Infrared-Reflective Coating for Display Luminance Stability
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Solution Overview
Problem
Electronic devices face challenges in maintaining uniform luminance and image quality outdoors due to external light, particularly sunlight, which causes leakage current and voltage drops across pixels, leading to decreased visibility and image quality.
Innovation Solution
Incorporating a transparent layer with a display panel and a biometric sensor, along with a coating that reflects external light in the infrared band and transmits visible light, and an anti-reflection member to prevent light reflection, ensuring uniform light reflectivity across the screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a display is used with reduced bezel region to provide larger screen, then screen area is improved, but outdoor visibility deteriorates due to light reflection and luminance decrease
Solution Approach 1:
An infrared-reflective coating is introduced as an intermediary layer between the visible light transmission path and the semiconductor elements. This coating selectively reflects infrared radiation (which causes photoelectric leakage) while allowing visible light to pass through, thereby protecting the display's luminance without compromising screen area or visible light transmission.
Solution Approach 2:
The solution changes the optical parameters of the display structure by adding a coating with specific spectral selectivity. The coating has high reflectivity in the infrared band (700-1400nm) and high transmittance in the visible band (380-700nm), effectively filtering harmful infrared radiation while maintaining visible light transmission for display functionality.
2Reliability
If semiconductor elements are exposed to sunlight, then photoelectric effect generates leakage current, but this causes voltage drop and luminance decrease
Solution Approach 1:
The infrared-reflective coating provides preliminary protection by reflecting harmful infrared radiation before it can reach the semiconductor elements. This preemptive action prevents the photoelectric effect from occurring in the first place, thereby eliminating leakage current generation and subsequent luminance decrease without affecting normal display operation.
3Manufacturing precision
If different regions of display have different light reflectivities, then leakage current varies across regions, but this causes non-uniform luminance distribution
Solution Approach 1:
The solution applies a uniform infrared-reflective coating across the entire display surface, ensuring that all regions have identical optical properties. This local uniformity in the coating's infrared reflectivity compensates for variations in underlying structure reflectivity, resulting in consistent leakage current characteristics and uniform luminance distribution across all display regions.
4Illumination intensity
If a coating is added to reflect infrared light, then outdoor visibility is improved, but device structure complexity increases
Solution Approach 1:
The infrared-reflective coating is implemented as a thin film deposited directly on the display surface, integrating the protective function into the existing display structure without adding significant bulk or complexity. This thin-film approach maintains the sleek design and simple structure while providing effective infrared radiation management.
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 enhances outdoor visibility by reducing luminance decrease and improving image quality by maintaining uniform light distribution and reducing the electrical influence of external light on the display.
Implementation Method 1
a coating configured to reflect external light in an infrared band, transmitted to the substrate layer, and to transmit light in the visible light band
Implementation Method 2
When sunlight enters the display, a photoelectric effect in which the semiconductor element absorbs light to generate photons occurs, which may cause leakage current from the semiconductor element
Data Source
AI summary
An electronic device according to one embodiment may include: a transparency layer; a pixel layer disposed under the transparency layer, and including pixels that emit light in a visible ray and for displaying a content through the transparency layer; a display panel disposed under the pixel layer, and including a substrate layer including switches operating the pixels; a bio-sensor disposed under the display panel, and enabling acquisition of biometric information by using reflected light obtained through reflection, by an external object, of light output through the pixels; and a coating reflecting external light in an infrared ray band transmitted to the substrate layer, and allowing transmission of the light in a visible ray band, wherein the coating is formed between the transparency layer and the display panel.