Display Apparatus Data Driving Circuit with Time-Division Multiplexing
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Solution Overview
Problem
The high manufacturing costs of display apparatuses are attributed to the need for multiple integrated circuits due to the requirement of a corresponding number of output lines in data driving circuits.
Innovation Solution
A display apparatus design that reduces the number of output lines by utilizing a first pixel in an odd-numbered column and a second pixel in an even-numbered column, each with specific transistor configurations and connections, allowing for shared data signal supply through a single output line, and a driving circuit that supplies data signals to both pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple output lines are provided in the data driving circuit to supply data signals to each data line, then the data signal supply is reliable and complete, but the number of integrated circuits increases and manufacturing cost increases
Solution Approach 1:
The patent merges the function of multiple output lines into a single output line by implementing time-division multiplexing. The distribution transistor sequentially connects different data lines to the same output line at different time periods, allowing one output line to serve multiple data lines. This reduces the number of integrated circuits needed while maintaining complete data signal supply to all pixels.
Solution Approach 2:
The patent employs periodic action through sequential switching of distribution transistors. Each distribution transistor is turned on in a specific time sequence to connect its corresponding data line to the shared output line. This periodic switching ensures that all data lines receive their data signals in turn, maintaining reliability while reducing hardware complexity.
2Adaptability or versatility
If multiple output lines are provided in the data driving circuit, then each data line can be driven independently, but the manufacturing cost increases
Solution Approach 1:
The patent makes a single output line universal by enabling it to serve multiple data lines through the distribution transistor network. Each distribution transistor acts as a switch that directs the output line's data signal to the appropriate data line in sequence. This multi-functionality approach maintains the ability to drive all data lines independently while reducing manufacturing cost by eliminating redundant output lines and integrated circuits.
Solution Approach 2:
The patent segments the data signal supply process into distinct time periods, with each distribution transistor handling a specific time slot. This temporal segmentation allows a single output line to effectively serve multiple data lines without interference, maintaining adaptability while reducing the number of physical output lines needed for manufacturing.
3Productivity
If distribution transistors with different conductivity types are used in odd and even columns, then sequential turning on is achieved, but the transistor configuration complexity increases
Solution Approach 1:
The patent introduces asymmetry in transistor configuration by using different conductivity types (N-type for odd columns, P-type for even columns) in distribution transistors across different column groups. This asymmetric design enables sequential control of distribution transistors through gate signals, allowing efficient time-division multiplexing of the output line. The increased transistor configuration complexity is justified by the significant improvement in data signal distribution efficiency and the reduction in overall circuit complexity.
Data Source
AI summary
A display apparatus including: a first pixel in an odd-numbered column; and a second pixel in an even-numbered column and in a same row as the first pixel, each of the first and second pixel includes: a light-emitting device; a first transistor to output a current corresponding to a data signal; a second transistor connected to the first transistor; a sensing transistor connected to the light-emitting device and a sensing line; and a distribution transistor connected in series with the second transistor, between a data line to supply the data signal and the second transistor, a conductivity type of the distribution transistor of the first pixel is different from a conductivity type of the distribution transistor of the second pixel, and when the second transistor of the first and second pixels are turned on, the distribution transistor of the first and second pixels are sequentially turned on.