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Displaying apparatus using data line driving circuit and data line driving method

A driving circuit and driving method technology, applied in static indicators, instruments, etc., can solve the problems of insufficient writing current, reducing contrast, increasing electric power consumption, etc., and achieve the effect of improving display unevenness and reducing chip area.

Inactive Publication Date: 2007-11-21
RENESAS ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, since the wiring length of the display signal line becomes long, the parasitic capacitance increases, which increases the electric power consumption
Also, in the data lines far from the buffer, the waveform becomes dull, which leads to insufficient write current and lowers the contrast

Method used

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  • Displaying apparatus using data line driving circuit and data line driving method
  • Displaying apparatus using data line driving circuit and data line driving method
  • Displaying apparatus using data line driving circuit and data line driving method

Examples

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Effect test

no. 1 example

[0044] Next, a display device having a data line driving circuit according to a first embodiment of the present invention will be described with reference to FIGS. 3 to 7 . The display device 100 according to the first embodiment includes a data line driving circuit 10A as the data line driving circuit 10 shown in FIG. 3 .

[0045] FIG. 4 is a circuit diagram showing the configuration of a data line driving circuit 10A according to the first embodiment. The configuration of the data line driving circuit 10A according to the first embodiment will be described in detail with reference to FIG. 4 . The data line drive circuit 10A is a circuit that sends display signals to the pixels 7 through a plurality of data lines 5 and 6, and it includes at least: data latches 21 (21-1 to 21-4), multiplexers 22 (22 -1 to 22-4), D / A converter (DAC: digital-to-analog converter) 23 (23-1 to 23-4), buffer 24 (24-1 to 24-4), gray scale voltage generation Circuit 30 and time division switch group...

no. 2 example

[0071] Next, a display device having a data line driving circuit 10 according to a second embodiment of the present invention will be described with reference to FIGS. 3 and 8 to 11 . A display device 100 according to the second embodiment includes the same data line drive circuit 10B as the data line drive circuit 10 shown in FIG. 3 for dot back-driving on pixels 7 . Dot reverse driving is a driving method in which the polarities adjacent to the pixel 7 are different in the up, down, left, and right directions. In dot back driving, the voltage of the common electrode is usually fixed. Then, the data line driving circuit 10B inverts the polarity. In this embodiment, as an example, a case where the number of data lines in one group is three is described. Here, the number of data lines in a group is an odd number. Therefore, the number of data lines driven by one buffer 24 is 5 or 4. It should be noted that the number of data lines and the number of data lines driven by one ...

no. 3 example

[0104] Next, a data line driving circuit 10 according to a third embodiment of the present invention will be described with reference to FIGS. 3 and 12 , FIGS. 13A to 13G and FIG. 14 . A display device 100 according to the third embodiment includes a data line driving circuit 10C for performing dot reverse driving on pixels 7 , which is the same as data line driving circuit 10 shown in FIG. 3 . Dot reverse driving is a driving method in which the polarities of pixels 7 adjacent to each other in the up, down, left, and right directions are different. In dot back driving, the voltage of the common electrode is usually fixed. Then, the data line driving circuit 10C inverts the polarity. In this embodiment, as an example, a case where the number of data lines in one group is six is ​​described.

[0105] FIG. 12 is a circuit diagram showing the configuration of a data line driving circuit 10C according to the third embodiment. Next, the configuration of a data line driving circu...

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Abstract

A data line driving circuit includes a first buffer circuit configureured to drive a data line, and a second buffer circuit configureured to drive a data line. N first data lines (n is a natural number larger than 1), and m second data lines (m is a natural number larger than 1) are alternately arranged in units of data lines as a group. The data line driving circuit further includes a first switch circuit configureured to select one of the n first data lines in a first ON period and to connect the selected first data line with the first buffer circuit, and a second switch circuit configureured to select one of the m second data lines adjacent to the selected first data line in a second ON period and to connect the selected second data line with the second buffer circuit.

Description

technical field [0001] The present invention relates to a display device, and more particularly, the present invention relates to a display device with a data line driving circuit and a data line driving method. Background technique [0002] Time-division driving is one of various techniques widely used in display devices, and in time-division driving, a plurality of data lines are sequentially selected, and thus display signals are written into pixels. The advantage of time-division driving is that the number of buffers provided in the driver IC can be reduced. A display device employing time-division driving can drive pixels by using the buffers whose number is smaller than the number of data lines on the display panel. This can effectively reduce the electric power consumption and chip area of ​​the driver IC. [0003] In many cases, active matrix type display devices employ TFTs (Thin Film Transistors) as time division switching elements on a display panel substrate. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36G09G3/20G02F1/133
CPCG09G3/3688G09G3/2003G09G3/2011G09G3/3614G09G3/3696G09G2310/0218G09G2310/027G09G2310/0297G09G2310/065G09G2320/0209G09G2330/028
Inventor 桥本义春周隆之
Owner RENESAS ELECTRONICS CORP
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