Photosensitive Transistor Display Panel for Laser Projection
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Solution Overview
Problem
Liquid crystal displays are incompatible with laser pointers for projection, as the laser cannot project effectively when used with existing liquid crystal display technology.
Innovation Solution
A display panel and device featuring an array substrate with gate and data lines, a common electrode, and photosensitive transistors connected to pixel circuit units, where the voltage is pulled down to the common electrode when the photosensitive transistors absorb external light, allowing selective control of liquid crystal deflection and color display, enabling projection by blocking light in areas irradiated by the laser pointer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional liquid crystal display is used, then normal color display is achieved, but laser pointer projection is not compatible
Solution Approach 1:
The pixel circuit is divided into two independent transistors: a conventional switching transistor (T1) for normal display control and a photosensitive transistor (T2) for laser projection detection. This segmentation allows each transistor to perform its specific function without interfering with the other, enabling both normal display and laser projection modes to coexist in the same display device.
Solution Approach 2:
The photosensitive transistor acts as an intermediary component that detects laser light and converts it into electrical signals. This intermediary mechanism bridges the gap between optical input (laser pointer) and electrical control (pixel voltage), enabling laser projection functionality without disrupting the conventional liquid crystal display operation.
2Adaptability or versatility
If photosensitive transistors are added to enable laser projection, then laser pointer compatibility is improved, but manufacturing complexity increases
Solution Approach 1:
The photosensitive transistor utilizes the inherent photosensitive property of the semiconductor material (such as zinc oxide or indium gallium zinc oxide) to change its electrical conductivity based on light exposure. This parameter change mechanism allows the transistor to automatically switch states in response to laser light without requiring additional control circuits or complex manufacturing processes.
Solution Approach 2:
The photosensitive transistor is self-activating through its material properties. When laser light strikes the transistor, the photosensitive material automatically generates electrical signals that control the pixel state, eliminating the need for external control circuits or additional actuators. This self-service mechanism simplifies the overall system while enabling laser projection functionality.
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
Enables the use of laser pointers for projection by creating black areas on the display where the laser is focused, while maintaining normal color display elsewhere, thus solving the incompatibility issue between laser pointers and liquid crystal displays.
Implementation Method 1
a plurality of photosensitive transistors, electrically connected with the plurality of pixel circuit units, and the common electrode; wherein a voltage of each of the pixel circuit units is pulled down to a voltage of the common electrode, when each of the photosensitive transistors is turned on by receiving external light
Implementation Method 2
when the photosensitive transistor does not absorb external light, the photosensitive transistor is off and the voltage applied to the vertically aligned (VA) liquid crystal is normal
Data Source
AI summary
Embodiments of the present disclosure provide a display panel comprising an array substrate, wherein the array substrate comprises a common electrode with a low-level voltage, pixel circuit units and photosensitive transistors. The pixel circuit units are electrically connected to gate lines, data lines and the common electrode. And the photosensitive transistors are electrically connected with the pixel circuit units and the common electrode.