driver and the wiring force S on the flexible substrate, and omits the wiring on the flexible substrate. It is characterized by.

[0018] Further, the present invention is characterized in that the wiring is provided on the liquid crystal panel, and the wiring is omitted on the liquid crystal panel.

In the liquid crystal display device having the above-described configuration, the present invention is characterized in that the source driver is provided on the liquid crystal panel. The invention's effect

[0020] According to the present invention, in the case of performing monochromatic display using only one color sub-pixel, the sub-pixel connected to the individual driver adjacent to the individual driver in which the wiring is omitted is provided. Since the polarity of the sub-pixel displayed on the pixel is inverted, the occurrence of a striped pattern at that portion can be suppressed, and the display quality of the liquid crystal display device can be improved.

In addition, according to the present invention, by making the interval m between the individual drivers not connected to the signal lines constant, the occurrence of stripes can be made equal, and the display on the liquid crystal display device can be easily viewed. Can be. In addition, by setting m = n X floor ((a / n) Z (b X c- a)) + 1, the occurrence of striped patterns can be evenly spaced throughout the liquid crystal panel, and the display can be seen more. It can be easy. Furthermore, since n = 4 and m = 5, the polarity of adjacent subpixels of the same color in the entire liquid crystal panel is inverted, so that the occurrence of striped patterns can be suppressed as a whole.

Further, according to the present invention, the source driver and the wiring are provided on the flexible substrate, and the wiring is omitted on the flexible substrate. Accordingly, the liquid crystal panel having the conventional configuration is used. can do.

[0023] Further, according to the present invention, a wiring board is provided on a liquid crystal panel, and the wiring is omitted on the liquid crystal panel. The thing of the structure of can be used.

Brief Description of Drawings

[0024] FIG. 1 is a schematic configuration diagram of a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of a liquid crystal display device that is useful in an embodiment of the present invention.

[Figure 3] Partial plan view of LCD panel [Fig.4] Sectional view along line 4-4 in Fig. 3

[5] Detailed schematic diagram of a liquid crystal display device useful for an embodiment of the present invention

FIG. 6 is a plan view of a flexible substrate according to an embodiment of the present invention.

[7] Partial plan view of a TFT substrate according to an embodiment of the present invention

FIG. 8 is a block diagram of a control unit that works according to an embodiment of the present invention.

9] Partial schematic configuration diagram of the liquid crystal display device according to the embodiment of the present invention

[Figure 10] Data string timing chart

[Figure 11] Schematic diagram of data column

圆 12] Schematic diagram of a liquid crystal display device useful for an embodiment of the present invention

[FIG. 13] A schematic diagram of a liquid crystal display device according to an embodiment of the present invention in a monochromatic display state. 圆 14] A schematic diagram of a liquid crystal display device according to another aspect of an embodiment of the present invention. 圆 15A] Implementation of the present invention Schematic diagram of a pixel that works on another aspect of the form

[15B] Schematic diagram of a pixel that works in another aspect of the embodiment of the present invention

圆 16] Schematic diagram of a pixel that works in another aspect of the embodiment of the present invention

圆 17] Schematic diagram of a liquid crystal display device according to another aspect of the embodiment of the present invention

[Figure 18] Schematic diagram of a conventional liquid crystal panel with 3 sub-pixels

[Figure 19] Schematic diagram of a conventional liquid crystal panel with 4 sub-pixels

[Fig.20] Schematic diagram of a liquid crystal panel with 3 sub-pixels in a single color display state

[Fig. 21] Schematic diagram of a liquid crystal panel with 3 sub-pixels in a single color display state.

1 Liquid crystal display

10 LCD panel

13 Subpixel

14 pixels

20b wiring

22 Signal line

42 Colorfinoleta

81 Source driver 85 Flexible substrate

88 Wiring

81a Individual driver

BEST MODE FOR CARRYING OUT THE INVENTION

[0026] An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a liquid crystal display device according to an embodiment of the present invention, and FIG. 2 is a schematic diagram of the liquid crystal display device.

As shown in FIG. 1, the liquid crystal display device 1 includes a liquid crystal panel 10 as a display member, a driving device 80 for the liquid crystal panel 10, and a backlight device 70 that irradiates the liquid crystal panel 10. In other words, it is a so-called transmissive liquid crystal display device. In FIG. 2, etc., the backlight device 70 is omitted.

The liquid crystal panel 10 is roughly divided into a display area 11 in which the sub-pixels 13 are arranged and a non-display area 12 that is an area other than the display area 11. In the liquid crystal panel 10, as shown in FIG. 2, the non-display area 12 is provided so as to surround the display area 11 in a plan view of the liquid crystal panel 10. The display area 11 and the non-display area 12 are not only a two-dimensional area in a plan view of the liquid crystal panel 10, but also the two-dimensional area facing the thickness direction of the liquid crystal panel 10, that is, a TFT substrate 20 described later. It also refers to the three-dimensional area of the liquid crystal panel 10 that is projected and grasped in the stacking direction of the substrates 40 (see Fig. 4).

