Pixel Sensing Amplifier Precharge Voltage Crosstalk
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Solution Overview
Problem
Existing pixel sensing techniques face challenges in accurately sensing pixel characteristics due to variations in pixel characteristics over time or environmental changes, leading to image quality degradation, precharge voltage deviations, and crosstalk issues between sensing lines, which can result in defects like screen spots and line dimming.
Innovation Solution
A pixel sensing device with an amplifier to output precharge voltage and receive sensing signals, an analog-to-digital converter to convert sensing voltage into digital data, and a transmitting circuit to compensate image data, while minimizing the size of the sensing device by using a single amplifier to manage precharge voltage and prevent crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple sensing lines are connected to a single supply line for precharge voltage, then device complexity is reduced, but precharge voltage deviation occurs due to line resistance causing image quality degradation
Solution Approach 1:
The patent divides the single supply line into multiple separate supply lines, with each supply line dedicated to charging a specific sensing line. This segmentation eliminates voltage deviation caused by line resistance while maintaining relatively simple device structure.
2Device complexity
If sensing lines are simultaneously supplied with precharge voltage through one supply line, then device complexity is reduced, but crosstalk problem occurs between sensing lines causing inaccurate sensing
Solution Approach 1:
The patent assigns separate supply lines to each sensing line, preventing current from one sensing line from flowing to another through the supply line. This eliminates crosstalk while maintaining structural simplicity.
3Device complexity
If pixel characteristics are not compensated, then device complexity is reduced, but image quality degrades due to brightness variation from transistor threshold voltage changes
Solution Approach 1:
The patent implements a feedback mechanism where the sensing device measures actual pixel characteristics (such as threshold voltage variations) and transmits this information back to the source driver. The source driver then compensates the data voltage based on the sensed characteristics, ensuring uniform image quality while maintaining reasonable device complexity.
Data Source
AI summary
An embodiment relates to a pixel sensing technique. By supplying a precharge voltage to a sensing line using an amplifier used in pixel sensing, it is possible to minimize differences between precharge voltages of sensing lines and solve a crosstalk problem between the sensing lines, while not increasing a size of a pixel sensing device.