Pixel Driving Circuit Demultiplexer for AMOLED Color Deviation
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Solution Overview
Problem
In AMOLED display panels, the RGBG pixel arrangement mode leads to color deviation due to waveform delays in the stage transmission process, causing miswriting of Vdata voltage and resulting in incorrect color display, such as bluish red and reddish blue images.
Innovation Solution
The implementation of a pixel driving circuit with at least four gate lines and eight data lines arranged in a specific configuration, along with a demultiplexer circuit, ensures that data signals for sub-pixels of the same color are input correctly, preventing miswriting and maintaining color consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If RGBG pixel arrangement mode is adopted to increase aperture ratio, then the aperture ratio is improved, but color deviation occurs due to waveform delay in stage transmission
Solution Approach 1:
The data line is segmented into multiple sub-data lines (first data line and second data line) that are spatially separated and independently controlled. The first data line connects to red sub-pixels while the second data line connects to green sub-pixels, allowing independent data transmission for different colors and preventing waveform delay-induced miswriting between color channels.
Solution Approach 2:
A data line switching unit is introduced as an intermediary component between the data line and pixel circuits. This switching unit selectively connects to different data lines based on the scanning stage, ensuring that data signals are correctly routed to the appropriate sub-pixels without interference from other color channels during the writing process.
2Productivity
If stage transmission is used to drive pixel circuits, then the driving efficiency is improved, but waveform delay causes Vdata voltage miswriting in previous frames
Solution Approach 1:
The data transmission path is segmented into separate channels for different colors. By dividing the data line into color-specific sub-data lines, the patent eliminates cross-color interference during stage transmission, ensuring that Vdata voltage for each color is written accurately without being affected by waveform delays from other color channels.
Solution Approach 2:
The patent performs preliminary separation of data lines into color-specific channels before the stage transmission process begins. This preliminary configuration ensures that when stage transmission occurs, each color channel has its own dedicated data path, preventing miswriting of Vdata voltage from previous frames.
3Device complexity
If conventional data line configuration is used, then the device complexity is low, but color deviation occurs due to waveform delay
Solution Approach 1:
The data line is segmented into multiple color-specific sub-data lines that are spatially separated. This segmentation increases device complexity slightly but prevents color deviation by ensuring that each color channel has its own dedicated data transmission path, eliminating waveform delay-induced interference between colors.
Solution Approach 2:
A data line switching unit is introduced as an intermediary component that manages connections between data lines and pixel circuits. This switching unit, while increasing device complexity, ensures accurate data routing by selectively connecting to the appropriate data line based on the scanning stage, thereby preventing color deviation.
Data Source
AI summary
A pixel driving circuit, a display panel, and an electronic device. The pixel driving circuit includes: a pixel array including a plurality of pixel circuits, an RGBG pixel arrangement mode being adopted in the pixel array; at least four gate lines, arranged in a first direction of the pixel array, one row of pixel circuits being arranged between every two adjacent gate lines, and each row of pixel circuits corresponding to one gate line; at least eight data lines, arranged in a second direction perpendicular to the first direction and intersecting each gate line, each data line being connected to pixel circuits corresponding to sub-pixels of the same color in one column of pixel circuits; and a demultiplexer circuit, connected to the data lines, and configured to control the data lines to be in communication with an integrated circuit chip.