Display Multiplexing Circuit for Narrow Bezels and Uniform Brightness
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Solution Overview
Problem
The existing display technologies face challenges in achieving a narrow bezel and uniform brightness due to the large number of data signal lines, leading to voltage attenuation and vertical bright and dark stripes, which affect the display effect.
Innovation Solution
A multiplexing circuit is introduced to connect multiple sub-pixels with a single data transmission line, controlled by selection signal lines, ensuring non-overlapping effective time periods for different color sub-pixels, and optimizing the sequence and timing of selection signal line activations to minimize parasitic capacitance differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple data signal lines are used to connect each sub-pixel, then each sub-pixel can be independently controlled, but the number of signal lines increases leading to larger bezel size and voltage attenuation
Solution Approach 1:
Multiple data signal lines are merged into a single data transmission line through the multiplexing circuit. The multiplexing circuit sequentially connects different data signal lines to the single data transmission line based on selection signal groups, reducing the number of transmission lines needed while maintaining independent control of each sub-pixel.
Solution Approach 2:
The control of data signal lines is segmented into multiple selection signal groups, where each group controls specific data signal lines at different time periods. This segmentation allows sequential access to multiple data signal lines through a single transmission line, reducing the overall number of lines required.
2Reliability
If multiple data signal lines are used to ensure sufficient signal strength, then voltage attenuation is reduced, but the number of lines increases leading to more parasitic capacitance differences and vertical bright/dark stripes
Solution Approach 1:
Multiple data signal lines are combined into a single transmission line through the multiplexing circuit, which sequentially connects them. This merging reduces the total number of transmission lines and their associated parasitic capacitances, thereby minimizing variations in parasitic capacitance that cause vertical bright and dark stripes.
Solution Approach 2:
The multiplexing circuit uses periodic selection signal groups to sequentially activate different data signal lines at specific time periods. This periodic action ensures that each data signal line is activated in a controlled manner, minimizing the impact of parasitic capacitance variations and preventing vertical bright and dark stripe artifacts.
3Area of stationary object
If the number of data transmission lines is reduced, then bezel size is minimized, but signal transmission capability may be compromised
Solution Approach 1:
The multiplexing circuit dynamically switches the connection between data signal lines and the single data transmission line based on timing signals. This dynamic switching allows the single transmission line to carry multiple data signals sequentially, maintaining signal transmission capability while reducing the number of physical lines and bezel size.
Solution Approach 2:
The selection signal groups are activated in a predetermined sequence before data transmission occurs. This preliminary activation ensures that the multiplexing circuit is ready to receive and transmit data signals through the correct data signal line at the appropriate time, maintaining signal transmission quality despite using fewer lines.
Data Source
AI summary
Disclosed is a display substrate, including: multiple sub-pixels arranged in an array, multiple multiplexing circuits, multiple data signal lines, multiple selection signal lines and multiple data transmission lines, wherein the multiple sub-pixels include multiple color sub-pixels, and the data signal lines are electrically connected to the multiple sub-pixels; the multiple multiplexing circuits include multiple multiplexing transistors, which are respectively electrically connected to the data transmission lines, the selection signal lines and the data signal lines; the multiple selection signal lines are divided into multiple selection signal groups, and at least one selection signal group include multiple selection signal lines; the selection signal lines included in different selection signal groups are different, and the selection signal groups are electrically connected to the sub-pixels by means of the multiplexing transistors and the data signal lines; the colors of the sub-pixels electrically connected to the same selection signal group are the same.