Camera Under Display Brightness Compensation via Aperture Ratio
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Solution Overview
Problem
Camera Under Display (CUD) technology faces challenges in achieving adequate brightness compensation due to the limited transparency of OLED screens, leading to image mismatches between CUD and non-CUD areas, and potential display failures from uneven pixel stress.
Innovation Solution
The solution involves calculating and applying boosted subpixel values or current boost factors based on the ratio of non-CUD to CUD subpixel aperture areas, using equations to ensure the aggregate brightness of CUD area subpixels matches that of non-CUD area subpixels, thereby compensating for brightness disparities and reducing visual artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a smaller aperture in the CUD area is used to compensate for lower OLED transmittance, then brightness is improved, but image mismatch occurs between CUD and non-CUD areas due to inadequate compensation for brightness, color chromaticity, and saturation points
Solution Approach 1:
The patent applies different aperture sizes to different regions: a first aperture size for CUD area subpixels and a second aperture size for non-CUD area subpixels. This local differentiation allows optimization of brightness in the CUD region while maintaining image quality and color consistency across the entire display, preventing image mismatch between regions.
Solution Approach 2:
The patent changes the aperture size parameter specifically in the CUD area to compensate for lower OLED transmittance. By adjusting this physical parameter locally, the system achieves adequate brightness compensation while maintaining overall image quality through coordinated control of multiple subpixel parameters.
2Manufacturing precision
If a higher-resolution sensor is used to compensate for lower transmittance, then image quality is improved, but device thickness increases undermining the thin and lightweight form factor goal
Solution Approach 1:
Instead of increasing sensor resolution, the patent changes the aperture size parameter to compensate for lower transmittance. This alternative parameter adjustment achieves adequate image quality compensation without requiring a higher-resolution sensor, thereby maintaining the thin and lightweight form factor.
3Loss of energy
If an asymmetric aperture structure is used to increase transparency in the CUD area, then transmittance is improved, but image artifacts occur due to imbalance in pixel tone caused by lower aperture and increased transparency
Solution Approach 1:
The patent implements local quality enhancement by using a larger aperture size specifically for CUD area subpixels compared to non-CUD area subpixels. This localized adjustment compensates for lower OLED transmittance in the CUD region while maintaining balanced pixel tone across the display, preventing image artifacts.
Solution Approach 2:
The patent employs brightness compensation algorithms that use feedback from detected brightness levels to dynamically adjust subpixel values. This feedback mechanism ensures that the asymmetric aperture structure produces balanced visual output by compensating for tone imbalances through software control.
4Ease of manufacture
If CUD pixels are operated at the same current density as non-CUD pixels, then manufacturing simplicity is maintained, but visual artifacts become noticeable in high grey scale areas due to imbalanced pixel tone
Solution Approach 1:
The patent applies different current density characteristics to CUD and non-CUD pixels through the aperture size differentiation. CUD area subpixels use a first current density while non-CUD area subpixels use a second current density, optimizing pixel tone balance in high grey scale areas while maintaining manufacturing simplicity through a straightforward aperture design.
5Device complexity
If CUD technology is implemented with standard aperture structures, then device complexity is reduced, but display reliability decreases due to pixels being driven at different stress points leading to potential display failure
Solution Approach 1:
The patent uses different aperture sizes for CUD and non-CUD area subpixels to create localized stress distribution. This approach balances the stress points across different pixel regions, preventing premature display failure while maintaining relatively simple device architecture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively enhances the brightness of CUD area subpixels, achieving visual consistency across the display while minimizing the risk of display failure by harmonizing RGB curves and regulating overcompensation, thus ensuring optimal display performance and longevity.
Implementation Method 1
Organic Light-Emitting Diode (OLED) screens
Data Source
Figure 1A~1B
Figure 2~5
Figure 3A~3C
AI summary
A device, including: processing circuitry operable to determine boosted subpixel values for subpixels in a camera under display (CUD) area of a display panel, wherein each boosted subpixel value is based on a ratio of a non-CUD subpixel aperture area to a CUD subpixel aperture area for a corresponding subpixel of the display panel; and a display driver operable to boost a brightness of each subpixel in the CUD area based on the respective boosted subpixel value.