Low Power DisplayPort Interface Data Rate and Voltage Adjustment

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Solution Overview

Problem

Existing DisplayPort technologies are inefficient in power consumption and prone to electromagnetic interference, particularly in high density form factor designs, due to limited data rates and signaling amplitudes, which affect user experience and device compactness.

Innovation Solution

The implementation of Low Power DisplayPort (LPDP) technology, which adjusts data rates and signaling voltages to minimize power consumption and electromagnetic interference, enabling efficient operation in high density form factors by negotiating component capabilities and exchanging parameters to optimize data transfer and reduce noise emissions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If traditional DisplayPort technology is used to ensure data transfer capability, then display quality is maintained, but power consumption increases and electromagnetic interference occurs

Engineering Contradiction:

Improvepower consumptionVSAvoiddata transfer capability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent implements dynamic adjustment of data rates and signaling voltages based on actual display requirements. The system negotiates between source and sink components to determine optimal operating parameters, allowing the interface to adapt its power consumption and signal strength dynamically rather than operating at fixed high levels continuously.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes key operational parameters including data rates (supporting multiple rates from 1.92 Gbps to 8.64 Gbps) and signaling voltages (reducing amplitude for lower power consumption). These parameter adjustments enable the system to maintain display quality while reducing power consumption and electromagnetic interference by operating at the minimum necessary levels.

Inventive Principle:

Principle #35Parameter changes

2Speed

If high data rates and signaling amplitudes are used to ensure display quality, then visual output performance is improved, but electromagnetic interference increases

Engineering Contradiction:

Improvedata rateVSAvoidelectromagnetic interference

Core Design Contradiction:

SpeedVSObject-generated harmful factors

Solution Approach 1:

The patent reduces signaling voltage amplitudes while maintaining data integrity through optimized equalization and training sequences. By adjusting the voltage amplitude parameter to lower levels and compensating through signal processing techniques, the system achieves the same data transfer reliability with reduced electromagnetic radiation.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent converts the potential harm of high-speed signaling by implementing equalization techniques that compensate for signal degradation. The system uses training sequences and channel equalization to maintain data integrity even at reduced voltage levels, effectively converting the limitation of lower amplitudes into an opportunity for reduced electromagnetic interference.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Volume of moving object

If DisplayPort technology is adapted for high density form factor designs, then device compactness is improved, but power consumption and electromagnetic interference worsen

Engineering Contradiction:

Improvedevice form factorVSAvoidpower consumption

Core Design Contradiction:

Volume of moving objectVSUse of energy by stationary object

Solution Approach 1:

The patent implements dynamic parameter negotiation between source and sink components to optimize power consumption based on actual operational needs. The system adjusts data rates and voltage levels dynamically, allowing compact devices to consume only the necessary power for their specific display requirements rather than operating at fixed high-power levels.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent enables compact form factor designs by supporting a range of data rates (1.92 Gbps to 8.64 Gbps) and voltage amplitudes. This parameter flexibility allows the same interface technology to serve both compact low-power devices and high-performance applications, with the system selecting appropriate parameters based on device size and power constraints.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS8831161B2Methods and apparatus for low power audio visual interface interoperability

Publication Date: 2014.09.09 APPLE INC

AI summary

Methods and apparatus for adjusting the operation of a display device so as to be at least within prescribed form factor or other constraints. In one embodiment of the invention, various operational parameters for a display element are adjusted based on considerations specific to high density form factor constraints. For example, in one such device, a Low Power DisplayPort (LPDP) device having a LPDP source and sink adjust the data rate of the visual data to minimize power consumption while still properly supporting display panel resolutions. In some embodiments, the LPDP source and sink may adjust the transceiver voltages to minimize power consumption. In an alternate embodiment, an LPDP device adjusts data rates to minimize the effects of platform noise. In another aspect of the invention, various display elements of a device coordinate quiescent (“quiet”) mode operation during periods of inactivity.