Pixel Sensing Apparatus Dynamic Full-Scale Range Adjustment

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Solution Overview

Problem

Existing display device technologies face issues with degraded image quality due to variations in pixel characteristics over time or environmental changes, leading to noise-influenced pixel sensing errors, especially during shorter sensing periods.

Innovation Solution

A pixel sensing device with an analog circuit, analog-to-digital converter, and digital processing circuit that adjusts the full-scale range (FSR) of the analog-to-digital converter based on sensing mode, allowing for noise minimization during short periods and improved accuracy during longer periods by varying the sensing current and voltage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If pixel sensing is performed during V-Blank section (short time), then panel driving continuity is maintained, but noise influence increases and sensing accuracy degrades

Engineering Contradiction:

Improvepanel driving continuityVSAvoidpixel sensing accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent changes the full-scale range parameter of the analog-to-digital converter based on the sensing time section length. During V-Blank section (short time), a larger FSR is used to reduce noise influence and improve sensing accuracy, while during off signal period (long time), a smaller FSR provides higher resolution. This parameter adaptation resolves the contradiction between maintaining driving continuity and ensuring sensing accuracy.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If pixel sensing is performed after off signal (long time), then sensing accuracy improves, but noise influence becomes heavier and pixel deviations increase

Engineering Contradiction:

Improvepixel sensing accuracyVSAvoidnoise influence

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent dynamically adjusts the FSR parameter based on the sensing mode and time section. During off signal period (long sensing time), a smaller FSR is selected to maximize resolution and accuracy. During V-Blank section (short sensing time), a larger FSR is used to minimize noise accumulation. This adaptive parameter change resolves the contradiction between accuracy and noise influence.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If fixed FSR is used in analog-to-digital converter, then device complexity is reduced, but sensing accuracy varies with time section length

Engineering Contradiction:

Improveconverter structure simplicityVSAvoidsensing accuracy consistency

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent implements a dynamic FSR selection mechanism where the analog-to-digital converter adjusts its full-scale range based on the sensing mode (V-Blank section or off signal period). This dynamic adaptation ensures optimal sensing accuracy for each time section length while maintaining relatively simple device architecture through controlled variability rather than multiple fixed converters.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS11475851B2Pixel sensing apparatus and panel driving apparatus

Publication Date: 2022.10.18 LX SEMICON CO LTD

AI summary

The present embodiment relates to a technology for driving a display device, and provides a technology for adjusting the full-scale range (FSR) of an analog-to-digital converter according to a mode when sensing a pixel.