Video Processing Circuit Reduces Reverse Tilt Domains in LCD Panels
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Solution Overview
Problem
Liquid crystal panels face defects due to reverse tilt domains caused by lateral-direction electric fields, which existing technologies struggle to address without reducing aperture ratio or limiting image brightness.
Innovation Solution
A video processing circuit that adjusts the applied voltage to liquid crystal pixels based on video signals, ensuring initial inclination angles are maintained, thereby reducing reverse tilt domains without altering the panel structure, allowing for use with existing panels and preventing brightness limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If video signals with output signal values larger than or equal to a preset output signal value are clipped to reduce reverse tilt domains, then reverse tilt domains are reduced, but the brightness of displaying images is limited to the preset output signal value
Solution Approach 1:
The patent changes the voltage level parameter of the applied voltage to a level that is higher than or equal to a threshold voltage level. This parameter change allows the liquid crystal molecules to be provided with initial inclination angles that prevent reverse tilt domain formation, while still permitting video signals with output signal values larger than the preset threshold to be displayed without clipping, thereby maintaining image brightness.
2Reliability
If the structure of liquid crystal panels is improved by determining the shape of light shielding layer to reduce reverse tilt domains, then reverse tilt domains are reduced, but the aperture ratio is decreased
Solution Approach 1:
The patent replaces the mechanical/structural approach (modifying light shielding layer shape in the liquid crystal panel structure) with an electrical control approach (adjusting the voltage level of applied voltage). By controlling the voltage level to be higher than or equal to the threshold voltage level, the patent achieves reverse tilt domain reduction without any structural modifications to the liquid crystal panel, thereby preserving the aperture ratio.
3Reliability
If the structure of liquid crystal panels is improved to reduce reverse tilt domains, then reverse tilt domains are reduced, but existing liquid crystal panels cannot be applied without structural improvement
Solution Approach 1:
The patent replaces structural modifications with electrical control by adjusting the voltage level parameter. This approach requires no physical changes to the liquid crystal panel structure, making it universally applicable to both existing and new liquid crystal panels. The method simply requires controlling the applied voltage to levels higher than or equal to the threshold voltage level, which can be implemented through software or control circuitry without hardware modifications.
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
Effectively reduces reverse tilt domains without affecting aperture ratio or image brightness, enabling the use of existing liquid crystal panels and improving display quality.
Implementation Method 1
When a voltage of a level in accordance with a gray scale is applied and maintained between each of the pixel electrodes and the common electrode, alignment conditions of the liquid crystals interposed therebetween are determined for each pixel
Implementation Method 2
alignment conditions of the liquid crystals interposed therebetween are determined for each pixel corresponding to the pixel electrode, and thereby, a transmittance ratio or a reflection ratio of each pixel is controlled
Data Source
AI summary
A video processing circuit for specifying an applied voltage that is applied to a liquid crystal included in each pixel on the basis of a video signal, the video processing circuit includes a correction unit configured to, if the applied voltage specified by the video signal is a voltage of a level lower than a voltage level that is sufficient to an extent that can provide liquid crystal molecules with initial inclination angles, perform correction so that the applied voltage has a voltage level that is sufficient to an extent that can provide the liquid crystal molecules with initial inclination angles.