Display Port Adapter for LCD Backlight Lifespan Extension

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Solution Overview

Problem

Low-cost LCD panels with embedded DisplayPort interfaces, commonly used in POS and SST terminals, have short LED backlight lifespans, leading to frequent replacements and increased costs due to lack of independent backlight control.

Innovation Solution

A display port apparatus with a programmable sniffer device that intercepts and translates power and sleep mode commands from a primary device to an LCD panel, allowing for intelligent backlight control through an auxiliary channel, extending the LCD panel's lifespan.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If low-cost LCD panels with embedded DisplayPort interfaces are used in POS and SST terminals, then device cost is reduced, but LED backlight lifespan is shortened leading to frequent replacements

Engineering Contradiction:

Improvedevice costVSAvoidLED backlight lifespan

Core Design Contradiction:

Ease of manufactureVSDuration of action of stationary object

Solution Approach 1:

A DisplayPort adapter is introduced as an intermediary device between the host device and the LCD panel. The adapter intercepts DisplayPort communication signals, specifically power management packets (PMP) and auxiliary channel commands, and translates them into backlight control signals that the LCD panel can understand. This mediator enables independent backlight control without modifying the original low-cost LCD panel design, thus maintaining cost effectiveness while extending LED backlight lifespan through intelligent power management.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system changes the control parameters by translating high-level DisplayPort power management commands into specific backlight control signals. The adapter monitors power state transitions (DPCD power management packets) and converts them into appropriate backlight on/off commands, effectively changing how the backlight is controlled from panel-internal autonomous control to externally-managed controlled operation, thereby extending LED lifespan.

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If LCD panels do not independently control their own backlights, then device complexity is reduced, but backlight control capability is lost leading to reduced lifespan

Engineering Contradiction:

Improvebacklight control capabilityVSAvoidLED backlight lifespan

Core Design Contradiction:

Device complexityVSDuration of action of stationary object

Solution Approach 1:

The DisplayPort adapter serves as an external intermediary that compensates for the LCD panel's lack of independent backlight control capability. By intercepting and translating power management signals from the host device, the adapter provides the missing backlight control function without requiring modifications to the LCD panel itself, thus maintaining low device complexity while enabling lifespan extension through controlled operation.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system segments the backlight control function from the LCD panel and relocates it to the DisplayPort adapter. This separation allows the LCD panel to remain simple and cost-effective while the adapter handles the complex power management and backlight control tasks, achieving functional segmentation that resolves the contradiction between simplicity and control capability.

Inventive Principle:

Principle #1Segmentation

3Adaptability or versatility

If additional displays are used as customer displays at POS terminals, then customer service capability is improved, but replacement frequency increases due to LED backlight burnout

Engineering Contradiction:

Improvecustomer service capabilityVSAvoiddisplay replacement frequency

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The DisplayPort adapter acts as a protective intermediary that extends the reliability of additional displays used as customer displays. By implementing intelligent backlight control through signal translation, the adapter prevents premature LED backlight burnout, thereby reducing replacement frequency and maintaining the enhanced customer service capability provided by multiple displays.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system implements feedback control by monitoring power management packets from the host device and adjusting backlight operation accordingly. The adapter continuously receives power state information and translates it into appropriate backlight control actions, creating a feedback loop that optimizes LED backlight usage and extends display reliability in multi-display POS terminal configurations.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS10896647B2Display port apparatus and processing

Publication Date: 2021.01.19 NCR VOYIX CORP

AI summary

A device is interposed between a first device display port and a second device display port. The device passes through signals provided from the first device display port to the second device display port except when predefined signals are detected. For the predefined signals, the device translates the predefined signals received from the first device display port into different signals that are provided to the second device display port.