OLED Pixel Group Subframe Control for VTDC Artifact Reduction
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Solution Overview
Problem
Conventional time division controlled (TDC) driving modes in OLED displays, particularly vertical TDC (VTDC), suffer from artifacts caused by time differences, leading to specific pattern color separation and interlaced operation artifacts.
Innovation Solution
The implementation of a display device and driving method that includes a pixel group with four light-emitting elements, each coupled to a pixel circuit, using sub-frame control signals to manage the emission of these elements, reducing artifacts by synchronized data and scan signal delivery through separate sub-light-emission control lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If vertical time division controlled (VTDC) driving mode is used to reduce transistor integration, then device complexity is reduced, but artifacts and color separation occur due to time differences in light emission
Solution Approach 1:
The pixel group is divided into four light emitting elements (first, second, third, and fourth) that are selectively controlled through separate sub-light-emission control signals. This segmentation allows independent timing control of each element, resolving the artifact issue while maintaining the reduced transistor integration benefit of VTDC mode.
Solution Approach 2:
The patent implements dynamic control by introducing subframe periods (first subframe and second subframe) with distinct sub-light-emission control signals for different light emitting elements. This dynamic, time-division approach enables precise control over when each element emits light, eliminating the static timing issues that cause artifacts in conventional VTDC modes.
2Device complexity
If conventional TDC driving is used to share horizontal driving circuit, then transistor integration is reduced, but color separation occurs in specific pattern
Solution Approach 1:
The pixel group is segmented into four distinct light emitting elements with separate control pathways. Each element receives dedicated sub-light-emission control signals, allowing independent timing control that prevents the color separation artifacts observed in conventional shared-horizontal-circuit TDC modes.
3Productivity
If interlaced operation is used in VTDC to drive two pixels with single circuit, then productivity increases, but artifacts appear due to time difference
Solution Approach 1:
The patent implements dynamic time-division control by dividing the frame into subframes and further into sub-periods, with each light emitting element controlled by specific sub-light-emission control signals. This dynamic approach maintains high productivity through interlaced operation while eliminating artifacts by precisely synchronizing the emission timing of each element.
Solution Approach 2:
The patent employs periodic subframe structure with alternating first and second subframes, where different combinations of light emitting elements are activated in each subframe. This periodic action pattern enables efficient interlaced operation while maintaining synchronized emission timing that prevents artifact formation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively prevents artifacts in the VTDC driving scheme by ensuring synchronized and controlled light emission across the pixel group, enhancing display quality by minimizing the impact of time differences.
Implementation Method 1
displays images using OLEDs that generate light through recombination of electrons and holes
Data Source
AI summary
Artifacts in a specific pattern due to a time difference in a VTDC driving scheme may be prevented. A display device includes: a display including a first pixel circuit, a second pixel circuit, and a pixel group having a first light emitting element, a second light emitting element, a third light emitting element and a fourth light emitting element arranged in a first direction; and a light emission driver generating a first sub-light-emission control signal for controlling emission of the first light emitting element and a second sub-light-emission control signal for controlling emission of the second light emitting element in a first subframe, and generating a third sub-light-emission control signal for controlling emission of the third light emitting element and a fourth sub-light-emission control signal for controlling emission of the fourth light emitting element in a second subframe.