Shielding Layer for Sensing Display Electric Field Interference
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Solution Overview
Problem
The electric field generated by a sensing device substrate in display apparatuses can affect the display quality, particularly causing light leakage in liquid crystal displays due to the interaction with the sensing device substrate.
Innovation Solution
Incorporating a shielding layer between the sensing device substrate and the pixel array substrate, which includes a first substrate, a sensing device, signal lines, and a photo-sensitive layer, to mitigate the impact of the electric field on the display medium, thereby improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a sensing device substrate is mounted in the display apparatus, then the sensing function is improved, but the electric field generated by the sensing device substrate affects the display quality and causes light leakage
Solution Approach 1:
A shielding layer is introduced as an intermediary component between the sensing device substrate and the pixel array substrate. This shielding layer acts as a mediator that blocks the electric field generated by the sensing device from interfering with the liquid crystal display, while allowing the sensing function to continue operating. The shielding layer is formed using the same conductive material as the pixel electrodes, ensuring effective electric field blocking without compromising display quality.
2Length of stationary object
If the sensing device substrate is positioned close to the pixel array substrate, then the overall device thickness is reduced, but the electric field interference with the liquid crystal increases
Solution Approach 1:
The shielding layer serves as a mediator that enables the sensing device substrate to be positioned close to the pixel array substrate without direct electric field interference. By blocking the electric field, the shielding layer allows for reduced device thickness while maintaining display quality, effectively resolving the contradiction between compact design and interference prevention.
3Object-affected harmful factors
If a shielding layer is added to block the electric field, then the display quality is improved, but the device complexity increases
Solution Approach 1:
The shielding layer is designed to serve multiple functions: it blocks electric field interference from the sensing device, maintains display quality, and can be integrated with the existing pixel electrode structure using the same conductive material. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while achieving effective interference blocking.
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 shielding layer effectively reduces the interference of the electric field with the liquid crystal molecules, enhancing the display quality by minimizing light leakage and maintaining the sensitivity of the sensing device.
Implementation Method 1
The sensing device detects the light reflected by the fingerprint of finger, and the topography of the fingerprint has different intensity of reflected light
Implementation Method 2
the liquid crystal in the liquid crystal display apparatus may rotate due to the electric field generated by the sensing device substrate, which causes occurrence of light leakage
Data Source
AI summary
A sensing display apparatus includes a pixel array substrate, a sensing device substrate, and a display medium layer. The sensing device substrate includes a first substrate, a sensing device, first to third signal lines, and a shielding layer. The sensing device includes a first switching element electrically connected with the first and second signal lines, an electrically conductive layer electrically connected with the third signal line, an electrode layer electrically connected with the first switching element and a photo-sensitive layer disposed between the electrically conductive layer and the electrode layer. The shielding layer is disposed between the first to third signal lines and the pixel array substrate. The sensing display apparatus has light transmitting regions and a light shielding region surrounding the light transmitting regions. The sensing device and the first to third signal lines are disposed in the light shielding region.