Display device

A technology for display devices and converters, which is applied to static indicators, image communications, electrical components, etc., can solve the problems of rising manufacturing costs of drive control circuits and rising costs of display devices, and achieve suppression of complexity and cost of manufacturing processes The effect of preventing the rise of the threshold voltage and the fluctuation of the threshold voltage

Inactive Publication Date: 2007-04-11
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when such a circuit is provided, it becomes a special specification different from the conventional drive control circuit, which increases the manufacturing cost of the drive control circuit, thereby bringing about an increase in the cost of the display device.

Method used

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Experimental program
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Embodiment approach 1

[0038] Next, specific embodiments of the present invention will be described. In order to facilitate the understanding of the present invention, first, conventional general-purpose drive control circuits and gate drivers will be described. FIG. 1 is a block diagram showing a configuration example of a conventional display device.

[0039] In the display device of FIG. 1 , pixels PX composed of a-Si TFTs formed on an insulating substrate such as glass are arranged in a matrix. Examples of the pixel PX include a pixel using a liquid crystal element, a pixel using an electroluminescent element such as organic EL (electroluminescence), and the like.

[0040] FIG. 2( a ) is a structural example of a liquid crystal pixel using a-Si TFT. The gate of the active element 121 (a-Si TFT) is connected to the gate line, and the drain of the active element 121 is connected to the data line. In addition, the storage capacitor 122 and the liquid crystal element 123 are connected to the sourc...

Embodiment approach 2

[0126] In Embodiment 2, an example of the circuit configuration of the frequency dividing circuit 20 different from that in FIG. 7 is shown.

[0127] FIG. 12 is a diagram showing a circuit configuration of a frequency dividing circuit 20 a according to the second embodiment.

[0128] The frequency dividing circuit 20a is different from the frequency dividing circuit 20 of FIG. 7 in that a transistor 26 is provided between the input terminal of the start signal STYE and the node N5. That is, the frequency dividing circuit 20a has a latch converter 23a composed of transistors Q10 to Q13, Q26 between the nodes N1 and N5 instead of the latch converter 23 of FIG. 7 .

[0129] FIG. 13 is a timing chart showing the operation of the frequency division circuit 20a, showing transition from a state where the frequency division signal VFR is at H level and the frequency division signal / VFR is at L level to the state where the frequency division signal VFR is at L level and the frequency ...

Embodiment approach 3

[0132] Embodiment 3 also shows an example of the circuit configuration of the frequency dividing circuit 20 different from that in FIG. 7 . FIG. 14 is a diagram showing a circuit configuration of a frequency dividing circuit 20b according to the third embodiment. In the frequency dividing circuit 20b of FIG. 14, a buffer 29 is provided instead of the transistor Q1 of FIG. 7, and a buffer 22a is provided instead of the buffer 22 and the transistor Q9 of FIG. Other configurations are the same as in FIG. 7 .

[0133] The buffer 29 is composed of a buffer circuit composed of transistors Q18a and Q19a, a transistor Q1a connected between the buffer circuit and the input terminal of the start signal STYO, and a transistor Q1b connected between the buffer circuit and the low potential side power supply. . The gate of the transistor Q18a is connected to the gate of the transistor Q18 (node ​​N7), and the gate of the transistor Q19a is connected to the gate of the transistor Q19 (node...

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Abstract

The present invention provided a display device, using the current drive control circuit to prevent the alteration of the a-Si TFTs vale value voltage of the gate driver. A display device includes a gate driver for driving pixels (PX), a drive control circuit for outputting a predetermined control signal to the gate driver, and a frequency division circuit. The pixels, the gate driver, and the frequency division circuit are formed using amorphous silicon thin film transistors (a-Si TFTs) formed on an insulating substrate. The control signal output from the drive control circuit includes a start signal for a start of a frame period of an image signal, and the frequency division circuit generates a frequency division signal whose period corresponds to a frequency which is obtained by dividing a frequency of the start signal.

Description

technical field [0001] The present invention relates to a display device including a gate driver composed of a thin film transistor (TFT). Background technique [0002] A display device such as a liquid crystal display or an organic EL display includes pixels arranged in a matrix on an insulating substrate such as glass, gate lines (scanning lines) provided for each pixel row (pixel line), and sequentially selecting these gate lines. A gate driver that drives pole lines. The gate driver may be composed of a shift register, but, in order to simplify the manufacturing process, the shift register used by the gate driver is preferably composed of only field effect transistors of the same conductivity type. Therefore, various shift registers composed of only N-channel type or P-channel type field effect transistors and display devices equipped with such shift registers have been proposed. [0003] In addition, a display device using an amorphous silicon th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/20G09G3/36G09G3/30H04N1/12
Inventor 飞田洋一
Owner MITSUBISHI ELECTRIC CORP
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