Voltage Drop Compensation for Display Panel Luminance Uniformity
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Solution Overview
Problem
In active matrix flat display devices, voltage drops occur differently across pixels due to resistance and RC delay effects in voltage lines, leading to nonuniform luminance and potential Mura issues, causing power instability and luminance inconsistencies on the screen.
Innovation Solution
A voltage drop compensation system that divides a test image into regions, generates detected luminance values, and calculates compensation values by comparing these values to a target luminance, applying these values to image data to ensure uniform luminance across the screen and compensate for Mura.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If voltage lines transfer driving voltage to pixels across the panel, then pixels can be powered and display images, but voltage drop occurs differently according to pixel positions leading to nonuniform luminance
Solution Approach 1:
The patent applies local quality by dividing the panel into multiple regions and generating different voltage drop compensation values for each region based on their specific luminance characteristics. This allows each region to receive customized compensation tailored to its local voltage drop conditions, thereby achieving uniform luminance across the entire panel while maintaining stable power supply to each pixel.
2Illumination intensity
If driving voltage is provided to pixels through voltage lines, then pixels can operate, but IR drop causes luminance nonuniformity across different panel positions
Solution Approach 1:
The patent segments the panel into multiple regions and processes each region separately by generating specific voltage drop compensation values for each region. This segmentation approach allows the system to manage and compensate for voltage drops in a organized manner, achieving luminance consistency without requiring overly complex global compensation mechanisms.
Solution Approach 2:
The patent performs preliminary action by pre-calculating and storing voltage drop compensation values for each region before actual image display. This allows the compensation data to be ready in advance, enabling the system to apply corrections efficiently during normal operation without adding real-time processing complexity.
3Illumination intensity
If voltage lines are used to supply power to pixels, then display function is achieved, but voltage drop increases with distance from panel driver causing luminance nonuniformity
Solution Approach 1:
The patent addresses the length-related voltage drop by applying local quality compensation - each region receives customized voltage drop compensation values based on its distance from the panel driver and local luminance characteristics. This allows the system to compensate for the cumulative effect of long voltage lines without requiring physical shortening of the lines.
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
The system effectively compensates for voltage drops and Mura, ensuring uniform luminance and improving pixel luminance by applying calculated compensation values to image data, thereby stabilizing power supply and enhancing display quality.
Implementation Method 1
each pixel includes a thin film transistor (TFT) for switching an applied voltage and an electro-optical conversion element for converting an electrical signal into light
Implementation Method 2
The driving voltage may be nonuniformly transferred to the pixels on the panel according to the positions of the pixels by the influence of the resistances, RC delays and so forth of the voltage lines
Implementation Method 3
The driving voltage may be nonuniformly transferred to the pixels on the panel according to the positions of the pixels by the influence of the resistances, RC delays and so forth of the voltage lines
Data Source
AI summary
A voltage drop compensation system and a display driving device for compensating for a voltage drop of a display panel. The voltage drop compensation system generates a voltage drop compensation value for each of a plurality of regions into which a test image of a panel is divided, and the display driving device compensates for a voltage drop for each region of image data using the voltage drop compensation value.