OLED Pixel Circuit Power Management via Sensor Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electro-optical devices using OLED elements face challenges in reducing power consumption, especially when miniaturized for portable devices.
Innovation Solution
The electro-optical device incorporates an optical sensor to detect ambient light brightness and a temperature sensor, along with a control circuit that adjusts the pixel circuit operations based on these detections. During initialization periods, the control circuit executes specific operations to either supply a predetermined potential or distribute accumulated electric charge to the light-emitting element, optimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional pixel circuit configuration is used, then the device can be miniaturized for portable applications, but power consumption is not sufficiently reduced
Solution Approach 1:
The patent implements dynamic control of the pixel circuit operations based on real-time detection of ambient light brightness and temperature. The control circuit adjusts initialization operations, data line potential distribution, and light-emitting element drive modes according to environmental conditions, making the power consumption adaptive rather than static. This dynamic adjustment resolves the contradiction by enabling the miniaturized device to optimize energy usage according to actual operating conditions.
Solution Approach 2:
The patent changes operational parameters (potential levels, initialization timing, drive modes) based on detected environmental parameters (ambient light brightness, temperature). By modifying these parameters dynamically, the system reduces power consumption in the miniaturized device without compromising display performance, thus resolving the contradiction between device miniaturization and power consumption reduction.
2Reliability
If initialization operations are performed frequently to prevent black floating, then display quality is maintained, but power consumption increases
Solution Approach 1:
The patent implements periodic initialization operations at specific timing intervals rather than continuous initialization. The control circuit performs initialization at predetermined periods based on the display refresh cycle and environmental conditions, maintaining display quality while significantly reducing the frequency of power-intensive initialization operations compared to continuous initialization approaches.
Solution Approach 2:
The patent enables the pixel circuit to self-adjust and maintain stability through controlled potential distribution from the data line capacitance. Instead of requiring frequent external initialization interventions, the system uses the inherent capacitance of the data line to automatically distribute potential and prevent black floating, reducing the need for active power consumption during initialization.
3Stability of the object's composition
If the data line potential is continuously adjusted to prevent black floating, then display stability is improved, but temperature increase occurs
Solution Approach 1:
The patent performs preliminary initialization operations and potential distribution adjustments before the black floating condition actually occurs. By proactively managing the data line potential and performing initialization at predetermined timing, the system prevents black floating from developing, thereby maintaining display stability without requiring continuous high-power corrective adjustments that would generate excessive heat.
Solution Approach 2:
The patent incorporates temperature sensing and uses the detected temperature information as feedback to adjust initialization operations and data line potential management. When temperature increases are detected, the control circuit modifies its control strategy to reduce power-intensive operations, thus maintaining display stability while preventing excessive temperature rise through closed-loop feedback control.
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 effectively reduces power consumption by dynamically adjusting operations based on environmental conditions, while also minimizing the occurrence of 'black floating' and temperature-related issues.
Implementation Method 1
a light-emitting element configured emit light at brightness corresponding to a current flowing between two electrodes
Data Source
AI summary
An electro-optical device including at least one of an optical sensor and a temperature sensor, a pixel circuit and a control circuit is provided. The pixel circuit includes an OLED that emits light at brightness corresponding to a current flowing from an anode to a cathode, and a transistor that causes a current corresponding to a voltage between a gate node and a source node to flow through the OLED. The control circuit executes a reset operation or a non-reset operation in accordance with information that is a detection result of an optical sensor and information that is a detection result of a temperature sensor. The reset operation is an operation of supplying a predetermined potential to the anode via a data line. The non-reset operation is an operation of distributing an electric charge accumulated in the data line to the anode.