JP2009086262A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device, reduced in manufacturing cost by dot inversion using a conventional component. <P>SOLUTION: The device comprises a gate driver GD which selects a display pixel PX for each line, a source driver SD which supplies image signals to the display pixels PX selected by the gate driver GD, and a controller CRT which controls the gate driver GD and the source driver SD. The source driver SD includes a first driver SD1 disposed along one side of a display part DYP, and a second driver SD2 disposed along the other side E2 to face the one side E1 of the display DYP, and the controller CTR includes a timing controller TCTR which outputs the image signals to the first and second driver SD1 and SD2. The timing controller TCTR has alignment means TB1 and TB2 for aligning the image signals to be outputted to the first and second drivers SD1 and SD2 so as to be applied to the corresponding display pixels. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device, and more particularly to an active matrix type liquid crystal display device.

Conventional technology

  In general, a liquid crystal display device includes a liquid crystal display panel having a pair of substrates facing each other, that is, an array substrate and a counter substrate, and a liquid crystal layer sandwiched between the pair of substrates. The liquid crystal display panel has a display unit composed of a plurality of display pixels arranged in a matrix. The array substrate has pixel electrodes arranged corresponding to the plurality of display pixels, and the counter substrate has counter electrodes facing the pixel electrodes.

In recent years, high definition display devices are desired. In a high-definition liquid crystal display device, since the number of display pixels increases, the number of source drivers that drive these display pixels may increase. Conventionally, there has been proposed a liquid crystal display device that is arranged on both upper and lower sides of a liquid crystal display panel and that alternately outputs signals from a source driver dedicated to dot inversion driving on the upper side and lower side to realize driving of display pixels. (See Patent Document 1).
JP-A-10-187097

  However, when the source driver dedicated to dot inversion driving is arranged on the upper side and lower side of the display unit as described above, the source driver generally used for arrangement on either the upper side or the lower side of the display unit is changed. It was difficult to apply.

  The present invention has been made in view of the above-described problems. When source drivers are arranged on the upper side and the lower side of the display unit, the dot inversion driving or the like using commonly used components is performed. An object of the present invention is to provide a liquid crystal display device capable of realizing inversion driving.

  A liquid crystal display device according to an aspect of the present invention includes a pair of substrates facing each other, a liquid crystal layer sandwiched between the pair of substrates, a display unit including a plurality of display pixels arranged in a matrix, and the plurality of the plurality of substrates. A gate driver that selects each display pixel row; a source driver that supplies a video signal to the display pixel selected by the gate driver; and a controller that controls the gate driver and the source driver. Comprises a first driver arranged along one end side of the display unit, and a second driver arranged along the other end side opposite to one side of the display unit, and the controller includes the first driver A timing controller that outputs a video signal to one driver and the second driver, the timing controller including the first driver and the second driver; A video signal to be outputted to fine the second driver has a sequence means for sequence to be applied to the display pixels corresponding.

  According to the present invention, it is possible to provide a liquid crystal display device capable of realizing inversion driving such as dot inversion driving using commonly used components when source drivers are arranged on the upper and lower sides of a display unit. it can.

  Hereinafter, a liquid crystal display device according to an embodiment of the present invention will be described with reference to the drawings. The liquid crystal display device according to the present embodiment includes a pair of substrates (not shown) facing each other and a liquid crystal layer (not shown) sandwiched between the pair of substrates.

  Furthermore, as shown in FIG. 1, the liquid crystal display device according to the present embodiment includes a display unit DYP including a plurality of display pixels PX arranged in a matrix, a gate driver GD arranged around the display unit DYP, and , A source driver SD, and a controller CTR that controls the gate driver GD and the source driver SD. Note that the liquid crystal display device according to the present embodiment employs a dot inversion driving method in which the plurality of display pixels PX are driven so as to have different polarities from the adjacent display pixels.

