LED Display Common Electrode Strips for Uniform Pixel Brightness
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Solution Overview
Problem
Conventional LED and OLED displays face issues with current resistance (IR) voltage drop and uneven pixel luminescence due to conductive electrodes, which affect light emission efficiency and brightness, especially in high-resolution and dense pixel layouts.
Innovation Solution
The design incorporates a light-emitting diode display device with a control circuit layer, multiple electrodes, and a common electrode layer comprising equivalent one-dimensional electrode strips that intersect perpendicularly with scanning lines, reducing IR voltage drop and increasing pixel aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive metal electrodes are used in the common electrode layer, then electrical conductivity is improved, but current resistance (IR) voltage drop increases and optical transparency deteriorates
Solution Approach 1:
The common electrode layer is segmented into multiple independent transparent conductive strips arranged in array, rather than using a continuous metal electrode. This segmentation reduces the total conductive material needed and minimizes IR voltage drop while maintaining electrical connectivity to all pixel elements.
Solution Approach 2:
Different regions of the electrode structure have different properties: transparent conductive strips provide localized conductivity where needed, while non-conductive regions maintain optical transparency. The electrode configuration is optimized locally to balance electrical performance and optical properties.
2Illumination intensity
If the area of conductive metal electrodes is reduced to increase aperture ratio, then optical transparency is improved, but electrical conductivity deteriorates
Solution Approach 1:
The electrode system is divided into multiple thin transparent conductive strips rather than one large metal electrode. This allows the total electrode area to be minimized for high aperture ratio while maintaining sufficient conductivity through the distributed strip configuration.
Solution Approach 2:
Traditional metal electrodes are replaced with transparent conductive materials that can be deposited in thin patterns. This substitution enables both high optical transparency and adequate electrical conductivity through optimized material selection and pattern design.
3Use of energy by moving object
If scanning technology is used to control multiple pixel rows, then power consumption is reduced, but brightness uniformity deteriorates due to IR voltage drop
Solution Approach 1:
The common electrode is segmented into multiple independent transparent strips, each with low resistance. This segmentation ensures that voltage drop along each strip is minimal, maintaining uniform brightness across all pixel rows even when scanning technology is used to reduce power consumption.
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 enhances pixel luminous efficiency and uniformity while minimizing thermal energy consumption, leading to stable performance and a longer lifespan of the display device.
Implementation Method 1
Pixelated photon-emitting elements: These elements are located on the front plane of the display and utilize technologies such as semiconductor light-emitting diodes (LED) and organic light-emitting diodes (OLED). They emit light to form images.
Implementation Method 2
They emit light to form images
Data Source
AI summary
The disclosure describes a light-emitting diode (LED) display device with a control circuit layer, multiple electrodes, multiple LEDs, and a common electrode layer. The control circuit layer is coupled with multiple scan lines and data lines, with the scan lines and data lines intersecting substantially perpendicularly. The electrodes are positioned on the control circuit layer and coupled to the control circuit layer, with all electrodes electrically isolated. The LEDs are respectively placed on the electrodes and are coupled to them, arranged in an array. The common electrode layer comprises multiple equivalent one-dimensional (1D) electrode strips. The different ends of the equivalent 1D electrode strips connect to a supply voltage. The equivalent 1D electrode strips are respectively placed on multiple columns of the LED array and are coupled to multiple columns of the LED array, intersecting the scan lines substantially perpendicularly.