OLED Sensing Circuit Scaling Merging

Solution Overview

Problem

The existing OLED display devices have a large sensing circuit size due to multiple sampling and holding portions and scaling portions at each data driver, leading to increased parasitic capacitance and errors in scaling voltages, which compromises operation reliability and display quality.

Innovation Solution

A sensing circuit with a single scaler connected to multiple sampling and holding circuits, utilizing an OPAMP as a current integrator to minimize parasitic capacitance effects, thereby reducing the size of the sensing circuit and data driver while enhancing accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If multiple sampling and holding portions and scaling portions are provided at each data driver, then sensing capability is improved, but the size of the sensing circuit increases and operation reliability deteriorates due to increased parasitic capacitance

Engineering Contradiction:

Improvesensing capabilityVSAvoidoperation reliability

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent merges multiple scaling portions into a single shared scaling portion that serves multiple sampling and holding circuits. This consolidation reduces the total number of scaling circuits from multiple per data driver to just one shared circuit, thereby reducing parasitic capacitance and improving operation reliability while preserving the sensing capability of multiple sampling circuits.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The shared scaling portion is designed to serve multiple sampling and holding circuits simultaneously, making it a universal component that performs the scaling function for all sampling circuits rather than having dedicated scaling circuits for each sampling circuit. This multi-functional approach reduces circuit size and parasitic effects.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Measurement precision

If multiple sampling and holding portions and scaling portions are provided at each data driver, then sensing capability is improved, but the size of the sensing circuit and data driver increases

Engineering Contradiction:

Improvesensing capabilityVSAvoidsize of sensing circuit

Core Design Contradiction:

Measurement precisionVSArea of stationary object

Solution Approach 1:

The patent merges multiple scaling portions into a single shared scaling portion that serves multiple sampling and holding circuits. This consolidation reduces the total number of scaling circuits from multiple per data driver to just one shared circuit, thereby reducing parasitic capacitance and improving operation reliability while preserving the sensing capability of multiple sampling circuits.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The shared scaling portion is designed to serve multiple sampling and holding circuits simultaneously, making it a universal component that performs the scaling function for all sampling circuits rather than having dedicated scaling circuits for each sampling circuit. This multi-functional approach reduces circuit size and parasitic effects.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS9870737B2Sensing circuit and organic light emitting diode display device having the same

Publication Date: 2018.01.16 LG DISPLAY CO LTD

AI summary

A sensing circuit capable of simplifying a configuration of a data driver by reducing a size of a sensing circuit provided at each data driver, and an organic light emitting diode (OLED) display device having the same are provided. The sensing circuit includes N sampling and holding circuits, a scaler and an analog-digital converter.