Emission Control Driver for Organic Light Emitting Display Luminance
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Solution Overview
Problem
Conventional organic light emitting display devices face complexity in adjusting luminance due to the need for intricate processes in controlling the number of data bits, which affects the emission control of pixels in response to external light conditions.
Innovation Solution
An emission control driver with multiple stages, each driven by specific clock signals, allows for the adjustment of emission control signal width by controlling the supply times of start signals, enabling flexible luminance control through the emission control driver and organic light emitting display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of data bits is adjusted to control luminance, then luminance control is achieved, but the process becomes complicated
Solution Approach 1:
The patent changes the control parameter from data bit number to emission control signal width. By varying the width (duration) of the emission control signal applied to the emission control line, the luminance of the display device is directly controlled. This parameter change simplifies the control mechanism while achieving the same luminance adjustment effect.
Solution Approach 2:
The invention extracts the luminance control function from the data signal path and places it in the emission control signal path. By separating the data transmission function from the luminance control function, the data driver remains simple while the emission control driver handles all luminance adjustments through signal width modulation.
2Device complexity
If emission control signal width is controlled to adjust luminance, then luminance control is simplified, but multiple clock signals are required
Solution Approach 1:
The emission control driver is divided into multiple stages, with odd-numbered stages and even-numbered stages receiving different clock signals (first, second, third, and fourth clock signals respectively). This segmentation allows independent control of signal width in different stages, enabling precise luminance control while distributing the clock signal complexity across multiple dedicated channels.
Solution Approach 2:
Multiple clock signals are used to drive different stages of the emission control driver, allowing the system to generate emission control signals of various widths through a unified multi-stage architecture. Each clock signal serves a specific stage but collectively they enable universal luminance control across the entire display.
Data Source
AI summary
An emission control driver includes a plurality of stages, each of the plurality of stages including a first driver for outputting a first output signal corresponding to one of the first output signal output from a previous stage or a first start pulse; a second driver for outputting a second output signal corresponding to one of the second output signal output from the previous stage or a second start pulse; and a third driver for receiving the first and second output signals and for outputting an emission control signal.