LED Display Common Electrode Branch Segmentation for Current Precision
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Solution Overview
Problem
Conventional LED display panels suffer from imprecise light intensities due to resistance in signal lines and scanning electrodes, leading to incorrect white balance and compromised image quality, as different color LEDs receive varying currents despite predefined driving currents.
Innovation Solution
The solution involves an apparatus with separate common electrode branches for each color of LEDs in an EL array, allowing each color to have a distinct common return path, and pre-charging with voltages tailored to their electrical response characteristics to maintain predefined currents and minimize white balance shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single common electrode is used for all color LEDs, then the device complexity is reduced, but the current distribution becomes imprecise due to resistance in the common electrode affecting different color LEDs differently
Solution Approach 1:
The common electrode is segmented into multiple color-specific branches (red branch, green branch, blue branch), with each branch dedicated to carrying current to LEDs of a specific color. This segmentation isolates the current paths, preventing resistance-induced current distribution errors that would occur in a shared common electrode, thereby achieving precise current control for each color while maintaining reasonable device complexity.
2Measurement precision
If separate common electrode branches are used for each color LED, then the current distribution precision is improved, but the device complexity increases
Solution Approach 1:
Each color-specific branch of the common electrode is optimized locally for its designated color LED requirements, including appropriate resistance characteristics and dimensional proportions. The first branch, second branch, and third branch are configured with different electrical properties tailored to the specific current needs of red, green, and blue LEDs respectively, achieving precise current distribution through localized optimization rather than uniform design.
Solution Approach 2:
The resistance values, dimensions, and proportions of the common electrode branches are specifically adjusted to compensate for the different electrical characteristics of various color LEDs. By changing the parameters (resistance, width, length) of each branch, the system achieves precise current distribution across different color LEDs despite their varying forward voltage and current requirements.
3Ease of operation
If predefined driving currents are applied to all color LEDs, then the ease of operation is improved, but the white balance accuracy deteriorates due to resistance effects in signal lines and scanning electrodes
Solution Approach 1:
The common electrode is segmented into multiple color-specific branches (red branch, green branch, blue branch), with each branch dedicated to carrying current to LEDs of a specific color. This segmentation isolates the current paths, preventing resistance-induced current distribution errors that would occur in a shared common electrode, thereby achieving precise current control for each color while maintaining reasonable device complexity.
Solution Approach 2:
Each color-specific branch of the common electrode is optimized locally for its designated color LED requirements, including appropriate resistance characteristics and dimensional proportions. The first branch, second branch, and third branch are configured with different electrical properties tailored to the specific current needs of red, green, and blue LEDs respectively, achieving precise current distribution through localized optimization rather than uniform design.
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 arrangement ensures that each color LED receives the intended current, reducing white balance shifts and enhancing image quality by allowing individual control over different color LEDs, thereby improving the overall brightness uniformity and visual accuracy.
Implementation Method 1
a first electroluminescent (EL) component... a second EL component... configured to emit light in a first waveband, respectively a second waveband
Data Source
AI summary
A light-emitting diode (LED) includes a first electroluminescent (EL) component, a second EL component, a first segment electrode, a second segment electrode, and a first common electrode. The first segment electrode is electrically connected to the first EL component. The second segment electrode is electrically connected to the second EL component. The first common electrode has a first branch and a second branch which extend along a first direction and are arranged in a second direction different than the first direction. The first branch is located between the second branch and either of the first and second EL components, and the first and second branches are electrically connected to the first and second EL components, respectively.