Light-Emitting Display Compensation for Data-Line Signal Coupling

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Solution Overview

Problem

Conventional display devices suffer from issues such as data voltage fluctuation and luminance deviation due to signal coupling, particularly in deformed display panels, leading to black floating defects in low gradation areas.

Innovation Solution

Incorporation of a compensation circuit and method that applies a compensation signal opposite to the mux signal to stabilize data voltage, using transistors or capacitors to counteract signal coupling effects.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a mux signal is used to apply data voltage to data lines, then data voltage can be transmitted to the display panel, but signal coupling occurs causing data voltage fluctuation and luminance deviation

Engineering Contradiction:

Improvedata voltage transmissionVSAvoiddata voltage stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

A compensation circuit is introduced as an intermediary component between the mux signal and the data line. This circuit includes a transistor with gate electrode connected to the mux signal line and source/drain electrodes connected to the data line, which acts as a mediator to cancel the harmful coupling effect while allowing the data voltage transmission function to continue

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The compensation circuit operates as a feedback mechanism where the mux signal is fed back through the transistor gate to control the transistor's on/off state. When the mux signal is high (turning on the mux switch), the transistor turns off to block coupling; when the mux signal is low (turning off the mux switch), the transistor turns on to compensate for any residual coupling effects

Inventive Principle:

Principle #23Feedback

2Adaptability or versatility

If data voltage is applied to deformed display panel portions, then the display panel can be driven, but luminance deviation occurs between linear and deformed portions

Engineering Contradiction:

Improvedisplay panel drive capabilityVSAvoidluminance uniformity

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The compensation circuit is strategically positioned at specific locations where coupling effects are most pronounced, particularly near the mux switch and in deformed panel regions. By placing the compensation circuit locally at these critical positions, the patent addresses luminance deviations in specific areas without requiring comprehensive modification of the entire display panel

Inventive Principle:

Principle #3Local quality

3Productivity

If mux switch is turned on to apply data voltage, then data can be transmitted, but black floating defect occurs in low gradation areas

Engineering Contradiction:

Improvedata transmissionVSAvoidblack floating defect

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful coupling effect into a beneficial compensation mechanism. The same mux signal that causes the black floating defect is fed back through the transistor gate to control the compensation circuit, which then generates an opposite-phase signal to cancel the harmful effect. The harm is transformed into a useful feedback control mechanism

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS12462762B2Light-emitting display device and driving method thereof

Publication Date: 2025.11.04 LG DISPLAY CO LTD

AI summary

A light-emitting display apparatus includes a display panel configured to display an image, a data driving circuit configured to apply a data voltage to the display panel, and a signal applying circuit configured to apply a data voltage output from a first channel of the data driving circuit to one of at least two data lines disposed on the display panel, in which the signal applying circuit includes a compensation circuit configured to prevent a data voltage increase due to signal coupling when the data voltage output from the first channel is applied to one of the at least two data lines.