Embedded Optical Sensor Flat Panel Display
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Solution Overview
Problem
Conventional optical fingerprint sensors face limitations in increasing scanning area and integration with display devices, leading to complex assembly structures, increased size, and thickness, as well as degradation of fingerprint recognition functionality when using protection films on handheld displays.
Innovation Solution
A flat panel display with an embedded optical image sensor utilizing a directional light unit comprising a cover substrate, low refractive index layers, and holographic light-exiting and light-entering elements to provide collimated detection light over a large area, eliminating interference and maintaining thinness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional optical scanning equipment is used to increase scanning area, then the scanning area is improved, but the device complexity and size increase
Solution Approach 1:
The patent merges the optical scanning function with the display panel by integrating the optical image sensor directly into the display structure. The display panel serves dual purposes: displaying images and functioning as the scanning area for fingerprint recognition, thereby eliminating the need for separate scanning equipment and reducing overall device complexity.
Solution Approach 2:
The display panel is designed to perform multiple functions simultaneously: it acts as both the display surface and the scanning area for the optical image sensor. This multi-functionality allows the same component to serve dual purposes, reducing the number of separate components needed and simplifying the overall assembly structure.
2Reliability
If conventional capacitive fingerprint sensor with push button is used, then fingerprint sensing is achieved, but the thickness increases
Solution Approach 1:
The patent extracts the fingerprint sensing function from the traditional push button structure and integrates it directly into the display panel. By removing the separate push button component and embedding the optical image sensor within the display layers, the thickness is significantly reduced while maintaining fingerprint sensing capability.
Solution Approach 2:
The optical image sensor is nested within the display panel structure, with the sensor positioned between the display layers. This nesting approach allows the fingerprint sensing function to be embedded within the existing display thickness, avoiding additional thickness from separate components.
3Area of stationary object
If protection film is attached to display area for fingerprint recognition, then fingerprint recognition area is improved, but the fingerprint recognition functionality degrades
Solution Approach 1:
The patent removes the need for a separate protection film by integrating the optical image sensor directly into the display panel structure. The sensor is positioned within the display layers, allowing fingerprint recognition to occur through the display surface itself without requiring an additional protection film that would degrade functionality.
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
Enables high-resolution, large-area fingerprint recognition without increasing the thickness of the display device, by using an ultrathin film structure that spreads collimated infrared laser light over the display area, effectively integrating with existing flat panel displays.
Implementation Method 1
a first low refractive index layer attached to the lower surface of the cover substrate; a light-exiting element disposed to correspond to the display area, on the lower surface of the first low refractive index layer
Implementation Method 2
provides directional light as detection light over a large area... by guiding directional light within some layers in a cover glass
Data Source
AI summary
The present disclosure relates to a flat panel display with an optical image sensor embedded therein. The flat panel display includes a directional light unit. The directional light unit comprises a cover substrate with a surface area corresponding to the length and width; a first low refractive index layer attached to the lower surface of the cover substrate; a light-exiting element disposed to correspond to the display area, on the lower surface of the first low refractive index layer; a light-entering element disposed outside the display area at one side of the light-exiting element, on the lower surface of the first low refractive index layer; a second low refractive index layer disposed on the lower surfaces of the light-exiting element and light-entering element and attached to the upper surface of the display panel; and a light source disposed to face the light-entering element.