Color Shift Correction for Display Devices
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Solution Overview
Problem
Display devices in VR or AR systems face image quality issues due to color shifts in light emitters, causing visual artifacts and affecting user experience, as different driving current levels lead to mismatched gamut regions and wavelength shifts between light emitters.
Innovation Solution
Implementing color mapping and correction operations that convert input pixel data into updated color coordinates within a common gamut using transformation matrices or look-up tables, and generating separate output color coordinates for each light emitter type to account for their individual color shifts, ensuring precise color representation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If different driving current levels are used for first and second light emitters to represent MSBs and LSBs, then brightness control precision is improved, but color shift occurs between the two light emitter groups
Solution Approach 1:
The patent segments the light emitter array into first light emitters (driven at higher current levels to represent MSBs) and second light emitters (driven at lower current levels to represent LSBs). This segmentation enables precise brightness control through differential current driving while managing color shift effects through separate correction processes for each group.
Solution Approach 2:
The patent changes the driving current level parameter between first and second light emitters, with first light emitters receiving higher current levels and second light emitters receiving lower current levels. This parameter change enables the MSB/LSB representation scheme while requiring compensatory color correction to maintain overall color accuracy.
2Adaptability or versatility
If standard color coordinate space is used for input pixel data, then device compatibility is improved, but color gamut mismatch occurs with the display device's specific gamut
Solution Approach 1:
The patent introduces an intermediary color correction process that transforms standard color coordinate space input pixel data into the display device's specific color gamut. This intermediary transformation enables both broad device compatibility for receiving standard pixel data and precise color gamut accuracy for the specific display device's light emitters.
Data Source
AI summary
A color mapping and correction scheme for processing pixel data allows a display device to account for color shift. The display device drives its light emitters with different current levels. The light emitters exhibit a color shift in gamut. As such, the display device generate light of two different color gamut regions. An input pixel data may include an original color coordinate that is beyond a common color gamut that is common to the two gamut regions. A mapping scheme is used to convert the original color coordinate to an updated color coordinate within the common color gamut. A first output color coordinate that corrected for the shift in first emitters is generated for the operation of the first light emitters based on the updated color coordinate. A second output color coordinate that corrected for the shift in second emitters is also generated based on the updated color coordinate.