Liquid Crystal Display Panel Optical Sensor Light Shielding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional display panels with integrated optical sensors using hydrogenated amorphous silicon semiconductor layers are susceptible to ambient light interference, leading to leakage currents that affect sensor performance.
Innovation Solution
Incorporating a color filter layer with a light shielding portion between color resist blocks, where the light shielding portion is formed by stacked color resist layers of different colors, which filters and absorbs ambient light, reducing its impact on the semiconductor layer and enhancing signal-noise ratio without additional materials or processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If hydrogenated amorphous silicon is used as the semiconductor material in the optical sensor, then the sensor can be integrated into the display panel, but ambient light causes leakage current in the rear channels of the semiconductor layer
Solution Approach 1:
A light shielding portion is introduced as an intermediary element between the ambient light and the semiconductor layer. This light shielding portion includes a first light shielding layer and a second light shielding layer stacked on each other, positioned in the color filter layer to block ambient light from reaching the rear channels of the semiconductor layer, thereby preventing leakage current while maintaining sensor integration
2Reliability
If a light shielding structure is added to block ambient light from the semiconductor layer, then leakage current is reduced, but the device structure becomes more complex
Solution Approach 1:
The light shielding portion is merged with the existing color filter layer structure. The first and second light shielding layers are integrated into the color filter layer formation process, combining the light shielding function with the color filtering function, thereby reducing overall structural complexity while maintaining effective ambient light blocking
Solution Approach 2:
The color filter layer is given multiple functions: it performs color filtering for display purposes and simultaneously houses the light shielding portion that blocks ambient light from the semiconductor layer. This multi-functionality reduces the need for separate light shielding structures, simplifying the overall device complexity
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
Effectively reduces ambient light interference, preventing leakage currents and improving sensor performance while allowing for light control using a projection light beam, all while lowering production costs.
Implementation Method 1
the light shielding portion has at least two stacked color resist layer of different colors, which is able to effectively lower light intensity of irradiation of the ambient light on the first semiconductor
Data Source
AI summary
The present invention discloses a liquid crystal display panel and a liquid crystal display device. The liquid crystal display panel comprises a first substrate and a second substrate. A first underlay substrate of the first substrate is disposed with an optical sensor. Sensing transistors of the optical sensor includes a first semiconductor. A color filter layer is disposed between the first semiconductor and the first underlay substrate. The color filter layer includes color resist blocks and a light shielding portion. an orthographic projection of the light shielding portion on the first underlay substrate covers an orthographic projection of the first semiconductor on the first underlay substrate.