Display Backplane Mirror Current Control for RGB Grayscale
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional display backplanes are unable to meet the requirements for high-resolution, high-frame-rate, and full-color display due to limitations in clock frequency, particularly in achieving 256 grayscale levels for RGB subpixels.
Innovation Solution
A display backplane with a mirror current source module that adjusts adjustment currents to sub-pixel units of different colors, utilizing a pixel drive circuit with signal receiving, storage, and switch modules, and incorporating subfield scanning to control luminous flux and grayscale independently for each color.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional clock frequencies are used for display backplane, then device complexity is reduced, but display resolution and grayscale levels cannot meet full-color display requirements
Solution Approach 1:
The pixel drive circuit is segmented into multiple functional modules: signal receiving module, signal storage module, switch module, and adjustment module. This segmentation allows each module to perform a specific function independently, enabling full-color display with 256 grayscale levels while maintaining manageable circuit complexity through modular design.
Solution Approach 2:
The patent introduces a mirror current source module that operates in a separate control dimension from the traditional clock signal. By controlling the adjustment current through this additional dimension, the system achieves 256 grayscale levels for RGB subpixels without requiring proportional increases in clock frequency, thus resolving the contradiction between precision and complexity.
2Adaptability or versatility
If digital subfield scanning is used for monochrome display, then ease of operation is maintained, but full-color display with 256 grayscale levels cannot be achieved
Solution Approach 1:
The pixel drive circuit is designed with universal functionality that can handle both monochrome and full-color display modes. The signal storage module and adjustment module work together to provide 256 grayscale levels for each RGB subpixel, allowing the same circuit architecture to serve multiple display modes without increasing operational complexity.
Solution Approach 2:
The adjustment module acts as an intermediary between the signal storage module and the light-emitting device. It translates the stored signal into precise adjustment currents that control the luminous flux of RGB subpixels, enabling full-color display with 256 grayscale levels while maintaining simple digital subfield scanning operation.
3Productivity
If clock frequency is increased to meet full-color display requirements, then display performance is improved, but power consumption and device reliability deteriorate
Solution Approach 1:
The patent changes the control parameter from clock frequency to adjustment current magnitude. By controlling the display refresh rate and grayscale levels through the mirror current source module and adjustment modules, the system achieves high productivity (full-color display with 256 grayscale levels) without increasing clock frequency, thus avoiding increased power consumption and reliability issues.
Data Source
AI summary
A display backplane and a display device are provided. The display backplane includes sub-pixel units and a mirror current source module. Each sub-pixel unit includes a pixel drive circuit with an adjustment module and a light-emitting device. The mirror current source module is electrically connected to the adjustment modules in multiple pixel drive circuits and is used to adjust the adjustment currents input to the adjustment modules. The mirror current source module inputs different adjustment currents to the sub-pixel units of different colors.