Display Dimming Controller Gamma Voltage Interpolation
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Solution Overview
Problem
Display devices experience an undesirable luminance inversion phenomenon when adjusting dimming levels, leading to inefficient power consumption and delayed light emission in low-grayscale regions due to changes in power voltage.
Innovation Solution
A display device with a dimming controller that performs interpolating operations on band voltage sets to generate grayscale gamma voltages, adjusting power voltage levels based on target luminance, thereby preventing significant luminance inversion and enabling smooth dimming level changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If power voltage is adjusted according to dimming level, then power consumption is reduced and light emission delay is prevented, but luminance inversion phenomenon occurs
Solution Approach 1:
The patent changes the parameter of power voltage according to dimming levels to reduce power consumption and prevent light emission delay. By dynamically adjusting the power voltage parameter based on the current dimming level, the system achieves energy efficiency while maintaining display performance.
Solution Approach 2:
The patent implements a feedback mechanism where the luminance inversion phenomenon is detected and corrected by adjusting the gamma voltage. The system monitors the output luminance and provides feedback to the gamma voltage generator to compensate for any inversion effects, ensuring stable and accurate display output.
2Illumination intensity
If gamma curve is adjusted to change luminance, then dimming level is controlled, but luminance inversion phenomenon occurs due to power voltage change
Solution Approach 1:
The patent adjusts the gamma curve parameters to control luminance output for different dimming levels. By modifying the gamma voltage parameters in response to dimming level changes, the system achieves precise luminance control while compensating for power voltage variations that would otherwise cause luminance inversion.
Solution Approach 2:
The system uses feedback control where the gamma voltage is dynamically adjusted based on the detected luminance output and the current power voltage level. This feedback mechanism ensures that luminance inversion is prevented by continuously correcting the gamma voltage to maintain the desired luminance output.
3Speed
If power voltage is adjusted for low-grayscale region, then light emission delay is prevented, but luminance inversion occurs
Solution Approach 1:
The patent applies parameter changes by adjusting power voltage specifically for low-grayscale regions to improve light emission response speed. This targeted parameter adjustment enhances the responsiveness of the display in dark regions without causing luminance inversion through coordinated gamma voltage adjustment.
Solution Approach 2:
The patent applies local quality by implementing different power voltage adjustment strategies for different grayscale regions. Specifically, the power voltage is adjusted for low-grayscale regions to prevent light emission delay, while the gamma voltage is simultaneously adjusted to compensate for any luminance inversion effects in those same regions.
Data Source
AI summary
A display device includes a display panel, a dimming controller, and a panel driver. The display panel includes a plurality of pixels. The dimming controller generates at least one temporary voltage set by performing a first interpolating operation using a (j)th band voltage set and a (j+1)th band voltage set among first through (i)th band voltage sets corresponding to first through (i)th dimming bands, respectively, and generates a grayscale gamma voltage set corresponding to target luminance by performing a second interpolating operation using the temporary voltage set and the (j)th band voltage set. The panel driver drives the display panel by converting image data into a data signal based on the grayscale gamma voltage set and by providing the data signal to the pixels.