Under-Display Image Sensor Blue Pixel Sensitivity Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The integration of a digital camera module under a display panel in mobile devices leads to reduced light intensity on the image sensor due to light passing through the display panel, degrading image sensor performance, particularly in low-luminance environments.
Innovation Solution
An image sensor with a pixel array positioned under the display panel, a row driver, and a controller that selectively enhances the sensing sensitivity of blue pixels, which have the lowest transmission ratio through the display panel, by increasing their sensitivity relative to red and green pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the image sensor is disposed under the display panel to provide a wide display screen, then the display area is increased, but the light intensity incident on the image sensor is decreased
Solution Approach 1:
The patent applies local quality by differentiating the sensing sensitivity across different color pixels. Specifically, blue pixels are configured with higher sensing sensitivity compared to red and green pixels, as blue light has the lowest transmission ratio through the display panel. This localized adjustment compensates for the wavelength-dependent light attenuation without requiring apertures or physical modifications to the display structure.
2Device complexity
If the image sensor is disposed under the display panel, then the device integration is improved, but the image sensor performance is degraded
Solution Approach 1:
The patent employs parameter changes by adjusting the sensing sensitivity parameter of blue pixels to be higher than that of red and green pixels. This is achieved through controlling the pixel array and row driver to compensate for the reduced light transmission at blue wavelengths. The parameter adjustment maintains image quality and sensor performance despite the integrated under-display configuration.
3Measurement precision
If the sensing sensitivity of blue pixels is increased to compensate for low transmission ratio, then the image quality is maintained, but the device complexity increases
Solution Approach 1:
The controller and row driver are designed to perform multiple functions: they drive the pixel array for normal operation and simultaneously implement the differential sensitivity control for blue pixels. This multi-functionality allows the system to maintain image quality across all color channels without requiring separate dedicated circuits for each color, thereby limiting the increase in device complexity.
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 configuration enhances image quality and performance by efficiently increasing the sensing sensitivity of blue pixels, addressing the light transmission issues and maintaining image quality across the display panel without the need for apertures, thus enabling better image capture in low-luminance conditions.
Implementation Method 1
a pixel array disposed under a display panel, the pixel array including a plurality of pixels configured to perform a sensing operation by collecting a photo-charge generated by a light that penetrates the display panel
Data Source
AI summary
An image sensor including: a pixel array disposed under a display panel, the pixel array including a plurality of pixels configured to perform a sensing operation by collecting a photo-charge generated by a light that penetrates the display panel; a row driver configured to drive the plurality of pixels row by row; and a controller configured to control the pixel array and the row driver such that a sensing sensitivity of blue pixels among the plurality of pixels is higher than a sensing sensitivity of red pixels and a sensing sensitivity of green pixels among the plurality of pixels.