Trans-reflective LCD Substrate Aperture and Capacitance
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Solution Overview
Problem
In trans-reflective liquid crystal displays, the reflective layer in the pixel region reduces the pixel area and aperture ratio, affecting brightness, and increases capacitance between the pixel electrode and data line, impacting stability and display quality.
Innovation Solution
A trans-reflective liquid crystal display array substrate is designed with a black matrix and a reflective layer on the black matrix, which increases the transmissive area and aperture ratio, and positions the pixel electrode above the protective layer to reduce capacitance and enhance stability and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the reflective layer is disposed in the pixel region with RGB color filters, then the trans-reflective display function is achieved, but the pixel area and aperture ratio are reduced, affecting brightness
Solution Approach 1:
The pixel electrode is divided into two distinct parts: a transmissive sub-pixel electrode and a reflective sub-pixel electrode. This segmentation allows each sub-pixel to be optimized for its specific function (transmission or reflection) without the other compromising the overall pixel area, thereby maintaining high aperture ratio while achieving trans-reflective display capability
Solution Approach 2:
The reflective layer is repositioned from the pixel region to the black matrix region, utilizing the space above the TFT in a different spatial dimension. This dimensional relocation eliminates the conflict between reflective layer placement and pixel aperture maximization
2Adaptability or versatility
If the reflective layer is disposed in the pixel region, then the trans-reflective display function is achieved, but the capacitance between pixel electrode and data line increases, impacting stability and display quality
Solution Approach 1:
By segmenting the pixel electrode into transmissive and reflective sub-pixels and placing the reflective layer on the black matrix, the electrical distance between the pixel electrode and data line is increased. This spatial segmentation reduces parasitic capacitance and improves display stability
Solution Approach 2:
The black matrix serves as an intermediary structure that hosts the reflective layer, effectively isolating it from the pixel electrode's electrical field while maintaining optical functionality. This intermediary placement reduces electrical interference and capacitance effects
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 increases the transmissive area and aperture ratio, improving the brightness and stability of the liquid crystal display panel by diffusely reflecting external light and reducing capacitance between the pixel electrode and data line.
Implementation Method 1
the reflective layer on the black matrix, which enlarge the transmissive area of a pixel unit and increase the aperture ratio of the pixel. Further, since the pixel electrode is provided above the protective layer and the distance between the data line of the TFT and the pixel electrode, the capacitance between the pixel electrode and the data line is reduced, the stability of the trans-reflective liquid crystal display substrate is enhanced, and further the brightness of the liquid crystal is increased
Data Source
AI summary
A trans-reflective liquid crystal display array substrate and a manufacturing method thereof. The trans-reflective liquid crystal display array substrate (1) includes a substrate (11) and a thin film transistor (12) provided thereon. A black matrix (13) is provided on the thin film transistor (12) and a reflective layer (14) is located on the black matrix (14). The brightness of the liquid crystal display panel is increased by enlarging the pixel aperture ratio.