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Liquid crystal display drive circuit

A liquid crystal display and driver technology, applied to static indicators, instruments, etc., can solve the problems of high equipment cost and cost increase

Active Publication Date: 2008-11-26
SITRONIX TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the chip area required for high-voltage components is large, so the higher the withstand voltage, the larger the size of the high-voltage components
Moreover, the semiconductor manufacturing process of high-voltage components requires higher equipment costs than general semiconductor manufacturing processes, and the larger the size, the more materials are required, and the cost is relatively higher.

Method used

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  • Liquid crystal display drive circuit
  • Liquid crystal display drive circuit
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Embodiment Construction

[0019] Relevant detailed content and technical description of the present invention, now in conjunction with accompanying drawing, explain as follows:

[0020] Please refer to FIG. 3 , which is a block diagram showing an LCD driver operating according to an embodiment of the present invention according to a five-level driving method. The LCD driver of the present invention includes a driving voltage generating circuit 21 for generating five driving voltages, the five driving voltages include liquid crystal positive voltage +Vlcd, liquid crystal reverse voltage -Vlcd, segment positive voltage +Vseg, common electrode voltage Vcom And segment back voltage -Vseg. The LCD driver of the present invention further includes a segment driver 22 controlled by a driving polarity signal CON, which receives the segment positive voltage Vseg and the segment reverse voltage -Vseg for generating a segment driving signal SEG. A voltage switching control circuit 30 controlled by the driving pol...

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Abstract

The invention is a LCD driver, characterized in using a voltage switching control circuit to receive the liquid crystal positive voltage and staged positive voltage generated by a drive voltage generating circuit, and separately switching liquid crystal positive and negative voltages into an universal driver in the different frame stages by the voltage switching control circuit to make only one of the liquid crystal positive and negative exist at the same time, therefore, in selection of semiconductor manufacturing process, the LCD driver only needs to select the manufacturing process with half of the original withstanding voltage according to the original circuit design and constantly supply the required voltages to the staged driver and universal driver.

Description

technical field [0001] The present invention relates to a liquid crystal display technology, in particular to a circuit that automatically switches the positive and negative voltages (+Vlcd and -Vlcd) of liquid crystals, so that the process selection of the driving voltage circuit can be half of the withstand voltage. Background technique [0002] In a five-level driving method of a super interleaved (Super Twisted Nematic, STN) liquid crystal display (Liquid Crystal Display, LCD) driver, it is necessary to use five driving voltages to drive a liquid crystal display, specifically, four driving voltages are used. voltage and a segmented back voltage. According to the general HiFas (High Frequency Amplitude Selection Method) drive IC specification, the liquid crystal positive voltage +Vlcd is +20V, and the liquid crystal reverse voltage -Vlcd is -20V, so the semiconductor process must choose a high voltage process with a withstand voltage of 40V. [0003] FIG. 1 is a block di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/36G09G3/20G02F1/133
Inventor 林春生廖文裕
Owner SITRONIX TECH CORP