Shared Shift Registers for Independent Pixel Scanning in OLED Displays
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Solution Overview
Problem
Active matrix type organic EL display apparatuses require a large number of driving signal lines, leading to increased power consumption and a larger circuit framework, which complicates the production and consumption of driving signals, especially when compared to LCD apparatuses.
Innovation Solution
A display apparatus and driving method that utilize shared shift registers for multiple scanner signals with different periods, allowing independent control of pixel circuits through a drive circuit divided into regions, enabling the use of a single set of shift registers for scanning signals with varying periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a large number of driving signal lines are used in active matrix type organic EL display apparatus, then pixel control capability is improved, but power consumption increases and circuit framework size increases
Solution Approach 1:
The patent combines multiple scanner signals with different periods into a single shared shift register system. The drive circuit generates multiple scanner signals (first scanner signal and second scanner signal with different periods) using one set of shift registers, thereby reducing the number of separate driving signal lines needed while maintaining the ability to control different pixel circuits with appropriate timing
Solution Approach 2:
The shift registers are designed to serve multiple functions by generating different types of scanner signals with varying periods. The same shift register circuitry can produce signals for different scanning rates and pixel circuit configurations, making the driving system more versatile without requiring additional dedicated circuits for each signal type
2Adaptability or versatility
If a large number of driving signal lines are used in active matrix type organic EL display apparatus, then pixel control capability is improved, but device complexity increases
Solution Approach 1:
The patent merges the functionality of multiple separate driving signal generation circuits into a single integrated drive circuit. By using one set of shift registers to produce multiple scanner signals with different periods, the circuit framework is simplified and the number of required signal lines is reduced while maintaining comprehensive pixel control capability
3Measurement precision
If multiple scanner signals with different periods are generated separately, then pixel circuit control precision is improved, but production and consumption complexity of driving signals increases
Solution Approach 1:
The shift register system is designed with universal functionality to generate multiple scanner signals with different periods from a single circuit configuration. This multi-functional approach maintains precise control over different pixel circuits while avoiding the need for separate dedicated signal generation circuits for each period requirement
Data Source
AI summary
A display apparatus disclosed herein includes a plurality of pixel circuits each having a plurality of switches configured to receive a driving signal of a predetermined period and be controlled for opening and closing operation by the driving signal; and a drive circuit configured to control the open/closed state of the switches; the drive circuit being operable to scan the pixel circuits and open and close the switches in periods independent of each other.