Display Panel Drive Method Fixing VCOM Voltage Difference
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Solution Overview
Problem
Current liquid crystal display technologies face challenges in achieving a wide viewing angle due to the lack of interlinking between two VCOM voltages, which prevents a fixed voltage difference from being maintained.
Innovation Solution
A method and device for driving a display panel by acquiring a first common voltage, determining a preset threshold, and outputting a second common voltage based on the first common voltage and the preset threshold, allowing for a fixed voltage difference by adjusting only one common voltage, with the other voltage automatically following.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two VCOM voltages are provided by independent power supplies, then voltage control flexibility is improved, but a fixed voltage difference cannot be achieved
Solution Approach 1:
The patent implements a feedback mechanism where the first VCOM voltage is acquired, converted to digital signal, compared with a standard voltage to obtain a difference value, and this difference value is used to adjust the second VCOM voltage through the gamma voltage generation module, ensuring the voltage difference between CF-VCOM and Array-VCOM remains fixed and stable
Solution Approach 2:
The patent introduces a voltage difference detection module and gamma voltage generation module as intermediary components between the two independent power supplies. These intermediaries transmit and process the voltage difference information, enabling coordinated control of the two VCOM voltages to maintain a fixed difference while preserving independent control capability
2Illumination intensity
If sub-pixel voltage is discharged to Array-VCOM, then brightness performance for side viewing angle is improved, but voltage difference between CF-VCOM and Array-VCOM cannot be fixed
Solution Approach 1:
The system continuously monitors the first VCOM voltage (CF-VCOM), converts it to digital form, calculates the difference from a standard voltage, and uses this feedback to dynamically adjust the second VCOM voltage (Array-VCOM) through the gamma voltage generation module, ensuring the voltage difference remains fixed while enabling proper sub-pixel discharge for wide viewing angle and bright performance
Data Source
AI summary
Provided are a drive device and a drive method for a display panel, the drive method comprising: first, acquiring a first common voltage; next, determining a preset threshold according to the first common voltage; and finally, outputting a second common voltage according to the first common voltage and the preset threshold. By means of the present drive method for the display panel, it is only necessary to adjust one common voltage, and another common voltage will automatically follow on the basis of the preset threshold, thus achieving the goal of fixing a voltage difference.