Display Panel Low-Voltage Sensing for Uniform Luminance Compensation
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Solution Overview
Problem
Existing display devices face issues with non-uniform display quality due to changes in low voltage caused by current resistance (IR) affecting subpixels, leading to luminance deviations in gradation forms.
Innovation Solution
Incorporation of a sensing switch and sensing circuit to directly sense the low voltage line for each subpixel, allowing for compensation of voltage changes based on current resistance, using a timing controller to adjust data signals accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If subpixels are supplied with driving signals without compensation, then the display device can operate, but display quality becomes non-uniform due to voltage changes from current resistance
Solution Approach 1:
The display panel is divided into multiple segments, each with its own sensing switch and sensing circuit. Each segment independently senses and compensates for voltage changes, allowing localized correction without requiring system-wide complexity. The sensing switches are disposed at different positions to sense low voltage lines for different color subpixels separately.
Solution Approach 2:
Sensing switches are introduced as intermediary components between the low voltage lines and data lines. These sensing switches enable indirect sensing of low voltage through the data line, allowing voltage measurement without direct connection to the low voltage line, thus maintaining circuit isolation while enabling compensation.
2Measurement precision
If sensing switches are added to each subpixel, then voltage compensation becomes possible, but device complexity and manufacturing cost increase
Solution Approach 1:
The sensing switches serve multiple functions: they sense low voltage lines for compensation, and can also function as regular switching elements in the display circuit. The same data lines are used for both data transmission and sensing purposes during different time periods, reducing the need for separate dedicated sensing circuits.
Solution Approach 2:
The sensing operation is performed periodically by controlling sensing switches to operate at specific times. During sensing periods, sensing switches are activated to measure voltage, while during display periods, normal data transmission occurs. This time-division multiplexing allows voltage compensation without continuously adding circuit complexity.
3Adaptability or versatility
If low voltage lines are directly sensed for each color, then compensation values can be prepared for each color, but the sensing circuit complexity increases
Solution Approach 1:
The sensing system is segmented by color, with separate sensing switches and sensing circuits for red, green, and blue subpixels. Each sensing circuit independently measures and compensates voltage changes for its corresponding color, enabling precise color-specific compensation without requiring a single complex unified sensing system.
Data Source
AI summary
Provided is a display device including a display panel including subpixels connected to a low voltage line configured to deliver a low voltage and a data line configured to deliver a data voltage, a sensing switch configured to electrically connect the low voltage line and the data line, and a data driver including a sensing circuit configured to sense the low voltage line through the data line to prepare a sensed value when the sensing switch operates.