Micro-LED Pixel Auxiliary Capacitance 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 using existing panel drivers.
Innovation Solution
The display device incorporates a larger auxiliary capacitance for the red pixel, making it the largest among the three color pixels, to adjust the balance of luminance levels by reducing current attenuation, allowing the use of existing panel drivers and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If existing panel drivers are used for micro-LED display devices, then device complexity is reduced, but luminance balance between red, green, and blue pixels deteriorates due to differences in luminous efficacy
Solution Approach 1:
The patent applies local quality by providing different auxiliary capacitance values to different color pixels (red, green, blue) based on their specific luminous efficacy characteristics. The red pixel is assigned a larger auxiliary capacitance than the green and blue pixels to compensate for its lower luminous efficacy, thereby achieving balanced luminance across all colors while using a standard panel driver.
2Illumination intensity
If larger auxiliary capacitance is provided to red pixels to compensate for lower luminous efficacy, then luminance balance is improved, but device complexity increases due to non-uniform capacitance configuration
Solution Approach 1:
The patent implements local quality by configuring different auxiliary capacitance values specifically for red pixels compared to green and blue pixels. This targeted approach adjusts luminance balance at the pixel level without requiring complex system-wide modifications, as the capacitance difference is built into the pixel structure itself.
Solution Approach 2:
The patent applies parameter changes by modifying the auxiliary capacitance value parameter for red pixels to be larger than that of green and blue pixels. This parameter adjustment compensates for the lower luminous efficacy of red LEDs, achieving luminance balance through a simple quantitative change rather than complex control mechanisms.
3Illumination intensity
If current attenuation is reduced through larger auxiliary capacitance, then luminance balance is improved, but power consumption increases
Solution Approach 1:
The patent uses parameter changes by optimizing the auxiliary capacitance value for red pixels to achieve the minimum necessary capacitance for luminance balance. By carefully selecting the capacitance parameter, the patent reduces current attenuation effects while minimizing the impact on power consumption, avoiding excessive energy usage.
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.