Emission Driver Protection Switching Element Prevents Image Flashing
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Solution Overview
Problem
Display panels experience unintended emission signals during the initial driving period or abnormal off situations, leading to image flashing, which degrades the display quality.
Innovation Solution
The emission driver incorporates a stage with a protection switching element that applies the first gate power voltage to the pull-down switching element in response to a protection signal, preventing simultaneous turn-on of pull-up and pull-down switching elements, thereby preventing image flashing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the emission driver operates during the initial driving period or abnormal off situation, then the display apparatus can be turned on or off, but unintended emission signals are applied to the display panel causing image flashing
Solution Approach 1:
The patent applies preliminary action by introducing a protection switching element that is activated in advance during the initial driving period and abnormal off situations. This element preemptively blocks unintended emission signals before they can reach the display panel, preventing image flashing before it occurs. The protection signal is generated ahead of time to ensure the switching element is ready to block harmful signals during critical transition periods.
Solution Approach 2:
The protection switching element acts as an intermediary between the emission driver and the display panel. It mediates the emission signals by selectively blocking them during the initial driving period and abnormal off situations, while allowing normal emission signals to pass through during stable operation. This intermediary component isolates the display panel from harmful unintended emission signals without affecting normal display functionality.
2Power
If the pull-up and pull-down switching elements are simultaneously turned on, then the emission driver can provide strong drive capability, but a short circuit occurs between first gate power voltage and second gate power voltage
Solution Approach 1:
The patent implements feedback control through the protection switching element that monitors the states of the pull-up and pull-down switching elements. When the protection switching element detects that both switching elements are simultaneously turned on, it activates to block the emission signal, preventing the short circuit between first gate power voltage and second gate power voltage. This feedback mechanism ensures that the drive capability is maintained during normal operation while preventing harmful short circuits during transition periods.
Data Source
AI summary
An emission driver includes a plurality of stages. A stage of the plurality of stages receives a start signal, a first clock signal, a second clock signal, a protection signal, a first gate power voltage and a second gate power voltage and outputs an emission signal. The stage of the plurality of stages includes a pull-up switching element connected between a first gate power voltage terminal which receives the first gate power voltage and an emission signal output terminal which outputs the emission signal, a pull-down switching element connected between a second gate power voltage terminal which receives the second gate power voltage and the emission signal output terminal and a protection switching element which applies the first gate power voltage to a control electrode of the pull-down switching element in response to the protection signal.