OLED Light Emission Correction via Temperature-Dependent Driving Signals
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Solution Overview
Problem
Conventional technologies fail to accurately correct the change in light emission of OLEDs due to temperature changes, leading to inconsistent image quality in image forming devices, as they apply the same correction data to all OLEDs regardless of their different temperature characteristics and driving current amounts.
Innovation Solution
A light-emitting device with a measurement unit, a predetermined value storage unit, and a driving signal calculation unit that applies a correction factor based on the measured surrounding temperature and desired light amount to adjust the driving signal for each OLED, ensuring accurate light emission correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same correction data is applied to all OLEDs, then the correction process is simple, but the light amount correction accuracy deteriorates because different OLEDs have different temperature characteristics
Solution Approach 1:
The patent applies different correction data to different OLEDs based on their individual temperature characteristics. Each OLED is assigned correction data corresponding to its specific characteristic temperature, rather than using a uniform correction approach. This localizes the correction quality to match each OLED's actual behavior, resolving the contradiction between simple processing and accurate correction.
Solution Approach 2:
The patent changes the correction parameter from a universal value to individualized correction data based on each OLED's characteristic temperature. By selecting correction data that corresponds to the specific temperature characteristic of each OLED, the system achieves accurate light amount correction while maintaining manageable process complexity through automated selection based on measured temperatures.
2Manufacturing precision
If different driving current amounts are supplied to different OLEDs to compensate for position differences, then light exposure uniformity is improved, but temperature characteristic variation increases making correction difficult
Solution Approach 1:
The patent dynamically selects correction data based on the actual measured temperature of each OLED during operation. Rather than using static pre-determined correction values, the system adapts the correction data in real-time according to the OLED's operating temperature, which varies with driving current and environmental conditions. This dynamic approach maintains correction accuracy despite variations in driving current amounts.
Solution Approach 2:
The patent implements a feedback mechanism where the temperature of each OLED is measured, and this measured temperature information is used to select appropriate correction data. This closed-loop feedback ensures that the correction is continuously adapted to the actual operating conditions, resolving the complexity introduced by different driving current amounts by using real-time temperature data to guide correction decisions.
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 high-accuracy correction of light emission changes in OLEDs due to temperature variations, ensuring uniform light exposure across different areas of the photoreceptor, thereby improving image quality by tailoring the driving current for each OLED.
Implementation Method 1
Conventional technology discloses a technology of applying organic light-emitting diodes (OLEDs) to optical writing devices executing optical writing onto a photoreceptor
Implementation Method 2
correcting a drive current amount of an OLED by referring to this table based on a surrounding temperature of the OLED that is measured by using a temperature sensor
Data Source
AI summary
A light-emitting device including a light-emitting element and causing the light emitting element to emit different light amounts. The light-emitting device includes: a measurement unit, a predetermined value storage unit, and a driving signal calculation unit. The measurement unit measures a surrounding temperature of the light-emitting element. The predetermined value storage unit stores a predetermined value of a driving signal for causing the light-emitting element to emit light. The driving signal calculation unit executes calculation of a value of the driving signal for causing the light-emitting element to emit a desired light amount by applying a correction factor in accordance with the measured surrounding temperature and the desired light amount to the predetermined value of the driving signal.