Reflective Array Substrate Patterning for Wide-Angle Color Displays
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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 first substrate, pixel circuit layer, planarization layer, and reflective electrode layer, featuring a patterned planarization layer with uneven bumps and spacing grooves, and a reflective electrode layer with disconnected electrodes, optimized for reflective display technology to enhance viewing angle and reduce costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional ink-type electronic paper is used, then cost is reduced and simplicity is maintained, but color capability is limited and technical performance is insufficient
Solution Approach 1:
The array substrate is divided into multiple sub-pixel regions (red, green, blue) with dedicated sub-pixel circuits, allowing color display functionality to be segmented across different regions rather than requiring a completely new complex system
Solution Approach 2:
The reflective electrode layer serves multiple functions: it provides electrical connection through via holes, enables light reflection for display, and its uneven shape matching the pattern unit optimizes optical performance. This multi-functional design reduces the need for separate components
2Illumination intensity
If total reflection LCD technology is adopted, then viewing angle and color characteristics are improved, but manufacturing complexity increases
Solution Approach 1:
The reflective electrode is designed with an uneven shape that matches the pattern unit, creating curved/reflected light paths that improve viewing angle. The symmetry axes and radial arrangement of bumps create omnidirectional light reflection characteristics
Solution Approach 2:
The planarization layer has different local properties: flat regions for electrical connections and uneven patterned regions with bumps and grooves for optical performance. This local differentiation optimizes both electrical and optical functions without increasing overall complexity
3Illumination intensity
If an uneven patterned planarization layer is introduced, then viewing angle and uniformity are improved, but manufacturing precision requirements increase
Solution Approach 1:
The pattern unit introduces controlled asymmetry through uneven bumps and grooves that break the flat surface symmetry. This asymmetric structure creates diffuse reflection patterns that improve viewing angle and reduce directional dependence, though it does increase pattern formation precision requirements
4Reliability
If reflective electrode layer with disconnected electrodes is used, then sub-pixel electrical isolation is achieved, but manufacturing complexity increases
Solution Approach 1:
The reflective electrode layer is segmented into multiple disconnected reflective electrodes, each corresponding to a sub-pixel region. This segmentation provides electrical isolation between sub-pixels while maintaining reflective functionality, with each electrode connected through its own via hole to the sub-pixel circuit
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 improves the viewing angle and maintains uniformity in all directions, while reducing costs and addressing the limitations of traditional electronic paper, making it suitable for reflective display applications such as smart retail and e-books.
Implementation Method 1
a reflective electrode layer formed on the planarization layer, wherein the reflective electrode layer includes a plurality of reflective electrodes that are mutually disconnected... a portion of the reflective electrode corresponding to the pattern unit is in an uneven shape matching the pattern unit
Implementation Method 2
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
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; 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); and a reflective electrode layer, wherein the reflective electrode layer includes a plurality of reflective electrodes (18) that are mutually disconnected, each of the reflective electrodes (18) is located in one of the sub-pixel regions (101) and is electrically connected to the sub-pixel circuit through the first via hole (170).