Pixel Scan Signal Overlap for High-Frequency Display Driving
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Solution Overview
Problem
Display devices face challenges in high-frequency driving due to insufficient time for data signal writing in pixels with high resolution, leading to inefficiencies in scan signal application.
Innovation Solution
A display device design that includes a display panel with pixels connected to different data lines and utilizes scan signals with overlapping pulse widths greater than one horizontal time, allowing for efficient data signal transfer and high-frequency operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If scan signals are sequentially applied to pixels at high frequency, then display device can achieve high-frequency driving, but data signal writing time in each pixel becomes insufficient
Solution Approach 1:
The patent applies preliminary action by having the second scan signal start before the first scan signal ends, creating an overlapping timing pattern. This allows the data signal writing process to begin in advance for the next pixel while the current pixel is still being scanned, thereby increasing the effective writing time without reducing the driving frequency. The gate driver generates scan signals with pulse widths greater than one horizontal time to enable this overlapping operation.
2Manufacturing precision
If first scan signal and second scan signal are applied sequentially without overlap, then data signal can be written fully in each pixel, but one horizontal time becomes insufficient for high resolution and high-frequency driving
Solution Approach 1:
The patent merges the scan signal application process with the data signal writing process by making them overlap in time. The first scan signal and second scan signal are applied with temporal overlap, allowing both pixels to be scanned simultaneously while their respective data signals are written during the overlapping period. This combining of operations enables high-resolution driving within the same horizontal time frame.
3Loss of time
If scan signal pulse width is increased beyond one horizontal time, then data signal can be written more completely, but scan signal application time increases
Solution Approach 1:
The patent employs periodic action through the sequential application of multiple scan signals with overlapping pulse widths. The gate driver generates a first scan signal with a first pulse width greater than one horizontal time, followed by a second scan signal with a second pulse width greater than one horizontal time, creating a periodic overlapping pattern. This allows data signals to be written completely while maintaining efficient horizontal time utilization through the rhythmic alternation and overlap of scan signals.
Data Source
AI summary
A display device includes a display panel including pixels in one pixel column and a gate driver for sequentially providing scan signals to the pixels. Each of the pixels includes a light emitting element, a first transistor for controlling a current amount of driving current flowing through the light emitting element and a second transistor for transferring a data signal to a gate electrode of the first transistor in response to a corresponding scan signal among the scan signals. A first pixel among the pixels is electrically connected to a first data line, and a second pixel adjacent to the first pixel among the pixels is electrically connected to a second data line different from the first data line. A second scan signal provided to the second pixel partially overlaps with a first scan signal provided to the first pixel.