Display Control Apparatus Duty Ratio Adjustment for Power and Quality

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Solution Overview

Problem

Current display technologies face challenges in achieving high display quality while reducing power consumption and minimizing degradation over time, particularly in active matrix type displays that use pseudo-impulse driving, which results in lower illuminance and increased power consumption.

Innovation Solution

A display control apparatus that adjusts the duty ratio of light emission to video display time, decreasing the light emission time as the frame rate increases, and switches between hold driving and pseudo-impulse driving based on application requirements and ambient illuminance to optimize display quality and power usage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If pseudo-impulse driving is used to reduce display blur and after-image effects, then display quality is improved, but display illuminance decreases and power consumption increases

Engineering Contradiction:

Improvedisplay qualityVSAvoiddisplay illuminance

Core Design Contradiction:

Manufacturing precisionVSIllumination intensity

Solution Approach 1:

The patent applies dynamics by making the light emission duty ratio adjustable based on frame rate. The system dynamically changes the duty ratio from 100% at lower frame rates to lower percentages at higher frame rates, optimizing both display quality and power consumption according to the specific operating conditions rather than using a fixed driving mode

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the duty ratio parameter according to frame rate. When frame rate increases above a threshold, the duty ratio is reduced from 100% to a lower value, which reduces power consumption and heat generation while maintaining the benefits of pseudo-impulse driving for reducing display blur and after-image effects

Inventive Principle:

Principle #35Parameter changes

2Illumination intensity

If duty ratio is increased to maintain display illuminance in pseudo-impulse driving, then visibility is improved, but power consumption and device degradation increase

Engineering Contradiction:

Improvedisplay illuminanceVSAvoidpower consumption

Core Design Contradiction:

Illumination intensityVSUse of energy by stationary object

Solution Approach 1:

The patent applies partial action by using pseudo-impulse driving with reduced duty ratio only when necessary (at high frame rates above the threshold). At lower frame rates, the system uses hold driving with 100% duty ratio, applying the full light emission action only when the display quality requirements demand it, thereby saving power during normal operation

Inventive Principle:

Principle #16Partial or excessive action

3Illumination intensity

If hold driving is used to maintain continuous light emission, then display illuminance is maintained, but display blur and after-image effects increase

Engineering Contradiction:

Improvedisplay illuminanceVSAvoiddisplay quality

Core Design Contradiction:

Illumination intensityVSManufacturing precision

Solution Approach 1:

The patent makes the driving mode dynamic by switching between hold driving and pseudo-impulse driving based on frame rate. When frame rate exceeds the threshold, the system automatically transitions to pseudo-impulse driving with reduced duty ratio to eliminate display blur and after-image effects, while at lower frame rates it maintains hold driving for continuous illuminance

Inventive Principle:

Principle #15Dynamics

4Manufacturing precision

If frame rate is increased to improve video image quality, then display quality is improved, but power consumption and device degradation increase due to continuous light emission

Engineering Contradiction:

Improvevideo image qualityVSAvoidpower consumption

Core Design Contradiction:

Manufacturing precisionVSUse of energy by stationary object

Solution Approach 1:

The patent changes the duty ratio parameter in response to frame rate changes. When frame rate increases above the threshold, the duty ratio is reduced from 100% to a lower percentage, which reduces power consumption and heat generation while still maintaining the improved video image quality achieved by the higher frame rate

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 approach enhances display quality by reducing blur and after-image effects at high frame rates while minimizing power consumption and extending the lifespan of the display apparatus, and adjusts illuminance based on ambient conditions to prioritize visibility or power efficiency.

Implementation Method 1

current-driven organic electro luminance (EL) elements are widely used as electro-optic elements for forming pixels

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS11189246B2Display control apparatus, display apparatus, non-transitory storage medium, and control method

Publication Date: 2021.11.30 SHARP KK

AI summary

A display control apparatus comprises a host control unit configured to acquire or generate video image data of a video image to be displayed on the display panel; and a display control unit configured to output the video image data transferred from the host control unit to the display panel, the host control unit performing: determining a proper duty ratio of a duty ratio indicating a ratio of a light emission time of the video image to a display time of the video image such that as a frame rate of the video image increases, the ratio of the light emission time of the video image to the display time of the video image decreases; and controlling the display control unit to adjust the duty ratio such that the display panel emits light at the proper duty ratio.