Scan Driver Stage Circuits for Simultaneous and Interlace Scanning
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Solution Overview
Problem
Conventional organic light emitting displays face challenges in efficiently supplying scan signals to scan lines using either a simultaneous or interlace method, which affects the display's ability to implement advanced imaging techniques like dual view 3D schemes.
Innovation Solution
The development of stage circuits and a scan driver that utilize progressive and simultaneous drivers to control the supply of scan signals to odd-numbered and even-numbered scan lines, using specific control signals and clock signals to manage voltage and transistor states, allowing for simultaneous or progressive signal delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional scan driver supplies scan signals progressively to scan lines, then the circuit structure is simple, but the response speed is slow and it cannot support advanced imaging techniques like dual view 3D schemes
Solution Approach 1:
The scan driver is segmented into multiple independent stage circuits (first stage circuit, second stage circuit, etc.), each capable of independently controlling scan signals for different scan lines. This segmentation enables simultaneous or interlaced scanning of odd and even scan lines, significantly improving response speed while maintaining manageable circuit complexity through modular design
Solution Approach 2:
The stage circuits incorporate dynamic control mechanisms using multiple clock signals (first clock signal, second clock signal, third clock signal) and control signals (first control signal, second control signal, third control signal, fourth control signal) that can dynamically switch between progressive scanning mode and simultaneous/interlaced scanning mode. This dynamic adaptability allows the system to optimize performance for different imaging applications including dual view 3D schemes
2Speed
If a scan driver uses simultaneous or interlace method to supply scan signals, then the response speed improves, but the device complexity increases
Solution Approach 1:
The device is divided into multiple stage circuits with dedicated progressive drivers and simultaneous drivers in each stage. Each stage circuit independently handles specific scan lines, enabling simultaneous or interlaced scanning without requiring a completely complex centralized control structure. This segmentation reduces overall device complexity while achieving high-speed performance
Solution Approach 2:
Each stage circuit is designed with multi-functionality, containing both progressive driver capabilities and simultaneous driver capabilities within the same circuit module. This universal design allows the same hardware structure to perform different scanning modes (progressive, simultaneous, interlaced) by switching control signals, thereby reducing device complexity compared to having separate dedicated circuits for each scanning mode
3Ease of operation
If progressive driver controls voltage to output terminal, then scan signals are supplied progressively, but the coupling cannot be blocked when needed
Solution Approach 1:
The switch control circuit is configured to receive control signals in advance and proactively block or enable coupling between the progressive driver and output terminal before the actual scanning operation. This preliminary action ensures that the coupling state is correctly established before signal transmission begins, preventing signal interference and ensuring reliable operation
Solution Approach 2:
A switch control circuit acts as an intermediary between the progressive driver and the output terminal, mediating the coupling relationship. This intermediary component provides precise control over signal transmission, allowing the system to reliably block or enable coupling based on control signals, thereby ensuring both operational flexibility and signal control reliability
4Productivity
If simultaneous driver outputs scan signals with non-overlapping control signals, then simultaneous scanning is achieved, but the control signal complexity increases
Solution Approach 1:
The control signals for the simultaneous driver are segmented into distinct non-overlapping time periods, with each control signal (first control signal, second control signal, fourth control signal) assigned to specific time windows. This temporal segmentation allows simultaneous scanning of multiple scan lines while keeping control signal complexity manageable through structured time-multiplexed control
Solution Approach 2:
The simultaneous driver employs periodic action by cycling through different control signals in a predetermined sequence with non-overlapping time periods. This periodic control pattern enables efficient simultaneous or interlaced scanning of odd and even scan lines while maintaining simple and predictable control signal generation, improving productivity without excessive control complexity
Data Source
AI summary
There are provided stage circuits and a scan driver using the same, which can supply scan signals using a simultaneous method or an interlace method. Each of the stage circuits includes a progressive driver and a simultaneous driver. The progressive driver outputs a scan signal to an output terminal, corresponding to a plurality of clock signals supplied simultaneously or progressively, and the coupling between the progressive driver and the output terminal is blocked when a third control signal is supplied. The simultaneous driver outputs a scan signal to the output terminal, corresponding to first and second control signals which do not overlap each other, and the coupling between the simultaneous driver and the output terminal is blocked when a fourth control signal, which does not overlap the third control signal, is supplied.