Power Supply for Touch Display Using Shared Converters

Solution Overview

Problem

The existing touch display devices require a large number of circuit blocks to operate in both normal and sleep modes, leading to increased manufacturing processes, costs, and signal delays that deteriorate touch performance due to the complexity of signal transmission between circuit blocks.

Innovation Solution

A touch display device configuration that includes a power supply with a first and second converter, switching units, and a switching control circuit to supply driving voltages for both display and touch operations, allowing the same converters to be used in both modes, thereby simplifying the circuit configuration and reducing power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If separate circuit blocks are provided for normal mode and sleep mode operations, then the touch display device can operate in both modes with dedicated circuits, but the number of circuit blocks increases leading to complex signal transmission and power consumption

Engineering Contradiction:

Improvemode operation capabilityVSAvoidcircuit block quantity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies universality by designing a single circuit block that can perform both normal mode and sleep mode operations. The touch sensor drive circuit and signal processing circuits are configured to handle different operating modes through control signals, eliminating the need for separate dedicated circuits for each mode. This multi-functional design reduces the overall number of circuit blocks while maintaining full operational capability across different modes.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If separate circuit blocks are provided for normal mode and sleep mode operations, then the touch display device can operate in both modes with dedicated circuits, but the signal transmission between circuit blocks becomes complicated causing signal delay and deteriorated touch performance

Engineering Contradiction:

Improvemode operation capabilityVSAvoidsignal transmission delay

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent merges previously separate circuit blocks into a unified circuit architecture. The touch sensor drive circuit, signal processing circuits, and control circuits are integrated such that signals can be processed within the same circuit block regardless of operating mode. This consolidation reduces the number of inter-circuit signal transmissions, minimizes signal delay, and improves touch response performance while maintaining both normal and sleep mode functionality.

Inventive Principle:

Principle #5Merging (Combining)

3Adaptability or versatility

If separate circuit blocks are provided for normal mode and sleep mode operations, then the touch display device can operate in both modes with dedicated circuits, but the number of manufacturing processes and costs increase

Engineering Contradiction:

Improvemode operation capabilityVSAvoidmanufacturing process quantity

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent applies universality by designing a single circuit block that can perform both normal mode and sleep mode operations. The touch sensor drive circuit and signal processing circuits are configured to handle different operating modes through control signals, eliminating the need for separate dedicated circuits for each mode. This multi-functional design reduces the overall number of circuit blocks while maintaining full operational capability across different modes.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11635841B1Power supply and touch display device including the same

Publication Date: 2023.04.25 LG DISPLAY CO LTD

AI summary

A touch display device operates between a normal mode and a sleep mode, the touch display device including: a display panel; a touch panel; a data drive circuit to supply a data voltage; a touch drive circuit to supply a touch driving signal; a timing controller to supply a data control signal; a micro-control unit to supply a touch synchronization signal; and a power supply to supply a first and second driving voltage, the power supply including: a first converter to output the first driving voltage; a second converter to output the second driving voltage; a first switching unit to supply the first or second input voltage to the first converter; a second switching unit to supply the first or second input voltage to the second converter; and a switching control circuit to control the first and second switching units. Therefore, power consumption of the power supply is reduced.