OLED Display Multiplexer Signal Line Sharing
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Solution Overview
Problem
Conventional organic light-emitting diode (OLED) display devices using external compensation methods require additional compensation circuits and separate integrated chips for reference voltage supply and sensing, leading to increased cost and limited aperture ratio due to the need for multiple signal lines.
Innovation Solution
An OLED display device with a multiplexer (MUX) that electrically connects output terminals of the data driver to pixels in a 1:1, 1:N, or N:N structure, allowing for shared signal lines between adjacent pixels, reducing the number of integrated chips and signal lines, and improving aperture ratio by enabling efficient data voltage compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external compensation method is used with separate integrated chips for reference voltage supply and sensing, then compensation capability for threshold voltage difference is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines the reference voltage supply function and reference voltage sensing function into a single integrated chip, eliminating the need for separate integrated chips. This merging reduces device complexity and cost while maintaining the compensation capability for threshold voltage differences between driving transistors.
Solution Approach 2:
The integrated chip performs multiple functions: it supplies reference voltage to pixels, senses reference voltage variations, and provides compensation signals. This multi-functional design replaces what previously required separate dedicated chips for each function, reducing overall system complexity.
2Measurement precision
If multiple signal lines are formed in display panel for reference voltage supply and sensing, then compensation precision is improved, but aperture ratio decreases
Solution Approach 1:
The patent merges the reference voltage supply line and reference voltage sensing line into a shared signal line. Adjacent pixels share common signal lines for reference voltage supply and sensing, reducing the total number of signal lines required in the display panel and thereby increasing the aperture ratio while maintaining compensation precision.
Solution Approach 2:
Signal lines are designed to serve multiple purposes: they supply reference voltage to multiple pixels and simultaneously sense reference voltage variations from those pixels. This multi-functional signal line design reduces the number of dedicated lines needed, preserving aperture ratio.
3Reliability
If additional compensation circuits are added to each pixel, then threshold voltage compensation is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines compensation circuits from multiple pixels into a shared architecture on a single integrated chip. Instead of having fully independent compensation circuits in each pixel, the design shares sensing and control resources, reducing the total component count and manufacturing cost while maintaining compensation effectiveness.
Solution Approach 2:
The integrated chip contains replicated functional units that can serve multiple pixels. By copying essential compensation functions onto the integrated chip rather than duplicating full compensation circuits in each pixel, the design reduces manufacturing complexity and cost.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution reduces the number of integrated chips and signal lines, thereby lowering costs and enhancing the aperture ratio by allowing for efficient data voltage compensation and sharing of signal lines between adjacent pixels.
Implementation Method 1
the organic light-emitting diode display device is a self-luminescent display device that emits light by itself
Data Source
AI summary
Disclosed an organic light-emitting diode display device in which the number of signal lines is minimized by sharing a predetermined signal line between adjacent pixels in a display panel having a plurality of signal lines formed therein, thereby improving an aperture ratio. The organic light-emitting diode display device includes a display panel defining pixels, a gate driver, a data driver, a multiplexer (MUX) electrically connecting an output terminal of the data driver and the pixels into a 1:1, 1:N (N is a natural number) or N:N structure, and a timing controller. Accordingly, the MUX is provided between the data driver and the pixels, and each pixel and signal lines are selectively connected through the MUX, so that it is possible to reduce the number of Integrated chips (ICs) provided by allowing a compensation circuit built in the data driver.