OLED Panel Photosensitive Element Brightness Adaptation

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Solution Overview

Problem

Existing organic light-emitting display panels struggle to effectively adjust luminance in response to varying environmental brightness, leading to over bright or over dark visual experiences for human observers.

Innovation Solution

Incorporating a photosensitive element in the non-display region of the panel to sense environment brightness and control the enable signal duration for the light-emitting diode, allowing for dynamic luminance adjustment through a control circuit that processes and stores brightness information to optimize light-emitting time based on environmental conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If external or internal compensation is used to correct threshold voltage drift, then screen uniformity is improved, but the ability to compensate for environmental brightness variations is lost

Engineering Contradiction:

Improvescreen uniformityVSAvoidenvironmental brightness adaptation

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The patent divides the compensation function into two independent modules: threshold voltage compensation (through external or internal compensation circuits) and environmental brightness compensation (through photosensitive element-based luminance adjustment). This segmentation allows both functions to operate simultaneously without interfering with each other, resolving the contradiction between screen uniformity and environmental adaptation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The display system is enhanced with multi-functionality by integrating both threshold voltage compensation mechanisms and environmental brightness sensing capabilities. The system can now perform multiple compensation tasks simultaneously - correcting transistor threshold drift while also adapting to ambient light conditions, thereby achieving both screen uniformity and environmental adaptability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Stability of the object's composition

If fixed luminance is maintained for threshold voltage compensation, then display consistency is improved, but visual comfort in varying environments deteriorates

Engineering Contradiction:

Improvedisplay consistencyVSAvoidover bright or over dark visual experience

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The patent introduces dynamic luminance adjustment capability while maintaining stable threshold voltage compensation. The photosensitive element continuously monitors environmental brightness and dynamically adjusts the enable signal duration to the light-emitting diode, allowing the display to adapt to changing ambient conditions without affecting the stability of the threshold voltage compensation mechanism.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system employs periodic sensing of environmental brightness by the photosensitive element, which continuously monitors ambient light conditions and periodically adjusts the luminance output accordingly. This periodic action ensures the display maintains visual comfort in varying environments while the threshold voltage compensation operates continuously to preserve display consistency.

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

This solution enables the organic light-emitting display panel to automatically adjust its luminance to match the environment, preventing over bright or over dark issues and enhancing the visual experience by ensuring appropriate luminance levels are maintained, thereby effectively compensating for environmental brightness variations.

Implementation Method 1

a photosensitive element disposed at a non-display region of the organic light-emitting display panel... The photosensitive element is configured to sense environment brightness

Methodology Applied

Scientific EffectPhotoelectric Effect: Photoelectric Effect

Implementation Method 2

a light-emitting diode... whose light emission luminance is determined by a driving current of a driving transistor

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS10665165B2Organic light-emitting display panel, organic light-emitting display apparatus, and driving method of organic light-emitting display panel

Publication Date: 2020.05.26 WUHAN TIANMA MICRO ELECTRONICS CO LTD

AI summary

An organic light-emitting display panel, an organic light-emitting display apparatus and a driving method of the organic light-emitting display panel are provided. The organic light-emitting display panel includes a data line and a gate line intersecting the data line, a switching signal line, a pixel driving circuit including a first voltage terminal for supplying a high-level direct current voltage, a driving transistor, a light-emitting diode and a photosensitive switch electrically connected between the first voltage terminal and the light-emitting diode; a photosensitive element disposed at a non-display region of the organic light-emitting display panel; and a control circuit including a storage module and a control module. The photosensitive element is configured to sense environment brightness and is electrically connected with the control circuit.