OLED Current Compensator for Luminance Consistency
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Solution Overview
Problem
Organic light emitting display devices face challenges in maintaining accurate luminance characteristics due to varying loads caused by the number of driven organic light emitting diodes, leading to inconsistencies in current flow and overall display quality.
Innovation Solution
A display device with a current compensator that calculates and compensates for load variations based on input image data, using a combination of load weights calculated by different variables to generate target currents, ensuring accurate luminance compensation and improved display panel driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of driven organic light emitting diodes increases, then the display device can display more comprehensive image content, but the load increases causing current flow variation and luminance characteristic deterioration
Solution Approach 1:
The current compensator performs preliminary calculation of the load based on input image data before the actual display rendering. By predicting the load that will be generated by the image content and pre-compensating the current, the system prevents luminance characteristics deterioration before it occurs, ensuring consistent display quality across different image content and device configurations
Solution Approach 2:
The system implements a feedback mechanism where the current compensator continuously monitors input image data, calculates the resulting load, and adjusts the driving current accordingly. This closed-loop control ensures that despite variations in the number of driven OLEDs, the luminance characteristics remain consistent by dynamically compensating for load-induced current variations
2Adaptability or versatility
If the load varies due to different numbers of driven organic light emitting diodes, then the display device can accommodate different display scenarios, but the current flow through the diodes varies leading to luminance inconsistency
Solution Approach 1:
The current compensator dynamically changes the driving current parameters based on the calculated load. By adjusting the current magnitude according to the number of active OLEDs and the displayed image content, the system maintains consistent luminance output across different display scenarios, effectively decoupling the relationship between load variations and luminance inconsistency
3Device complexity
If a simple current control method is used, then the device complexity is reduced, but accurate luminance compensation cannot be achieved considering multiple load-affecting variables
Solution Approach 1:
The current compensator is designed as a multi-functional unit that performs multiple operations: calculating load based on input image data, determining the number of driven OLEDs, computing the combined load effect, and generating compensated driving current. This universal compensator handles all luminance compensation tasks through a single integrated component, achieving high compensation accuracy without proportionally increasing overall device complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables precise luminance compensation, enhancing the overall luminance characteristics and display quality of the organic light emitting display device while maintaining low power consumption.
Implementation Method 1
an organic light emitting diode that generates light by recombination of electrons and holes
Data Source
AI summary
A display device includes a display panel which displays an image, a current compensator and a panel driver. The current compensator calculates a load based on input image data and compensates the input image data to output compensation image data having a target current corresponding to the load. The panel driver drives the display panel based on the compensation image data. The current compensator calculates the load for the input image data based on a combination of load weights calculated by different variables.