Staggered Emission Timing for Display Pixel Group Boundary Ripple
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Solution Overview
Problem
In light emitting display devices, the use of a driving method where all pixels are grouped and simultaneously emit light results in visible dark lines or bright lines at the boundaries between pixel groups due to ripple phenomena in the high potential voltage.
Innovation Solution
A light emitting display device is designed with a display panel comprising pixel groups where the emission signal timing for adjacent pixel groups is staggered, with the falling time of one emission signal and the rising time of another differing in a first frame, and this timing difference is alternated between frames to prevent boundary visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pixels are grouped and simultaneously emit light in units of pixel groups, then driving efficiency and high luminance are achieved, but dark lines or bright lines become visible at boundaries between pixel groups due to ripple phenomena in high potential voltage
Solution Approach 1:
The patent applies periodic action by alternating the timing of emission signals between different pixel groups in a frame-by-frame manner. In odd frames, the first pixel group emits light first, while in even frames, the second pixel group emits light first. This periodic reversal of emission timing prevents the persistent visibility of dark or bright lines at pixel group boundaries by distributing the ripple effects across different temporal patterns, making them less perceptible to the human eye.
2Speed
If the falling time and rising time of emission signals for neighboring pixel groups are the same point in time, then simultaneous emission is achieved, but ripple occurs in high potential voltage due to crossing of emission signal line and high potential voltage line
Solution Approach 1:
The patent implements dynamics by making the emission timing relationship between pixel groups variable rather than fixed. The timing sequence is dynamically adjusted based on the frame number: in odd frames, the first pixel group's emission signal falls before the second pixel group's emission signal rises; in even frames, this sequence is reversed. This dynamic timing adjustment prevents simultaneous crossing of emission signal lines and high potential voltage lines, thereby eliminating ripple generation while maintaining overall emission synchronization.
Data Source
AI summary
A light emitting display device includes a display panel including a first pixel group including a plurality of pixels in 2N rows. The light emitting display device further includes a second pixel group disposed subsequent to the first pixel group and including a plurality of pixels in 2N rows. The light emitting display device further includes an emission signal unit including a first emission stage for applying the same first emission signal to the first pixel group and a second emission stage for applying the same second emission signal to the second pixel group. In a first frame, a falling time of the first emission signal and a rising time of the second emission signal are different from each other.