Third Electrodes for Display Panel Color Cast Reduction
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Solution Overview
Problem
In TFT-LCD display panels, the decreasing spacing between pixel electrodes leads to a color cast phenomenon due to deflection of liquid crystal molecules under black matrices, resulting in unsatisfactory display effects, and increasing spacing to mitigate this weakens the electric field and lowers brightness.
Innovation Solution
Incorporating third electrodes on the array substrate, at the same potential as the first electrode, in boundary areas between adjacent pixel units opposite to black matrices, to form an electric field that isolates adjacent pixel electrodes and deflects liquid crystal molecules less under black matrices, thereby alleviating color cast and improving transmittance and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the spacing between adjacent pixel electrodes is increased to reduce liquid crystal molecule deflection under black matrices, then the color cast phenomenon is alleviated, but the transmittance and brightness at the edges of black matrices are reduced
Solution Approach 1:
The invention introduces third electrodes as intermediate elements between the first and second electrodes, segmenting the electric field formation process. These third electrodes are arranged in boundary areas between adjacent pixel units and at different positions, creating multiple localized electric field regions that independently control liquid crystal molecules under different black matrix areas, thereby resolving the contradiction between reducing color cast and maintaining brightness
Solution Approach 2:
The third electrodes are selectively positioned in boundary areas between adjacent pixel units rather than uniformly across the entire display panel. This local placement creates enhanced electric field control specifically where needed at the edges of black matrices, allowing different regions of the display to have optimized electric field characteristics for their specific functional requirements
2Stability of the object's composition
If the spacing between adjacent pixel electrodes is increased to isolate electric fields, then liquid crystal molecule deflection is reduced, but the display uniformity is compromised
Solution Approach 1:
The third electrodes are arranged at different positions and layers from the first and second electrodes, utilizing the vertical dimension and lateral positioning to create a three-dimensional electric field control structure. This multi-dimensional arrangement allows independent control of electric field strength and distribution in different spatial regions, enabling stable liquid crystal orientation without compromising display uniformity
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 effectively reduces color cast on the display device when viewed askance without lowering brightness, enhancing the overall display effect by maintaining brightness while improving transmittance at the edges of black matrices.
Implementation Method 1
the electric field can be formed between the third electrodes and adjacent second electrodes to thereby isolate the adjacent second electrodes of the adjacent two pixel units from each other
Implementation Method 2
liquid crystal molecules below the black matrixes of the color filter substrate can be reflected less significantly to thereby alleviate a color cast phenomenon
Data Source
AI summary
A display panel having a plurality of pixel units arranged in an array includes an array substrate and a color filter substrate which are arranged opposite to each other. The array substrate includes a first electrode, and multiple second electrodes arranged corresponding to the respective pixel units, the first electrode and second electrodes are insulated from each other by an insulation layer; and the color filter substrate includes multiple black matrixes and multiple color resists arranged corresponding to the respective pixel units. The array substrate further includes multiple third electrodes arranged in boundary areas between two adjacent pixel units and opposite to the black matrixes. The third electrodes and the first electrode are disposed in different layers and have a same potential.