Micro-LED Pixel Capacitance Layout for RGB Luminance Balance
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Solution Overview
Problem
Micro-LED display devices face challenges in achieving balanced luminance levels for red, green, and blue pixels due to differences in luminous efficacy, leading to increased manufacturing costs and power consumption when trying to adjust voltage ranges for each pixel.
Innovation Solution
The display device incorporates a unique configuration where the value of the auxiliary capacitance of the first pixel displaying red is made the largest among all pixels, allowing for adjustment of the balance of luminance levels by reducing the attenuation of the current necessary for red light emission, thereby aligning the dynamic range of the image signal across all pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If voltage ranges are adjusted for each pixel to compensate for differences in luminous efficacy, then balanced luminance levels are achieved, but manufacturing costs increase
Solution Approach 1:
The patent changes the electrical parameter (auxiliary capacitance value) to compensate for luminous efficacy differences. By setting the auxiliary capacitance of red pixels to be larger than that of green and blue pixels, the patent adjusts the voltage attenuation characteristics to achieve balanced luminance without requiring separate voltage range adjustments for each pixel type, thereby reducing manufacturing complexity and cost.
2Illumination intensity
If voltage ranges are adjusted for each pixel to compensate for differences in luminous efficacy, then balanced luminance levels are achieved, but power consumption increases
Solution Approach 1:
The patent modifies the auxiliary capacitance parameter to optimize power consumption. By carefully selecting the auxiliary capacitance values, the patent reduces voltage attenuation to a specific range (0.05V to 0.5V) during the emission period, which minimizes the additional power required while achieving balanced luminance across red, green, and blue pixels.
3Illumination intensity
If larger auxiliary capacitance is used for red pixels, then luminance balance is improved, but current attenuation is reduced
Solution Approach 1:
The patent converts the harmful effect of current attenuation (which causes luminance imbalance) into a beneficial effect by using it as a design parameter. By intentionally designing larger auxiliary capacitance for red pixels, the patent exploits the resulting reduced current attenuation to achieve luminance balance, turning what could be seen as a deviation from uniform design into a purposeful compensation mechanism.
4Device complexity
If uniform auxiliary capacitance is used for all pixels, then device complexity is reduced, but luminance balance deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the auxiliary capacitance values based on the specific luminous efficacy requirements of each pixel type. Red pixels are assigned larger auxiliary capacitance values compared to green and blue pixels, creating a non-uniform configuration that is optimized for local luminance balance rather than applying a single uniform value across all pixels.
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 display device to maintain balanced luminance levels for red, green, and blue pixels without the need for increased manufacturing costs or higher power consumption, allowing for efficient use of existing panel drivers and reducing the strain on voltage durability.
Implementation Method 1
an insulating layer interposed between the pixel electrode and the first capacitance electrode layer to form an auxiliary capacitance together with the pixel electrode and the first capacitance electrode layer
Implementation Method 2
LED display devices using light emitting diodes (LED) that are spontaneous light-emitting elements
Implementation Method 3
a display device (hereinafter referred to as a micro-LED display device) in which minute light-emitting diodes referred to as micro-LED are mounted
Data Source
AI summary
According to one embodiment, a display device includes a display region where pixels are arranged. Each of the pixels includes a pixel electrode, a light emitting element, a drive transistor, a first capacitance electrode layer opposed to the pixel electrode and held at a constant potential, and an insulating layer forming an auxiliary capacitance together with the pixel electrode and the first capacitance electrode layer. A value of the auxiliary capacitance of the first pixel, of the values of the auxiliary capacitance of the pixels is the largest.