Scan Line Discharge Control for Self-Emitting Display Afterimage Prevention
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Solution Overview
Problem
Self-emitting display apparatuses face issues with discharge efficiency and manufacturing costs due to turn-on errors in light emitting elements, leading to afterimages caused by parasitic charges and short-circuits, which existing methods fail to adequately address.
Innovation Solution
An image display apparatus with a discharger that performs time-division control of scan lines through a single discharge line, using a reverse-flow preventer, stabilizer, and switch to manage parasitic charges and adjust duty-on time based on short-circuit occurrence, integrated with a controller to optimize discharge operations and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resistance or zener diode is connected to scan line all the time to discharge parasitic charges, then discharge operation is maintained, but power consumption increases
Solution Approach 1:
The patent applies periodic action by controlling the discharge operation to occur only during specific time periods when scan lines need discharge, rather than maintaining continuous discharge. The controller activates discharge transistors selectively based on the scanning timing, enabling discharge only when parasitic charges accumulate to problematic levels, thus reducing unnecessary power consumption while maintaining reliable discharge operation when needed.
2Reliability
If discharge operation is performed continuously to prevent afterimage, then afterimage problem is solved, but manufacturing cost and complexity increase
Solution Approach 1:
The patent segments the discharge operation into independent controllable units by providing separate discharge transistors for different scan lines and display areas. This segmentation allows selective discharge of only those scan lines or areas that require it, rather than implementing a complex continuous discharge system across the entire display, thereby reducing overall device complexity while effectively preventing afterimages.
Solution Approach 2:
The patent implements preliminary action by performing discharge operations in advance before parasitic charges can cause visible afterimages. The controller proactively activates discharge transistors at predetermined timing intervals during the scanning process, preventing afterimage formation before it occurs, rather than reacting after the problem manifests, thus simplifying the overall system design.
3Reliability
If multiple discharge lines are used to discharge all scan lines, then discharge coverage is complete, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies universality by designing a discharge system where a single discharge line can serve multiple scan lines through time-division multiplexing. The discharge transistor connected to a discharge line can sequentially discharge different scan lines at different time periods, allowing one discharge line to perform the function of multiple discharge lines, thereby reducing device complexity and manufacturing costs while maintaining complete discharge coverage.
Data Source
AI summary
An image display apparatus and a method for driving the same are provided. The image display apparatus includes a display panel including a light emitting element formed in a pixel area defined by intersection of a plurality of scan lines and a plurality of data lines, the display panel being configured to display an image by controlling the light emitting element, a discharger configured to perform a discharge operation of the plurality of scan lines by time-division control with respect to a discharge line connected to the plurality of scan lines in the number less than the plurality of scan lines, and a controller configured to control the light emitting element and the discharger.