Display Panel Photo Sensor Voltage Control for Temperature Drift
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Solution Overview
Problem
The characteristics of light receiving elements in photo sensors of display devices, such as liquid crystal and organic light emitting display devices, are affected by temperature changes, leading to reduced accuracy in fingerprint detection and illumination intensity sensing.
Innovation Solution
A display device with integrated temperature sensors and a controller that adjusts the voltage supplied to photo sensors based on temperature, specifically altering the reset voltage and gate-on voltage to maintain a consistent voltage difference, thereby enhancing sensing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the photo sensor uses a fixed voltage supply, then the device structure is simple, but the sensing accuracy decreases when temperature changes
Solution Approach 1:
The patent implements dynamic voltage adjustment by changing the reset voltage and second power voltage based on temperature sensor feedback. The controller modifies these voltages in real-time according to temperature conditions, transforming the static voltage supply into a dynamic system that adapts to environmental changes, thereby maintaining sensing accuracy across different temperatures.
Solution Approach 2:
The patent changes the voltage parameters (reset voltage and second power voltage) as a function of temperature. By adjusting these electrical parameters dynamically based on thermal conditions detected by the temperature sensor, the system compensates for temperature-induced variations in photo sensor characteristics, thus resolving the contradiction between simplicity and accuracy.
2Reliability
If the voltage difference between reset voltage and second power voltage is kept constant, then the circuit design is simple, but the photo sensor characteristics cannot be compensated for temperature variations
Solution Approach 1:
The patent implements a feedback mechanism where the temperature sensor continuously monitors the display panel temperature and provides this information to the controller. The controller then adjusts the reset voltage and second power voltage based on this temperature feedback, creating a closed-loop control system that maintains reliable photo sensor performance despite temperature variations.
Solution Approach 2:
The controller acts as an intermediary between the temperature sensor and the power supply circuits. It receives temperature information, processes it, and generates appropriate voltage adjustment commands to compensate for temperature effects on the photo sensor, thereby mediating between thermal conditions and electrical performance.
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 improves the accuracy of fingerprint detection and illumination intensity sensing by compensating for temperature-induced variations in the photo sensors.
Implementation Method 1
at least one temperature sensor, wherein the at least one temperature sensor is configured to sense a temperature of the display panel
Implementation Method 2
photo sensors each including a light receiving element located between a third power line receiving a reset voltage and the second power line
Data Source
AI summary
A display device includes: a display panel including pixels each having a light emitting element located between a first power source receiving a first power voltage and a second power line receiving a second power voltage, and photo sensors including a light receiving element located between a third power line receiving a reset voltage and the second power line; at least one temperature sensor for sensing a temperature of the display panel; a power supply for supplying the first power voltage, the second power voltage, and the reset voltage; and a controller connected to the temperature sensor and the power supply. The controller controls the power supply such that a voltage value of the reset voltage is changed based on the temperature of the display panel.