Display Device Precharge Potential Circuit

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Solution Overview

Problem

The increase in resolution and frames per second in display devices leads to a large difference between the target gray-level potential and the potential of the image signal line, causing unintended gray levels to be displayed, and existing solutions like overdrive require increased information input to the image signal line driving circuit, complicating circuit configuration.

Innovation Solution

A display device with a control portion that includes a difference acquiring circuit to calculate the precharge potential based on the gray-level potential, and an image signal line driving circuit that supplies the precharge potential and gray-level potential in sequence, reducing the amount of information needed to be input.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the gray-level potential is applied directly to the image signal line, then the circuit configuration remains simple, but a large difference occurs between the target gray-level potential and the potential of the image signal line, causing incorrect gray level display

Engineering Contradiction:

Improvegray level display accuracyVSAvoidcircuit configuration complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent applies precharge potential to the image signal line before applying the gray-level potential. This preliminary action brings the image signal line potential closer to the target gray-level potential, reducing the potential difference and ensuring accurate gray level display without requiring complex circuit modifications.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes the potential parameter of the image signal line by applying a precharge potential that is different from both the previous potential and the final gray-level potential. This parameter change enables the image signal line to reach the target potential more accurately within the horizontal period.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If the precharge potential and gray-level potential are supplied to the image signal line in succession, then the image signal line potential becomes closer to the gray-level potential, but the amount of information to be input to the image signal line driving circuit increases

Engineering Contradiction:

Improvegray level display accuracyVSAvoidinformation input amount

Core Design Contradiction:

Manufacturing precisionVSLoss of information

Solution Approach 1:

The patent merges the precharge potential calculation function into the image signal line driving circuit itself. By using the gray-level potential value and the previous image signal line potential value that are already available in the driving circuit, the precharge potential is calculated internally without requiring additional external input information.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The image signal line driving circuit performs self-service by calculating the precharge potential using its own internal resources (previous potential value and gray-level potential value). This eliminates the need for external control boards to calculate and input the precharge potential, thereby reducing the information input burden.

Inventive Principle:

Principle #25Self-service

3Productivity

If the resolution and frames per second are increased, then the display performance is improved, but the horizontal period is shortened, causing a larger difference between the target gray-level potential and the image signal line potential

Engineering Contradiction:

Improvedisplay performanceVSAvoidgray level display accuracy

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent applies precharge potential to the image signal line at the beginning of each horizontal period, performing a preliminary action that quickly brings the potential close to the target gray-level potential. This is especially effective when the horizontal period is shortened due to increased resolution and frames per second, as it reduces the time needed for the potential to stabilize.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent counteracts the adverse effect of the shortened horizontal period by applying a precharge potential that opposes the large potential difference that would otherwise occur. This preliminary anti-action prevents the image signal line potential from being too far from the target gray-level potential, maintaining display accuracy despite the reduced time available.

Inventive Principle:

Principle #9Preliminary anti-action

Data Source

PatentUS8648785B2Display device for calculating and supplying a precharge potential

Publication Date: 2014.02.11 PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA

AI summary

Provided is a display device including: a control portion; a display panel including one or more pixel circuits and an image signal line connected to the pixel circuits; and an image signal line driving circuit. The control portion includes a difference acquiring circuit for acquiring difference data between a value of a gray-level potential, which is to be applied to one of the pixel circuits from the image signal line, and a value of a precharge potential based on the gray-level potential. The image signal line driving circuit calculates the precharge potential based on the value of the gray-level potential and the difference data, and supplies the image signal line with the precharge potential and the gray-level potential in sequence.