Reflective Array Substrate Patterning for Wider LCD Viewing Angles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional ink-type electronic paper faces limitations due to high cost and limited color capabilities, while total reflection LCD technology has potential in smart retail and e-books but requires advancements in array substrate design for improved performance.
Innovation Solution
The design of an array substrate with a planarization layer featuring uneven pattern units and a reflective electrode layer, which includes disconnected reflective electrodes connected through via holes, enhancing the substrate's reflective capabilities and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional ink-type electronic paper is used, then cost is reduced, but color capability and display performance are limited
Solution Approach 1:
The array substrate is divided into multiple sub-pixel regions (red, green, blue) with different reflective electrode patterns. Each sub-pixel region contains specific pattern units with bumps that control light reflection independently, enabling color display while maintaining the reflective LCD structure that keeps costs low compared to traditional electronic paper alternatives
Solution Approach 2:
Different pattern units with varying bump configurations are placed in different sub-pixel regions to create different reflective characteristics for each color channel. The reflective electrodes in red, green, and blue sub-pixel regions have distinct patterns that selectively reflect ambient light to produce different colors, enhancing color capability while using the same basic reflective LCD approach
2Use of energy by moving object
If total reflection LCD technology is adopted, then power consumption is reduced and multi-color capability is achieved, but viewing angle uniformity deteriorates
Solution Approach 1:
Pattern units with bumps (curved surfaces) are introduced into the reflective electrodes to scatter reflected light in multiple directions. The bumps create a diffusive reflection effect that widens the viewing angle and improves uniformity across different observation angles, while maintaining the passive reflective LCD structure that ensures low power consumption
Solution Approach 2:
The pattern units feature asymmetric bump configurations with specific heights, distances, and arrangements that are optimized to control light reflection characteristics. This asymmetric design allows precise control over viewing angle properties while maintaining the energy-efficient reflective display mode
3Ease of manufacture
If simple flat reflective electrodes are used, then manufacturing is simplified, but viewing angle and display quality are limited
Solution Approach 1:
Instead of flat reflective electrodes, the invention uses pattern units with bumps that create curved reflective surfaces. These bumps scatter light in multiple directions, significantly improving viewing angle and display quality. The bump patterns can be formed using standard photolithography and etching processes, maintaining manufacturing simplicity while achieving superior optical performance
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 configuration improves the viewing angle and maintains uniformity while reducing costs, addressing the limitations of traditional electronic paper and enhancing the performance of total reflection LCD technology for applications in smart retail and e-books.
Implementation Method 1
the pattern unit includes a plurality of first bumps arranged along a circumferential direction of the pattern unit and an spacing groove surrounding each of the first bumps
Implementation Method 2
a reflective electrode layer formed on the planarization layer, wherein the reflective electrode layer includes a plurality of reflective electrodes that are mutually disconnected
Data Source
AI summary
An array substrate includes: a first substrate (10), including a plurality of sub-pixel regions (101) arranged in an array along a row direction (X) and a column direction (Y); a pixel circuit layer, including a plurality of sub-pixel circuits; and a planarization layer (17), provided with a first via hole (170) located in the sub-pixel regions (101), and includes at least one pattern portion (171), the pattern portion (171) includes a plurality of pattern units (171a) arranged in an array along the row direction (X) and the column direction (Y); where the pattern unit (171a) further includes a second bump (1712) located within a central area surrounded by each of the first bumps (1710), and the spacing groove (1711) on a same side of the first bump (1710) and the second bump (1712) is arranged in a non-straight shape.