Pixel Subpixels Dynamic Public Private Mode Switching

Solution Overview

Problem

Display apparatuses face challenges in dynamically controlling public and private mode areas, leading to potential unauthorized viewing and luminance degradation due to fixed pixel configurations.

Innovation Solution

A pixel design with first and second subpixels, each with distinct viewing angles and transistor configurations, allows for dynamic switching between public and private modes based on image data, using different write gate signals and power supply voltages to control emission in odd and even frame periods.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If fixed public mode pixels and private mode pixels are used, then the display can provide both public and private viewing modes, but non-authorized viewers can still view private mode images and luminance degradation occurs

Engineering Contradiction:

Improvepublic and private mode viewing capabilityVSAvoidimage security and luminance stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The pixel is divided into first and second subpixels with different viewing angles. The first subpixel is configured for private mode viewing while the second subpixel is configured for public mode viewing. This segmentation allows the display to provide both private and public viewing capabilities within a single pixel structure, enabling image security while maintaining versatility.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements dynamic switching between public and private modes by controlling the emission of subpixels based on frame period parity. In odd-numbered frame periods, only the first subpixel emits (private mode), while in even-numbered frame periods, only the second subpixel emits (public mode). This dynamic control prevents unauthorized viewing and maintains luminance stability by ensuring exactly one subpixel emits light at any given time.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If both public and private mode pixels are present in fixed areas, then the display supports multiple viewing modes, but luminance degradation occurs due to the presence of both pixel types

Engineering Contradiction:

Improvemulti-mode display capabilityVSAvoidluminance

Core Design Contradiction:

Adaptability or versatilityVSIllumination intensity

Solution Approach 1:

The patent implements dynamic switching between public and private modes by controlling the emission of subpixels based on frame period parity. In odd-numbered frame periods, only the first subpixel emits (private mode), while in even-numbered frame periods, only the second subpixel emits (public mode). This dynamic control prevents unauthorized viewing and maintains luminance stability by ensuring exactly one subpixel emits light at any given time.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent ensures continuous useful action by maintaining emission from exactly one subpixel throughout the entire frame period. Both subpixels are configured to emit light during their respective active periods, ensuring that the display maintains adequate luminance without degradation from having both pixel types present simultaneously.

Inventive Principle:

Principle #20Continuity of useful action

3Device complexity

If fixed areas for public and private mode pixels are used, then the display structure is simple, but dynamic adjustment of public and private mode areas is not possible

Engineering Contradiction:

Improvepixel structureVSAvoiddynamic mode area adjustment

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The pixel is divided into first and second subpixels with different viewing angles. The first subpixel is configured for private mode viewing while the second subpixel is configured for public mode viewing. This segmentation allows the display to provide both private and public viewing capabilities within a single pixel structure, enabling image security while maintaining versatility.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements dynamic switching between public and private modes by controlling the emission of subpixels based on frame period parity. In odd-numbered frame periods, only the first subpixel emits (private mode), while in even-numbered frame periods, only the second subpixel emits (public mode). This dynamic control enables flexible adjustment of public and private mode areas without increasing structural complexity.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20250022418A1Pixel and display apparatus having the same

Publication Date: 2025.01.16 SAMSUNG DISPLAY CO LTD

AI summary

A pixel includes first and second subpixels. The first subpixel includes a first light emitting element, a first transistor configured to drive the first light emitting element, a second transistor configured to apply a data voltage to the first transistor in response to a first write gate signal and a fifth transistor configured to apply a power supply voltage to the first transistor in response to an emission signal. The second subpixel includes a second light emitting element having a viewing angle different from the first light emitting element, a sixth transistor configured to drive the second light emitting element, a seventh transistor configured to apply the data voltage to the sixth transistor in response to a second write gate signal different from the first write gate signal and a tenth transistor configured to apply the power supply voltage to the sixth transistor in response to the emission signal.