Display Panel Driving Method for Fixed VCOM Voltage Difference
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Solution Overview
Problem
In liquid crystal display technologies, a fixed voltage difference between the Array-VCOM and CF-VCOM voltages cannot be achieved due to independent power supplies that are not interlinked, limiting the wide viewing angle and brightness performance.
Innovation Solution
A method and device for driving a display panel by acquiring a target voltage, comparing it with a preset voltage, and outputting common voltages based on the comparison result, allowing one voltage module to adjust its output, which automatically adjusts the other module's output, thereby achieving a fixed voltage difference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If two independent power supplies are used for VCOM voltages, then device complexity is reduced and ease of manufacture is improved, but a fixed voltage difference cannot be achieved between Array-VCOM and CF-VCOM
Solution Approach 1:
The patent implements feedback control by having the first voltage module output a comparison result based on the target voltage and first preset voltage, then using this comparison result in the second voltage module to adjust the second common voltage. This feedback mechanism ensures that the voltage difference between Array-VCOM and CF-VCOM remains fixed and controlled, resolving the contradiction between manufacturing simplicity and voltage precision.
Solution Approach 2:
The patent introduces a comparison result as an intermediary signal between the two voltage modules. This intermediary carries the relationship information between target voltage and preset voltage, enabling coordinated control of both VCOM outputs without direct complex interlinking, thus achieving precise voltage difference control while maintaining relative system simplicity.
2Illumination intensity
If sub-pixel voltage is dropped to Array-VCOM voltage, then brightness performance for side viewing angle is improved, but viewing angle performance is limited without fixed voltage difference
Solution Approach 1:
The patent changes the voltage parameter relationship by establishing a fixed voltage difference between Array-VCOM and CF-VCOM through coordinated control. This parameter change enables the liquid crystal to maintain proper voltage differential across different viewing angles, improving both brightness performance and viewing angle adaptability simultaneously.
Data Source
AI summary
Provided are a driving device and driving method for a display panel. The driving method comprises: firstly, acquiring a target voltage of a first voltage module; secondly, comparing the target voltage with a first pre-set voltage so as to obtain a comparison result; then, the first voltage module outputting, based on the comparison result and the first pre-set voltage, a first common voltage, and sending the comparison result to a second voltage module; finally, the second voltage module outputting, according to the comparison result and a second pre-set voltage, a second common voltage.