Display Device Light Sensor Transmittance via Segmented Protective Layer
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Solution Overview
Problem
The illumination sensor in portable display devices has low transmittance due to its location at the back surface of the display panel, which reduces its light sensing ability.
Innovation Solution
A display device design that includes a base substrate with a protective layer having an opening for the light sensor, a cover panel with a corresponding opening, and a condensing or reflecting member to enhance light transmittance and focusing, allowing improved light sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the illumination sensor is located at the back surface of the display panel, then the device structure is simplified and manufacturing is easier, but the light transmittance becomes very low
Solution Approach 1:
The protective layer is segmented by forming a light sensor opening that separates the light transmission path from the surrounding protective structure, allowing light to reach the sensor while maintaining overall protective coverage
Solution Approach 2:
A light guide member is introduced as an intermediary component between the external light environment and the illumination sensor, effectively guiding and directing light to the sensor location while maintaining the back-surface mounting advantage
2Ease of manufacture
If the illumination sensor is located at the back surface of the display panel, then the manufacturing process is simpler, but the light sensing ability is reduced
Solution Approach 1:
The light guide member acts as a mediator that bridges the gap between the external light environment and the back-surface mounted sensor, directing light effectively to improve sensing capability while allowing the sensor to remain at the back surface for easy manufacturing
Solution Approach 2:
The optical parameters are changed by introducing a light guide member with specific refractive properties and by creating optimized opening dimensions, transforming the light path characteristics to enhance sensor detection 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 design improves light transmittance through the display panel, enhancing the light sensing ability of the illumination sensor and enabling efficient automatic brightness adjustment based on environmental illumination.
Implementation Method 1
a condensing member that condenses light toward the light sensor
Implementation Method 2
a reflecting member at a side surface of at least one of the first opening in the protective layer and the second opening in the cover panel
Data Source
AI summary
A display device includes: a base substrate having a first surface and a second surface opposite the first surface, the base substrate including a plurality of pixels on the first surface of the base substrate; a protective layer on the second surface of the base substrate, the protective layer having a first opening; a light sensor corresponding to the first opening; and a circuit board on the protective layer. The light sensor is mounted on the circuit board.