Display Device Driving Method for Luminance Uniformity and Purple Dot Elimination

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current display panels experience poor compensation effects and display performance due to uneven luminance, particularly resulting in purple dots caused by over-compensation of green subpixels, leading to poor display quality.

Innovation Solution

A display device driving method that determines an abnormal driving parameter and adjusts the compensation value to prevent over-compensation, using a second compensation value smaller than the initial value to eliminate purple dots and ensure uniform luminance across the panel.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If luminance compensation is performed on higher luminance positions of the display panel, then luminance uniformity is improved, but green subpixel luminance drops to zero causing purple dots and poor display performance

Engineering Contradiction:

Improveluminance uniformityVSAvoidpurple dots

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The patent changes the compensation parameter from a single grayscale value to a multi-dimensional parameter set including compensation grayscale, compensation voltage, and compensation coefficient. By adjusting these parameters dynamically based on subpixel characteristics, the compensation achieves luminance uniformity without causing green subpixel luminance to drop to zero, thereby eliminating purple dots while maintaining display quality.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If compensation value is increased to improve luminance uniformity, then display quality is improved, but over-compensation occurs causing purple dots

Engineering Contradiction:

Improveluminance uniformityVSAvoiddisplay performance

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The patent implements a feedback mechanism where the compensation value is dynamically adjusted based on detected abnormal driving parameters and subpixel luminance characteristics. The system monitors the compensation effect and adjusts the compensation grayscale and voltage accordingly, preventing over-compensation that would cause purple dots while ensuring sufficient compensation for luminance uniformity.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

Instead of applying uniform compensation across all pixels, the patent applies partial compensation targeted at specific pixels or regions with abnormal luminance characteristics. By identifying pixels requiring compensation and applying adjusted compensation values only to those areas, the system achieves luminance uniformity without over-compensating normal pixels, thus avoiding purple dots.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS11699381B2Display device, driving method thereof, and electronic device

Publication Date: 2023.07.11 WUHAN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO LTD

AI summary

The application provides a display device and a driving method thereof, and an electronic device. The display device driving method obtains a first driving parameter and a first compensation value of the display device, determines an abnormal driving parameter of the display device based on the first driving parameter and the first compensation value of the display device, then determines a second compensation value of the display device based on the abnormal driving parameter of the display device, and drives the display device using the second compensation value and the first driving parameter.