Display Luminance Compensation with Initialization Duty-Ratio Control
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Solution Overview
Problem
Light emitting display devices experience non-uniform luminance characteristics when the operating frequency varies, leading to inconsistent image quality.
Innovation Solution
A luminance compensation method that adjusts the duty ratio of the initialization control signal based on comparisons between measured luminances at different operating frequencies, ensuring uniform luminance characteristics by calculating and adjusting the duty ratio accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the operating frequency is varied to improve display performance, then the response speed increases, but the luminance uniformity deteriorates
Solution Approach 1:
The patent applies dynamics by making the duty ratio of the initialization control signal adjustable based on the operating frequency. The panel driver dynamically changes the duty ratio according to the current operating frequency to compensate for luminance variations, thereby maintaining luminance uniformity across different frequency operations while preserving the fast response speed benefit of variable frequency driving.
Solution Approach 2:
The patent changes the duty ratio parameter of the initialization control signal to compensate for luminance variations caused by different operating frequencies. By measuring luminance at different frequencies and calculating appropriate duty ratio adjustments, the system modifies this key parameter to maintain consistent luminance characteristics across variable frequency operations.
2Stability of the object's composition
If the duty ratio of the initialization control signal is adjusted to compensate for luminance variations, then the luminance uniformity improves, but the device complexity increases
Solution Approach 1:
The patent implements feedback by measuring the luminance at different operating frequencies and using this measurement to calculate and adjust the duty ratio of the initialization control signal. The panel driver continuously monitors luminance characteristics and adjusts the duty ratio accordingly, creating a closed-loop control system that maintains luminance uniformity without requiring complex external intervention.
Solution Approach 2:
The panel driver performs self-service by autonomously measuring luminance variations and adjusting its own control signals. The system includes built-in functionality to measure luminance at different frequencies, calculate the appropriate duty ratio compensation, and apply the adjusted initialization control signal, eliminating the need for external compensation devices or complex additional circuitry.
Data Source
AI summary
A luminance compensation method of a display device includes a first luminance for a reference grayscale at a first operating frequency and a second luminance for the reference grayscale at a second operating frequency are measured. A first reference value is calculated based on the first luminance and the second luminance, a first duty ratio of the initialization control signal is changed into a second duty ratio depending on a comparison result of the first reference value and a threshold value After the first duty ratio is changed into the second duty ratio, a third luminance for the reference grayscale is measured, and a second reference value is calculated based on the first luminance and the third luminance. A final duty ratio corresponding to the threshold value is calculated depending on a comparison result of the second reference value and the threshold value.