Under-screen Camera White Balance Compensation via Driver IC
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Solution Overview
Problem
The challenge of achieving consistent white balance and color consistency in under-screen cameras due to variations in transmittance rates and manufacturing differences of OLED screens, leading to poor imaging quality and blurriness.
Innovation Solution
A display device with a photosensitive element and a driver integrated circuit (IC) that performs white balance compensation by calculating and applying compensation values based on deviations in color parameters, using a formula that adjusts red, green, and blue light intensity ratios to match a preset typical display device's parameters, ensuring consistent white balance across a batch of devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a photosensitive element is disposed under the screen, then the screen-to-body ratio is improved, but the white balance color consistency deteriorates due to transmittance rate differences and manufacturing variations
Solution Approach 1:
The patent applies parameter changes by adjusting the white balance imaging parameters (R/G and B/G ratios) of the photosensitive element based on the specific transmittance characteristics of each OLED screen. The driver IC calculates compensation values by comparing actual color parameters with standard values, then modifies the imaging parameters to compensate for screen-specific variations, thereby resolving the white balance inconsistency caused by manufacturing differences while maintaining the under-screen configuration
Solution Approach 2:
The patent implements feedback by measuring the actual color parameters (R/G and B/G ratios) of the photosensitive element under the specific OLED screen, comparing them with standard values, and using the deviation information to calculate and apply compensation values. This closed-loop feedback mechanism enables the system to adapt to individual screen characteristics and achieve consistent white balance across different devices
2Manufacturing precision
If individual OLED screens are used, then the display quality is improved, but the transmittance rate variation increases, leading to worse white balance consistency
Solution Approach 1:
The patent compensates for OLED screen variations by dynamically adjusting the white balance imaging parameters of the photosensitive element. The driver IC calculates compensation based on the ratio of actual to standard color parameters (R/G and B/G), then applies these compensation values to correct the imaging output, ensuring consistent white balance despite differences in individual OLED screen transmittance rates
Solution Approach 2:
The system uses feedback by measuring the actual color parameters of the photosensitive element under the specific OLED screen, comparing them with predetermined standard values, and using the measured deviations to calculate compensation values. This feedback loop enables the system to adapt to each OLED screen's unique characteristics and maintain reliable white balance consistency
3Ease of manufacture
If photosensitive elements are assembled without compensation, then the manufacturing process is simplified, but the color parameter deviation increases
Solution Approach 1:
The patent enables self-service by allowing each photosensitive element to automatically compensate for its own color parameter deviations through the driver IC. The system measures the actual R/G and B/G ratios of each individual photosensitive element, calculates specific compensation values for that element, and applies the compensation autonomously, eliminating the need for complex manual calibration processes while achieving consistent color parameters
Solution Approach 2:
The patent adjusts the white balance imaging parameters (R/G and B/G ratios) of each photosensitive element based on measured deviations from standard values. The driver IC calculates compensation factors by comparing actual color parameters with standard parameters, then modifies the imaging parameters accordingly, achieving color consistency without complicating the manufacturing assembly process
Data Source
AI summary
A display device and a white balance adjusting method of a photosensitive element of the display device are provided. The display device includes a display panel, the photosensitive element, and a driver integrated circuit (IC). A first white balance imaging parameter is color parameters of a preset image collected by the photosensitive element of the display device under a preset light source. A second white balance imaging parameter is color parameters of a preset image collected by a photosensitive element of a typical display device under the preset light source. The driver IC is configured to perform a white balance compensation on image data collected by the photosensitive element of the display device according to a deviation between the first white balance imaging parameter the second white balance imaging parameter.