Display Pixel Electrode Layout for LED Alignment and Luminance
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Solution Overview
Problem
Current display devices face challenges in achieving optimal lighting efficiency, particularly in the arrangement and connection of light emitting elements within the emission area, which affects the overall performance and luminance of pixels.
Innovation Solution
The display device incorporates a specific arrangement of light emitting elements with varying polarities and connection electrodes, including a first and second light emitting element with p-type and n-type semiconductor ends, respectively, and a connection electrode structure that ensures proper electrical contact and alignment, enhancing lighting efficiency through the use of insulating layers and alignment electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If light emitting elements are arranged with proper spacing and connection electrodes are configured for electrical contact, then lighting efficiency of pixels is improved, but device complexity increases due to multiple connection electrodes and insulating layers
Solution Approach 1:
The connection structure is segmented into multiple functional components: first connection electrode for p-type contact, second connection electrode for n-type contact, third connection electrode for additional p-type contact, and fourth connection electrode for additional n-type contact. Each electrode is independently configured to contact specific polarity ends of light emitting elements, allowing optimized electrical connections without requiring a single complex connection structure.
Solution Approach 2:
An insulating layer is introduced as an intermediary component between the connection electrodes and the light emitting elements. This insulating layer with contact holes enables precise electrical contact while providing electrical isolation where needed, facilitating the complex connection pattern without causing short circuits or interference between adjacent electrodes.
2Reliability
If multiple connection electrodes are used to contact both ends of light emitting elements, then electrical contact reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The insulating layer is formed beforehand with predetermined contact hole positions, establishing a template for subsequent electrode deposition. This preliminary structuring ensures that connection electrodes are deposited in correct alignment with the contact holes, reducing the need for high-precision alignment during electrode formation and improving manufacturing yield.
Solution Approach 2:
The connection structure utilizes vertical layering (third dimension) by stacking insulating layers and electrodes at different heights. Contact holes penetrate through the insulating layer vertically, allowing electrical contact to be established in the vertical dimension rather than relying solely on horizontal planar alignment, thereby reducing lateral precision requirements.
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 improves the lighting efficiency of pixels by ensuring effective electrical contact and alignment, leading to enhanced luminance and performance in display devices.
Implementation Method 1
a first light emitting element and a second light emitting element spaced apart from each other, each disposed on the substrate in the emission area
Implementation Method 2
light emitting elements, e.g., light emitting diodes (LED)
Data Source
AI summary
A display device includes an external bank defining an emission area, a first and second light emitting elements spaced apart from each other in the emission area, each including a first end and a second end, a first connection electrode electrically contacting the first end of the first light emitting element, a second connection electrode spaced apart from the first connection electrode and electrically contacting the first end of the second light emitting element, a first insulating layer on the first and second connection electrodes exposing the second ends of the first and the second light emitting elements, a third connection electrode electrically contacting the second end of the first light emitting element, and a fourth connection electrode electrically contacting the second end of the second light emitting element, and electrically connected to the first connection electrode through a contact hole penetrating the first insulating layer.