LED Pixel Reflector Structure for Normal Viewing Brightness
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Solution Overview
Problem
Light emitting diode (LED) display panels have a brightest viewing angle that is not at the normal viewing angle due to their light emission patterns and characteristics, leading to issues with abnormal LED detection, as the light emission patterns are consistent and brightest at angles other than 0°, making abnormal LED issues easily observable.
Innovation Solution
The use of a reflector structure with specific bank opening shapes, such as equilateral triangles, where the first and second reflective bank structures are mirror images of each other, adjusting the light emission directions to be similar to different viewing angles, thereby improving brightness at the normal viewing angle and masking abnormal LED issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If LEDs are used without packaging and reflector structures, then the device complexity is reduced, but the brightness at normal viewing angle (0°) deteriorates because the brightest viewing angle is not at 0°
Solution Approach 1:
A reflector structure is introduced as an intermediary component between the LED and the viewer. The reflector includes a reflective bank with a specific shape (e.g., triangle, trapezoid, or quadrilateral) that redirects light from the LED to improve brightness at the normal viewing angle (0°). The reflective surface acts as a mediator to control light distribution without requiring complex LED packaging.
2Manufacturing precision
If all LEDs have consistent light emission patterns, then the manufacturing precision is improved, but the reliability deteriorates because abnormal LEDs are easily observable
Solution Approach 1:
The reflector structure is designed with specific local geometric features (e.g., triangular, trapezoidal, or quadrilateral shapes with defined angles) that create variations in light emission patterns across different pixels. Each pixel's reflector is positioned and shaped to redirect light at specific angles, creating diverse emission characteristics that make abnormal LEDs less easily distinguishable from normal ones.
3Ease of operation
If the brightest viewing angle is not at 0°, then the ease of operation is improved for certain viewing applications, but the illumination intensity at normal viewing angle deteriorates
Solution Approach 1:
The reflector structure's geometric parameters (shape, size, orientation, and position) are optimized to control light redirection. By adjusting parameters such as the reflective bank's angle, height, and lateral dimensions, the system achieves improved brightness at 0° viewing angle while maintaining flexibility for other viewing angles. The reflector effectively modifies the light distribution pattern without constraining viewing flexibility.
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 solution enhances the brightness at the normal viewing angle and reduces the visibility of abnormal LED displays, ensuring consistent and improved performance across various viewing angles.
Implementation Method 1
a reflector structure having a first reflective bank structure and a second reflective bank structure... adjusting the light emission directions
Data Source
AI summary
A light emitting diode (LED) display panel includes a back plate and a pixel structure, which includes multiple pixels. Each pixel includes a reflector structure and two LEDs emitting light of a same color, all disposed on the back plate. The reflector structure of each pixel has a first reflective bank structure and a second reflective bank structure. The first reflective bank structure has a first bank opening. The second reflective bank structure has a second bank opening. The two LEDs are disposed within the first and second bank openings. The first bank opening has a first shape, and the second bank opening has a second shape, which is a mirror shape or a 180° symmetrical shape of the first shape. For each of the pixels, the first shape is a polygonal shape, and at least two corners of the first shape have an included angle less than 90°.