Light-Emitting Device With Initialization Transistor for Afterimage Suppression
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Solution Overview
Problem
Light-emitting devices using oxide semiconductors face issues with afterimages when displaying different image data after holding image data for a long time, leading to incomplete rewriting and residual images.
Innovation Solution
A light-emitting device configuration including multiple transistors and light-emitting elements, where one transistor is used to control the initialization of the gate electrode potential, ensuring complete erasure of previous image data before new data is input, thereby preventing afterimages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If image data is held in a pixel using an oxide semiconductor transistor, then power consumption is reduced and image data can be maintained, but afterimages occur when different image data is input after long-term holding
Solution Approach 1:
The patent applies preliminary action by initializing the gate electrode potential before new image data is input. The initialization transistor is activated to reset the held charge to a predetermined potential level, ensuring that previous image data is completely erased before new data is written, thus preventing afterimage effects while maintaining the low power consumption benefits of charge holding
2Loss of time
If image data is held for a long time in a pixel, then writing frequency can be reduced and power-saving is achieved, but the original image data cannot be rewritten completely and remains as an afterimage
Solution Approach 1:
The initialization transistor performs a preliminary reset action by setting the gate electrode potential to a predetermined level before new image data is written. This ensures complete erasure of previously held image data, allowing high scan frequencies to be used without afterimage artifacts, thus resolving the contradiction between reduced writing frequency and complete image data rewriting
3Reliability
If a transistor with significantly small off-state current is used, then image data can be held effectively, but afterimages occur when different image data is input after holding
Solution Approach 1:
The initialization transistor acts as an intermediary component that periodically resets the gate electrode potential to a predetermined level. This intermediary action ensures that the charge holding transistor maintains its low off-state current benefits for image data retention, while the initialization transistor periodically clears residual charge that would cause afterimages, thus resolving the contradiction between holding capability and afterimage suppression
Data Source
AI summary
To provide a light-emitting device capable of suppressing the display of an afterimage. A plurality of pixels arranged in n rows and m columns (n and m are each an integer of 2 or more) is supplied with a first signal containing image data and a second signal for initializing the pixels. Each pixel includes a first transistor for controlling the input of the first signal and a second transistor for controlling the input of the second signal. The first transistor in a k-th row (k is an integer of 1 to n) and the second transistor in a k+1-th row are turned on at the same time, so that the pixels are initialized and display images effectively.