Dual-Panel Gamma Voltage Control for AR/VR Luminance Matching
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Solution Overview
Problem
Existing display devices struggle to maintain consistent image quality across multiple display panels, particularly in augmented and virtual reality systems, due to variations in gamma reference voltages between panels.
Innovation Solution
A display device with two display panels and a processor that adjusts gamma reference voltages by comparing and controlling them to ensure they remain within specific reference values, allowing for synchronized luminance levels across both panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple display panels are used in a display device, then the display device can provide image information to users in augmented and virtual reality systems, but the gamma reference voltages between panels vary causing inconsistent image quality
Solution Approach 1:
The patent changes the gamma reference voltage parameter for each display panel based on measured luminance characteristics. The processor adjusts the gamma reference voltage of individual panels to compensate for manufacturing variations, thereby achieving consistent luminance levels and image quality across all panels in the AR/VR display system
Solution Approach 2:
The patent implements a feedback mechanism where the processor measures the actual luminance output of each display panel and uses this information to adjust the gamma reference voltage. This closed-loop control ensures that despite initial panel variations, the final displayed images maintain consistent quality across all panels
2Manufacturing precision
If gamma reference voltages are adjusted to maintain consistent luminance levels, then image quality consistency is improved, but the device complexity increases due to additional control circuits
Solution Approach 1:
The patent makes the processor perform multiple functions: it generates image data for display panels, measures luminance characteristics of each panel, calculates appropriate gamma reference voltage adjustments, and outputs control signals. This multi-functionality eliminates the need for separate dedicated control circuits, achieving precise luminance matching without proportionally increasing device complexity
Solution Approach 2:
The display device performs self-characterization and self-adjustment. The processor automatically measures the luminance characteristics of each panel and adjusts the gamma reference voltages without requiring external calibration equipment or manual intervention, thereby managing the complexity internally while achieving precise luminance consistency
Data Source
AI summary
A display device includes a first display driver circuit that outputs a first gamma reference voltage to a first display panel, and a second display driver circuit that outputs a second gamma reference voltage to a second display panel different from the first display panel, and determines the difference between the first gamma reference voltage and the second gamma reference voltage, and keeps outputting the second gamma reference voltage when the difference is smaller than a first reference value, and changes the second gamma reference voltage when the second gamma reference voltage is less than the first gamma reference voltage and the difference is equal to or greater than the first reference value.