Display Panel Sensing With Variable Sampling Under Power Fluctuation
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Solution Overview
Problem
Display devices face challenges in maintaining consistent sensing voltages due to fluctuations in power levels, leading to inaccuracies and errors in image display.
Innovation Solution
A display device with a variable sampling point in the sensing circuit that adjusts based on changes in power levels, using a timing controller to calculate and compensate for power fluctuations, thereby maintaining a uniform sensing voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed sampling point is used in the sensing circuit, then the device complexity is reduced, but the sensing accuracy deteriorates when power levels fluctuate
Solution Approach 1:
The sampling point is made variable instead of fixed, allowing it to be dynamically adjusted based on power level conditions. The timing controller changes the sampling timing according to the actual power level, enabling the sensing circuit to adapt to power fluctuations and maintain accurate sensing without requiring overly complex compensation mechanisms.
Solution Approach 2:
The sampling timing parameter is changed based on power level conditions. When the power level deviates from the reference level, the timing controller adjusts the sampling point timing accordingly, transforming the sensing system from a static to a parameter-adaptive configuration that maintains measurement precision across varying power conditions.
2Measurement precision
If the sampling time is adjusted to compensate for power level changes, then the sensing accuracy is improved, but the device complexity increases due to additional control mechanisms
Solution Approach 1:
The timing controller receives feedback about the actual power level (comparing it with the reference level) and uses this information to adjust the sampling point timing. This closed-loop feedback mechanism enables automatic compensation for power fluctuations, improving sensing accuracy while keeping the control logic integrated within the existing timing controller rather than requiring separate complex compensation circuits.
3Reliability
If a variable sampling point is implemented to maintain constant sensing voltage, then the sensing reliability is improved under varying power conditions, but the device complexity increases
Solution Approach 1:
The timing controller is given a dual function: it continues to perform its primary timing control role while also functioning as the power level-based sampling point adjuster. By making the timing controller multi-functional rather than adding a separate dedicated circuit, the sensing reliability is improved under varying power conditions while minimizing the increase in overall device complexity.
Data Source
AI summary
A display device includes a display panel including a subpixel connected to a power line, a data line, and a reference line; a power supply configured to supply power to the display panel through the power line; a data driver including a driving circuit configured to supply a data voltage to the display panel through the data line, and a sensing circuit configured to sense the display panel through the reference line; and a timing controller configured to control the power supply and the data driver, wherein the sensing circuit may have a variable sampling point for sensing the display panel in response to a change in a level of the power.