[0029] As shown in FIG. 2, each sub-pixel 13 has one of four colors of red (R), green (G), blue (B), and white (W), that is, one of the four colors. Display color. In the figure, “R” indicates that the display color of the sub-pixel 13 is red, and similarly “G”, “B”, and “W” are green, blue, and white, respectively. Indicates. The plurality of subpixels 13 are aligned in each of the first direction dl and the second direction d2 orthogonal to each other, that is, two-dimensionally arranged in a matrix. In this example, the first direction dl is directed to the screen of the liquid crystal panel 10 in the row direction (horizontal direction), and the second direction d2 is directed to the screen in the column direction (vertical direction).

[0030] In the first direction dl, red (R), green (G), blue (B), and white (W) sub-pixels 13 are repeatedly arranged in this order, that is, these four colors are one unit. As shown, sub-pixels 13 of each color are repeatedly arranged. Then, sub-pixels 13 of the same color are arranged in the second direction d2. It should be noted that the four-color sub-pixels 13 arranged in succession in the first direction dl are pixels 14 as one unit for color display. In FIG. 2, one pixel 14 is surrounded by a thick line for the sake of explanation. The same applies to FIGS. 12 to 14 described later.

Next, the structure of the liquid crystal panel will be described with reference to FIGS. 3 and 4. 3 is a partial plan view of the liquid crystal panel, and FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. As shown in FIG. 4, the liquid crystal panel 10 includes a TFT (Thin Film Transistor) substrate 20, a counter substrate 40 disposed opposite to the TFT substrate 20, and a liquid crystal sealed between the TFT substrate 20 and the counter substrate 40. Includes 50 and. The “TFT substrate” is also called a TFT array substrate, an array substrate, an active substrate, a matrix substrate, an active matrix substrate, or the like.

As shown in FIGS. 3 and 4, the TFT substrate 20 includes a transparent insulating substrate 21, a circuit layer disposed on the transparent insulating substrate 21, and an alignment film 28 disposed on the circuit layer. Is included. The circuit layer described above includes the signal line 22, the scanning line 23, the TFT 24, the subpixel electrode 25, the auxiliary capacitance line 26, and the insulating layer 27. The TFT 24 operates as a switching element and includes a semiconductor layer 24c and a drain electrode 24d. The insulating layer 27 insulates the signal line 22, the scanning line 23, the semiconductor layer 24c, the drain electrode 24d, the sub-pixel electrode 25, and the auxiliary capacitance line 26 so as to form a predetermined circuit. In FIG. 3, the sub-pixel electrode 25 is indicated by a broken line in order to make the drawing easy to see.

Specifically, each signal line 22 extends in the second direction d2 in the display region 11, and the plurality of signal lines 22 are arranged in the first direction dl in the display region 11. In addition, a plurality of scanning lines 23 are provided so as to intersect these signal lines 22 vertically (three-dimensional intersection). That is, each scanning line 23 extends in the first direction dl in the display area 11, and these scanning lines 23 are arranged in the second direction d 2 in the display area 11. A TFT 24 is provided at each intersection of the signal line 22 and the running line 23. Near the intersection, the protruding portion of the signal line 22 forms the source electrode 24a of the TFT 24, and the protruding portion of the scanning line 23 forms the gate electrode 24b of the TFT 24. A semiconductor layer 24c is disposed so as to face the gate electrode 24b, and a portion of the insulating layer 27 between the semiconductor layer 24c and the gate electrode 24b forms a gate insulating film. A source electrode 24a and a drain electrode 24d of the TFT 24 are electrically connected to the semiconductor layer 24c. In plan view, the gate electrode 24b is located between the source electrode 24a and the drain electrode 24d. The drain electrode 24d is connected to the scanning line 2 The auxiliary capacitor line 26 is arranged between the three layers and extends in the first direction dl, and is connected to the sub-pixel electrode 25 through the through hole 27a of the insulating layer 27. The sub-pixel electrode 25 is disposed in a region partitioned by the signal line 22 and the scanning line 23, and is close to the signal line 22 and the scanning line 23 at this time. The subpixel electrode 25 is disposed on the insulating layer 27, and the alignment film 28 is disposed on the insulating layer 27 so as to cover the subpixel electrode 25.

On the other hand, the counter substrate 40 includes a transparent insulating substrate 41, a color filter 42, a light shielding layer 43, a transparent electrode 44, and an alignment film 45, as shown in FIG. Note that a counter substrate having a color filter is also called a color filter substrate or the like.

