Light Emitting Device Driving Circuit Signal Write Operation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing light emitting devices face delays in starting image display due to unstable gate potentials in driving transistors, leading to issues like bright lines or artifacts during powering-on.
Innovation Solution
A light emitting device with a driving circuit that performs a signal write operation of writing a predetermined signal in the gates of driving transistors before starting write scanning, allowing for simultaneous writing across multiple rows without row scanning, thereby reducing the time to initiate image display while maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If write scanning is performed for one frame during the period from powering-on to the start of image display, then image quality is maintained, but the time required to start image display increases
Solution Approach 1:
The patent applies preliminary action by writing a predetermined signal to the gates of driving transistors in multiple rows simultaneously before the start of normal write scanning. This preliminary signal write operation prepares the pixels in advance to be in a non-light emission state, allowing image display to start immediately without waiting for sequential row-by-row scanning to complete, thus reducing the time delay while maintaining image quality.
2Loss of time
If signal write operation is performed collectively in multiple rows without scanning, then the time from activation to image display is shortened, but device complexity increases
Solution Approach 1:
The patent merges the signal write operations for multiple rows into a single simultaneous operation. By combining the control signals for multiple rows and writing the predetermined signal to all selected rows at the same time rather than sequentially, the driving circuit achieves faster initialization without requiring significantly increased complexity, as it uses existing circuit resources in a coordinated manner.
Data Source
AI summary
A light emitting device is provided. The device includes a plurality of pixels, each pixel including a light emitting element and a driving transistor configured to supply a current corresponding to a luminance signal to the light emitting element and a driving circuit including a scanning circuit configured to perform write scanning of scanning the plurality of pixels on a row basis and writing the luminance signal in a gate of the driving transistor. The driving circuit performs, only during a period from an activation of the light emitting device to a start of the write scanning when the write scanning is performed for a first time, a signal write operation of collectively writing a predetermined signal in the gates of the driving transistors included in pixels arranged in not less than two rows among the plurality of pixels.