  The display unit DYP includes scanning lines G1 to Gm arranged along a row where a plurality of display pixels PX are arranged, and signal lines S1 to Sn arranged along a column where the plurality of display pixels PX are arranged. Has been placed. In the vicinity of the position where the scanning lines G1 to Gm and the signal lines S1 to Sn intersect, pixel switches (not shown) provided in the respective display pixels PX are arranged.

  The gate electrode of the pixel switch is electrically connected to the corresponding scanning lines G1 to Gm. The source electrode of the pixel switch is electrically connected to the corresponding signal lines S1 to Sn. The drain electrode of the pixel switch is electrically connected to a pixel electrode (not shown) disposed in each display pixel PX.

  The gate driver GD is electrically connected to all the scanning lines G1 to Gm, and sequentially scans the gate lines G1 to Gm under the control of the controller CTR. In the liquid crystal display device according to the present embodiment, the source driver SD includes a first source driver SD1 and a second source driver SD2. The first source driver SD1 and the second source driver SD2 each have three input terminals D0, D1, and D2. Video signals from the controller CTR are input to these input terminals D0, D1, and D2.

  The first source driver SD1 is disposed along one end side E1 of the display unit DYP. The second source driver SD2 is disposed along the end side E2 of the display unit DYP facing the one end side E1 of the display unit DYP.

  As shown in FIGS. 1 and 2, the signal lines S1 to Sn are electrically connected to the first source driver SD1 and the second source driver SD2 alternately every two lines. That is, one end of the signal lines S1, S2, S5, S6... Is electrically connected to the second source driver SD2. One end of each of the signal lines S3, S4, S7, S8, is electrically connected to the first source driver SD1.

  Video signals applied to the signal lines S3, S8, S15,... Are sequentially input to the input terminal D0 of the first source driver SD1. Video signals applied to the signal lines S4, S11, S16,... Are sequentially input to the input terminal D1 of the first source driver SD1. The video signals applied to the signal lines S7, S12,... Are sequentially input to the input terminal D2 of the first source driver SD1.

  Video signals applied to the signal lines S1, S6, S13, S18,... Are sequentially input to the input terminal D2 of the second source driver SD2. The video signals applied to the signal lines S2, S9, S14,... Are sequentially input to the input terminal D1 of the second source driver SD1. Video signals applied to the signal lines S5, S10, S17,... Are sequentially input to the input terminal D0 of the second source driver SD2.

  The gate driver GD, the first source driver SD1, and the second source driver SD2 sequentially write video signals to the display pixels PX under the control of the controller CTR. At this time, the gate driver GD sequentially applies scanning signals to the scanning lines G1 to Gm. The scanning signal applied to the scanning lines G1 to Gm is applied to the gate electrode of the pixel switch, and the source-drain path of the pixel switch becomes conductive.

  The controller CTR includes a timing controller TCTR that outputs a video signal input from the external signal source SS to the first source driver SD and the second source driver SD2. The timing controller TCTR outputs video signals to the input terminals D0, D1, and D2 of the first source driver SD1 and the second source driver SD2 at a predetermined timing.

  As shown in FIG. 1, the timing controller TCTR includes an input signal receiving unit A1 and a data control unit A2. The video signal input from the external signal source SS to the controller CTR is received by the input signal receiving unit A1 of the timing controller TCTR. As shown in FIG. 5, the video signal received by the input signal receiving unit A <b> 1 includes a video signal (R1, R2...) Corresponding to red display and a video signal ( G1, G2,...) Or video signals (B1, B2,...) Corresponding to blue display are arranged in order.

  The video signals received by the input signal receiving unit A1 are arranged in the order shown in FIG. 5 and output to the data control unit A2. That is, the video signals R1, R2, R3... Corresponding to the red display are arranged in the order in which they are input to the same input terminal. Similarly, video signals G1, G2, G3... Corresponding to green display are input to the same input terminal, and video signals B1, B2, B3... Corresponding to blue display are input to the same input terminal. Are arranged.

