Display Device with Perpendicular Grating Structures
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Solution Overview
Problem
Current display technologies, such as LCDs, face limitations in signal-to-noise ratios and viewing angles due to excessive collimation, which reduces the effectiveness of fingerprint sensing and overall display performance.
Innovation Solution
A display device incorporating a backlight module with a reverse prism structure and a display module featuring embedded sensors with diffraction gratings made of inorganic materials, where the grating direction of the diffraction gratings is perpendicular to the reverse prism structure, enhancing signal-to-noise ratios and maintaining wider viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If collimation backlight is used to improve signal-to-noise ratio in fingerprint sensing, then sensing accuracy is improved, but display viewing angle is reduced
Solution Approach 1:
The patent introduces a second grating structure with grating lines extending in the y-direction (perpendicular to the x-direction grating lines of the first grating). This dimensional addition transforms the light control from one-dimensional collimation to two-dimensional angular control, simultaneously achieving narrow angular distribution for sensing and wide viewing angles for display.
Solution Approach 2:
The patent combines two grating structures with perpendicular grating line directions into a single integrated light control layer. This composite structure integrates the collimation function (first grating) with the viewing angle expansion function (second grating), creating a unified optical element that resolves the contradiction between sensing accuracy and display performance.
2Object-affected harmful factors
If excessive collimation is applied to improve fingerprint sensing signal quality, then noise is reduced, but light distribution becomes too concentrated limiting viewing angles
Solution Approach 1:
By adding the second grating with y-direction lines perpendicular to the first grating's x-direction lines, the patent expands light control into a second dimension. This allows the system to filter noise signals effectively while distributing light across wider viewing angles, preventing the light concentration problem caused by excessive single-direction collimation.
Solution Approach 2:
The patent applies different grating orientations to control light in different directions: the first grating (x-direction) provides strong collimation for sensing signal quality, while the second grating (y-direction) modulates the angular distribution to enable wide viewing angles. Each grating structure contributes a specific local optical function to resolve the contradiction.
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 improves signal-to-noise ratios and maintains wider viewing angles, resulting in enhanced display accuracy and effectiveness for fingerprint sensing and other applications.
Implementation Method 1
a reverse prism structure is disposed on top of the backlight module
Implementation Method 2
a plurality of diffraction gratings are disposed on surfaces of the plurality of sensors
Data Source
AI summary
A display device is provided. The display device includes a backlight module with a reverse prism structure disposed on top, and a display module disposed above the backlight module. The display module includes a display panel and a sensor component. The sensor component is embedded in the display panel. The sensor component includes a plurality of sensors. A plurality of diffraction gratings are disposed on surfaces of the plurality of sensors. A grating direction of the plurality of diffraction gratings is perpendicular to a grating direction of the reverse prism structure.