The color filter 42 is disposed on the transparent insulating substrate 41 so as to face the subpixel electrode 25 of the TFT substrate 20 described above, and the display color of the subpixel 13 is determined by the color of the color filter 42. . That is, when the color filter 42 colors the light emitted from the backlight device 70 (see FIG. 1), display colors of red (R), green (G), blue (B), and white (W) can be obtained. . When the color of light emitted from the knocklight device 70 is the same as white (W) as the display color, the color filter 42 may not be provided for the white (W) sub-pixel 13. In the display area 11, a light shielding layer 43 is provided in a mesh shape so as to pass between adjacent color filters 42, in other words, so as to face (overlap) the signal line 22 and the scanning line 23 of the TFT substrate 20. ing. In FIG. 3, the light shielding layer 43 is hatched for easy viewing of the drawing. The light shielding layer 43 has a shape that also overlaps the TFT 24, and the non-display area 12 has a frame-like portion (not shown) surrounding the display area 11. A transparent electrode 44 is disposed so as to cover the color filter 42 and the light shielding layer 43, and the transparent electrode 44 extends over the entire display region 11. An orientation film 45 is disposed on the transparent electrode 44.

The TFT substrate 20 and the counter substrate 40 are arranged so that the alignment film 28 and the alignment film 45 face each other, and a liquid crystal 50 is sealed in a gap between the TFT substrate 20 and the counter substrate 40. A polarizing plate 29 and a polarizing plate 49 are arranged on the outer surfaces of the TFT substrate 20 and the counter substrate 40, respectively. A backlight device 70 is arranged on such a liquid crystal panel 10 so that light is irradiated on the TFT substrate 20 side (see FIG. 1). [0037] The structures illustrated in FIGS. 3 and 4 are merely examples, and other switching elements such as a MIM (Metal Insulator Metal) element may be used instead of TFT24. Filter ON • Color filter 42 may be provided on the TFT substrate 20 side like a TFT substrate.

In such a liquid crystal panel 10, the subpixel 13 includes a subpixel electrode 25, a TFT 24, a power color filter 42, and a portion of the transparent electrode 44 that faces the subpixel electrode 25. Made. At this time, as shown in the detailed schematic diagram of the liquid crystal display device of FIG. 5, the sub-pixel electrodes 25 are alternately arranged with the signal lines 22 in the first direction dl. The sub-pixel electrode 25 is connected to the adjacent signal line 22 (left side in FIG. 5) via the TFT 24, and the gate electrode 24b of the TFT 24 is connected to the adjacent scanning line 23 (lower side in FIG. 5). Yes. With such a connection form, the sub-pixel 13 is connected to the signal line 22 and the scanning line 23. At this time, a plurality of subpixels 13 arranged in the second direction d2 are connected to one signal line 22, and a plurality of subpixels 13 arranged in the first direction dl are connected to one scanning line 23. It is connected. Note that such a connection form of the sub-pixel electrode 25, the signal line 22 and the scanning line 23 is illustrated in a simplified manner in FIG. 2, and the same illustration method is used in the drawings described later. .

In the liquid crystal panel 10, as shown in FIGS. 2 and 5, the signal lines 22 and the scanning lines 23 further extend to the non-display area 12 while maintaining the arrangement order in the display area 11. The The ends of each signal line 22 and each scanning line 23 in the non-display area 12 form an input end of the liquid crystal panel 10, and each input end is connected to the driving device 80 via a wiring 88.

As shown in FIG. 5, the drive device 80 includes a source driver 81, a gate driver 82, and a control unit 83.

The source driver 81 is a device that outputs a drive signal S6 to be applied to each signal line 22, and includes a plurality of individual drivers 81a provided in parallel. The individual drivers 81a are numbered or numbered, and in the drawing, the individual drivers 81a are shown in the order of the numbers, and here, the numbers are numbered 1, 2,... From the left side of the drawing. The output terminal of the individual driver 81a is connected to the signal line 22 of the TFT substrate 20 via the wiring 88, whereby the drive signal S6 output from the individual driver 81a is applied to the signal line 22. As will be described later, in the embodiment of the present invention, the number of pieces of dummy data received from the control unit 83. The wiring 88 of the separate driver 81a is not connected to the signal line 22. The output timing of the scanning signal S5 is controlled by the gate driver control signal S3 output from the control unit 83.

Here, the connection between the individual driver 81a of the source driver 81 and the signal line 22 will be described. In this embodiment, the source driver 81 is formed on a film-like flexible substrate 85 as a so-called COF (Chip On Film) structure as shown in the plan view of the flexible substrate on which the source driver of FIG. 6 is formed. The input terminal 86 for receiving a signal from the control unit 83 and the output terminal 87 for outputting a signal to the signal line 22 are connected by a wiring 88. Further, as shown in the partial plan view of the TFT substrate in FIG. 7, the signal line 22 is connected to the input terminal 20a provided so as to be exposed at the end of the TFT substrate 20 for receiving the signal from the source driver 81. Connected with 20b. In FIG. 7, the other components of the circuit layer are not shown.

