Pixel-Integrated Demultiplexing for Low-Power Narrow-Bezel Displays
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Solution Overview
Problem
Existing display technologies face challenges in reducing production costs and power consumption while minimizing the non-display area by integrating a demultiplexer within the data driver, which increases power consumption and space requirements.
Innovation Solution
The integration of demultiplexer functions into the pixels by using transistors with different conductivity types and shared control signals to enable time-divisional data voltage reception, reducing the need for a separate demultiplexer and optimizing scan and emission drivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a demultiplexer is located between a data driver and pixels, then production cost is reduced by decreasing the size of the data driver, but power consumption is increased and non-display area is increased
Solution Approach 1:
The patent merges the demultiplexer function with the pixel structure by adding additional transistors to each pixel. This integration eliminates the need for a separate demultiplexer component, thereby reducing overall device complexity and production cost while avoiding the power consumption penalty of a dedicated demultiplexer circuit.
Solution Approach 2:
The pixel structure is enhanced to perform multiple functions: it serves as both the display element and the demultiplexer. The additional transistors in each pixel enable the pixel to receive and route multiple data voltages, making the pixel universal in function and eliminating the need for separate routing components.
2Device complexity
If a demultiplexer is located between a data driver and pixels, then production cost is reduced by decreasing the size of the data driver, but non-display area is increased to provide space for the demultiplexer
Solution Approach 1:
The demultiplexer function is merged into the pixel structure itself, eliminating the need for separate demultiplexer components that would occupy additional non-display area. The additional transistors are integrated within the pixel, so no extra space is required.
Solution Approach 2:
The patent utilizes the vertical dimension within the pixel structure by adding transistors in series, rather than requiring additional horizontal or lateral space. This allows the demultiplexer function to be implemented within the existing pixel footprint without increasing the non-display area.
3Use of energy by moving object
If demultiplexer functions are implemented in pixels using transistors with different conductivity types, then power consumption is reduced and non-display area is minimized, but device complexity increases
Solution Approach 1:
The patent applies different conductivity types (n-type and p-type) to specific transistors within the pixel structure. This local differentiation allows each transistor to be optimized for its specific function, enabling efficient power consumption while maintaining a relatively simple overall structure that leverages standard semiconductor manufacturing processes.
Data Source
AI summary
A display device includes first and second pixels, connected to a same data line. The first pixel includes: a (1-1)th transistor which controls an amount of a first driving current, based on a first data voltage; and a first additional transistor which receives the first data voltage from the data line. The second pixel includes: a (2-1)th transistor which controls an amount of a second driving current, based on a second data voltage; a (2-2)th transistor which receives the second data voltage from the data line and receives a (1-1)th scan signal; and a second additional transistor which receives the second data voltage from the data line and is connected in series to the (2-2)th transistor. Gate electrodes of the first and second additional transistors receive a same control signal, and conductivity types of the first and second additional transistors are different from each other.