Backlight Reflecting Plate Layout for Under-Screen Camera Light Leakage
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Solution Overview
Problem
The use of LCD under-screen cameras in mobile terminals results in light leakage through the side walls of the through-hole in the backlight module, interfering with camera imaging and reducing the screen-to-body ratio due to the need for mechanical structures that increase weight.
Innovation Solution
A backlight structure with a light reflecting plate featuring a horizontal and bending portion, and a second backlight module with a light emitting surface, designed to reflect light rays away from the through-hole and block stray light, combined with an astigmatic gasket to scatter and attenuate light, ensuring uniform brightness and preventing black edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mechanical pop-up camera or rear-facing and turning camera is used to improve screen-to-body ratio, then the front-facing camera function is achieved, but additional mechanical structures increase the weight of the mobile terminal
Solution Approach 1:
The patent replaces mechanical camera structures (pop-up mechanisms, moving parts) with an optical solution using a light reflecting plate and backlight module configuration. The light reflecting plate redirects light paths to enable the camera to function through the display screen without any mechanical movement or additional mechanical components, thereby maintaining low weight while achieving the front-facing camera function.
2Adaptability or versatility
If a through-hole is disposed in the backlight module for under-screen camera to maintain high screen-to-body ratio, then mechanical structures are avoided, but light leakage occurs in the side wall of the through-hole causing interference with camera imaging
Solution Approach 1:
The patent converts the potentially harmful light leakage from the through-hole side walls into a beneficial effect by using a light reflecting plate. The reflecting plate is positioned to intercept stray light that would otherwise leak and interfere with the camera, and redirects this light toward the display area. This transforms the harmful stray light into useful illumination, eliminating the interference while maintaining the through-hole configuration for high screen-to-body ratio.
Solution Approach 2:
The light reflecting plate acts as an intermediary element between the through-hole and the camera sensor. It is positioned to intercept light rays that would otherwise leak through the side walls and directly reach the camera sensor causing interference. The reflecting plate redirects these light rays toward the display area, thereby mediating the interaction between the through-hole structure and the camera to eliminate harmful effects.
3Measurement precision
If light shielding material is used to shield the side wall of the through-hole to prevent light leakage, then camera imaging quality is improved, but the display area cannot be maintained without black edges
Solution Approach 1:
The light reflecting plate serves as an intermediary that redirects light paths to simultaneously satisfy both requirements. By positioning the reflecting plate at specific angles, it intercepts stray light from the through-hole side walls and redirects it toward the display area, preventing camera interference while ensuring uniform light distribution across the entire display area without creating black edges.
Solution Approach 2:
The patent optimizes the parameters of the light reflecting plate, including its position, orientation, and shape, to achieve the dual function of preventing light leakage and maintaining uniform display coverage. By carefully adjusting these parameters, the system eliminates the need for light shielding material that would create black edges, as the reflecting plate configuration itself ensures uniform light distribution across the full display area.
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 reduces light leakage and black edge issues, enhancing imaging quality and maintaining a high screen-to-body ratio without additional mechanical components.
Implementation Method 1
the bending portion is located in the third through-hole and configured to reflect a light ray incident into the second backlight module and passing through a side wall of the third through-hole to the light emitting surface
Data Source
AI summary
The present application provides a backlight structure and an electronic device. The backlight structure includes a first backlight module; a light reflecting plate including a horizontal portion and a bending portion connected with the horizontal portion, where the horizontal portion is provided with a first through-hole and the bending portion forms a second through-hole; and a second backlight module having a third through-hole and a light emitting surface, where the bending portion is located in the third through-hole and configured to reflect a light ray incident into the second backlight module and passing through a side wall of the third through-hole to the light emitting surface.