OLED Shift Register Circuit for Bezel Area Reduction
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Solution Overview
Problem
Existing OLED displays face challenges in reducing the size of the bezel area due to the complexity of the Gate In Panel (GIP) circuit, which increases the size of the scan driving unit and consequently the bezel size.
Innovation Solution
The implementation of a shift register that applies first scan signals simultaneously to pixels along two adjacent horizontal lines and generates emission control signals for fourth and fifth transistors, allowing for a reduced bezel area by simplifying the circuit configuration and sharing scan and emission control signals across adjacent pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a conventional Gate In Panel (GIP) circuit is used to generate scan signals and emission control signals, then the display function is achieved, but the bezel area increases due to the complex circuit configuration
Solution Approach 1:
The patent merges the functions of generating first scan signals, second scan signals, and emission control signals into a single integrated shift register unit. This consolidation eliminates the need for separate GIP circuits for each signal type, directly reducing the bezel area while maintaining the necessary display functionality through shared signal generation and distribution mechanisms
Solution Approach 2:
The shift register is designed to perform multiple functions: generating first scan signals for initialization, second scan signals for data sampling, and emission control signals for light output timing. This multi-functional approach replaces multiple specialized circuits with a single versatile unit, reducing overall circuit complexity and bezel space requirements
2Area of stationary object
If separate scan drivers and emission control drivers are used to drive pixels, then precise control is achieved, but the dead space in the display increases
Solution Approach 1:
The patent combines separate scan drivers and emission control drivers into a unified shift register architecture that sequentially generates different signal types. This merging eliminates the physical space required for multiple independent driver circuits while maintaining precise control through time-multiplexed signal generation and distribution to respective pixel components
3Speed
If the shift register applies first scan signals simultaneously to two adjacent horizontal lines, then the scanning speed is improved, but the signal distribution complexity increases
Solution Approach 1:
The patent extends the signal distribution from a single horizontal line to two adjacent horizontal lines simultaneously by adding vertical dimensionality to the scan signal routing. This allows parallel processing of multiple pixel rows, improving scanning speed while the systematic extension of the shift register architecture manages the increased distribution complexity through organized signal paths
Data Source
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AI summary
Disclosed is an Organic Light Emitting Diode (OLED) display including pixels (P) and a shift register for driving transistors (DT) arranged in the pixels (P). The shift register applies first scan signals (Scan1) at the same time to pixels (P) arranged along two adjacent horizontal lines. A second scan signal stage applies second scan signals (Scan2) sequentially to pixels (P) arranged along two adjacent horizontal lines. An emission control signal stage generates emission control signals which are to be applied to fourth and fifth transistors (T4, T5).