Dual-Side Scan Driver Segmentation for Display Signal Uniformity

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Solution Overview

Problem

Existing display apparatuses face challenges in reducing the adverse effects of increased size or load on the display panel, leading to output deviations and luminance issues due to clock load, which affect the uniformity and quality of scan signals across the panel.

Innovation Solution

The implementation of a scan driver with dual stages on opposite sides of the display panel, each stage sharing a scan line and operating on different clock signals, ensures simultaneous output of the same scan signal without output deviation, thereby reducing clock load and enhancing display quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single scan driver is used for the entire display panel, then the device complexity is reduced, but output deviations and luminance issues occur due to increased clock load

Engineering Contradiction:

Improvescan driver structureVSAvoidscan signal uniformity

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The scan driver is divided into multiple independent stages (first-stage scan driver and second-stage scan driver) positioned at opposite sides of the display panel. Each stage independently drives a portion of the scan lines, reducing the clock load on any single driver and eliminating output deviations that would occur with a single centralized driver.

Inventive Principle:

Principle #1Segmentation

2Area of stationary object

If the display panel size is increased, then the display area is expanded, but clock load increases causing output deviations

Engineering Contradiction:

Improvedisplay panel areaVSAvoidscan signal output uniformity

Core Design Contradiction:

Area of stationary objectVSReliability

Solution Approach 1:

For larger display panels, the scan driver function is segmented into multiple stages positioned at different locations. This distributes the clock load across multiple drivers rather than concentrating it in one driver, maintaining signal uniformity even as the display area expands.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of expanding a single driver to cover the entire panel, the solution adds a spatial dimension by positioning multiple driver stages at opposite sides of the panel, driving scan lines from both directions to achieve uniform coverage across the expanded area.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Reliability

If multiple scan drivers are used to reduce clock load, then scan signal uniformity is improved, but device complexity increases

Engineering Contradiction:

Improvescan signal uniformityVSAvoidscan driver configuration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Multiple scan driver stages are merged into a coordinated system where first-stage and second-stage drivers work together to drive the same scan lines. This combination achieves uniform scan signal output while maintaining a relatively simple overall structure through standardized driver modules.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS11462174B2Plurality of scan driver having shared scan lines and display apparatus including the same

Publication Date: 2022.10.04 LG DISPLAY CO LTD

AI summary

Disclosed herein is a display apparatus including a display panel displaying an image and a scan driver including a one-side stage disposed at one side of the display panel and an other-side stage disposed at the other side of the display panel, wherein each of the one-side stage and the other-side stage includes at least two output terminals, and a first output terminal of the one-side stage and a second output terminal of the other-side stage shares one scan line disposed in the display panel.