Micro LED Display Substrate Hole Light Leakage Prevention
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Solution Overview
Problem
Display devices with micro light emitting diodes (micro LEDs) face light leakage issues through holes in the substrate, which affect display quality and efficiency.
Innovation Solution
The use of smaller light emitting elements with lower luminance around the holes in the substrate, and specific light emitting element configurations such as high-resistance layers and varying gate line lengths, to minimize light leakage into the holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If light emitting elements are disposed around the hole in the substrate, then the display area is increased, but light leakage into the hole occurs
Solution Approach 1:
The patent applies local quality by differentiating the chip sizes of light emitting elements based on their position relative to the hole. Elements closer to the hole use smaller chip sizes to reduce light emission intensity and prevent leakage, while elements farther away can use larger chip sizes for optimal display performance. This spatially varying design resolves the contradiction between maximizing display area and preventing light leakage.
2Object-generated harmful factors
If smaller light emitting elements are used around the hole, then light leakage is reduced, but the luminance is lowered
Solution Approach 1:
The patent implements local quality by assigning different chip sizes to light emitting elements based on their location. Smaller chip sizes are used near the hole to reduce light leakage, while larger chip sizes are used in regions farther from the hole to maintain high luminance. This creates a gradient distribution that locally optimizes both light leakage prevention and luminance output.
Solution Approach 2:
The patent introduces a high-resistance layer as an intermediary component between the light emitting elements and the substrate. This layer acts as a mediator that blocks and absorbs stray light from smaller chip elements, preventing it from leaking into the hole while allowing the elements to maintain their reduced size. The high-resistance layer thus enables the use of smaller elements without fully compromising luminance.
3Object-generated harmful factors
If high-resistance layer is added to light emitting element structure, then light leakage is prevented, but device complexity increases
Solution Approach 1:
The patent merges the high-resistance layer with the existing light emitting element structure, integrating it as part of the element's layered construction. Rather than adding a separate component, the high-resistance layer is incorporated into the element's fabrication process and structure, combining multiple functions (light emission and light blocking) into a single integrated unit. This reduces overall device complexity while maintaining light leakage prevention.
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
Prevents light leakage into the holes, maintaining high display quality and efficiency by optimizing light emission and extraction.
Implementation Method 1
the high-resistance layer has an opening at a center, and the cathode electrode covers the high-resistance layer and is directly coupled to a center part of the n-type cladding layer through the opening of the high-resistance layer
Implementation Method 2
a plurality of light emitting elements provided to the respective pixels. The light emitting elements includes a first light emitting element having a predetermined chip size, and a second light emitting element having a chip size smaller than the chip size of the first light emitting element
Data Source
AI summary
A display device includes a substrate having a hole, a plurality of pixels provided to the substrate, and a plurality of light emitting elements provided to the respective pixels. the light emitting elements include a first light emitting element having a predetermined chip size, and a second light emitting element having a chip size smaller than the chip size of the first light emitting element, the first light emitting element and the second light emitting element emit light in a common color, and the light emitting elements disposed around the hole include at least one second light emitting element.