Display Device Signal Line Potential Equalization
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Solution Overview
Problem
Display devices using the active matrix method often generate streak defects or unevenness due to the display operation immediately after a stop period, affecting image quality.
Innovation Solution
A display device with a display area of aligned pixels, scan lines, and signal lines, where a display control unit alternately repeats display and stop periods, setting all signal lines to a predetermined potential during a stop period and providing previously written display data to the signal lines in the latter term of the stop period to equalize potential changes, thereby reducing streak defects and unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the display operation is performed immediately after the stop period, then the display device can quickly resume normal display function, but streak defects or unevenness are generated in the image
Solution Approach 1:
The patent applies preliminary action by performing potential equalization of signal lines during the stop period before the next display operation begins. The display control unit equalizes the potential of all signal lines to a predetermined potential during the stop period, so that when display operation resumes, the potential differences are already eliminated, preventing streak defects without delaying the display operation.
2Manufacturing precision
If the display control unit waits for potential equalization before resuming display operation, then streak defects are suppressed, but the stop period is extended
Solution Approach 1:
The patent applies continuity of useful action by utilizing the stop period to perform potential equalization of signal lines, which is a necessary preparatory action for the next display operation. By continuing this useful action during the stop period rather than waiting for it to complete naturally after display resumes, the system maintains continuous progress toward preventing streak defects without extending the overall stop period.
Data Source
AI summary
According to an aspect, a display device includes: a plurality of pixels aligned in row and column directions, each of the pixels including a drive element; a plurality of scan lines each coupled with the drive elements included in the pixels aligned in the row direction to transmit thereto a scan signal for selecting the pixels row by row; a plurality of signal lines each coupled with the drive elements included in the pixels aligned in the column direction to write display data; and a display control unit. The display control unit alternately repeats a display period and a stop period. In a latter term of the stop period, display control unit provides the display data written in the respective pixels in a row that has been selected during the display period immediately before the stop period, to the signal lines corresponding to the respective pixels.