Light Diffusion Part and Black Layer for LED Orientation
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Solution Overview
Problem
As LEDs miniaturize, it becomes challenging to provide a structure for achieving desired orientation characteristics, leading to issues like black floating in light emitting diode display apparatuses, where the LED package appears dark and occupies a smaller display region, making black floating more noticeable.
Innovation Solution
A light emitting device configuration that includes a light reflection film to reflect and pass light through openings, preventing light from penetrating into the first interlayer film and using a black layer with a gap between the light emitting part and the black layer to prevent black floating, while improving orientation characteristics by using a light diffusion part and interlayer films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a structure for giving orientation characteristics is provided on the LED package, then orientation characteristics are improved, but the LED package size increases making miniaturization difficult
Solution Approach 1:
The orientation control function is segmented from the LED package itself and transferred to a separate orientation control layer. This layer is divided into multiple regions with different light transmission characteristics (transparent regions and light-shielding regions) that work together to achieve the desired radiation distribution without increasing the LED package volume.
Solution Approach 2:
The solution moves the orientation control mechanism from the three-dimensional LED package structure to a two-dimensional planar layer positioned above the LEDs. This dimensional shift allows orientation characteristics to be controlled through pattern design in the XY plane without adding vertical height to the LED package.
2Illumination intensity
If the LED package is blackened to improve image quality, then viewing angle dependence is reduced, but black floating becomes obvious as LED size decreases
Solution Approach 1:
The orientation control layer implements local quality by creating spatially varying regions with different optical properties. Transparent regions allow light passage while light-shielding regions block light, and this local differentiation achieves both the desired radiation distribution and eliminates the need for complete blackening of the LED package, thereby preventing black floating.
3Area of stationary object
If the LED is miniaturized to increase display resolution, then display density improves, but providing orientation control structure becomes more difficult
Solution Approach 1:
The orientation control function is merged with the existing display structure by integrating the orientation control layer into the overall display assembly. This layer can be manufactured using standard thin-film fabrication techniques and positioned above the LED array, combining multiple functions (light emission, orientation control, and display) without adding significant complexity to the miniaturized LED structure.
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 the orientation characteristics of light emitted from the light emitting device, preventing black floating and allowing for easier miniaturization of the light emitting device and its arrangement pitch, thereby improving image quality.
Implementation Method 1
a light diffusion part (41) formed on or above the black layer (51)... light emitted from the light emitting part passes through the light diffusion part
Implementation Method 2
a light reflection film that reflects a portion of light emitted from the light emitting part and allows the light to pass through the opening part
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
A light emitting device includes a light emitting part 21, a black layer 51, and a light diffusion part 41 that is formed on or above the black layer 51. The black layer 51 is provided with an opening part 53 that allows light emitted from the light emitting part to pass through it. Then, light having passed through the opening part 53 passes through the light diffusion part 41.