LCD panel of integration digital to analog converter

A digital-to-analog converter and liquid crystal panel technology, applied in the direction of digital-to-analog converters, instruments, static indicators, etc., can solve problems such as drive node voltage reduction, circuit errors, etc., achieve high resolution, achieve resolution, and solve Effects of the charge-sharing problem

Active Publication Date: 2010-02-03
K TRONICS (SUZHOU) TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In LCD driving circuits, charge sharing is a serious potential problem, resulting in voltage reduction at the driving nodes, and even circuit errors in severe cases

Method used

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  • LCD panel of integration digital to analog converter
  • LCD panel of integration digital to analog converter
  • LCD panel of integration digital to analog converter

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] figure 1 It is a schematic diagram of the structure of a liquid crystal panel with integrated digital-to-analog converter of the present invention. Such as figure 1 As shown, the liquid crystal panel includes several gate lines, data lines, and common voltage lines. Thin film transistors TFTs are formed at the intersections of the gate lines and the data lines, and each TFT has a liquid crystal capacitor C LC And storage capacitor C ST . First grid line G 0 ,..., N / 2th grid line G N / 2 ,..., and Nth grid line G N Connect to the gate of each TFT in each row, connect the source of each TFT to the data line, and the liquid crystal capacitor C LC And storage capacitor C ST One end is connected to the drain of each TFT, and the other end is connected to the common voltage line V COM . A charge / discharge upper voltage line V is provided on the LCD panel HIGH And charge / discharge lower voltage line V LOW , The first switch sw1 and the charge / discharge upper voltage line...

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PUM

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Abstract

The invention relates to a liquid crystal panel which is integrated with an D / A converter, comprising a charging / discharging upper voltage line, a charging / discharging lower voltage line, a grid line,a data line and a common voltage line; a film transistor is formed at the crossing of the grid line and the data line; the data line comprises an upper data line, a fifth switch and a lower data linewhich are connected in series; one end of the first switch is connected with the charging / discharging upper voltage line; one end of the second switch is connected with the charging / discharging lowervoltage line; the other ends of the first switch and the second switch are connected with one end of the third switch; the other end of the third switch is connected with the data line; the inventionintegrates the D / A converter into the liquid crystal panel, needs no output damper, and leads the data line to be charged to an objective voltage value. Compared with the technical proposal of the D / A converter and the output damper of the prior art, the liquid crystal panel effectively solves the charge share problem and can achieve higher resolution.

Description

Technical field [0001] The invention relates to a liquid crystal display, in particular to a liquid crystal panel integrated with a digital-to-analog converter. Background technique [0002] Because the Active Matrix Liquid Crystal Display (AMLCD) has the characteristics of clear pictures and bright colors, it is gradually welcomed by consumers. The Digital to Analogue Converter (DAC) is used in the AMLCD data line driver to perform the digital-to-analog conversion function. The digital gray level data is transmitted to the data line driver, and the data line driver transmits the relevant values ​​to the digital One of the voltage nodes on the analog-to-analog converter, the digital-to-analog converter adjusts the brightness of the liquid crystal display to a level that can match a certain gray level through an output buffer (Output Buffer). [0003] image 3 The circuit diagram of the prior art cyclic digital-to-analog converter and output buffer, Figure 4 for image 3 Timing diag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/133G09G3/36H03M1/66
Inventor 李亨均黄应龙
Owner K TRONICS (SUZHOU) TECH CO LTD
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