Display Panel Gradual Protruding Electrode Structure
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Solution Overview
Problem
Vertical alignment liquid crystal display panels face issues with low transmittance due to the 0° azimuth angle of liquid crystals in the interval region between the data line black matrix less (DBS) common electrode and the pixel electrode, leading to increased dark textures and reduced light efficiency.
Innovation Solution
The display panel incorporates a gradual changing protruding structure on the sides of the DBS common electrode and pixel electrode near the interval region, forming non-straight structures that encourage liquid crystals to pretilt at a 90° azimuth angle, thereby improving alignment convergence and reducing dark textures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If HVA alignment technology and DBS technology are used, then light shielding performance is improved, but transmittance decreases due to increased dark textures width
Solution Approach 1:
The patent applies different structural characteristics to different regions: the interval region between DBS electrode and pixel electrode is designed with specific geometric features (non-straight side, included angle between 0-15 degrees) to create localized electric field distribution that induces 90° azimuth angle alignment, while other regions maintain conventional alignment. This local differentiation allows the interval region to achieve high transmittance while other regions provide light shielding.
Solution Approach 2:
The patent changes the alignment parameters (azimuth angle) in the interval region from the conventional 0° to 90° by modifying the electrode geometry. This parameter change transforms the optical properties of the interval region from dark (low transmittance) to bright (high transmittance), resolving the contradiction between light shielding and transmittance requirements.
2Device complexity
If DBS electrode is used to replace black matrix, then device complexity is reduced, but manufacturing precision becomes more difficult due to voltage difference control
Solution Approach 1:
The patent connects the DBS electrode and pixel electrode through a conductive layer, creating an equipotential relationship between them. This eliminates the voltage difference that would otherwise exist between these electrodes, simplifying the voltage control requirements and reducing manufacturing complexity while maintaining the ability to achieve the desired 90° azimuth angle alignment through geometric design alone.
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 design enhances transmittance by relieving convergence of liquid crystal alignment dark textures and narrowing the dark textures width of the DBS common electrode, resulting in improved light efficiency.
Implementation Method 1
applies voltage to both sides of the liquid crystal layer during alignment (high voltage waveform signal is applied to a color filter (CF) common electrode, and a pixel electrode is grounded) to cause liquid crystals to produce a predetermined angle deviation
Implementation Method 2
incorporates a polymerizable monomer in a liquid crystal layer, applies voltage to both sides of the liquid crystal layer during alignment (high voltage waveform signal is applied to a color filter (CF) common electrode, and a pixel electrode is grounded) to cause liquid crystals to produce a predetermined angle deviation, and irradiates the liquid crystals with ultraviolet (UV) light to form a fixed pretilt angle
Data Source
AI summary
The present invention provides a display panel, including data line wiring regions and pixel regions which are adjacent with one another. A data line is disposed in the data line wiring regions, a data line black matrix less (DBS) common electrode is located on the data line, a pixel electrode is disposed in the pixel regions on a same layer as the DBS common electrode, and an interval region is defined between the DBS common electrode and the pixel electrode. At least one of a side of the DBS common electrode close to the interval region and a side of the pixel electrode close to the interval region comprise a gradual changing protruding structure toward the interval region.