Display Device Variable Reference Voltage Sensing
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Solution Overview
Problem
High-resolution or high-frequency display devices face challenges in ensuring sufficient time for subpixel sensing and compensation, leading to potential deterioration of display panel elements.
Innovation Solution
The display device incorporates a sensing circuit with a first voltage circuit to apply a variable first reference voltage based on the driving frequency, allowing for reduced sensing time and improved compensation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the resolution and driving frequency of display devices are increased, then the display quality and performance are improved, but the sensing time for subpixels becomes insufficient leading to element deterioration
Solution Approach 1:
The sensing operation is performed in advance during a dedicated sensing period before the data writing period. By preliminarily sensing the subpixel states and storing them in sensing storage units, the system prepares compensation data ahead of time, ensuring that even at high driving frequencies, the sensing operation completes within the allocated time window without compromising the main display refresh cycle.
Solution Approach 2:
The sensing period duration is dynamically adjusted based on the driving frequency. When the driving frequency increases, the sensing period is extended to provide sufficient time for accurate sensing. This dynamic adjustment allows the system to maintain adequate sensing time across different operating conditions while maximizing display performance.
2Measurement precision
If the sensing time is extended to ensure accurate sensing, then the compensation performance is improved, but the display refresh rate decreases
Solution Approach 1:
The display driving cycle is segmented into distinct periods: a sensing period dedicated to subpixel sensing operations, a data writing period for updating pixel data, and a compensation period for applying corrections. By separating the sensing operation into its own dedicated time slot, the system ensures sufficient sensing time without extending the overall display refresh cycle, thus maintaining high refresh rates while achieving accurate sensing.
Solution Approach 2:
Sensing operations are performed preliminarily during the sensing period before data writing begins. This preliminary sensing allows the system to capture subpixel states early in the cycle, and the sensed data is stored for later compensation application, ensuring both sensing accuracy and timely display updates.
3Productivity
If the sensing operation is performed quickly to maintain high refresh rates, then the display performance is maintained, but the compensation accuracy deteriorates
Solution Approach 1:
The sensing period duration is dynamically adjusted based on driving frequency to maintain adequate sensing time. Additionally, the compensation operation is dynamically scheduled to occur after data writing completes, ensuring that compensation accuracy is not compromised by time constraints while maintaining high refresh rates through efficient period management.
Solution Approach 2:
The sensing operation is performed in advance during the sensing period, and results are stored in sensing storage units before data writing begins. This preliminary sensing ensures that even with quick operation, the sensing process has sufficient time to complete accurately, and the stored sensing data can be used for precise compensation without rushing the measurement process.
Data Source
AI summary
A display device can include a display panel including subpixels connected to data lines and reference lines, a driving circuit connected to the data lines, a sensing circuit including a first voltage circuit connected to the reference lines and configured to apply a first reference voltage to initialize sensing nodes of the subpixels, and a sampling circuit configured to perform a sampling operation to sense the sensing nodes of the subpixels. Also, the display device can further include a timing controller configured to generate a first reference voltage control signal for varying a level of the first reference voltage based on a driving frequency of the display panel.