Note that the source driver 81 may be replaced with the flexible substrate 85 and may have a TAB (Tape Automated Bonding) structure formed on a tape. Further, the source driver 81 may have a COG (Chip On Glass) structure provided on the TFT substrate 20, and the source driver 81 and the control unit 83 may be connected by wiring provided on the flexible substrate.

In this embodiment, the wiring 88 or 20b of the individual driver 8 la that is not connected to the signal line 22 may be interrupted on the flexible board 85 as shown in FIG. Even if it is broken on the TFT substrate 20. If it is assumed that there is an interruption on the flexible substrate 85, the TFT substrate 20 has a conventional structure in which all wiring 20b on the TFT substrate 20 connects the input terminal 20a and the signal line 22 without changing the design. Available . On the other hand, when it is assumed that there is an interruption on the TFT substrate 20, the conventional structure in which all the wirings 88 on the flexible substrate 85 connect the individual driver 81a and the output terminal 87 can be used without changing the design. In the case of the COG structure, the conventional structure can be used as a flexible substrate if the wiring 20b is cut off on the TFT substrate 20. In FIG. 6 and FIG. 7, the wiring 88 or 20b that does not connect the signal line 22 and the individual driver 81a may be omitted completely or may be omitted.

In addition, the gate driver 82 is a device that outputs a scanning signal S5 applied to each scanning line 23. Thus, it is connected to the scanning line 23 of the liquid crystal panel 10 through the wiring described above. As a result, the scanning signal S5 from the gate driver 82 is applied to the scanning line 23. The output timing of the scanning signal S5 is controlled by a gate driver control signal S3 output from the control unit 83.

Next, FIG. 8 shows a more specific block diagram of the control unit. As shown in FIG. 8, the control unit 83 includes a data generation unit 83a and a timing control unit 83b. The data generator 83a obtains red (R), green (G) and blue (B) data rO, gO, bO and a clock signal CK of the display image, and from these three color data r0, gO and bO. White (W) gradation data (gradation data string) W0 is generated and output. In addition, the data generation unit 83a uses the above three-color data r0, gO, and bO for the gradation data of red (R), green (G), and blue (B) so as to suit the color display characteristics of the liquid crystal panel 10. (Gradation data string) Convert to R0, GO and BO and output. Further, the data generation unit 83a generates and outputs a dummy data string DO for the individual driver 81a that is not connected to the signal line 22 described above. This dummy data string DO has nothing to do with the display image data r0, g0, bO. On the other hand, the timing control unit 83b acquires the synchronization signal and the clock signal CK, and generates and outputs the control signal S2 for the source driver 81 and the control signal S3 for the gate driver 82 based on the synchronization signal. The timing control unit 83b generates and outputs a control signal S4 (trigger signal indicating the start and end of operation) for the data generation unit 83a.

[0047] Then, the source driver 81 sequentially receives the data R0, G0, B0, WO and DO! /, And when the data R0, G0, B0, WO and DO for all the signal lines 22 are obtained, In synchronization with the selection timing of the scanning line 23 by the gate driver 82, the respective drive signals S6 are simultaneously applied to all the signal lines 22.

Here, referring to the partial schematic configuration diagram of the liquid crystal display device in FIG. 9, the timing chart in FIG. 10, and the schematic diagram of the data string in FIG. 11, the control unit 83 and the source driver 81 in the liquid crystal display device 1 The process will be described more specifically. As shown in the individual driver 81a in FIG. 9, the individual driver 81a has the above-mentioned numbers, and the gradation data XI to X20 are sequentially input (in the drawing, the left force is also in the first direction dl). It shall be received.

[0049] As described above, the source driver 81 has gradation data (data string) RO, GO, BO, WO, dummy. Data (data string) D0, sync signal SI and clock signal CK are received. At this time, as shown in the timing chart of FIG. 10, the gradation data string RO is a data string composed of gradation data Rl, R2, R3,... Synchronized with the rising edge of the clock signal CK. The tone data ^ R1, R2, R3,... Are data relating to the gradation of the red (R) sub-pixel 13 in the first, second, third,. Also, the gradation data strings GO, BO, and WO are data strings relating to the gradation of the sub-pixel 13 of green (G), blue (B), and white (W), respectively, and the gradation data strings G0, B0, And the data structure of WO is the same as the above-mentioned gradation data string R0. The dummy data string DO is a data string composed of dummy data Dl, D2, D3,... That are unrelated to the gradation data strings R0, G0, BO, and WO. The four gradation data Rl, Gl, B1, and Wl make up display data for one pixel 14. The gradation data strings R0, G0, BO and WO for each color and the dummy data string DO are transmitted in parallel from the control unit 83 in synchronization with the clock signal CK. For this reason, the source driver 81 receives a parallel data sequence DA composed of five data sequences R0, G0, B0, WO and DO.

