TFT Substrate Photosensitive Capacitor for Automatic Backlight Control
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Solution Overview
Problem
Conventional LCD devices with light sensors have complex structures and high costs, necessitating a simpler and more cost-effective solution for ambient light detection to adjust backlight brightness.
Innovation Solution
A thin film transistor (TFT) substrate with a photosensitive capacitor integrated into the TFT array substrate, where the capacitor's capacitance varies with ambient light intensity, driving a backlight control circuit to adjust brightness, featuring a simple structure and low manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a conventional light sensor is used to detect ambient light and adjust backlight brightness, then the backlight can be automatically adjusted, but the structure becomes complex and cost increases
Solution Approach 1:
The patent combines the light sensing function with the existing TFT array substrate by integrating a photosensitive capacitor into the pixel circuit. Instead of using a separate light sensor component, the sensing function is merged into the substrate itself, eliminating additional components and simplifying the overall structure while maintaining automatic backlight adjustment capability
Solution Approach 2:
The TFT array substrate is designed to serve multiple functions: it acts as both the display control substrate and the light sensing element. The photosensitive capacitor within the pixel circuit serves dual purposes - maintaining pixel electrical characteristics and detecting ambient light intensity, thereby eliminating the need for dedicated light sensing components
2Extent of automation
If a conventional light sensor is used to detect ambient light and adjust backlight brightness, then the backlight can be automatically adjusted, but manufacturing cost increases
Solution Approach 1:
The light sensing function is merged into the existing TFT manufacturing process. The photosensitive capacitor is formed using the same thin film deposition and patterning techniques already employed for the pixel circuits, allowing both functions to be manufactured simultaneously without requiring separate production lines or additional expensive components
Solution Approach 2:
The TFT array substrate is designed to serve multiple functions: it acts as both the display control substrate and the light sensing element. This multi-functionality eliminates the need for separate light sensor components and their associated manufacturing processes, thereby reducing overall manufacturing cost while maintaining automatic backlight adjustment 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 solution allows for automatic backlight brightness adjustment based on ambient conditions with a low-cost, reliable, and simple photosensitive circuit, enhancing the portability and efficiency of LCD devices.
Implementation Method 1
a photosensitive capacitor 212, a connecting electrode 209, and a plurality of pixel electrodes 260 corresponding to the plurality of TFTs 211 on one side of the transparent substrate 210
Data Source
AI summary
A thin film transistor (TFT) substrate includes a transparent substrate, a plurality of TFTs and a photosensitive capacitor formed on the transparent substrate. A capacitance of the photosensitive capacitor is variable on the condition of environment brightness. A method for manufacturing the TFT substrate and an LCD using the TFT substrate are also provided.