Transparent Display Pixel Shielding for Rear Light Leakage
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Solution Overview
Problem
Existing transparent display devices using LED elements with areas of 10,000 μm2 or less struggle to sufficiently suppress light leakage from the rear-face side, affecting visibility and image recognition.
Innovation Solution
A transparent display device configuration featuring a semiconductor LED element with an area of 10,000 μm2 or less, where the rear-face side is covered by a light-shielding film, and internal transmittance of visible light is 90% or less, along with a protective layer and antireflective film to minimize light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light-shielding member is used for through-hole packaged LED, then light leakage to the rear-face side is suppressed, but it is insufficient for LED elements with area of 10,000 μm2 or less
Solution Approach 1:
The patent transitions from a planar light-shielding member to a three-dimensional reflective plate structure with specific angular orientations. The reflective plate is positioned at a 45-degree angle to redirect light from the rear-face side toward the front-face side, utilizing spatial dimensionality to solve the light leakage problem that cannot be adequately addressed by conventional planar shielding methods.
Solution Approach 2:
The reflective plate is designed with high reflectivity characteristics specifically for the wavelength range of light emitted by the LED element. This selective optical property ensures that light leakage in the relevant wavelength range is effectively redirected, while maintaining transparency in other wavelength ranges, thus addressing the light leakage issue without compromising overall display performance.
2Illumination intensity
If the rear-face side is made visually recognizable, then transparency is maintained, but light leakage from LED element occurs
Solution Approach 1:
The reflective plate serves as an intermediary element positioned between the LED element and the rear-face side. It intercepts light that would otherwise leak to the rear-face side and redirects it toward the front-face side, thereby maintaining rear-face visibility while preventing harmful light leakage. The plate acts as a mediating structure that reconciles the conflicting requirements of transparency and light leakage suppression.
Solution Approach 2:
By introducing a three-dimensional reflective plate structure with specific angular positioning, the patent redirects light paths in the spatial dimension. This allows the rear-face side to remain visually recognizable while light that would leak to the rear is reflected back toward the front, effectively separating the light transmission function from the visibility function.
3Manufacturing precision
If LED element area is reduced to 10,000 μm2 or less, then display resolution is improved, but light leakage suppression becomes insufficient
Solution Approach 1:
The reflective plate is positioned specifically adjacent to the LED element, providing localized light redirection exactly where needed. This localised approach allows the use of small-area LED elements for high resolution while ensuring that light leakage from each individual element is suppressed by its corresponding reflective plate structure.
Solution Approach 2:
The three-dimensional reflective plate structure compensates for the reduced light output from smaller LED elements by efficiently redirecting leaked light in the spatial dimension. This allows miniaturized LED elements to maintain both their high resolution advantage and adequate light leakage suppression through enhanced optical path 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
Effectively suppresses light leakage to the rear-face side, enhancing visibility and image recognition while maintaining transparency and display capabilities.
Implementation Method 1
a main surface on the rear-face side in the light-emitting diode element is covered by a light-shielding film
Implementation Method 2
a transparent substrate; and a light-emitting diode element arranged for each pixel on the transparent substrate
Implementation Method 3
an antireflective film formed on the protective layer
Data Source
AI summary
A transparent display device according to an aspect of the present invention includes: a transparent substrate; and light-emitting diode elements arranged for each pixel on the transparent substrate, a rear-face side of the transparent display device being visually recognizable from a viewing side. The light-emitting diode elements are semiconductor chips with an area of 10,000 μm2 or less, and a main surface on the rear-face side in the light-emitting diode elements is covered by a light-shielding film.