HVA Liquid Crystal Display Hollow Common Electrode Light Shielding
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Solution Overview
Problem
The removal of the black matrix in liquid crystal display panels leads to border light leakage and color washout issues due to the lack of light shielding, particularly in High Vertical Alignment (HVA) mode, where the alignment shift between substrates causes electric fields to drive liquid crystals, resulting in unwanted light penetration and color mixing.
Innovation Solution
A HVA liquid crystal display panel design featuring a common electrode layer with hollow parts above the gate scan lines and data lines, preventing electric field generation at the borders of sub-pixel areas, thereby replacing the black matrix function and preventing light leakage and color washout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the black matrix is removed to save cost or achieve curve design, then manufacturing cost is reduced and design flexibility is improved, but border light leakage and color washout occur due to lack of light shielding
Solution Approach 1:
The patent extracts the light shielding function from the black matrix by creating hollow parts in the common electrode layer. These hollow parts are positioned above the gate scan lines and data lines to block light in the border regions, eliminating the need for a separate black matrix while preventing border light leakage.
Solution Approach 2:
The common electrode layer is given multiple functions: it serves as both the electrode for voltage application and as a light shielding structure through its hollow parts. This multi-functional design replaces the black matrix's light shielding role while maintaining the electrode's electrical function.
2Ease of manufacture
If the black matrix is removed, then manufacturing cost is reduced, but color washout occurs due to alignment shift between substrates
Solution Approach 1:
The patent removes the black matrix while compensating for alignment shifts by positioning hollow parts in the common electrode layer directly above the gate scan lines and data lines. This ensures that even when substrates are misaligned, the light shielding function remains effective at the border regions, preventing color washout.
Solution Approach 2:
The hollow parts in the common electrode layer act as an intermediary light shielding structure between the pixel electrodes and the liquid crystal layer. This intermediary structure prevents light from leaking into adjacent pixels, maintaining color accuracy even when substrate alignment is not perfect.
3Ease of manufacture
If a continuous plane type common electrode is used, then manufacturing is simple, but electric fields generate at borders driving liquid crystals to twist and cause light leakage
Solution Approach 1:
The patent segments the common electrode layer by creating hollow parts above the gate scan lines and data lines. This segmentation prevents continuous electric field formation at the borders, eliminating the twist effect in liquid crystals and preventing light leakage while maintaining ease of fabrication.
Solution Approach 2:
The patent extracts the problematic electric field generation areas by removing the common electrode material above the gate scan lines and data lines. This extraction prevents the formation of harmful electric fields that would otherwise drive liquid crystal molecules to twist and leak light.
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
The hollow common electrode layer effectively shields light and maintains color accuracy by eliminating electric fields at sub-pixel borders, thus preventing border light leakage and color washout, even when substrate alignment is shifted.
Implementation Method 1
the twist of the liquid crystal molecules in the liquid crystal layer is controlled by the vertical electric field formed by the pixel electrode of the array substrate side and the common electrode of the color filter substrate side
Implementation Method 2
the twist of the liquid crystal molecules in the liquid crystal layer is controlled by the vertical electric field
Data Source
AI summary
The present invention provides a HVA liquid crystal display panel, comprising an upper substrate (1), a lower substrate (2) and a liquid crystal layer (3) located between the upper substrate (1) and the lower substrate (2); the upper substrate (1) comprises a first substrate (11), and a common electrode layer (12) located on the first substrate (11) facing the lower substrate (2); the lower substrate (2) comprises a second substrate (21), a plurality of gate scan lines and a plurality of data lines (22) located on the second substrate (21); the plurality of gate scan lines and the plurality of data lines (22) crisscross to form a plurality of sub pixel areas; the common electrode layer (12) comprises a hollow part (121) correspondingly above the gate scan lines and the data lines (22), to prevent border light leakage and color washout phenomenon of the sub pixel areas for replacing a black matrix to achieve light shielding function.