OLED Timing Controller Luminance Compensation
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Solution Overview
Problem
Organic light emitting diode (OLED) displays face luminance non-uniformity issues due to voltage drops and different threshold voltages, affecting display quality and grayscale representation.
Innovation Solution
A display device and driving method that utilize a timing controller to form frames comprising a main frame, a compensation frame, and a blank frame, with the compensation frame adjusting luminance values to counteract voltage drops and threshold differences, ensuring consistent grayscale representation across the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a digital driving method is used to control pixel on-time based on frame subdivision, then response speed and power consumption are improved, but luminance non-uniformity worsens due to voltage drops and threshold voltage differences
Solution Approach 1:
The patent applies preliminary action by measuring the luminance of each pixel before the actual image display and pre-calculating compensation values. The compensation frame is generated in advance based on measured luminance data, correcting for voltage drops and threshold voltage differences before they affect the main image display. This ensures luminance uniformity is addressed proactively rather than reactively.
Solution Approach 2:
The patent segments the display frame into multiple functional components: a main frame for normal image display, a compensation frame for luminance correction, and blank frames for black grayscale representation. This segmentation allows independent optimization of each component - the main frame maintains high-speed digital driving while the compensation frame addresses luminance non-uniformity through separate measurement and correction processes.
2Area of stationary object
If the display size is increased, then the display area is improved, but voltage drops increase causing worsened luminance uniformity
Solution Approach 1:
The patent applies local quality by measuring and compensating luminance characteristics individually for different regions of the display. The luminance measurer captures region-specific luminance data, and the compensation process generates location-dependent correction values. This allows each area of the display to receive customized compensation tailored to its specific voltage drop characteristics, ensuring uniform luminance across the entire large display area.
3Ease of manufacture
If threshold voltage differences between OLED elements are present, then device manufacturing variability is improved, but luminance consistency worsens
Solution Approach 1:
The patent applies self-service by enabling the display system to automatically measure its own luminance characteristics and generate compensation data without external intervention. The luminance measurer and sub-frame generator work autonomously to detect threshold voltage differences across OLED elements and create appropriate compensation frames, allowing the system to self-correct for manufacturing variability while maintaining luminance consistency.
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 effectively compensates for luminance non-uniformity, enhancing the display's ability to accurately represent grayscale values and improving overall image quality by adjusting the luminance of each frame accordingly.
Implementation Method 1
This diode generates light based on the recombination of electrons and holes in a active layer
Data Source
AI summary
A display device includes a timing controller for controlling the display of an image. The timing controller forms a frame for an image signal based on a main frame, a compensation frame, and at least one blank frame. The timing controller also determines a driving method for the display pixels to generate output image data. The main frame serves to display the image signal. The compensation frame serves to compensate luminance of the main frame. The blank frame serves to express a black gray scale value.