OLED Display Monochrome Filtering for Under-Display Camera Color Distortion
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Solution Overview
Problem
The transmittance of film layers in display panels varies by wavelength, particularly for short-wavelength blue light, leading to color distortion during camera imaging due to reduced light signals, affecting the imaging effect and user experience.
Innovation Solution
Incorporating a monochrome filter structure with color resists of the same color in the camera module, which filters and collects more light signals of the same color, allowing for signal integration across modules to compensate for missing wavelengths, thereby alleviating color distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the camera module is placed under the display light-transmitting area to achieve ultra-high screen-to-body ratio, then the screen ratio is improved, but color distortion occurs due to wavelength-dependent transmittance of the display panel
Solution Approach 1:
The patent applies color resists with specific wavelength transmission characteristics to compensate for the display panel's wavelength-dependent transmittance. By selecting color resists that transmit complementary wavelengths, the system balances the spectral composition of light reaching the camera sensor, thereby reducing color distortion while maintaining the ultra-high screen-to-body ratio design
Solution Approach 2:
The patent employs a composite optical structure combining the display panel, color resist layers, and camera module in an integrated arrangement. This composite structure allows the different components to work together synergistically, where the color resist layer compensates for the display panel's spectral filtering effect, enabling both high screen ratio and acceptable color accuracy
2Ease of manufacture
If the display panel film layer transmits short-wavelength blue light with low transmittance, then the display function is maintained, but the camera imaging quality deteriorates due to insufficient light signals
Solution Approach 1:
The patent modifies the optical parameters of the system by introducing color resists with specific transmission characteristics. These color resists are designed to transmit wavelengths that are blocked or attenuated by the display panel, thereby changing the spectral distribution of light reaching the camera sensor and improving imaging quality without compromising display performance
3Quantity of substance
If a monochrome filter structure with color resists of the same color is added to the camera module, then the collection of monochromatic light signals is improved, but the device complexity increases
Solution Approach 1:
The color resist layer serves multiple functions simultaneously: it acts as a spectral filter to enhance monochromatic light transmission, serves as part of the optical path integration structure, and maintains compatibility with the existing display and camera module designs. This multi-functionality reduces the need for additional separate components, 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
The solution effectively enhances imaging quality by increasing the collection of monochromatic light signals, improving the imaging effect and user experience by reducing color distortion.
Implementation Method 1
The light filtering structure includes at least one color resist... The light filtering structure includes a monochrome filter structure. The color resists in the monochrome filter structure have the same color
Data Source
AI summary
Display module includes a display panel, the display panel including at least one light-transmitting display area; at least one camera module, the at least one camera module being located on a side away from a light-emitting surface of the display panel, the camera module being arranged to correspond to the at least one light-transmitting display area; at least one of the at least one camera module including a photosensitive element and a light filtering structure, the light filtering structure being located on a side of the photosensitive element facing the display panel, the light filtering structure including at least one color resist, along a direction perpendicular to a plane where the camera module is located, the color resist at least partially overlapping with the photosensitive element, the light filtering structure including a monochrome filter structure, the at least one camera module including the monochrome filter structure.