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Drive circuit for display device

A technology for driving circuits and display devices, applied in circuits, identification devices, electrical components, etc., can solve problems such as TFT wrong operation, and achieve the effect of preventing wrong operation, preventing the complication of the manufacturing process, and reducing the area.

Inactive Publication Date: 2018-01-02
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] If a light-shielding film is provided on the TFT, the channel part of the TFT will be affected by the potential of the light-shielding film, which may cause TFT to malfunction

Method used

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  • Drive circuit for display device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0067] figure 1 It is a schematic block diagram showing the configuration of a liquid crystal display device including the scanning line drive circuit according to the first embodiment of the present invention. figure 1 The illustrated liquid crystal display device 1 includes a liquid crystal panel 2 , a display control circuit 3 , a scanning line driving circuit 4 and a data line driving circuit 5 .

[0068] The liquid crystal panel 2 includes n scanning lines GL1 -GLn, m data lines SL1 -SLm, n storage capacitor lines CS1 -CSn, and (m×n) pixel circuits 6 . The scanning lines GL1 to GLn are arranged in parallel to each other. The data lines SL1 to SLm are arranged in parallel to each other so as to be perpendicular to the scanning lines GL1 to GLn. The scan lines GL1˜GLn intersect with the data lines SL1˜SLm at (m×n) places. (m×n) pixel circuits 6 are arranged near the intersections of the scanning lines GL1 to GLn and the data lines SL1 to SLm. The storage capacitor lines...

no. 2 Embodiment approach

[0105] The scanning line driving circuit according to the second embodiment of the present invention is different from the first embodiment in the method of forming the storage capacitor C2. In this embodiment, the electrode member is formed on the same layer as the channel portion of the transistor to be protected, and is electrically connected to the first conduction electrode of the transistor to be protected. Next, differences between the present embodiment and the first embodiment will be described.

[0106] Figure 9 It is a layout diagram of the transistor Tr4 and its vicinity in the scanning line driving circuit according to the first example of this embodiment. In the first example, in order to form the storage capacitor C2, the electrode member 22 is formed integrally with the semiconductor portion 16 on the semiconductor layer. The semiconductor layer pattern has Figure 10 the shape shown. The expanded portion 20 of the light-shielding film 12 is formed so as t...

no. 3 Embodiment approach

[0111] The scanning line driving circuit according to the third embodiment of the present invention is different from the first and second embodiments in the method of forming the storage capacitor C2. In the present embodiment, the electrode member is electrically connected to one conductive electrode of a transistor other than the transistor to be protected. Next, differences between this embodiment and the first and second embodiments will be described.

[0112] Figure 13 ~ Figure 15 These are layout diagrams of the transistor Tr4 and its vicinity in the scanning line driving circuit according to the first to third examples of this embodiment, respectively. exist Figure 13 ~ Figure 15 Among them, the conduction electrode 31 is the drain or source of other transistors. The blocking potential of the transistor is permanently applied to the conducting electrode 31 . The conduction electrode 31 is electrically connected to a semiconductor portion (not shown) of another tr...

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Abstract

A drive circuit for a display device includes a TFT having a source electrode 15, a drain electrode 14, and a gate electrode 13. An electrically isolated light shielding film 12 is provided, which hasa main part for shielding a channel part of the TFT from light and an extension part 20 integrally formed with the main part. An auxiliary capacitance C2 is formed with the extension part 20 and an electrode member 21 integrally formed with the source electrode 15, arranged so as to appear stacked in a plan view. The electrode member 21 may be replaced by an electrode member formed in the same layer as the channel part and connected to the source electrode 15, an electrode member connected to one conduction electrode in another TFT, or an electrode member integrally formed with the gate electrode 13. Thereby, a drive circuit with a small area, including a light-shielded thin film transistor, is provided at a low cost.

Description

technical field [0001] The invention relates to a driving circuit of a display device, in particular to a driving circuit of a display device with light-shielded thin film transistors. Background technique [0002] An active matrix display device displays an image by selecting two-dimensionally arranged pixel circuits in row units and writing voltages corresponding to image data to the selected pixel circuits. Therefore, in a display device, a scanning line driving circuit for driving scanning lines and a data line driving circuit for driving data lines are provided. In addition, using the manufacturing process for forming thin film transistors (Thin Film Transistor, hereinafter referred to as TFT) in the pixel circuit, the technology of integrating all or part of the driver circuit with the pixel circuit on the display panel (driver monolithic technology) Has been put into practical use. [0003] Unlike in-circuit transistors built into IC chips, light shines on TFTs form...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09F9/00G02F1/133G09F9/30G09G3/20G09G3/36H01L21/336H01L29/786
CPCG09G3/3677G09G3/3648G09G3/3674G09G2300/0876G09G2300/0426G09G2310/0286G11C19/28H01L29/786G09G3/20G09G3/36G02F1/133512G02F1/134336G02F1/1368G09G3/3688G09G2310/08
Inventor 山口尚宏古田成山田淳一山中秀一村上祐一郎佐佐木宁
Owner SHARP KK
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