  The video signals are output from the input signal receiving unit A1 to the data control unit A2 in the state of being arranged as described above. The data control unit A2 rearranges the input video signals as shown in FIGS. That is, the video signal is input to the input terminal D0 of the first source driver SD1 in the order of the video signal B1, the video signal G3, the video signal B5,. The video signal is input to the input terminal D1 of the first source driver SD1 in the order of the video signal R2, the video signal G4, the video signal R6,. The video signal is input to the input terminal D2 of the first source driver SD1 in the order of the video signal R3, the video signal B4, the video signal R7,.

  Similarly, the video signal is input to the input terminal D0 of the second source driver SD2 in the order of the video signal G2, the video signal R4, the video signal G6,. The video signal is input to the input terminal D1 of the second source driver SD2 in the order of the video signal G1, the video signal B3, the video signal G5,. The video signal is input to the input terminal D2 of the second source driver SD2 in the order of the video signal R1, the video signal B2, the video signal R5,.

  The data control unit A2 further transmits a first polarity signal POL1 and a second polarity signal POL2 to the first source driver SD1 and the second source driver SD2. The first source driver SD1 outputs a video signal having a predetermined polarity to the signal line S in accordance with the value of the first polarity signal POL1. The second source driver SD2 outputs a video signal having a predetermined polarity to the signal line S according to the value of the second polarity signal POL2.

  For example, in the case of dot inversion (1H1V) driving, as shown in FIG. 6, a high level (H) signal and a low level (L) signal are alternately generated as the first polarity signal POL1 and the second polarity signal POL2. The data is input to the first source driver SD1 and the second source driver SD2.

  The first source driver SD1 and the second source driver SD2 apply video signals input from the timing controller TCTR to the signal lines S1 to Sn with a predetermined polarity according to the levels of the polarity signals POL1 and POL2.

  In the liquid crystal display device according to the present embodiment, the first source driver SD1 and the second source driver SD2 use the same dot inversion driving driver. The first source driver SD1 and the second source driver SD2 are arranged so that the output terminals face each other across the display unit DYP. Therefore, the terminal corresponding to the terminal to which the signal line S1 of the first source driver SD1 is connected is the terminal to which the signal line Sn of the second source driver SD2 is connected.

  Therefore, when the same polarity signal is input to the first source driver SD1 and the second source driver SD2, the terminal connected to the signal line S1 of the first source driver SD1 and the signal line Sn of the second source driver SD2 are input. Video signals having the same polarity are output from the connected terminals. Therefore, as shown in FIGS. 1 and 2, when the polarity is inverted for each pixel (1H1V inversion), the first source driver SD1 and the second source driver SD2 are different from each other as shown in FIG. Level polarity signals POL1 and POL2 are input.

  For example, when the first polarity signal POL1 is at a high level, the first source driver SD1 outputs an anodic video signal to the signal lines S3, S7, S11... And a negative polarity to the signal lines S4, S8, S12. Video signal is output. Accordingly, as shown in FIG. 2, for example, an anodic video signal B1 is output to the signal line S3, and a negative video signal R2 is output to the signal line S4.

  When the first polarity signal POL1 is at a low level, the first source driver SD1 outputs a negative video signal to the signal lines S3, S7, S11... And a positive video to the signal lines S4, S8, S12. Output a signal. Therefore, for example, the negative video signal B1 is output to the signal line S3, and the positive video signal R2 is output to the signal line S4.

  When the second polarity signal POL2 is at a low level, the second source driver SD2 outputs an anodic video signal to the signal lines S1, S5, S9... And a negative video to the signal lines S2, S6, S10. Output a signal. Therefore, as shown in FIG. 2, for example, an anodic video signal R1 is output to the signal line S1, and a negative video signal G1 is output to the signal line S2.

  When the second polarity signal POL2 is at a high level, the second source driver SD2 outputs a negative video signal to the signal lines S1, S5, S9... And a positive video to the signal lines S2, S6, S10. Output a signal. Therefore, for example, the negative video signal R1 is output to the signal line S1, and the positive video signal G1 is output to the signal line S2.

