Dual-Mode Pixel Circuit for Laser Spot Sensing on Display Panels
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Solution Overview
Problem
Display panels have low light reflectivity, making it difficult for participants to clearly see a light spot generated by a laser pen, which affects the display quality during presentations.
Innovation Solution
A pixel circuit with a driving circuit, selection circuit, light-emitting element, and signal processor that operates in both display and light-sensing modes, allowing the panel to adjust display luminance based on light signal detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a display panel with low light reflectivity is used, then the display can be operated in a dark environment, but the light spot generated by a laser pen cannot be clearly seen
Solution Approach 1:
The pixel circuit is designed to perform multiple functions: it can operate in display mode to show images and in light-sensing mode to detect laser pen light signals. The light-emitting element serves dual purposes as both a display component and a light sensor, enabling the display panel to function as both an output device and an input device for interaction
Solution Approach 2:
The pixel circuit dynamically switches between display mode and light-sensing mode based on operational requirements. The selection circuit controls the operational state, allowing the pixel to transition from displaying static images to detecting dynamic light signals in real-time, thereby adapting to different interaction scenarios
2Adaptability or versatility
If the display panel operates in light-sensing mode to detect laser signals, then interaction capability is improved, but the display function may be affected
Solution Approach 1:
The display panel operates in periodic cycles, alternating between display mode and light-sensing mode. During presentation, the panel displays images; when interaction is needed, it switches to sensing mode to detect laser pen inputs, then returns to display mode to show updated content. This periodic switching ensures both functions are maintained without permanent compromise
Solution Approach 2:
The light-sensing capability provides feedback about user interaction (laser pen position and gestures) to the system. This feedback mechanism enables the display to respond to user input by updating displayed content, thereby maintaining display functionality while adding interaction capability through a closed-loop control system
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
Enhances display quality by allowing the panel to receive light signals and adjust luminance accordingly, improving interaction and clarity during presentations.
Implementation Method 1
the light-emitting element generates a sensing signal by sensing a luminance of a light signal
Data Source
AI summary
A pixel circuit and a display panel are provided. The pixel circuit includes a driving circuit, a selection circuit, a light-emitting element, and a signal processor. The driving circuit is controlled by a data signal. The selection circuit is turned on or off according to a mode of the pixel circuit. In a light-sensing mode, the light-emitting element generates a sensing signal by sensing a luminance of a light signal. The signal processor generates light sensing information according to the sensing signal and a reference voltage.