Under-Screen Camera Assembly With Liquid Crystal Diffraction Control
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Solution Overview
Problem
The stacking of layers in display screens causes diffraction and opacity issues, leading to distorted images due to diffracted light sources, especially when strong light sources are involved, covering valid display regions.
Innovation Solution
An under-screen camera assembly with a TFT driving circuit that deflects liquid crystals between polarizers to control diffraction patterns, using a plurality of liquid crystals with different deflection angles and an image fusion algorithm to eliminate diffraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the camera is disposed under the screen to achieve full-screen design, then the screen coverage is improved, but diffraction of light occurs due to stacking of various layers of materials, causing image distortion and covering valid display regions
Solution Approach 1:
The patent divides the liquid crystal layer into multiple independent liquid crystal units, each controlled by separate TFTs. By independently controlling the deflection angles of different liquid crystal segments, the system can manipulate diffraction patterns to eliminate harmful diffraction effects while maintaining full-screen coverage.
Solution Approach 2:
The patent changes the physical state and orientation parameters of liquid crystals by applying voltages through TFTs. By dynamically adjusting the deflection angles of liquid crystal molecules, the system modifies light propagation characteristics to eliminate diffraction caused by layer stacking.
2Manufacturing precision
If multiple layers of polarizers and liquid crystals are added to eliminate diffraction, then image quality is improved, but device complexity increases
Solution Approach 1:
The patent makes the liquid crystal layer serve multiple functions: it acts as both the display medium for the screen and the diffraction control element for the under-screen camera. By using the same liquid crystal layer for both purposes, the patent avoids adding separate components, thus improving image quality without proportionally increasing device complexity.
Solution Approach 2:
The liquid crystal layer self-regulates light transmission and diffraction patterns through electric field control via TFTs. The system uses its own structural elements (liquid crystals and TFTs) to eliminate diffraction effects without requiring additional external components, thereby managing complexity while improving image quality.
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 eliminates diffraction of far-field light sources, preventing image distortion and ensuring clear imaging through the use of a TFT driving circuit to control liquid crystal deflection.
Implementation Method 1
liquid crystals disposed between the first polarizer and the second polarizer; and a Thin Film Transistor (TFT) driving circuit disposed on the second polarizer and configured for driving the liquid crystals to deflect
Implementation Method 2
stacking of various layers of materials of the screen form refraction of the screen in the various layers and opacity of RGB (red, green, and blue) light-emitting points displayed on the screen, forming diffraction of a hole region or a barrier
Implementation Method 3
each of the liquid crystals is connected to the TFT driving circuit and has a different deflection angle
Data Source
AI summary
An under-screen camera assembly, a backlight module and a display apparatus. The under-screen camera assembly includes: an Organic Light Emitting Diode (OLED) screen, where the OLED screen is provided with an OLED high transmittance region; a first polarizer and a second polarizer both disposed on the OLED high transmittance region, where the second polarizer is stacked on the first polarizer; liquid crystals disposed between the first polarizer and the second polarizer; and a Thin Film Transistor (TFT) driving circuit disposed on the second polarizer and configured for driving the liquid crystals to deflect.