TOF Display Panel Interference Layer Against Newton Rings
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Solution Overview
Problem
The imaging accuracy of a display device with a Time Of Flight (TOF) ranging structure is adversely affected by the occurrence of Newton rings due to the formation of coherent light from an air gap layer between the lens and the display panel, leading to destructive and constructive interference.
Innovation Solution
A light reflection interference layer is arranged on the display panel to adjust the transmission direction of reflected light, using materials like MgF2 or SiO2, with specific refractive indices and thicknesses to prevent coherent light interference, thereby eliminating or reducing Newton rings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a TOF sensor with lens is arranged near the display panel, then long detection distance and simple structure are achieved, but Newton rings occur due to coherent light interference from the air gap layer
Solution Approach 1:
A light reflection interference layer is introduced as an intermediary between the display panel and the TOF sensor lens. This layer adjusts the transmission direction of reflected light to prevent coherent light interference, thereby eliminating Newton rings while maintaining the compact TOF structure.
Solution Approach 2:
The refractive index and thickness of the light reflection interference layer are specifically optimized to control light transmission. By changing these parameters, the layer effectively adjusts the optical path of reflected light to prevent interference patterns.
2Measurement precision
If a light reflection interference layer is added to prevent Newton rings, then TOF imaging accuracy is improved, but device structure becomes more complex
Solution Approach 1:
The light reflection interference layer is implemented as a thin film structure that can be integrated into the existing display panel construction. This thin film approach adds minimal structural complexity while effectively addressing the Newton ring interference problem.
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 prevents the occurrence of Newton rings, ensuring accurate TOF imaging by maintaining the reflectivity of light within a preset range, thus enhancing the imaging accuracy of the display device.
Implementation Method 1
A light reflection interference layer is arranged on a surface of the target light-transmitting region facing the TOF sensor, and configured to adjust a transmission direction of reflected light between the display panel and a lens of the TOF sensor
Implementation Method 2
after light from the light transmitter is reflected and refracted by the lens and the display panel, the reflected light at both sides of the air gap layer forms coherent light
Implementation Method 3
after light from the light transmitter is reflected and refracted by the lens and the display panel
Implementation Method 4
the light reflection interference layer is configured to scatter the reflected light
Data Source
AI summary
The present disclosure provides a display device and a manufacturing method thereof. The display device includes a display panel and a TOF sensor arranged at a side of the display panel away from a display surface. Detection light received by the TOF sensor is allowed to pass through a target light-transmitting region of the display panel. A light reflection interference layer is arranged on a surface of the target light-transmitting region facing the TOF sensor, and configured to adjust a transmission direction of reflected light between the display panel and a lens of the TOF sensor.