Display Panel Oscillation Circuit for Accurate Input Sensing

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Solution Overview

Problem

Existing electronic devices face challenges in efficiently sensing inputs from external devices while maintaining cost-effectiveness, particularly in the integration of oscillation circuits for input detection.

Innovation Solution

The implementation of a simplified oscillation circuit within an electronic device that includes a quartz oscillator with specific electrode configurations and capacitors, utilizing dielectric interposition and ground connections to enhance input sensing capabilities.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional oscillation circuit is used for input sensing, then the sensing function is achieved, but the device cost increases and complexity increases

Engineering Contradiction:

Improveinput sensing capabilityVSAvoidoscillation circuit complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the oscillation circuit functionality with the existing display panel structure by integrating capacitive elements directly into the panel layers. The first and second capacitors are formed using electrode patterns and insulating layers that are part of the display panel's existing architecture, eliminating the need for separate external oscillation circuit components.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The display panel structure serves multiple functions: it displays images and simultaneously functions as the oscillation circuit for input sensing. The electrode patterns and insulating layers of the display panel are dual-purpose, acting as both display elements and capacitive components for the oscillation circuit, thereby reducing overall device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If a conventional oscillation circuit is used for input sensing, then the sensing function is achieved, but the device cost increases

Engineering Contradiction:

Improveinput sensing capabilityVSAvoiddevice cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The oscillation circuit components are merged with the display panel manufacturing process. The capacitor electrodes and insulating layers are created using the same fabrication steps as the display panel, eliminating the need for separate component procurement and assembly, thereby reducing device cost.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of manufacture

If simplified oscillation circuit is implemented, then device cost is reduced, but sensing sensitivity may be compromised

Engineering Contradiction:

Improvedevice costVSAvoidinput detection sensitivity

Core Design Contradiction:

Ease of manufactureVSMeasurement precision

Solution Approach 1:

The patent optimizes the local properties of the capacitive elements by carefully designing the electrode patterns, spacing, and dielectric materials. The first and second capacitors are positioned and dimensioned to achieve optimal capacitance values for accurate input detection, ensuring that the simplified structure does not compromise sensing sensitivity.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent adjusts key parameters such as capacitor capacitance values, electrode dimensions, and dielectric layer thickness to optimize the oscillation circuit's sensing performance. By carefully controlling these parameters, the circuit achieves accurate input detection despite the simplified structure and reduced component count.

Inventive Principle:

Principle #35Parameter changes

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

This configuration reduces costs and improves the sensitivity and accuracy of input detection, enabling efficient bidirectional communication with input devices.

Implementation Method 1

a quartz oscillator connected to the sensor controller and including a first terminal and a second terminal

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Implementation Method 2

The first electrode and the second electrode constitute a first capacitor

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS12535908B2Electronic device

Publication Date: 2026.01.27 SAMSUNG DISPLAY CO LTD

AI summary

An electronic device includes a display panel, an input sensor, and a flexible circuit film that includes a sensor controller that drives the input sensor, and an oscillation circuit. The oscillation circuit includes a quartz oscillator connected to the sensor controller, a first electrode connected to a first terminal of the quartz oscillator, and a second electrode disposed in a different layer from the first electrode and that overlaps the first electrode. The first electrode and the second electrode constitute a first capacitor.