Pulse Signal Combination Circuit for OLED Display Panels
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Solution Overview
Problem
Existing OLED display panel technologies face challenges in generating multiple-pulse gate driving signals from single-pulse signals efficiently, leading to complex pixel structures and reduced effective light-emitting areas, especially in large-sized panels.
Innovation Solution
A pulse signal combination circuit that combines multiple single-pulse signals by adding OR units to an existing single-pulse signal generation circuit, allowing for multiple-pulse output without losses, thereby simplifying the pixel structure and enhancing the effective light-emitting area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single unit circuit is used to generate multiple-pulse gate driving signals based on single-pulse principles, then the circuit structure remains simple, but it is very difficult to generate the multiple-pulse gate driving signal
Solution Approach 1:
The circuit is divided into multiple independent output control units (first output control unit, second output control unit, third output control unit, etc.), each responsible for controlling a specific output electrode. Each unit includes transistors that can independently respond to different single-pulse signals and control corresponding sub-pixel elements, enabling the circuit to generate multiple-pulse signals without increasing overall structural complexity.
2Device complexity
If more thin film transistors are required to drive pixels in large-sized OLED display panels, then the pixel structure becomes complex, but the effective light-emitting area is reduced
Solution Approach 1:
The output control units are designed with multi-functional transistors that can serve multiple purposes. For example, the first transistor in each output control unit can respond to different single-pulse signals at different times and control different sub-pixel elements, making a single transistor perform multiple functions that would otherwise require separate transistors, thereby reducing the total number of TFTs and increasing the effective light-emitting area.
3Adaptability or versatility
If single-pulse signals are combined into multiple-pulse signals using traditional methods, then signal combination is achieved, but signal losses occur
Solution Approach 1:
The output control units utilize the inherent timing characteristics and voltage levels of the input single-pulse signals to automatically generate the appropriate multiple-pulse output signals. The transistors in each output control unit respond directly to the timing and voltage of incoming single-pulse signals without requiring additional signal conditioning or conversion circuits, thereby combining signals without loss while maintaining signal integrity.
Data Source
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AI summary
Disclosed is a pulse signal combination circuit, a display panel and a display device. The pulse signal combination circuit is configured to combine N input pulse signals which are sequentially effective within each display period into an output pulse signal, and N is an integer greater than 1. The pulse signal combination circuit includes N output control units and a pulse signal output end. A first control end of an nth output control unit is configured to receive an nth input pulse signal, a second control end thereof is configured to receive an (n+1)th input pulse signal, and an output end thereof is connected to the pulse signal output end. The nth output control unit is configured to, within a time duration of each display period after the nth input pulse signal is effective for the first time and before the (n+1)th input pulse signal is effective for the first time, output the nth input pulse signal to the pulse signal output end, where n is a positive integer less than N.