Display Device Data Compensator for Luminance Deviation
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Solution Overview
Problem
Display devices experience luminance deviations due to variations in signals from other components in the pixel circuit, leading to reduced display quality, especially at low driving frequencies.
Innovation Solution
A display device comprising a display panel, a scan driver, a data compensator, and a data driver, where the data compensator detects patterns of significant grayscale value differences and generates compensated image data to adjust grayscale values in affected areas, thereby minimizing luminance deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the display device operates at low driving frequency, then energy consumption is reduced, but luminance deviation increases due to leakage current and hysteresis
Solution Approach 1:
The patent applies preliminary action by supplying initialization voltage to the light emitting element before the data signal is applied. This preliminary initialization action compensates for the hysteresis characteristic and leakage current that occur at low driving frequencies, ensuring accurate luminance representation without increasing energy consumption during the actual image display period.
2Manufacturing precision
If initialization voltage is supplied multiple times during one frame, then luminance variation is minimized, but display quality deteriorates due to luminance deviation from parasitic capacitor
Solution Approach 1:
The patent implements feedback by detecting the actual luminance of the light emitting element after initialization and comparing it with the expected luminance. Based on this feedback information, the system adjusts the data signal to compensate for any deviation caused by parasitic capacitors, ensuring accurate luminance representation while maintaining the benefits of multiple initialization voltage supplies.
3Speed
If data signal is applied immediately after initialization, then response time is reduced, but luminance accuracy decreases due to parasitic capacitor influence
Solution Approach 1:
The patent applies preliminary action by completing the initialization voltage supply and stabilization before the data signal is applied. This ensures that the light emitting element is fully prepared to receive accurate data signals, maintaining luminance accuracy while minimizing the overall response time through efficient timing of the initialization and data application phases.
Data Source
AI summary
A display device includes a display panel, a scan driver, a data compensator, and a data driver. The display panel includes a first area and a second area distinguished from each other along a scan direction. Each of the first and second areas include pixels. The scan driver is configured to sequentially provide scan signals to the display panel along the scan direction. The data compensator is configured to: detect a pattern in which a difference between adjacent grayscale values in image data is greater than a reference value; and generate compensated image data by compensating for grayscale values corresponding to the second area in the image data based on the pattern corresponding to the first area. The data driver is configured to: generate data signals based on the compensated image data; and provide the data signals to the display panel.