Then, the source driver 81 generates the drive signal S6 based on the received data strings RO, GO, BO, WO, and DO. At this time, as shown in the schematic diagram of the data string in FIG. 11, the source driver 81 uses the gradation data Rl, R2, R3, and R4 in the data string RO from the head as the gradation data 1, 6, 11 16 is supplied to the first, sixth, eleventh and sixteenth individual drivers 81a (see FIG. 9). Similarly, the source driver 81 receives the gradation data Gl, G2, G3, and G4 in the data string GO as gradation data X2, X7, XI 2 and XI 7 from the head, and the second, seventh, The grayscale data Bl, B2, B3 and B4 in the data string BO are received as grayscale data X3, X8, X13 and X18 from the top, respectively. The grayscale data W1, W2, W3 and W4 in the data string WO are supplied to the eighth, thirteenth and eighteenth individual drivers 8 la, respectively, and the grayscale data X4, X9, X14 and XI 9 from the beginning And supply to the 4th, 9th, 14th and 19th individual drivers 8 la respectively. In this embodiment, the signal line 22 is not connected to the wirings of the fifth, tenth, fifteenth and twentieth individual drivers 8 la. The individual driver 81a receives dummy gradation data X5, X10, XI5, and X20 supplied from the source driver 81 based on the dummy data string DO received from the control unit 83. The data string DO is independent of the gradation data strings RO, GO, BO, and WO, and does not affect the image displayed on the liquid crystal panel 10.

[0051] In this embodiment, the source driver 81 is a general-purpose driver configured such that the individual driver 81a performs dot inversion driving, and the gradation data XI, X2, X3, etc. received as described above Is output as either “+ (plus or positive)” drive signal S6 or “− (minus or negative)” drive signal S6, and adjacent individual driver 81a outputs drive signal S6 of opposite polarity To do. Then, the drive signal S6 is applied to all the signal lines 22 in synchronization with the selection timing of the scanning line 23 by the gate driver 82. With the next drive signal S6, gradation data of the same number is used so as to perform dot inversion drive. Is output as the opposite polarity of the previous polarity.

[0052] The drive signal S6, in other words, the gradation data RO, GO, BO and WO are applied to the sub-pixel electrode 25 via the TFT 24 connected to the signal line 22 and the selected scanning line 23, As a result, 13 pixels are supplied. The subpixel 13 is supplied with a voltage (potential) having a magnitude corresponding to the gradation data RO, GO, BO, or WO and having a “+” polarity or a “” polarity, and the next signal is applied to this voltage. Hold until For this reason, the polarity of the subpixel 13 is expressed by the polarity of the voltage applied to the subpixel electrode 25. For example, the “+” subpixel 13 means that the polarity of the subpixel electrode 25 of the subpixel 13 is “+”. Note that the polarities of the drive signal S6, the subpixel electrode 25, and the subpixel 13 are defined based on the potential of the transparent electrode 44.

Here, the polarity of the drive signal S6 applied to each signal line 22 will be described with reference to the schematic diagrams of the liquid crystal display device of FIGS. FIG. 13 shows a case where only the red (R) sub-pixel 13 is displayed, and the sub-pixel 13 is hatched. In the figure, the display colors (red (R), green (G), blue (B), and white (W)) are shown in the upper left of each sub-pixel 13 and the polarity is shown in the lower right as an example. Yes. Here, in order to make the explanation easy to understand, an example in which the sub-pixels 13 are 6 rows and 16 columns, the signal lines 22 are 16, and the individual drivers 81a are 20 is illustrated.

[0054] In this case, the signal lines 22 are divided into signal line groups 22a every four consecutive lines in the display area 11. Then, the red (R) sub-pixel 13 is connected to the first signal line 22 in each signal line group 22a (here, the first from the left in the first direction dl). Green (G), blue (B), and white (W) sub-pixels 13 are connected to the second to fourth signal lines 22 in the line group 22a, respectively. Such a connection form is the same for each row in the liquid crystal panel 10.

