Integrated Light Detection Circuit Reduces Bezel Width
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Solution Overview
Problem
Traditional in-vehicle display devices cannot adjust brightness according to ambient light, leading to energy wastage and limitations in display effectiveness, especially in multi-screen configurations where the placement of photosensitive devices increases complexity and bezel width, and splicing gaps between adjacent panels are wide.
Innovation Solution
A display substrate with integrated light detection and switch circuits, including photosensitive thin film transistors, resistors, and capacitors, that detects ambient light and adjusts the display brightness, allowing for a narrow-bezel design and reduced splicing gaps between adjacent panels by integrating light detection circuits directly on the substrate during manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If photosensitive devices are placed in multi-screen configurations, then brightness detection capability is improved, but bezel width and device complexity increase
Solution Approach 1:
The patent merges the light detection function with the display substrate by integrating photosensitive thin film transistors directly into the non-display area of the substrate. This integration eliminates the need for separate photosensitive devices in the bezel, thereby maintaining brightness detection capability while reducing bezel width and device complexity.
Solution Approach 2:
The patent transitions the light detection function from a separate spatial component (photosensitive device in bezel) to an integrated circuit component on the substrate plane. By embedding the photosensitive thin film transistors in the non-display area, the solution utilizes the substrate's existing structure to achieve detection without increasing external dimensions.
2Measurement precision
If traditional separate photosensitive devices are used, then brightness detection is achieved, but manufacturing complexity and assembly steps increase
Solution Approach 1:
The patent combines the light detection circuit with the display substrate into a single integrated structure. The photosensitive thin film transistors are fabricated using the same manufacturing processes as the display pixels, eliminating separate assembly steps and reducing manufacturing complexity while maintaining detection functionality.
Solution Approach 2:
The display substrate is designed to serve multiple functions: displaying images and detecting ambient light. By integrating the photosensitive thin film transistors into the substrate's non-display area, the same manufacturing infrastructure produces both display and sensing functions, simplifying the overall manufacturing process.
3Length of moving object
If light detection circuit is integrated on substrate, then bezel width is reduced, but circuit layout complexity increases
Solution Approach 1:
The patent applies local quality by confining the photosensitive thin film transistors to the non-display area of the substrate, which has different functional requirements than the display area. This spatial separation allows optimized circuit layout in the non-display region without interfering with pixel arrangements in the display area, thus reducing bezel width while managing layout complexity.
Solution Approach 2:
The substrate is segmented into display area and non-display area, with the light detection circuit placed in the non-display region. This segmentation allows independent optimization of each area: the display area maintains standard pixel layouts while the non-display area accommodates the detection circuit, reducing overall bezel width without excessive layout 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
The solution enables adaptive brightness adjustment, improving display effectiveness and user experience while reducing bezel width and splicing gaps, thus enhancing energy efficiency and display quality in in-vehicle multi-screen setups.
Implementation Method 1
a light detection circuit is provided in a non-display area of the substrate; the light detection circuit includes a photodiode, a switch thin film transistor, a second resistor and a third resistor
Implementation Method 2
each of the light detection sub-circuits includes: a photosensitive thin film transistor, a first resistor, a light emitting diode and a storage capacitor
Data Source
AI summary
The present disclosure provides a display substrate and a display device, belonging to the field of display technology, which can solve the problem that a splicing gap between existing adjacent display substrates of a spliced screen is relatively wide, and a narrow-bezel display cannot be realized. The display substrate of the present disclosure has a display area and a non-display area surrounding the display area; the display substrate includes a base and a plurality of pixel units located on the base and arranged in the display area; each of the pixel units includes a pixel circuit. The display substrate further includes: a light detection circuit located on the base and arranged in the non-display area; where the light detection circuit is configured to detect brightness of ambient light.