Pixel Driving Circuit Capacitance Optimization for Power Reduction
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Solution Overview
Problem
In display technology, particularly with Micro LED and Mini LED, the high power consumption issue arises due to the differing luminous efficiencies of red, green, and blue light-emitting units, leading to unnecessary power loss when they are supplied with the same driving voltage, which complicates circuit design and occupies more space.
Innovation Solution
A pixel driving circuit with distinct driving units for each color subpixel, each including a capacitor with varying capacitance, allows for different driving currents under the same voltage signal, reducing power loss without complex circuit redesigns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If different driving voltages are applied to different light emitting units to reduce power loss, then power consumption is reduced, but circuit complexity increases and design space is occupied
Solution Approach 1:
The patent applies local quality by assigning different capacitance values to different driving units corresponding to different color subpixels. Each driving unit (first, second, third driving units) has a specifically designed capacitance (first capacitance, second capacitance, third capacitance) optimized for its respective subpixel's luminous efficiency characteristics, allowing tailored current control without complex voltage differentiation
Solution Approach 2:
The patent changes the capacitance parameter of the driving units to achieve different driving currents. By adjusting capacitance values (first capacitance ≠ second capacitance ≠ third capacitance), the system optimizes power consumption for each color subpixel while using the same driving voltage signal, thus resolving the contradiction between power reduction and circuit simplicity
2Illumination intensity
If red light-emitting units are supplied with higher driving current to compensate for low luminous efficiency, then display quality is maintained, but power consumption increases
Solution Approach 1:
The patent implements local quality by providing color-specific capacitance values (first capacitance for red, second capacitance for green, third capacitance for blue) that are optimized for each color's luminous efficiency characteristics, enabling tailored current control to maintain display quality while minimizing power consumption
Solution Approach 2:
The patent changes the capacitance parameter of each driving unit to achieve optimal driving currents for different color subpixels. This parameter optimization allows the system to supply appropriate current to red subpixels (which have lower luminous efficiency) while avoiding excessive current to green and blue subpixels, thus balancing display quality with power consumption
Data Source
AI summary
A pixel driving circuit and a display panel are provided. The pixel driving circuit, including a first-color subpixel, a second-color subpixel, and a third-color subpixel, is configured to drive a pixel unit. The pixel driving circuit includes a first driving unit, a second driving unit, and a third driving unit. The first driving unit is configured to drive according to a first voltage signal the first-color subpixel. The second driving unit is configured to drive according to the first voltage signal the second-color subpixel. The third driving unit is configured to drive according to the first voltage signal the third-color subpixel. The first driving unit at least includes a first capacitor, the second driving unit at least includes a second capacitor, the third driving unit at least includes a third capacitor, and at least one of the first capacitor, the second capacitor, and the third capacitor has a different capacitance.