Similarly, five individual drivers 81a (that is, four that are the number of signal lines 22 belonging to the signal line group 22a are four, and one that is the number of individual drivers 8 la that receive the dummy data string). When divided into individual driver groups 81b by the same number), the individual driver group 81b and the signal line group 22a have a one-to-one correspondence. At this time, as described above, in the liquid crystal panel 10, the signal lines 22 further extend to the non-display area 12 while maintaining the arrangement order in the display area 11, so the first (here, the first direction) The individual driver 81a (first from the left in dl) is connected in the non-display area 12 to the signal line 22 arranged first in the non-display area 12 via the wiring 88. This signal line 22 is displayed. Even in region 11, it is arranged first. Therefore, the first individual driver 81a in each individual driver group 81b outputs the drive signal S6 for the red (R) subpixel 13. Similarly, the second force in the individual driver group 81b and the fourth individual driver 81a are connected to the signal line 22 arranged first in the non-display area 12 and the display area 11, and are connected to green (G ), Blue (B) and white (W) sub-pixel 13 drive signals S6 are output. In addition, since the fifth individual driver 81a is not connected to the signal line 22 that outputs the dummy drive signal S6, the display on the liquid crystal panel 10 is not affected. In the figure, the color of the drive signal S6 output at the upper left in each individual driver 81a is shown, and the polarity of the drive signal S6 output at the lower right is shown. The dummy drive signal is indicated by D.

[0056] As illustrated in FIG. 12, the source driver 81 outputs a drive signal S6 in which the first individual driver 8 la of the first and third, that is, odd-numbered individual driver groups 8 lb is “+”. In this case, the first individual driver 81a of the second and fourth, that is, even-numbered individual driver group 81b is configured to output a "one" drive signal S6. In addition, when the first individual driver 8 la of the odd-numbered individual driver group 8 lb outputs the drive signal S6 of “-”, the first individual driver 81a of the even-numbered individual driver group 81b is “ + "Drive It is configured to output signal S6.

[0057] In addition, in view of the point that the individual drivers 81a are numbered as described above and the individual drivers 81a are arranged in the order of the numbers in the drawing, the assigned numbers (order) are consecutive. Individual driver 81a is expressed as “adjacent individual driver 81a”.

Therefore, in the liquid crystal display device 1, in the odd-numbered signal line group 22a, “+” (to the signal line 22 arranged in the sth (s is a natural number of 1 to 4) in the display region 11 is displayed. (Or “one”) when the drive signal S6 is applied, the signal line 22 arranged in the sth in the display region 11 in the even-numbered signal line group 22a has “” (or “ +)) Drive signal S6 is applied.

As a result, according to the liquid crystal display device 1 configured as described above and the driving method of the liquid crystal panel 10 in the liquid crystal display device 1 described above, the polarities of the sub-pixels 13 of the same color arranged in the first direction dl are odd The sub-pixel 13 connected to the signal line group 22a may be different from the sub-pixel 13 connected to the signal line group 22a connected to the even-numbered signal line group 22a. In the above example, since the even-numbered signal line group 22a and the odd-numbered signal line group 22a have the same number, the “+” subpixel and the “one” subpixel have the same number for the subpixel 13 of the same color. Mixed (distributed) in a one-to-one ratio in one-way dl. In this way, it is possible to prevent subpixels 13 of the same color arranged in the first direction dl, that is, in the horizontal direction from having the same polarity next to each other, so when only one subpixel 13 is displayed. The generated horizontal stripe pattern can be reduced and the display quality of the liquid crystal display device 1 can be improved.

Here, as shown in the schematic diagram of the liquid crystal display device of FIG. 14, the signal line group 22a is defined for every eight continuous lines in the display region 11 of the signal lines 22, that is, for every two pixels 14. The above-described configuration is applied to the case where the individual driver group 81b is defined for every nine consecutive drivers, and one of the individual driver groups 81b is not connected to the sub-pixel 13 and receives dummy grayscale data. It's okay. In this case, the 19th and 20th individual drivers 8 la that do not belong to the individual driver group 8 lb also receive dummy gradation data.

[0061] Furthermore, the number n of sub-pixels 13 constituting one pixel 14 arranged in the first direction dl (here n

= 4) A signal line group 22a is defined for each number of natural multiples, and this signal line group 22a is configured. The above effect can also be obtained when it is sufficient to define the individual driver group 81b for each m of the signal lines 22 plus 1 and apply the above configuration. Figure 14 shows the case where m = 9 and n = 4 is a natural number of 2.

Further, in the present embodiment, the same effect of reducing the horizontal stripe pattern can be obtained when an even number of subpixels constituting one pixel are arranged in the first direction dl, that is, when n is an even number. It is done. Examples of such pixels are shown in FIGS. 15A and 15B. FIG. 15A and FIG. 15B are examples of pixels in which an even number of sub-pixels 13 constituting one pixel are arranged in the first direction dl. When n is an odd number, horizontal stripes do not occur when only one color subpixel is displayed.

