Photosensitive TFT Integration for Ambient Light Detection
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Solution Overview
Problem
Conventional display panels require separate photosensitive sensors for ambient light detection, which increase costs and occupy space, and the placement of these sensors can be obstructed by users, affecting accuracy.
Innovation Solution
Integration of a photosensitive thin film transistor structure on the display panel, comprising a reference thin film transistor unit and a photosensitive thin film transistor unit, with a light shielding layer to prevent ambient light interference, allowing for accurate ambient light detection without additional sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate photosensitive sensors are used for ambient light detection, then detection function is achieved, but cost and device area increase
Solution Approach 1:
The patent merges the ambient light detection function with the display panel by integrating photosensitive thin film transistor structures directly into the panel's peripheral area. This eliminates the need for separate photosensitive sensors, reducing both device complexity and cost while maintaining detection accuracy through the specialized transistor design with light shielding layers and controlled light exposure paths.
2Measurement precision
If separate photosensitive sensors are used for ambient light detection, then detection function is achieved, but occupied space increases
Solution Approach 1:
The detection function is merged into the display panel's existing structure, utilizing the peripheral area where thin film transistors are already located. This integration approach eliminates the need for additional sensor modules and reduces the overall occupied space while maintaining detection accuracy through the specialized transistor design.
Solution Approach 2:
The display panel structure is designed to serve multiple functions: it provides display functionality while simultaneously integrating ambient light detection capabilities through the photosensitive thin film transistor structures in the peripheral area. This multi-functionality eliminates the need for separate dedicated sensor components, thereby saving space.
3Measurement precision
If photosensitive sensor is placed above screen, then ambient light can be detected, but detection accuracy is affected by user obstruction
Solution Approach 1:
The patent moves the photosensitive detection function from the vertical dimension (above the screen) to the lateral dimension (peripheral area of the display panel). This dimensional change allows the sensor to detect ambient light from the side, eliminating the problem of user obstruction that occurs when sensors are positioned above the screen, thereby improving detection reliability.
4Object-affected harmful factors
If light shielding layer completely covers photosensitive transistor, then interference is blocked, but light detection is prevented
Solution Approach 1:
The light shielding layer is designed with local quality variations: it completely covers the reference thin film transistors to block light interference, while only partially covering the photosensitive thin film transistors to allow controlled light exposure. This selective shielding approach ensures that reference transistors are protected from light interference while photosensitive transistors can still detect ambient light accurately, resolving the contradiction between interference blocking and light detection.
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
This solution reduces costs and space by integrating ambient light detection into the display panel, ensuring accurate light measurement without user obstruction and improving product competitiveness.
Implementation Method 1
a light shielding layer is arranged on a side of the photosensitive thin film transistor structure close to a display side of the display panel, wherein an orthographic projection of the reference thin film transistor on the base substrate is located within an orthographic projection of the light shielding layer on the base substrate
Implementation Method 2
at least part of an orthographic projection of a channel region of the photosensitive thin film transistor on the base substrate does not overlap the orthographic projection of the light shielding layer on the base substrate
Data Source
AI summary
A peripheral area of the display panel is provided with a photosensitive TFT structure, the photosensitive TFT structure includes a reference TFT unit and a photosensitive TFT unit, first electrodes of a reference TFT included in the reference TFT unit and a photosensitive TFT included in the photosensitive TFT unit are connected to a signal input terminal of the photosensitive TFT structure; a second electrode of the reference TFT is connected to a second signal line of the photosensitive TFT structure; a second electrode of the photosensitive TFT is connected to a third signal line of the photosensitive TFT structure; a gate electrode of the reference TFT is connected to a first control terminal of the photosensitive TFT structure, and a gate electrode of the photosensitive TFT is connected to a second control terminal of the photosensitive TFT structure.