Display Panel Light Absorption Layer for Sensor Accuracy
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Solution Overview
Problem
Current LCD backlight saving technologies face challenges due to the sensitivity-decreasing effects of ultraviolet and infrared light beyond 380 nm to 780 nm on ambient light sensors, which affects detection accuracy and requires additional space and cost for light sensors.
Innovation Solution
A display panel incorporating a light sensor formed in the display substrate and a light absorption layer disposed on the substrate to absorb invisible light, specifically using materials with infrared and ultraviolet light absorbent properties to reduce stray light interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a light sensor is integrated into the panel to sense ambient light, then the space of the device is saved, but the sensitivity of the light sensor is decreased due to interference from ultraviolet and infrared light
Solution Approach 1:
The patent introduces a light absorption layer as an intermediary component between the ambient light and the light sensor. This layer selectively absorbs ultraviolet and infrared light while allowing visible light to pass through to the sensor, thereby mediating the interaction between sunlight and the sensor to improve detection accuracy without sacrificing space savings from integration
Solution Approach 2:
The patent applies local quality by creating a specialized light absorption layer with specific optical properties positioned at the incident light side of the light sensor. This layer has different transmittance characteristics for different wavelength ranges (high transmittance for visible light, low transmittance for UV and IR), providing localized spectral filtering exactly where needed to protect the sensor
2Adaptability or versatility
If additional light sensors are added to sense ambient light intensity, then the brightness control function is achieved, but the device space is occupied and cost increases
Solution Approach 1:
The patent makes the integrated light sensor universal by enabling it to perform both display pixel functions and ambient light sensing functions. The light sensor is incorporated into the display substrate itself, allowing the same component to serve dual purposes: as part of the display structure and as an ambient light sensor for brightness control, thereby achieving multi-functionality without additional space
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 light absorption layer improves the sensitivity of the light sensor by reducing the influence of infrared and ultraviolet light, thereby enhancing the detection accuracy and reducing the need for additional space and components.
Implementation Method 1
a light absorption layer, disposed on the display substrate, located at an incident light side, and overlapped with the light sensor; wherein the light absorption layer is configured to absorb invisible light
Data Source
AI summary
A display panel is disclosed and comprising a display substrate, a light sensor, and a light absorption layer; the light sensor is formed in the display substrate and configured to sense ambient light; the light absorption layer is disposed on the display substrate and overlapped with the light sensor; and the material of the light absorption layer comprises at least one of an infrared light absorbent and an ultraviolet light absorbent.