DBS Electrode Height Adjustment for Display Panel Light Leakage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional liquid crystal display panels experience light leakage and color shift when bent, due to the shift in position of the black matrix, and insufficient coverage by the data line black matrix electrode leads to aperture ratio loss and increased crosstalk.
Innovation Solution
A display panel design where the data line black matrix electrode (DBS electrode) is reduced in thickness or height relative to the pixel electrode, with specific embodiments showing the DBS electrode being 0 to 1 micrometer lower, effectively compressing the electric field range and improving light leakage and crosstalk without reducing the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the black matrix is disposed on one side of the color filter substrate to shield light, then light shielding is improved, but bending the panel causes a shift in position of the BM, resulting in light leakage and color shift
Solution Approach 1:
The patent extracts the light shielding function from the traditional black matrix structure and relocates it to the array substrate side through the DBS electrode design. The DBS electrode is disposed on the array substrate to shield light leakage above data lines, separating the shielding function from the color filter substrate and eliminating the position stability issue caused by bending.
Solution Approach 2:
The patent transitions the shielding approach from a 2D planar black matrix on the color filter substrate to a 3D structured DBS electrode on the array substrate. The DBS electrode extends in multiple dimensions with specific thickness variations (0.2-1 micrometer lower than pixel electrode) to create effective shielding zones that adapt to the panel's bending deformation.
2Area of stationary object
If the shielding metal is removed at sub-pixel to increase aperture ratio, then aperture ratio is improved, but the DBS electrode coverage becomes insufficient, causing light leakage
Solution Approach 1:
The patent applies local quality by creating non-uniform thickness in the DBS electrode, making it 0.2-1 micrometer lower than the pixel electrode in specific regions. This localized thickness variation optimizes the electric field distribution to provide sufficient light shielding above data lines while maintaining high aperture ratio in the sub-pixel regions where shielding metal is removed.
Solution Approach 2:
The patent changes the thickness parameter of the DBS electrode relative to the pixel electrode, setting it 0.2-1 micrometer lower. This parameter adjustment creates an optimized electric field range that effectively shields light leakage without requiring full coverage, thereby maintaining high aperture ratio while preventing light leakage.
3Object-affected harmful factors
If the DBS electrode thickness is reduced relative to pixel electrode, then light leakage is reduced, but aperture ratio may be affected
Solution Approach 1:
The patent optimizes the thickness parameter of the DBS electrode, setting it 0.2-1 micrometer lower than the pixel electrode. This precise parameter control creates an electric field range that is sufficient for light shielding above data lines while minimizing the impact on aperture ratio. The reduced thickness of DBS electrode compared to pixel electrode effectively compresses the electric field range to reduce light leakage at viewing angles.
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
Significantly reduces light leakage at viewing angles and improves vertical crosstalk, with maximum light leakage brightness reduced by up to 70% by adjusting the relative heights of the DBS and pixel electrodes.
Implementation Method 1
the formed electric field can maintain the liquid crystal molecules in a state of no deflection, thereby shielding light
Implementation Method 2
A driving voltage is applied to the two substrates to control a rotation direction of the liquid crystal molecules to refract light of the backlight module to generate a picture
Data Source
AI summary
A display panel and a method of manufacturing the same are provided. The display pane includes an array substrate and a color filter substrate disposed opposite to each other, and a liquid crystal layer disposed between the array substrate and the color filter substrate. The array substrate includes a transparent electrode layer. The transparent electrode layer includes a pixel electrode and a data line black matrix less (DBS) electrode spaced with each other, a height of the DBS electrode is 0 to 1 micrometer lower than a height of the pixel electrode.