Scan Driver Emission Control Line Reduction for Display Aperture Ratio
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Solution Overview
Problem
Conventional light emitting displays have a high number of emission control lines, which decreases the aperture ratio and increases power consumption and component count in the scan driver, leading to inefficient use of space and higher power consumption.
Innovation Solution
The proposed solution involves reducing the number of emission control lines by coupling at least two pixels to one emission control line, allowing them to be controlled by a single emission control signal, and using a scan driver with a shift register to generate scan and emission control signals, thereby reducing the number of output lines and components in the scan driver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If emission control lines are connected to pixel rows respectively, then each pixel can be controlled independently, but the number of wiring lines increases, deteriorating the aperture ratio
Solution Approach 1:
The patent merges the control of multiple pixel rows by connecting them to a common emission control line. Specifically, first and second pixel rows are connected to the same emission control line, allowing simultaneous control of multiple rows with a single signal line, thereby reducing the total number of wiring lines and improving the aperture ratio while maintaining independent control capability through selective signal activation
Solution Approach 2:
The emission control line is designed to serve multiple pixel rows simultaneously. The same emission control line can control both first and second pixel rows, making it a multi-functional line that performs the control function for multiple rows without requiring separate dedicated lines for each row
2Adaptability or versatility
If the scan driver outputs emission control signals to multiple emission control lines, then all pixel rows can be controlled, but the number of output lines increases, increasing power consumption and component count
Solution Approach 1:
The scan driver merges its output functionality by using fewer output lines to control multiple emission control lines. The scan driver outputs emission control signals to a reduced number of lines that then distribute signals to multiple pixel rows, thereby reducing the total number of output lines, decreasing power consumption, and reducing component count while maintaining full pixel row coverage
Solution Approach 2:
The patent introduces an intermediary signaling mechanism where the scan driver outputs signals to a reduced set of emission control lines, which then act as intermediaries to control multiple pixel rows. This intermediary approach allows the scan driver to maintain adaptability for controlling all pixel rows while using fewer direct output lines, thereby reducing power consumption and component requirements
3Adaptability or versatility
If multiple emission control lines are used, then all pixel rows can be controlled simultaneously, but the scan driver size increases, occupying more space
Solution Approach 1:
The scan driver merges its internal structure by reducing the number of output lines and components needed to control multiple pixel rows. By implementing a configuration where fewer output lines control multiple emission control lines, the scan driver achieves full pixel row control capability while minimizing its own physical size and space occupation
Data Source
AI summary
A light emitting display including: a plurality of scan lines adapted to transmit scan signals; a plurality of data lines adapted to transmit a data signal; a plurality of emission control lines adapted to transmit an emission control signal; and a plurality of pixels adapted to emit light in response to the scan signal, the data signal and the emission control signal. At least two pixels receiving the scan signals through different scan lines are connected to one emission control line. With this configuration, a scan driver and a light emitting display including the same have a decreased number of wiring lines provided in a pixel portion, thereby enhancing an aperture ratio, decreasing the number of emission control signals, decreasing the number of components and wiring lines needed for the scan driver, simplifying a fabrication process, and reducing the power consumption of the light emitting display.