FIG. 15A shows a pixel composed of six subpixels 13 of red (R), green (G), blue (B), yellow (Y), magenta (M), and cyan (C). There are 6 or even 13 13 in the first direction dl. In this case, n = 6 for the number m described above, and the dummy data is received without connecting to the signal line 22 every m-th of the individual driver 81a. A pattern reduction effect can be obtained. For example, for natural number power ^ m = 6 X 1 + 1 = 7, 7th, 14th, ... ゝ For natural number power m = 6 X 2+ 1 = 13, 13th, 26th ... Applicable when driver 8 la is not connected to signal line 22.

[0064] FIG. 15B shows four subpixels 13 of red (R), green (G), blue (B), and white (W) in two rows and two columns, that is, two in the first direction dl. It is a pixel composed of two in two directions d2. Also in this case, an even number of subpixels 13 are arranged in the first direction dl. In this case, n = 2 for the above-mentioned number m, and it is not connected to the signal line 22 every m-th of the individual driver 81a, and dummy gradation data is received, so that it is the same as the above case. In addition, the effect of reducing the horizontal stripe pattern can be obtained. For example, if the natural number is 1, m = 2 X 1 + 1 = 3 and the 3rd, 6th, ... ゝ natural number power m = 2 X 2+ 1 = 5, 5th, 10th, etc. Applicable to driver 81a not connected to signal line 22. In this case, in order to display one pixel 14, it is necessary to scan two sub-pixels 13 arranged in the second direction d2, that is, two rows.

[0065] Regardless of the value of n, since the number of signal line groups 22a is maximized when the natural number multiplied by n is 1, the same color sub-pixel 13 having the opposite polarity is moved in the first direction dl Alternatingly Can. For this reason, the reduction effect of the above-mentioned horizontal stripe pattern becomes the most remarkable.

In the present embodiment, the arrangement of the individual drivers 8 la not connected to the signal line 22 is not limited to the m-th left end force in the first direction dl. m 1) It is also possible to start the arrangement from the deviation and place every mth force. In FIG. 16, as an example, the fourth, ninth, fourteenth, and nineteenth individual drivers 81a are not shown connected to the signal line 22, and are shown in this case.

[0067] The power described for the case where there is one source driver 81 As described above, a plurality of source drivers 81 may be provided as described below in this embodiment.

As shown in FIG. 17, a plurality of flexible boards 85 provided with source drivers 81 are arranged in a line in the first direction dl, and a plurality of flexible boards 85 are connected to the liquid crystal panel 10. Each source driver 81 is connected to a control unit 83 (not shown in FIG. 17).

Here, as an example, a case where eleven source drivers 81 including 384 individual drivers 81a are provided and the liquid crystal panel 10 has 4096 subpixels 13 arranged in the first direction dl will be described. In this case, the same number of 4096 signal lines 22 as the sub-pixels 13 arranged in the first direction dl are arranged, and 4096 + 4 = 1024 columns of pixels 14 are arranged in the first direction dl.

In this case, 384 × 11 = 4224 individual drivers 81 a are provided, and 4224−4096 = 128 power surpluses for 4096 signal lines 22. In other words, there are 128 individual drivers 81a that receive a dummy data string from the control unit 83 and are not connected to the signal line 22. By arranging the individual driver 81a for receiving dummy data as described above, the effect of reducing the horizontal stripe pattern can be obtained.

As an arrangement method of the individual driver 8 la that receives dummy data, for example, a method in which the individual driver 8 la is biased in one direction in the first direction d 1 and a method in which the entire driver is distributed in an average manner are cited.

[0072] When the first direction dl is biased to the left end, an individual driver 81a that is not connected to the signal line 22 is arranged every fifth left end force of the individual driver 81a. In this case, the individual driver 81a that is not connected to the signal line 22 is arranged from the left end to the 640th. In the first direction dl, the individual driver 81a that is not connected to the signal line 22 is arranged only in the first and second source drivers 81 from the left end, and from the left end of the pixels 14 to the 160th column in the liquid crystal panel 10. The occurrence of horizontal stripes can be greatly reduced. But the rest is horizontal stripes The pattern cannot be reduced.

[0073] When the average is dispersed throughout, it is not possible to greatly reduce the occurrence of horizontal stripe patterns, but since it can be reduced to the whole, some can be greatly reduced, but the rest is not at all. The image displayed on the liquid crystal panel 10 can be easily seen compared to the case. In this case, if the individual drivers 81a not connected to the signal line 22 are arranged every 1028 + 128 = 8 from the left end of the 1028 pixels 14, the dispersion can be most achieved. That is, the left end force of the individual driver 81a can be most dispersed if the individual driver 81a is arranged without being connected to the signal line 22 every 8 × 4 + 1 = 33.

