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Driving method of liquid crystal panel and driving circuit thereof

A technology of liquid crystal panel and driving method, which is applied in the direction of instruments, static indicators, etc., can solve the problem of insufficient uniformity (display effect consistency) effect, etc., to achieve better screen display effect, high flexibility, and uniformity Good results

Active Publication Date: 2013-03-06
CHANGSHA HKC OPTOELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] like Figure 12 As shown, the scanning waveform of the driving voltage has a cut angle, but for different panels, especially some larger panels, the linear change effect is more obvious, and the uniformity (up, down, left, right of the LCD panel) The display effect consistency of the four areas) is still not good enough

Method used

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  • Driving method of liquid crystal panel and driving circuit thereof
  • Driving method of liquid crystal panel and driving circuit thereof
  • Driving method of liquid crystal panel and driving circuit thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] like image 3 and Figure 4 As shown, the discharge resistor 10 in the corner-cutting circuit is a digital resistor 10a with adjustable resistance, and a resistance control module is provided outside the corner-cutting circuit to directly adjust the resistance of the digital resistor to change the discharge resistance (that is, the digital resistor) at The resistance value during the continuous discharge process, the change of the resistance value of the discharge resistance will cause the slope of the cutting angle of the scanning waveform to change. The digital resistor includes a plurality of sub-resistors 11 connected in parallel, each sub-resistor 11 is connected in series with a resistance adjustment switch 31, and the discharge slope control module sends a digital control signal to control the switch 31 of the corresponding sub-resistor 11 in the digital resistor to obtain the required Resistance value, the digital resistor 10 is connected in series with the mai...

Embodiment 2

[0040] like Figure 8 As shown, the difference from the first embodiment is that the corner cutting circuit in this embodiment is provided with two discharge resistors, and the two discharge resistors are respectively provided with a switch 3 and a switch 4 . By controlling the conduction of the switch 3 and the switch 4, the slope of the cutting angle can be changed. The specific control can be expressed as: first turn on switch 3 and switch 4, at this time the slope of the cutting angle of the scanning waveform is the first slope of the cutting angle, then turn off switch 4, at this time only one discharge resistor is discharged, and the slope of the cutting angle of the scanning waveform is is the slope of the second chamfer.

Embodiment 3

[0042] The present invention also provides a uniformity adjustment system for liquid crystal panels, such as Figure 9 Shown is a specific embodiment of the system, the system includes: a corner cutting IC, the corner cutting IC is provided with an adjustable resistor with adjustable resistance; a corner cutting control fixture is used to deliver the corner cutting function to the corner cutting IC Control signal and resistance control signal; panel brightness measuring instrument, used to measure the difference in brightness of the sub-regions of the liquid crystal panel 200, and feed back the information of the difference in brightness of the sub-regions to the corner cutting control fixture; the corner cutting control fixture according to the The brightness difference information of the partitions sends the resistance control signal to the corner cutting IC, and the corner cutting IC charges the driving IC 210 of the liquid crystal panel according to the corner cutting funct...

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Abstract

The invention discloses a driving method of a liquid crystal panel and a driving circuit thereof; the method comprises the following steps that through the control of a corner cutting circuit, a scanning waveform is sent to the liquid crystal panel after having cut corners so as to drive the liquid crystal panel. Each scanning cycle of the scanning waveform comprises at least two cut corners with different slopes. According to the driving method of the liquid crystal panel and the driving circuit thereof, when the liquid crystal panel is driven, at least two cut corners with different slopes appear in each scanning cycle of the scanning waveform of the driving voltage under the control of the corner cutting circuit, so that the flexibility in adjusting the scanning waveform is higher when the levelness of the liquid crystal panel is adjusted, the impact on the RC delay of different positions of the panel due to the resistance and the capacitance of the panel on the cut corners of the scanning waveform with different slopes is the closest, the levelness of the panel is the best, and a better picture display effect is achieved.

Description

technical field [0001] The invention relates to the field of manufacturing liquid crystal display devices, and more specifically, relates to a driving method and a driving circuit of a liquid crystal panel. Background technique [0002] In order to improve the uniformity of the LCD panel, it is necessary to reduce the feedback voltage and the linear variation effect. US Patent US7027024 records that a chamfering circuit is added to the driving system of the LCD, and the driving voltage waveform is adjusted by the chamfering circuit so that the waveform has a certain slope. (The slope here refers to the angle between the voltage waveform and the horizontal line, where 0 degrees and 90 degrees are considered horizontal or vertical, but not considered to have a slope), and then output to the scanning line of the LCD panel Program. Usually, each component of the corner cutting circuit is installed on the control board of the LCD driving system. [0003] like Figure 12 As show...

Claims

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Application Information

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IPC IPC(8): G09G3/36
CPCG09G3/36G09G3/3677G09G3/3696G09G2320/0233G09G2320/0693
Inventor 陈胤宏
Owner CHANGSHA HKC OPTOELECTRONICS CO LTD
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