Source follower capable of compensating threshold voltage

A technology of source follower and compensation threshold, which is applied in the direction of instruments, static indicators, nonlinear optics, etc., can solve the problems of easily exceeding the allowable value of gray scale error and the circuit cannot work normally, etc.

Inactive Publication Date: 2004-11-24
TPO DISPLAY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] (1) In the push-pull analog buffer 100, when the input voltage is less than the threshold voltage of the transistor, the circuit will not work normally
[0010] (2) In the push-pull analog buffer 100, when working in high-level analysis, the error value easily exceeds the allowable value of grayscale error

Method used

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  • Source follower capable of compensating threshold voltage
  • Source follower capable of compensating threshold voltage
  • Source follower capable of compensating threshold voltage

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Embodiment Construction

[0064] The present invention makes the capacitive switch before the source follower of the n-type transistor (for example, n-type low-temperature polysilicon thin film transistor) or the source follower of the p-type transistor (for example, p-type low-temperature polysilicon thin film transistor), and utilizes the current source , the threshold voltage of the transistor is fixed, so the source follower of the present invention will not work in the dead zone. Furthermore, the source follower of the present invention is suitable for a display (such as a liquid crystal display).

[0065] Next, a switch circuit including at least one capacitor and several switches will be used to illustrate the source follower of the present invention. First, the source follower of an n-type transistor will be described. Please refer to Figure 2A with Figure 2B , which respectively represent a circuit diagram and a timing diagram of a source follower capable of compensating a threshold voltage...

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Abstract

The source follower capable of compensating the threshold includes current source, switching circuit and thin film transistor. The source follower has the current source to fix the threshold voltage of the thin film transistor, and storing capacitor and compensating capacitor to make the input voltage and the output voltage almost the equal, so that the output voltage error may be kept within the error voltage of grey scale voltage.

Description

technical field [0001] The present invention relates to a source follower, and in particular to a source follower capable of compensating threshold voltage. Background technique [0002] After the liquid crystal material was discovered in Europe, its practicality was researched and developed in the United States. Japan deeply explored its properties and application technologies in various fields, and continued to develop a new generation of liquid crystal flat-panel displays. At present, various liquid crystal technologies have been widely used in displays, especially liquid crystal flat panel displays (LCD), and various manufacturers have expanded from TN-LCD (Twisted Nematic-Liquid Crystal Display, twisted nematic liquid crystal flat panel display) to STN-LCD (Super Twisted Nematic-Liquid Crystal Display, Super Twisted Nematic Liquid Crystal Display), and expanded to amorphous silicon TFT-LCD (ThinFilm Transistor LCD, thin film transistor liquid crystal display), and the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/136G09G3/00G09G3/36
Inventor 李英信石安
Owner TPO DISPLAY
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