Emission Driver for Precise Pixel Light Emission Time Control
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Solution Overview
Problem
Existing organic light emitting display devices face challenges in finely controlling the light emission time of pixels, which affects the representation of grayscale values, as different pixels may emit light in response to the same data signal but at varying times.
Innovation Solution
An emission driver is designed with light emission control drivers that generate and shift light emission control signals and carry signals based on clock signals, allowing for precise control of light emission times across pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light emission control signals are generated using conventional methods, then the display device can operate, but the light emission time of pixels cannot be finely controlled, resulting in inconsistent grayscale representation
Solution Approach 1:
The emission driver is divided into multiple light emission control drivers (first, second, third, etc.), each responsible for controlling specific pixels. Each driver includes separate circuits for generating light emission control signals and carry signals, allowing independent and precise control of light emission timing for different pixel groups.
Solution Approach 2:
The emission driver uses dynamic signal generation where carry signals are shifted based on pixel position and timing requirements. The light emission control signals are dynamically adjusted by shifting carry signals through circuit stages, enabling fine control of light emission time varying by one period of a clock signal across different pixels.
2Adaptability or versatility
If pixels emit light in response to the same data signal simultaneously, then the control is simple, but different grayscale values cannot be represented
Solution Approach 1:
The emission driver generates light emission control signals in advance based on pixel position and timing requirements. Carry signals are prepared and shifted before actual light emission occurs, allowing the system to pre-determine the timing for each pixel's light emission to achieve desired grayscale values.
Solution Approach 2:
The emission driver uses a feedback mechanism where carry signals from one stage influence the timing of light emission control signals in subsequent stages. The shifted carry signals provide timing information that feeds back into the control logic, ensuring consistent and precise timing across all pixels for accurate grayscale representation.
Data Source
AI summary
An emission driver includes light emission control drivers electrically connected to light emission control lines, the light emission control drivers including an (n-1)th light emission control driver configured to provide an (n-1)th carry signal, n being an integer greater than or equal to 2, and an (n)th light emission control driver adjacent to the (n-1)th light emission control driver, the (n)th light emission control drive being configured to generate an (n)th light emission control signal for controlling a light emission time of a pixel based on the (n-1)th carry signal, and to generate an (n)th carry signal based on the (n)th light emission control signal.