Display Voltage Setting for Stable Color Across Refresh Changes
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Solution Overview
Problem
Display devices experience luminance and color changes during frequency change driving, which affect display quality.
Innovation Solution
A voltage setting method is implemented to minimize luminance and color changes by individually setting the difference value between anode initialization voltage and first power voltage for each color, adjusting anode initialization voltage changes based on refresh rate variations, and using different anode initialization voltages for pixels emitting different colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If frequency change driving is implemented to improve driving efficiency and minimize power consumption, then power consumption is reduced, but luminance change and color change occur during frequency transition
Solution Approach 1:
The patent applies parameter changes by adjusting the anode initialization voltage based on the refresh rate. When the refresh rate changes, the anode initialization voltage is modified to compensate for luminance and color shifts. Specifically, the anode initialization voltage in the blank period is set differently from that in the active period, and different change amounts are applied to different color pixels (RGB) to maintain display quality during frequency transitions.
2Device complexity
If a single anode initialization voltage is used for all pixels, then device complexity is reduced, but luminance and color changes cannot be minimized across different pixel types
Solution Approach 1:
The patent implements local quality by applying different anode initialization voltage change amounts to different color pixels. Each pixel type (red, green, blue) receives a customized voltage adjustment tailored to its specific characteristics. This allows each pixel group to be optimized independently for minimal luminance and color change during frequency transitions, rather than using a uniform voltage change for all pixels.
3Ease of operation
If anode initialization voltage is kept constant during frequency change, then ease of operation is maintained, but luminance and color stability deteriorates
Solution Approach 1:
The patent applies dynamics by making the anode initialization voltage adaptive rather than static. The voltage dynamically adjusts based on the refresh rate and pixel type. The system automatically modifies the anode initialization voltage in response to frequency changes, with different dynamic adjustment patterns for different pixel colors, thereby maintaining stability without requiring manual intervention.
4Reliability
If different anode initialization voltages are applied to each pixel type, then display quality is improved, but device complexity increases
Solution Approach 1:
The patent implements segmentation by dividing the pixel population into distinct color groups (red, green, blue) and applying customized anode initialization voltage adjustments to each segment. This segmentation allows for optimized voltage control for each pixel type, minimizing luminance and color changes. The voltage management is segmented by time period as well, with different voltage settings for active and blank periods.
Data Source
AI summary
A voltage setting method of a display device includes setting a first power voltage provided to a cathode of a light emitting element of each of pixels, setting a difference value between an anode initialization voltage provided to an anode of the light emitting element and the first power voltage so that a luminance change according to a frequency change is minimized, and resetting the difference value so that a color change according to the frequency change is minimized.