Micro LED Display Structure for Internal Reflection Suppression
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Solution Overview
Problem
Micro LED displays face issues with internal light reflection from upper and side surfaces, leading to reduced contrast, particularly in the display of black colors, due to the use of highly reflective metal materials in transistors and IC chips, which can reflect light and decrease brightness.
Innovation Solution
A display device configuration featuring a first substrate with a light-emitting element, a second substrate, a first structure surrounding the light-emitting element on the second substrate, and a light-shielding film with a supplementary angle of the side surface inclination between 30 degrees and 90 degrees, which helps to suppress light reflection and enhance contrast by directing light emission effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light-shielding layer is used to improve front brightness, then front brightness is improved, but internal reflection of light from the light-emitting element is not suppressed and contrast decreases
Solution Approach 1:
The patent introduces a light-shielding film positioned at the side surface of the light-emitting element, adding a spatial dimension (side surface coverage) to the conventional top-only light shielding approach. This dimensional extension enables the film to intercept light paths that would otherwise cause internal reflection, thereby suppressing glare while preserving front brightness.
Solution Approach 2:
The light-shielding film is selectively applied only to the side surface of the light-emitting element rather than covering the entire display area. This localized application targets specifically the regions where internal reflection occurs, maintaining light transmission in other areas and preserving overall brightness while eliminating harmful reflections.
2Reliability
If highly reflective metal material is used in transistor and IC chip, then electrical performance is improved, but light reflection occurs and contrast decreases
Solution Approach 1:
The light-shielding film acts as an intermediary layer between the light-emitting element and the highly reflective metal materials in transistors and IC chips. This intermediate structure prevents direct optical interaction between the light and metal surfaces, blocking reflection paths while allowing the metal materials to maintain their electrical functions unchanged.
3Object-generated harmful factors
If light-shielding film is added to suppress reflection, then contrast is improved, but device complexity increases
Solution Approach 1:
The patent extracts the light-shielding function from the bulk light-shielding layer and implements it separately as a thin film on the side surface. This extraction allows the main light-shielding layer to maintain its brightness-improving function while the added film provides reflection suppression, achieving dual functionality without significantly increasing overall device complexity.
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
The described configuration improves front brightness and contrast in micro LED displays by effectively managing light emission and reflection, preventing light leakage and external light entry, thereby enhancing the display's overall performance.
Implementation Method 1
a light-shielding film overlapping the first structure between the first substrate and the second substrate
Implementation Method 2
a first structure surrounding a light-emitting element on a surface of the second substrate... a supplementary angle of an inclination angle of a side surface of the first structure is 30 degrees or more and less than 90 degrees
Data Source
AI summary
A display device includes a first substrate, a light-emitting element on the first substrate, a second substrate opposed to the first substrate, a first protruding structure surrounding the light-emitting element on a surface of the second substrate opposed to the first substrate, and a light-shielding film overlapping the first protruding structure between the first substrate and the second substrate, wherein a supplementary angle of an inclination angle of a side surface of the first protruding structure is 30 degrees or more and 90 degrees or less. In addition, the display device further includes a reflective film on the side surface of the first protruding structure. Furthermore, the light-shielding film is located between the first protruding structure and the second substrate. Besides, a surface of the first protruding structure on a side of the second substrate is smaller than the light-shielding film.