Micro-LED Pixel Circuit Layout to Prevent Screen Defects
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Solution Overview
Problem
Liquid crystal display (LCD) devices suffer from reduced luminance and response time due to the need for a backlight unit, while organic light emitting display devices are vulnerable to water, leading to reliability issues, and light emitting diode display devices face screen defects from micro light emitting diode device defects during transfer.
Innovation Solution
A light emitting diode display device with a pixel circuit including multiple light emitting diode devices and driving transistors, and a concave portion to accommodate these devices, minimizing alignment errors and screen defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple light emitting diode devices are transferred onto a TFT array substrate, then the display device achieves high image quality and reliability, but screen defects occur due to defects in the micro light emitting diode devices during the transfer process
Solution Approach 1:
The pixel electrode is divided into multiple regions corresponding to multiple light emitting diode devices, with each region independently connected to its respective device. This segmentation allows individual defects to be isolated and compensated without affecting the entire pixel, thereby maintaining high reliability while managing the complexity of multiple device transfers.
Solution Approach 2:
The patent implements a compensation mechanism where the pixel circuit is designed to detect and compensate for defects in light emitting diode devices before they cause screen defects. By preparing compensation circuits and alternative current paths in advance, the system can mitigate the impact of transfer defects and maintain display quality.
2Ease of operation
If LCD devices use a backlight unit to display images, then the display can be achieved, but the design is limited and luminance and response time are reduced
Solution Approach 1:
The invention extracts the light emission function from a separate backlight unit and integrates it directly into the pixel structure through self-emissive light emitting diode devices. This eliminates the need for a backlight unit, thereby removing design limitations and enabling faster response times since light is generated directly at the pixel level without the delays inherent in backlight systems.
3Power
If organic light emitting display devices are used, then the display can emit light without a backlight, but the devices are vulnerable to water causing reduction in reliability and lifetime
Solution Approach 1:
The patent employs composite material structures including encapsulation layers and protective coatings that combine multiple materials with complementary properties. These composite structures provide both the light emission functionality and enhanced protection against water and environmental factors, thereby maintaining reliability while preserving self-emission capabilities.
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
Enhances alignment precision, reduces thickness, and prevents screen defects by using redundant light emitting diode devices and concave portions, improving reliability and image quality.
Implementation Method 1
a plurality of subpixels which each include first to Nth (where N is a natural number equal to or greater than two) light emitting diode devices emitting light with the data current
Data Source
AI summary
Disclosed is a light emitting diode display device for minimizing a screen defect caused by a defect of a light emitting diode device. The light emitting diode display device includes a plurality of subpixels which each include first to Nth (where N is a natural number equal to or greater than two) light emitting diode devices emitting light with the data current and a pixel circuit including first to Nth driving transistors respectively supplying the data current corresponding to a data signal to the first to Nth light emitting diode devices.