Light Shielding Layer for Reflective Display Driving Circuit
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Solution Overview
Problem
Conventional reflective display apparatuses suffer from reduced display quality due to electrical leakage in the thin film transistors caused by external light illumination, leading to residual images and decreased contrast and reflectivity.
Innovation Solution
Incorporating a light shielding layer between the display layer and the driving circuit layer, which can be made of a light shielding adhesive or a combination of transparent and light shielding adhesives and films, to prevent external light from reaching the driving circuit layer, thereby preventing electrical leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external light passes through the optical clear adhesive to illuminate the driving circuit layer, then the structure is simple and manufacturing is easy, but electrical leakage occurs in the thin film transistors causing residual images and reduced contrast
Solution Approach 1:
A light shielding layer is introduced as an intermediary component between the optical clear adhesive and the driving circuit layer. This layer blocks external light from reaching the thin film transistors, preventing electrical leakage and improving display quality without fundamentally changing the overall structure
Solution Approach 2:
The light shielding layer can be formed using composite approaches such as adding a light shielding film on top of the optical clear adhesive, or using light shielding adhesive that combines adhesive properties with light-blocking properties. This allows the system to maintain structural integrity while adding light shielding functionality
2Reliability
If a light shielding layer is added to prevent electrical leakage and improve display quality, then display quality improves, but the device structure becomes more complex
Solution Approach 1:
The light shielding layer serves multiple functions: it blocks external light from reaching the driving circuit layer, prevents electrical leakage in thin film transistors, and can also serve as an adhesive layer to bond the display layer to the driving circuit layer. This multi-functionality reduces the need for additional separate components
3Ease of manufacture
If the display layer is adhered to the driving circuit layer by optical clear adhesive, then the manufacturing process is simple, but external light causes electrical leakage and reduces contrast
Solution Approach 1:
The solution applies local quality modification by introducing light shielding properties specifically at the interface between the optical clear adhesive and the driving circuit layer. The light shielding layer is positioned only where light blocking is needed, while the rest of the adhesive system maintains its optical clarity and bonding functionality
Solution Approach 2:
The adhesive system is enhanced by combining optical clear adhesive with light shielding properties, either through a separate light shielding film or through light shielding adhesive material. This composite approach maintains the bonding function while adding light-blocking capability
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 light shielding layer effectively prevents electrical leakage, eliminating residual images and improving contrast and reflectivity, resulting in enhanced display quality.
Implementation Method 1
The light shielding layer has a first adhering surface and a second adhering surface, wherein the first adhering surface is adhered to the display layer and the second adhering surface is adhered to the driving circuit layer
Data Source
AI summary
A reflective display apparatus includes a first substrate, a second substrate, a display layer and a light shielding layer. The first substrate has a driving circuit layer and the second substrate has a transparent electrode layer opposite to the driving circuit layer. The display layer is disposed between the driving circuit layer and the transparent electrode layer. The light shielding layer has a first adhering surface and a second adhering surface, wherein the first adhering surface is adhered to the display layer and the second adhering surface is adhered to the driving circuit layer. The light shielding layer can prevent the driving circuit layer from being illuminated by external light rays, and thus display quality of the reflective display apparatus is improved.