Electrophoresis Display Shielding Pattern for Photo Current Reduction
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Solution Overview
Problem
Current electrophoresis displays suffer from poor display quality due to photo currents generated by external light sources, which affect the performance of thin film transistors and the overall display quality.
Innovation Solution
An electrophoresis display panel with a shielding pattern is introduced, where the shielding pattern is strategically placed between the active devices and the dielectric layer or pixel electrodes, comprising reflective pixel electrodes or conductive materials that block, reflect, or absorb light, thereby reducing photo current generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If external light source is used for display, then display function is achieved, but photo current is generated affecting display quality
Solution Approach 1:
A shielding pattern layer is introduced as an intermediary between the external light source and the active devices. This shielding layer selectively blocks light from reaching the active devices while allowing light to pass through to the electrophoresis display medium, thereby preventing photo current generation without compromising display function
Solution Approach 2:
The display structure is segmented into distinct functional layers: a shielding pattern layer with light-blocking regions positioned over active devices, and light-transmitting regions positioned over display areas. This segmentation allows different parts of the structure to perform different optical functions simultaneously
2Object-affected harmful factors
If shielding pattern is added to block light, then photo current is reduced, but device complexity increases
Solution Approach 1:
The shielding pattern layer serves multiple functions simultaneously: it blocks light from active devices to prevent photo current, maintains the display structure integrity, and can be integrated with existing thin film transistor fabrication processes. This multi-functionality reduces the need for additional separate components
Solution Approach 2:
The shielding pattern is merged with the existing thin film transistor array substrate structure. The shielding layer is formed as part of the same fabrication process sequence, combining the shielding function with the display device structure rather than adding a separate independent component
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 implementation of the shielding pattern effectively decreases photo current generation, leading to improved display quality by minimizing the impact of external light on active devices.
Implementation Method 1
the shielding pattern is strategically placed between the active devices and the dielectric layer or pixel electrodes, comprising reflective pixel electrodes or conductive materials that block, reflect, or absorb light, thereby reducing photo current generation
Implementation Method 2
the pixels of the electronic book is composed of electrophoresis mediums with various colors (e.g. red, green, blue, etc.) and white charged particles doped in the electrophoresis mediums. By providing voltages to the pixels, the white charged particles are driven to shift
Data Source
AI summary
An electrophoresis display panel including an active device array substrate and an electrophoresis display film is provided. The active device array substrate includes a plurality of active devices and a shielding pattern. The electrophoresis display film is disposed on the active device array substrate. The electrophoresis display film includes a conductive layer, a dielectric layer and a plurality of electrophoresis display mediums. The dielectric layer is disposed on the conductive layer and has a plurality of micro-cups arranged in area array. The dielectric layer is between the conductive layer and the active device array substrate. Light passing through the dielectric layer is prevented from irradiating onto the active devices by the shielding pattern. In addition, the electrophoresis display mediums are filled within the micro-cups, respectively.