Display Panel Light-Transmitting Area Infrared Sensor Integration
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Solution Overview
Problem
Current driver monitor systems (DMSs) using active infrared sensors to collect data within the 940±10 nm waveband face reduced infrared light intensity when passing through cover glass and display panels, leading to decreased recognition efficiency and potential failure in imaging.
Innovation Solution
A display panel design with a light-transmitting area adjacent to the display area, featuring a liquid crystal layer, planarization layer, passivation layer, and electrode layer configuration that increases infrared light transmittance by strategically positioning these layers to minimize interference and maximize infrared light passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If infrared sensors are integrated into the display panel using conventional layer structures, then the sensors can be hidden and privacy protected, but infrared light intensity is decreased when passing through the display panel
Solution Approach 1:
The display panel is divided into a display area and a light-transmitting area. The light-transmitting area is further segmented into a first light-transmitting area (adjacent to the display area) and a second light-transmitting area (opposite to the first light-transmitting area). This segmentation allows infrared light to pass through dedicated regions without being blocked by display structures, thereby maintaining infrared light intensity while integrating the sensor system within the display panel.
Solution Approach 2:
The patent positions the infrared sensor in a different spatial dimension relative to the display layers. The sensor is disposed on the first base, with its sensing surface facing the second light-transmitting area, creating a through-panel light path that bypasses the interfering layers (planarization, passivation, and electrode layers) by utilizing the depth dimension of the display structure.
2Ease of manufacture
If the electrode layer is positioned within the light-transmitting area, then electrical connections are maintained, but infrared light transmittance is reduced
Solution Approach 1:
The electrode layer is extracted from the light-transmitting area and repositioned solely within the display area. Specifically, the electrode layer is disposed on the first base with its sensing surface facing the second light-transmitting area, but its projection does not overlap with the first light-transmitting area. This extraction eliminates the blocking effect of the electrode layer on infrared light while maintaining electrical connectivity through alternative routing within the display area.
3Adaptability or versatility
If multiple functional layers are stacked to integrate sensors into the display panel, then device integration is improved, but infrared light interference increases
Solution Approach 1:
Different regions of the display panel are assigned different functional qualities. The display area contains all standard display layers (including planarization layer, passivation layer, and electrode layer) for normal display operation. The light-transmitting areas are designed with reduced layer structures or optimized material properties to be transparent to infrared light. This local differentiation allows the panel to maintain high integration in the display area while preserving infrared transmittance in the sensor areas.
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
Enhanced infrared light transmittance improves the imaging effect and recognition efficiency of infrared sensors, ensuring effective monitoring without compromising privacy or visibility.
Implementation Method 1
a liquid crystal layer disposed between the first base and the second base
Implementation Method 2
an optical coating layer disposed on a side of the first base away from the second base, and a refractive index of the optical coating layer ranges from 1 to 1.5
Data Source
AI summary
A display panel, a display device, and a vehicle monitoring device are provided. The display panel includes a display area and a light-transmitting area adjacent to the display area. The display panel includes a first base and a second base opposite to each other and a liquid crystal layer disposed between the first base and the second base. The display panel includes a planarization layer, a passivation layer, and an electrode layer disposed on a side of the first base close to the second base. Further, an orthographic projection of the electrode layer on the first base is outside the light-transmitting area.