Under-screen Camera Display with Optical Fingerprint Sensor
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Solution Overview
Problem
In display devices, the camera area cannot be displayed due to the presence of a camera, and the low transmittance of liquid crystal screens makes it difficult to design optical paths for optical fingerprint identification and arrange sensors in the display area.
Innovation Solution
A display device is divided into a camera placement area and a non-camera placement area, featuring a backlight module with a through hole for the camera area, a display module with fingerprint sensors between micro-LED units, and a light blocking layer to prevent overlap and enhance optical fingerprint unlocking functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a camera is placed in the display area to achieve camera functionality, then the camera can be integrated into the display, but the camera area cannot display and creates a non-display region
Solution Approach 1:
The display area is segmented into a first display area (non-camera region) and a second display area (camera region). The first display area contains liquid crystal display components for normal display, while the second display area contains transparent display components and camera components, allowing both camera functionality and display coverage across the entire screen area
Solution Approach 2:
The second display area is designed to serve multiple functions: it acts as a display area using transparent display technology, houses the camera components for photography functions, and maintains optical transparency for fingerprint sensing. This multi-functional design eliminates the need for separate dedicated areas for each function
2Ease of manufacture
If liquid crystal display components are used to achieve display functionality, then the display can be implemented, but the low transmittance makes it difficult to design optical paths for optical fingerprint identification
Solution Approach 1:
Different display technologies are applied to different regions: the first display area uses conventional liquid crystal display components with higher transmittance characteristics, while the second display area uses transparent display components with even higher transmittance to accommodate both display and optical fingerprint sensing functions simultaneously
3Reliability
If sensors are arranged in the display area to achieve optical fingerprint identification, then fingerprint sensing is enabled, but the sensor placement conflicts with display components due to limited space
Solution Approach 1:
The fingerprint sensors are arranged in a specific pattern within the second display area, utilizing the spatial dimension efficiently. The sensors are positioned to work with the transparent display components above and the light source below, creating a three-dimensional optical path that enables fingerprint sensing without blocking the 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
This configuration allows for full-screen display, under-screen optical fingerprint unlocking, and camera functionality, improving design simplicity and accuracy while avoiding interference with the main screen display.
Implementation Method 1
a micro-light emitting diode (LED) module disposed on a side of the color filter substrate facing away from the array substrate and corresponding to the camera placement area of the display device
Implementation Method 2
a liquid crystal layer disposed between the array substrate and the color filter substrate and corresponding to the non-camera placement area of the display device
Implementation Method 3
a lower polarizer disposed on a side of the array substrate adjacent to the backlight module and corresponding to the non-camera placement area of the display device, and a built-in upper polarizer disposed on a side of the color filter substrate adjacent to the liquid crystal layer
Data Source
AI summary
The present disclosure provides a display device, which is divided into a camera placement area and a non-camera placement area, including a backlight module, a display module, and a camera. The display module includes an array substrate and a color filter substrate opposite to the array substrate. The array substrate and the color filter substrate together form a cell. Wherein, the display module provides fingerprint sensors corresponding to the camera placement area of the display device.