LCD Display Module Layout for Under-Screen Texture Recognition
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in integrating under-screen fingerprint recognition technology without compromising the screen-to-body ratio and interfering with display functionality.
Innovation Solution
A display module is designed with a first light source emitting invisible light, a texture recognition unit, and a liquid crystal module structure that allows for under-screen texture recognition, minimizing interference and maximizing the screen-to-body ratio by positioning light sources to avoid overlap and using polarizing layers to filter visible and invisible light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a light source is added for fingerprint recognition, then texture recognition function is improved, but device complexity increases
Solution Approach 1:
The display module integrates multiple functions into a single device structure. The light source serves dual purposes: illuminating the display screen during normal operation and enabling fingerprint recognition when activated. The sensing module similarly functions for both display control and biometric authentication, eliminating the need for separate fingerprint sensing hardware and reducing overall device complexity.
Solution Approach 2:
The patent combines the fingerprint sensing module with the display module structure. The light source is integrated into the display backlight system, and the sensing module shares the same optical path and structural framework as the display, merging what would traditionally be separate components into a unified system.
2Measurement precision
If light sources are positioned for fingerprint recognition, then texture recognition accuracy is improved, but screen-to-body ratio decreases
Solution Approach 1:
The light source is positioned at the edge of the display module rather than in the center or overlapping with the screen area. This edge positioning utilizes the peripheral dimension of the display structure, allowing the light to illuminate the fingerprint sensing area without occupying screen real estate, thereby maintaining the screen-to-body ratio while achieving accurate texture recognition.
Solution Approach 2:
The light source is strategically positioned at specific locations (edges or corners) of the display module where it can effectively illuminate the fingerprint sensing area without interfering with the display screen. This localized positioning optimizes the light path for fingerprint recognition while preserving the maximum screen area.
3Object-affected harmful factors
If polarizing layers are added to filter light, then light interference is reduced, but device complexity increases
Solution Approach 1:
The polarizing layers are integrated into the existing display module structure, serving dual functions: controlling the polarization of display light for normal screen operation and filtering the light path for fingerprint sensing. This multi-functional integration reduces light interference without requiring separate filtering components, thereby minimizing 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 enables accurate texture recognition, such as fingerprint scanning, while maintaining a high screen-to-body ratio by optimizing light paths and reducing interference, thus enhancing the functionality and aesthetics of liquid crystal display devices.
Implementation Method 1
a first light source 41, located at a side of the cover plate 10 proximate to the liquid crystal module 20, and configured to emit invisible light
Implementation Method 2
using polarizing layers to filter visible and invisible light
Data Source
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AI summary
A display module and a display device. The display module includes: a liquid crystal module, a cover plate, and a texture recognition unit. The texture recognition unit includes a first light source and a texture sensing module. The first light source is located at a side of the cover plate proximate to the liquid crystal module, and is configured to emit invisible light. The texture sensing module is located at a side of the liquid crystal module facing away from the cover plate. A light wavelength range of light allowed to pass through the cover plate and the liquid crystal module includes a light wavelength range of the invisible light. The texture sensing module is configured to collect reflected light after the invisible light is irradiated to a target object, so as to identify a texture of the target object.