LED Display Sub-Pixel Shifting for High Resolution

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Solution Overview

Problem

Conventional display devices employing pixel-shifting technology face challenges in achieving high spatial resolutions due to limitations in pixel count, slow response times, and limited brightness, particularly in inorganic and organic light-emitting diode-based displays.

Innovation Solution

An LED-based display apparatus utilizing a liquid-crystal device with a control circuit to shift light from light-emitting diodes to multiple target positions, enhancing apparent resolution through sub-pixel shifting and time-based spatial multiplexing, while maintaining high brightness and fast switching times.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If pixel-shifting technology is employed to achieve high spatial resolution, then apparent resolution is improved, but pixel count requirements become difficult to meet

Engineering Contradiction:
Improvespatial resolutionVSAvoidpixel count
Core Design Contradiction:
Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent employs dynamic pixel-shifting technology where a single physical pixel can be electronically repositioned to multiple spatial locations over time. The pixel position is dynamically adjusted using sub-pixel addressing and timing control, allowing one pixel to serve multiple spatial roles and achieve high apparent resolution without requiring a correspondingly high physical pixel count.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent introduces temporal dimension to the spatial pixel arrangement by shifting pixel positions across multiple time frames. A single pixel is displayed at different spatial coordinates in different time periods, effectively adding a time dimension to the spatial pixel distribution and achieving super-resolution without increasing physical pixel density.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

2Measurement precision

If pixel-shifting technology is used to increase spatial resolution, then apparent resolution is improved, but response time increases

Engineering Contradiction:
Improvespatial resolutionVSAvoidresponse time
Core Design Contradiction:
Measurement precisionVSLoss of time

Solution Approach 1:

The patent implements periodic pixel-shifting cycles where pixels are systematically repositioned across multiple time periods in a repeating pattern. The shifting follows a predetermined sequence that cycles through different spatial positions, allowing the display to maintain high apparent resolution through rhythmic, periodic repositioning rather than continuous adjustment.

Inventive Principle:
Principle #19Periodic action

Solution Approach 2:

The patent pre-calculates and pre-arranges pixel-shifting sequences in advance, storing the shifting patterns in memory. The display controller retrieves pre-computed shifting instructions for each frame, eliminating the need for real-time calculation and reducing response time. The pixel positions are predetermined based on the display refresh rate and resolution requirements.

Inventive Principle:
Principle #10Preliminary action

3Measurement precision

If a single pixel provides light to multiple positions through pixel-shifting, then apparent resolution is improved, but brightness decreases

Engineering Contradiction:
Improvespatial resolutionVSAvoidbrightness
Core Design Contradiction:
Measurement precisionVSIllumination intensity

Solution Approach 1:

The patent maintains continuous light emission from each physical pixel while it shifts positions over time. Rather than turning pixels on and off during shifting, the pixels emit light continuously throughout the shifting cycle, ensuring that light is always being provided to the current displayed position. This continuous emission compensates for the dilution of light intensity across multiple positions.

Inventive Principle:
Principle #20Continuity of useful action

Solution Approach 2:

The patent uses periodic pixel-shifting with synchronized light emission, where pixels emit light in rhythm with their position changes. The light emission is timed to coincide with the pixel's presence at each spatial location, creating periodic bursts of illumination that maintain perceived brightness despite the pixel serving multiple positions over time.

Inventive Principle:
Principle #19Periodic action

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

The solution significantly increases apparent spatial resolution and overall brightness, enabling the display of high-resolution, high-quality images with improved durability and performance compared to traditional display technologies.

Implementation Method 1

the liquid-crystal structure is to be electrically controlled, via the control circuit, to shift light emanating from a given light-emitting diode to a plurality of target positions on an image plane

Methodology Applied
Scientific EffectLight shifting: Refraction

Data Source

PatentUS11348514B2LED-based display apparatus and method incorporating sub-pixel shifting
Publication Date: 2022.05.31 VARJO TECH OY
  • US11348514B2 patent drawing
  • US11348514B2 patent drawing
  • US11348514B2 patent drawing

AI summary

A display apparatus including: image renderer including light-emitting diodes that are to be employed as sub-pixels of image renderer; liquid-crystal device including liquid-crystal structure and control circuit, wherein liquid-crystal structure is arranged in front of light-emitting diodes of image renderer, wherein liquid-crystal structure is to be electrically controlled, via control circuit, to shift light emanating from light-emitting diode to target positions on image plane according to shifting sequence in repeated manner; and processor(s) configured to render output sequence of output image frames via image renderer, wherein shift in light emanating from light-emitting diode to target positions causes resolution of output image frames to appear higher than display resolution of image renderer.