Source Driver Voltage Compensation for OLED Luminance Uniformity
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Solution Overview
Problem
In OLED display apparatuses, the change in the number of pixel unit groups displaying leads to abrupt changes in voltage drops on the power trace, causing non-uniform light emitting luminance across the display.
Innovation Solution
A data driving method for a source driver that compensates the data voltage loaded to pixel units in response to specific instructions, adjusting for changes in voltage drops on the power trace during transitions between different display states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of pixel unit groups displaying is changed, then the display adaptability is improved, but the voltage drop on the power trace changes abruptly causing non-uniform luminance
Solution Approach 1:
The source driver performs preliminary compensation by calculating and applying a compensation voltage to the data voltage before the pixel unit groups switch between display states. This preliminary action prevents the abrupt luminance change by anticipating the voltage drop variation that will occur when the number of active pixel unit groups changes.
Solution Approach 2:
The patent changes the data voltage parameter dynamically based on the number of pixel unit groups in the first display state versus the second display state. By adjusting the data voltage according to the difference in voltage drops between different display states, the system maintains uniform luminance across all pixel units regardless of the number of active groups.
2Manufacturing precision
If data voltage compensation is applied, then the luminance uniformity is improved, but the device complexity increases due to additional compensation calculations and control instructions
Solution Approach 1:
The source driver performs self-service by internally calculating and applying the compensation voltage without requiring external intervention. The driver uses its own computational resources to determine the compensation amount based on the display state configuration, eliminating the need for additional external compensation circuits or complex control systems.
Solution Approach 2:
Instead of adding complex hardware circuits, the patent achieves luminance uniformity by changing the data voltage parameter through software-controlled compensation. This approach maintains device complexity at a manageable level while achieving the desired luminance uniformity through parameter adjustment rather than hardware expansion.
Data Source
AI summary
A data driving method for a source driver in a display apparatus is provided, the display apparatus includes a display panel and the source driver; and the display panel includes: a power trace extending along a first direction, pixel unit groups sequentially arranged away from the input side of the power supply along the first direction, and data lines; the display apparatus includes first and second display states; A and B pixel unit groups are preset for displaying in first and second display states, respectively, A≠B; the method includes: in a first switching process of switching the display apparatus from first to second display states, compensating a data voltage to be loaded to the pixel units in response to a first data compensation start instruction, to compensate a change in a voltage drop on the power trace in the first and second display states different from each other.