Next, the arrangement of the individual driver 81a not connected to the signal line 22 will be specifically described. The left side force of the source driver 81 in the first direction dl is also set to sdl, sd2,... Sdl l in order, and the individual driver 81a of each source driver 81 is also set to Tl, Τ2,. The individual driver 8 la that is not connected to the signal line 22 is every 33rd in the source driver sdl, that is, every 11th of T33, T66,. Thirty-third T12 forces including T45, T78, ... ゝ 375 12 pieces including 21 pieces of sdl Τ364 force Τ384 and so on. Saucedoraino In sd3, sd2's Τ376 force, Τ384, and ninety-eight occasions, including the 33rd Τ24 force, Τ57, Τ90,… ゝ Τ354, 11 pieces.

[0075] Similarly, sd4 has Τ3, Τ36,… ゝ Τ366, twelve, sd5 has Τ15, Τ48,… ゝ Τ378, twelve, sd6 has Τ27, Τ60, ..., Τ357, eleven, sd7 has Τ6 , Τ39, ···, Τ369 12 pieces, sd8 Τ18, Τ51, "Τ381 12 pieces, d sd9 Τ30, Τ63, ... Τ 11360 11 pieces, sdlO Τ9, ゝ 42, ... Τ Τ372 12 pieces In sdl l, there are 12 pieces of Τ21, Τ54,… ゝ Τ384, and the total is 128 pieces.

In this case, the individual driver 81a not connected to the signal line 22 may be started every T1 to T32 instead of starting from T33 of the source driver sdl, and may be arranged every 33rd.

Next, an arrangement method in the case where the individual drivers 8 la that are not connected to the signal line 22 are dispersed on the whole will be described using mathematical expressions. The number of signal lines 22 is a, the number of individual drivers 81a per source driver 81 is b, the number of source drivers 81 is c, and the first direction of the sub-pixel 13 constituting one pixel 14 is the first direction. Let n be the number arranged in dl. At this time, the pixels 14 are arranged in aZn columns in the first direction dl, and there are b × c−a surplus individual drivers 81a. Therefore, when g = floor ((a / n) / (bXc-a)), the individual drivers 81a that are not connected to the signal lines 22 are arranged every g from the left end of the pixel 14. In other words, from the left end of the individual driver 8 la m = n X g + 1 = n X floor ((a / n) / (bXc-a)) + Individually connected to the signal line 22 every 1st If the driver 81a is arranged, it can be most dispersed. Here, floor (x) is a function called a floor function, and returns a maximum integer not exceeding X, that is, a maximum integer less than or equal to X. Also in this case, the arrangement of the individual driver 81a not connected to the signal line 22 is not limited to every m-th left end force in the first direction dl, and the first to (m-1) th from the left end of the first direction dl Arrangement may be started from either position and arranged every mth force.

[0079] In the above case, since a = 4096, b = 384, c = ll, and n = 4, m = nXg + l = nXfl oor ((a / n) / (bXc-a)) + 1 = 4X floor ((4096/4) Z (384 X 11—4096)) + 1 = 4X8 + 1 = 33.

Industrial applicability

The present invention can be applied to a liquid crystal display device in which one pixel has four or more subpixel forces.

Claims

The scope of the claims

[1] A liquid crystal panel having a plurality of subpixels having different color filters arranged in a plane and a signal line arranged in each column of the subpixels;

In a liquid crystal display device including a source driver having a plurality of individual drivers that transmit a signal to the pixel through a wiring connected to the signal line and perform display driving of the liquid crystal panel.

The pixel is composed of n subpixels arranged in an even number in a direction parallel to the direction in which the signal lines are arranged, and the arrangement of the subpixels is the same in each of the pixels, and the adjacent source drivers The polarity of the output of each is different, and the individual driver adds 1 to any natural number multiple of n, and the connection to the wiring is omitted every m times, and the individual driver is connected to the signal line. A liquid crystal display device.

2. The liquid crystal display device according to claim 1, wherein the m is constant.

[3] The signal line includes a, the source driver includes b the individual drivers, the source driver includes c, and the source driver includes c, and m is m = n X floor ((a / n) / (b 2. The liquid crystal display device according to claim 1, wherein X ca)) + 1.

4. The liquid crystal display device according to claim 1, wherein n is 4 and m is 5.

5. The liquid crystal display device according to claim 1, wherein a plurality of the sub-pixels constituting one pixel are arranged in a direction perpendicular to the direction in which the signal lines are arranged.

6. The liquid crystal display device according to claim 1, wherein the number of sub-pixels constituting one pixel is four including the color filters of red, green, blue or white.

7. The liquid crystal display device according to claim 1, wherein the source driver and the wiring are provided on a flexible substrate, and the wiring is omitted on the flexible substrate.

8. The liquid crystal display device according to claim 1, wherein the wiring is provided on the liquid crystal panel, and the wiring is omitted on the liquid crystal panel.

[9] The source driver may be provided on the liquid crystal panel.

8. A liquid crystal display device according to 8.