Voltage Conversion Circuit for Flicker Reduction in VA Display Panels
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Solution Overview
Problem
Vertical alignment (VA) display panels suffer from significant flickers due to asymmetrical pixel voltages, which affect display quality and increase manufacturing costs with existing technologies like 2D1G, where the complexity of drive ICs and increased pin count lead to higher costs.
Innovation Solution
A voltage conversion circuit that divides and reversely converts the data signal voltage of a main pixel region to a sub pixel region, ensuring opposite polarities and a smaller absolute value of pixel voltage, using a voltage-dividing unit and a reverse unit controlled by clock signals to generate an intermediate voltage and adjust the potential difference across a holding capacitor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If 2D1G technology is used to enable eight-domain display and reduce color shift, then color shift is improved, but device complexity and manufacturing cost increase due to doubled data signal lines and complex drive IC structure
Solution Approach 1:
The patent merges the functions of generating opposite polarity voltages into a single drive IC by incorporating a voltage inversion circuit. This allows one drive IC to control both main pixel region and sub pixel region with opposite polarities, eliminating the need for separate drive ICs and reduced data signal lines required by 2D1G technology, thus reducing device complexity and manufacturing cost while maintaining eight-domain display capability
Solution Approach 2:
The patent introduces a voltage inversion circuit as an intermediary component within the drive IC. This circuit receives the data signal voltage and generates its inverse, enabling the drive IC to output both original and inverted voltages to different pixel regions. This intermediary mechanism allows the system to achieve opposite polarity control without requiring additional data signal lines or complex external circuitry
2Ease of manufacture
If opposite polarities are used in main pixel region and sub pixel region to reduce flicker, then display quality is improved, but voltage asymmetry causes periodical brightness change and flicker
Solution Approach 1:
The patent deliberately introduces asymmetry in the voltage inversion process by adding a specific voltage offset to the inverted signal. Instead of simply inverting the voltage symmetrically, the circuit adjusts the inverted voltage to compensate for the inherent asymmetry in liquid crystal response to positive and negative voltages. This asymmetric adjustment ensures that the luminance contributions from main pixel region and sub pixel region are balanced, eliminating flicker while maintaining opposite polarity benefits
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution allows for even brightness distribution of pixels with opposite polarities in a single frame, reducing flickers and improving display quality while reducing manufacturing costs by simplifying the drive IC structure.
Implementation Method 1
a voltage-dividing unit which receives a voltage of a data signal of a main pixel region, and divides the voltage of the data signal of the main pixel region so as to output an intermediate voltage
Implementation Method 2
a reverse unit, which, under control of a first clock signal and a second clock signal, reversely converts the intermediate voltage to a voltage of a data signal of a sub pixel region
Data Source
AI summary
Disclosed is a voltage conversion circuit, display panel, and method for driving the display panel. The voltage conversion circuit comprises: a voltage-dividing unit which receives a voltage of a data signal of a main pixel region, and divides the voltage of the data signal of the main pixel region so as to output an intermediate voltage, and a reverse unit which, under control of a first clock signal and a second clock signal, inversely converts the intermediate voltage to a voltage of the data signal of a sub pixel region, rendering polarity of a pixel voltage of the sub pixel region and polarity of a pixel voltage of the main pixel region opposite to each other.