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Electro-optical device, driving circuit, and electronic apparatus

A technology for driving circuits and electro-optical devices, applied in optics, nonlinear optics, instruments, etc., can solve the problems of uncertain common electrode voltage, easy voltage fluctuation, and uneven display.

Inactive Publication Date: 2010-11-17
JAPAN DISPLAY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in this technique, there is a problem that the above-mentioned transistor is turned off during the non-selection period in which no selection voltage is applied to the scanning line, so that the common electrode becomes a voltage indeterminate state (high impedance state) where there is no electrical connection.
Therefore, the common electrode is affected by the voltage change and noise of the data line through the parasitic capacitance, so the voltage tends to fluctuate.
If the voltage of the common electrode fluctuates, its influence appears line by line, so stripe-like display unevenness occurs in the horizontal direction, and the display quality deteriorates significantly.

Method used

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  • Electro-optical device, driving circuit, and electronic apparatus
  • Electro-optical device, driving circuit, and electronic apparatus
  • Electro-optical device, driving circuit, and electronic apparatus

Examples

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no. 2 Embodiment approach

[0166] In the above-mentioned first embodiment, in the full-screen mode, the writing polarity of the pixels is reversed line by line. In the partial mode, since the display lines have the same writing polarity , so it is undeniable that the display quality of the pixels displayed by the pixels of the display row is worse than that of the full-screen mode.

[0167] Then, a second embodiment in which the writing polarities between display rows are inverted for each scanning line will be described in the partial mode.

[0168] Figure 10 It is a block diagram showing the configuration of the electro-optical device according to the second embodiment.

[0169] The composition shown in the figure, with figure 1 The difference is that in the odd-numbered row of the common electrode driving circuit 170 , the source electrode of the TFT 175 is connected to the second feeding line 162 , and the source electrode of the TFT 176 is connected to the first feeding line 161 . In the even-n...

no. 3 Embodiment approach

[0200] Next, a third embodiment of the present invention will be described. Figure 18 It is a block diagram showing the configuration of the electro-optical device according to the third embodiment of the present invention.

[0201] As shown in the figure, the electro-optical device 10 is a peripheral circuit built-in type having a display area 100, and a scanning line driving circuit 140, common electrode driving circuits 170a, 170b, and a data line driving circuit 190 are arranged around the display area 100. panel composition. In addition, the control circuit 20 is connected to the aforementioned panel with built-in peripheral circuits via, for example, an FPC (flexible printed circuit) board.

[0202] The display area 100 is an area where pixels 110 are arranged. In this embodiment, scanning lines 112 from the 1st row to the 320th row are respectively provided so as to extend in the row (X) direction. ) to extend in the direction of 240 columns of data lines 114 . Pixe...

no. 4 Embodiment approach

[0307] In the above-mentioned third embodiment, in the full-screen mode, the writing polarity of the pixels is reversed line by line. In the partial mode, since the display lines have the same writing polarity , so it is undeniable that the display quality of the pixels displayed by the pixels of the display row is worse than that of the full-screen mode.

[0308] Then, a fourth embodiment will be described in which the writing polarities between display lines are inverted for each scanning line even in the partial mode.

[0309] Figure 28 It is a block diagram showing the configuration of the electro-optical device according to the fourth embodiment.

[0310] The composition shown in the figure, with Figure 18The difference is that, in the common electrode driving circuit 170b, the connection terminals of the source electrodes of the TFT 175 are divided into odd-numbered rows and even-numbered rows. In detail, the source electrodes of the TFTs 175 in odd rows are connect...

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Abstract

The invention provides an electro-optical device, a driving circuit and an electronic apparatus. Pixels (110) include liquid crystal capacitors and holding capacitors having one end connected to pixel electrodes and the other end connected to common electrodes corresponding to the first to 320th rows. A common electrode driving circuit (170) includes TFTs for individual rows. In a partial mode, when a period in which a level of a scanning signal is high is long, a control signal Vg-c is brought to a high level during the period so that the TFTs are turned on. Since gate voltages are applied to the TFTs (173, 174), a problem in that the gate voltages are reduced due to voltage leakage and the common electrodes (108) are brought into high-impedance states is avoided. Alternatively, potentials of the common electrodes (108) are fixed to a voltage of a common signal Vc, which is a low-level when positive-polarity writing is specified to all the rows and a high-level when negative-polaritywriting is specified to all the rows.

Description

technical field [0001] The present invention relates to a technique for suppressing display unevenness in electro-optical devices such as liquid crystals. Background technique [0002] Such a technique is known. In an electro-optical device such as a liquid crystal, a pixel capacitor (liquid crystal capacitor) is provided corresponding to the intersection of a scanning line and a data line. , the common electrode is individualized for each scanning line (each row), and when a selection voltage is applied to the scanning line, the common electrode corresponding to the scanning line is connected to the supply line of the voltage corresponding to the writing polarity via a transistor (Refer to Patent Document 1). [0003] Patent Document 1: JP-A-2005-300948 [0004] However, in this technique, there is a problem that the above-mentioned transistor is turned off during the non-selection period when no selection voltage is applied to the scanning line, so that the common electr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/20G09G3/36G02F1/1362
Inventor 山崎克则
Owner JAPAN DISPLAY INC