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Data driver

A data-driven, digital voltage technology, applied in the direction of digital-to-analog converters, instruments, static indicators, etc., can solve problems such as distortion, analog current signal error, and narrow analog current signal range

Inactive Publication Date: 2007-05-23
TPO DISPLAY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the mirror current I p1 , I p2 , I p3 etc. and the shape ratio of MP2, MP3, MP4, etc., threshold voltage (V th ) and mobility (mobility), if the shape ratio, critical voltage and mobility of MP2, MP3, MP4, etc. produce certain errors from the theoretical values ​​during manufacture, it will cause mirror current I p1 , I p2 , I p3 The value of etc. is different from the theoretical value. Although the error value is not too large, the acceptable analog current signal range of each pixel in AMOLED is very narrow.
Therefore, even if the mirror current I p1 , I p2 , I p3 The error value of etc. is very small, and it may also cause an error in the generated analog current signal, and this error is enough to make the actual value and the theoretical value fall in different gray areas, which will cause a certain pixel to produce different brightness and cause distortion.

Method used

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Embodiment Construction

[0032] As shown in FIG. 3 , the data driving device 2 disclosed in the present invention includes a first shift register 201 , a data register 203 , a voltage latch 205 , a second shift register 207 and N converters 209 . Wherein, the first shift register 201 receives a data shift signal 202 and outputs an N-bit first control signal 204 . The first control signal 204 is input to the data register 203 for sequentially enabling the units in the data register 203 to respectively store N M-bit digital voltage signals 206 . The digital voltage signal 206 needs to be converted into an analog current signal 218 and transmitted to each pixel through a data line to make it emit light. After receiving and storing all the digital voltage signals 206 , the data register 203 transmits these signals to the voltage latch 205 together. After the voltage latch 205 finishes receiving the digital voltage signals 208 , at a specific time, the switching signal 210 will enable the voltage latch 20...

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Abstract

A data driving device used for an active organic LED diplay comprises a plurality of converters for converting a digital voltage signal into an analog current signal to drive the pixels on panel to emit light. The converter comprises a plurality of current mirror devices to control producing mirror-image current, and the error of shape ratio of transistors resulting from manufacturing will not result in the distortion of the mirror-image current.

Description

technical field [0001] The present invention is a data driver for an active OLED display, which is used to convert a digital voltage signal into an analog current signal to drive each pixel in the display to emit light. technical background [0002] Currently, an active organic light emitting diode display (AMOLED) can use an analog current value to drive each pixel in the display to emit light. However, the control signal used to control the light emission of each pixel is a digital voltage value. Therefore, AMOLED needs a data driver, or source driver, to convert its digital voltage signal into an analog current. Signal. [0003] FIG. 1 is a known data drive device 1 . As shown in the figure, the device 1 includes a first shift register (shift register) 101, a data register (data register) 103, a voltage latch (voltage latch) 105, a converter (converter) 107, a A current latch 109 , a current source 111 and a second shift register 113 . The converter 107 receives the d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/32H03M1/66G09G3/3283
Inventor 薛玮杰
Owner TPO DISPLAY