Data Light-Blocking Pattern for LCD Reflected Light Interference
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Solution Overview
Problem
In liquid crystal display (LCD) panels operating in plane to line switching (PLS) mode, the absence of a light-blocking pattern over data lines leads to uneven displays due to interference from reflected light, compromising transmittance and image quality.
Innovation Solution
A display substrate with a data light-blocking pattern, formed using a positive photonasty material and integrated with a dummy pattern, is designed to overlap the data line, reducing defects by blocking reflected light without compromising transmittance. The pattern is formed by back exposure and has a width matching the data line, ensuring effective light blocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light-blocking pattern is omitted over data lines to increase transmittance in PLS mode, then transmittance is improved, but reflected light interference causes uneven display defects
Solution Approach 1:
The patent applies local quality by selectively placing light-blocking patterns only in specific locations where they are most needed. The light-blocking pattern is positioned to overlap with the data line in the region where reflected light causes the most interference, while other areas maintain higher transmittance. This localized approach optimizes the balance between blocking harmful reflected light and maintaining overall display brightness and transmittance.
2Object-affected harmful factors
If a light-blocking pattern is added to block reflected light, then display uniformity is improved, but transmittance decreases
Solution Approach 1:
The light-blocking pattern is strategically positioned to overlap with the data line only in the region where reflected light causes the most interference. This localized placement ensures that light blocking is applied precisely where needed to improve display uniformity, while minimizing the impact on overall transmittance by leaving other areas unaffected.
3Object-affected harmful factors
If the light-blocking pattern width is increased to improve light blocking effectiveness, then reflected light interference is reduced, but the area occupied by the pattern increases
Solution Approach 1:
The light-blocking pattern is designed with a width that is sufficient to block reflected light effectively in the critical region where interference occurs. Rather than making the pattern excessively wide across the entire display area, the design applies partial action by concentrating the light-blocking function only in the specific region overlapping with the data line, thus achieving effective interference reduction with minimal area occupation.
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 solution effectively reduces uneven displays caused by reflected light interference while maintaining transmittance, enhancing image quality and display uniformity.
Implementation Method 1
a data light-blocking pattern directly disposed on the dummy pattern
Data Source
AI summary
A display substrate includes a base substrate with a display area and a light-blocking area around the display area, a switching element disposed on the base substrate that includes a gate electrode electrically connected to a gate line extending in a first direction, a source electrode electrically connected to a data line extending in a second direction crossing the first direction, and a drain electrode spaced apart from the source electrode, a color filter layer disposed on the switching element, a first electrode disposed on the color filter layer, an insulation layer disposed on the first electrode, a second electrode disposed on the insulation layer that includes a slit, a dummy pattern disposed on substantially the same layer as the second electrode that overlaps the data line, and a data light-blocking pattern directly disposed on the dummy pattern that has substantially the same width as the data line.