  Similarly, when the polarity is inverted every two pixels (1H2V inversion), the polarity signals POL1 and POL2 are inverted every two lines as shown in FIG.

  As described above, the data controller of the timing controller TCTR arranges the video signals to be input to the first source driver SD1 and the second source driver SD2 as shown in FIGS. A liquid crystal display device to which dot inversion driving is applied using a driver can be provided.

  That is, according to the liquid crystal display device according to the present embodiment, when source drivers are arranged on the upper and lower sides of the display unit, inversion driving such as dot inversion driving can be realized using commonly used components. A liquid crystal display device can be provided.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. For example, in the liquid crystal display device according to the above embodiment, two signal lines S are alternately connected to the first source driver SD1 and the second source driver SD2 two by two, but the signal line S is not limited to this. It suffices if the even number is alternately connected to the first and second source drivers SD1 and SD2.

  The even number of signal lines S are alternately connected to the first source driver SD1 and the second source driver SD2, and the polarity signals POL1 and POL2 having different levels are input to the signal line S. The video signal of the cathode is applied alternately.

  Therefore, according to the liquid crystal display device according to the present embodiment, the even number of signal lines S are alternately connected to the first source driver SD1 and the second source driver SD2, and a general source driver for dot inversion driving is used. Thus, it is possible to provide a liquid crystal display device that can realize an inversion driving method such as dot inversion driving.

  Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine the component covering different embodiment suitably.

1 is a diagram schematically illustrating an example of a configuration of a liquid crystal display device according to a first embodiment of the present invention. FIG. 3 is a diagram for explaining an example of an output signal of a source driver of the liquid crystal display device shown in FIG. The figure for demonstrating an example of the arrangement | sequence order of the video signal output to the 1st source driver from the data control part of the liquid crystal display device shown in FIG. The figure for demonstrating an example of the arrangement | sequence order of the video signal output to the 2nd source driver from the data control part of the liquid crystal display device shown in FIG. The figure for demonstrating an example of the arrangement | sequence order of the video signal output to the data control part from the input signal receiving part of the liquid crystal display device shown in FIG. FIG. 4 is a diagram for explaining an example of a polarity signal input to the first and second source drivers when performing dot inversion driving (1H1V) in the liquid crystal display device shown in FIG. 1. FIG. 3 is a diagram for explaining an example of a polarity signal input to the first and second source drivers when performing 1H2V inversion driving in the liquid crystal display device shown in FIG. 1.

Explanation of symbols

  PX ... display pixel, DYP ... display unit, GD ... gate driver, SD ... source driver, CTR ... controller, E1 ... one end, E2 ... other end, TCTR ... timing controller, TB1, TB2 ... array means

Claims (4)

A pair of substrates facing each other;
A liquid crystal layer sandwiched between the pair of substrates;
A display unit comprising a plurality of display pixels arranged in a matrix;
A gate driver that selects each row of the plurality of display pixels;
A source driver for supplying a video signal to display pixels selected by the gate driver;
A controller for controlling the gate driver and the source driver,
The source driver includes a first driver arranged along one end side of the display unit, and a second driver arranged along an end side facing the one end side of the display unit,
The controller includes a timing controller that outputs a video signal to the first driver and the second driver;
The said timing controller is a liquid crystal display device provided with the arrangement | sequence means to arrange | position so that the video signal output to the said 1st driver and the said 2nd driver may be applied to the said corresponding display pixel. A signal line disposed along a column in which the plurality of display pixels are arranged;
The liquid crystal display device according to claim 1, wherein the signal lines are alternately connected to the first driver and the second driver every two lines.   The liquid crystal display device according to claim 1, wherein the first driver and the second driver have three input terminals to which video signals are input from the timing controller.   The liquid crystal display device according to claim 1, wherein the arranging unit includes a receiving unit that receives an input signal and a data control unit that rearranges the signals received by the receiving unit.

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