OLED Brightness Compensation via Multi-Scan Row Control
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Solution Overview
Problem
OLED display apparatuses face non-uniform light emission due to differences in luminous efficiencies of OLED devices at various positions, leading to uneven brightness across the display.
Innovation Solution
A brightness compensation method where each row of display units is turned on multiple times during a frame, with a compensation signal applied to underperforming units and others set to black, ensuring equal brightness perception by prolonging light emission in darker areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If OLED devices are used for display, then advantages such as self-luminescence, light weight, small thickness, low power consumption, high contrast, and high color gamut are achieved, but non-uniformity in light emission occurs due to differences in luminous efficiencies at different positions
Solution Approach 1:
The patent applies local quality by differentiating the treatment of display units based on their luminous efficiency characteristics. Display units are classified into first display units (higher luminous efficiency) and second display units (lower luminous efficiency), and different scanning strategies are applied to each group. This local differentiation allows the system to compensate for manufacturing variations while maintaining overall brightness uniformity across the display panel.
Solution Approach 2:
The patent implements periodic action by scanning different groups of display units in alternating frame periods. First display units are scanned in odd frame periods while second display units are scanned in even frame periods. This periodic scanning pattern allows each display unit type to be updated at the same frequency while maintaining different timing, thereby compensating for luminous efficiency differences and achieving uniform brightness perception.
2Illumination intensity
If each row of display units is turned on multiple times during a frame for brightness compensation, then brightness uniformity is improved, but the complexity of the scanning control increases
Solution Approach 1:
The patent applies segmentation by dividing the display panel into multiple groups of display units based on their luminous efficiency characteristics. Each group is assigned a different scanning schedule (odd frame periods vs. even frame periods). This segmentation simplifies the control logic compared to individually controlling each pixel, as the complexity is reduced to managing a small number of groups rather than individual pixels.
Solution Approach 2:
The patent implements dynamics by making the scanning control adaptive to the luminous efficiency characteristics of different display units. The system dynamically adjusts which groups are scanned in which frame periods based on pre-characterized luminous efficiency data. This dynamic approach allows the system to automatically compensate for manufacturing variations without requiring complex real-time measurements or adjustments.
Data Source
AI summary
A brightness compensation method for a display apparatus, and a display apparatus are disclosed. The brightness compensation method includes: for each row of display units, turning on the row S times during a display time of one frame; inputting, to each display unit in the row a pixel data signal of the frame corresponding to the display unit, when the row is turned on for the i-th time; inputting, to a to-be-compensated display unit in the row, a compensation signal, and controlling other display unit than the to-be-compensated display unit in the row to present black, when the row is turned on for each time other than the i-th time; wherein both S and i are integers, S≥2, 1≤i≤S; for every two adjacent rows of display units, a time interval of same turning-ons of the latter and the former is the same.