OLED Display De-multiplexer Circuit Reduces IC Count
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Solution Overview
Problem
The manufacturing costs of organic light-emitting display apparatuses increase due to the high number of integrated circuits required for data drivers and control circuits, which are necessary to manage the numerous data lines used in self-emissive devices like OLEDs.
Innovation Solution
A display apparatus is designed with a de-multiplexer and switch circuits that reduce the number of output lines from the data driver by distributing data signals to multiple data lines through a series of switches, allowing for fewer integrated circuits and lower manufacturing costs, while also incorporating a black signal transmission mechanism to prevent brightness deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a plurality of data lines are used to drive OLED pixels, then the display resolution and image quality are improved, but the number of integrated circuits for data drivers increases, leading to higher manufacturing costs
Solution Approach 1:
The data driver's output lines are segmented into multiple groups, with each group connected to a separate integrated circuit. A de-multiplexer distributes data signals from fewer output lines to multiple data lines by sequentially activating first switches and second switches. This segmentation allows high-resolution display with fewer integrated circuits by dividing the data transmission task across multiple time slots and switch groups.
Solution Approach 2:
The system dynamically switches between different data transmission paths using controllable first switches and second switches. The de-multiplexer dynamically assigns different data lines to different output lines at different time periods, enabling flexible resource allocation. This dynamic switching allows the same hardware configuration to support multiple data lines without proportionally increasing the number of integrated circuits.
2Ease of manufacture
If the number of integrated circuits is reduced to lower manufacturing costs, then manufacturing cost is improved, but the ability to manage numerous data lines deteriorates
Solution Approach 1:
Each integrated circuit's output line serves multiple functions by sequentially driving different data lines through the de-multiplexer. The same output line can manage multiple data lines at different time periods, making the integrated circuit universal rather than dedicated to a single data line. This multi-functionality reduces the total number of integrated circuits needed while maintaining full data line management capability.
Solution Approach 2:
The de-multiplexer operates periodically, cycling through different switching states to distribute data signals to different data lines in sequential time periods. First switches and second switches are activated in a periodic pattern, allowing a single output line to serve multiple data lines over time. This periodic action enables fewer integrated circuits to manage more data lines by time-division multiplexing.
3Productivity
If data signals are transmitted to multiple data lines simultaneously, then data transmission efficiency is improved, but brightness deviations occur due to signal interference
Solution Approach 1:
Data transmission is segmented into sequential time periods, with each period dedicated to transmitting data to a specific group of data lines. First switches and second switches divide the data lines into multiple groups that are activated sequentially rather than simultaneously. This segmentation eliminates signal interference between adjacent data lines while maintaining overall transmission efficiency through parallel processing of different line groups across time periods.
Solution Approach 2:
The switching configuration dynamically changes between time periods to activate different groups of data lines. At any given moment, only specific first switches and second switches are closed, creating dynamic isolation between active data lines. This dynamic switching prevents crosstalk and signal interference, ensuring uniform brightness across all pixels while maintaining high data transmission throughput through rapid sequential switching.
Data Source
AI summary
A display apparatus includes a de-multiplexer having a number of first switches equal to a number of data lines. Each of the first switches is connected to a first end of a corresponding one of the data lines. The display apparatus also includes a plurality of switch circuits. Each switch circuit includes a plurality of second switches. Each the second switches are substantially in parallel and are connected to a second end of a corresponding one of the data lines.