LED Pixel Circuit Layout for Defect Repair and Lower Power
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Solution Overview
Problem
Existing light emitting diode (LED) display apparatuses face challenges in reliability due to defective pixels caused by defects in micro light emitting diode devices, and they also consume high power.
Innovation Solution
The proposed light emitting diode display apparatus includes a pixel configuration with a first and second light emitting portion connected to gate lines and data lines, a common connection pattern connecting both light emitting portions in common, and a third light emitting portion connected between the second driving power line and the common connection pattern, allowing for overlapping of the common connection pattern with the second driving power line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a micro light emitting diode device is transferred to a thin film transistor array substrate, then picture quality and reliability are improved, but defective pixels may occur due to defects in the micro light emitting diode device
Solution Approach 1:
The pixel is divided into multiple light emitting portions (first, second, and third light emitting portions) that can be independently controlled. This segmentation allows selective activation of functional portions while bypassing defective ones, thereby maintaining display reliability and productivity even when some portions are defective.
Solution Approach 2:
The patent changes the operational parameters by introducing multiple driving power lines (first and second driving power lines) and enabling flexible connection configurations. This allows dynamic adjustment of current paths through the common connection pattern, optimizing performance while compensating for defects in micro light emitting diode devices.
2Ease of manufacture
If conventional light emitting diode display apparatus is used, then manufacturing is simplified, but power consumption is high
Solution Approach 1:
By segmenting the pixel into multiple light emitting portions with separate control, the patent enables selective activation of only necessary portions. This reduces overall power consumption while maintaining manufacturing simplicity through the modular structure that can be integrated into existing production processes.
Solution Approach 2:
The patent implements periodic or selective activation of different light emitting portions through the multiple gate lines and driving power lines. This allows the display to achieve the same visual output with lower average power consumption by activating portions in a controlled, periodic manner rather than continuously.
3Illumination intensity
If multiple light emitting devices are connected in parallel, then brightness is improved, but power consumption increases
Solution Approach 1:
The patent applies local quality by creating different connection configurations for different light emitting portions. The common connection pattern allows some portions to be series-connected while others remain parallel, optimizing the balance between brightness and power consumption locally within each pixel rather than using a uniform connection scheme.
Solution Approach 2:
The patent introduces dynamic control through multiple gate lines and driving power lines that can selectively activate different connection configurations. This allows the system to dynamically adjust between parallel and series connections based on power availability and brightness requirements, achieving optimal performance under varying conditions.
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 enables the repair of defective pixels, improves reliability and yield, and reduces power consumption by allowing the third light emitting device to be series-connected with the first and second light emitting devices, thereby reducing the input current and power consumption.
Implementation Method 1
a first light emitting device ED1 connected with the pixel circuit PC1, a second light emitting device ED2 connected with the second pixel circuit PC2, and a third light emitting device ED3
Implementation Method 2
light emitting diode display apparatus comprising a pixel disposed on a substrate and configured to display an image
Data Source
Figure 1
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AI summary
The light emitting diode display apparatus comprises a pixel disposed on a substrate and configured to display an image. The pixel includes a first light emitting portion configured to connect with a first gate line disposed in a first direction, a data line disposed in a second direction which is perpendicular to the first direction, and a first driving power line which is parallel to the data line, a second light emitting portion configured to connect a second gate line which is parallel to the first gate line, the data line, and the first driving power line, a common connection pattern configured to connect with the first light emitting portion and the second light emitting portion in common, and a third light emitting portion configured to connect between the second driving power line and the common connection pattern. Some of the common connection pattern is configured to overlap with the second driving power line.