Holding Units for Uniform Luminosity in Light Emitting Devices
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Solution Overview
Problem
Existing light emitting devices, such as those using organic light emitting diodes (OLEDs), face challenges in achieving uniform light emission intensity due to variations in the manufacturing process, leading to inconsistent luminosity even when driven by the same current for the same duration.
Innovation Solution
The implementation of holding units to maintain a regulated driving signal magnitude across multiple light emitting elements, combined with supply units that ensure the signal is held for a specific duration based on the desired gradation, allows for uniform brightness across the light emitting elements. This solution includes the use of memory units to store signal data for correcting variations and temperature compensation to maintain consistent performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a plurality of light emitting elements are arranged in a head unit, then the light emitting device can form images, but the luminosity varies across elements leading to non-uniform light emission
Solution Approach 1:
The patent applies local quality by individually adjusting the driving current magnitude for each light emitting element based on its specific luminosity characteristics. Holding units are provided for each element to store individual correction values, allowing each element to be optimized locally rather than treating all elements uniformly, thus resolving the luminosity variation problem while maintaining the image forming capability of the array.
2Manufacturing precision
If the driving current magnitude is adjusted for each light emitting element to correct luminosity variation, then uniform brightness can be achieved, but the device complexity increases
Solution Approach 1:
The patent merges the correction function into the existing driving circuitry by integrating holding units within the driver circuit that supplies driving currents to the light emitting elements. This combination approach allows individual element correction without requiring completely separate control systems for each element, thus reducing overall device complexity while achieving luminosity uniformity.
3Manufacturing precision
If memory units are added to store correction data for each light emitting element, then luminosity correction can be implemented, but the area of the light emitting panel increases
Solution Approach 1:
The patent implements multi-functionality by designing holding units that serve dual purposes: they act as memory elements to store correction data for each light emitting element and simultaneously function as part of the driving circuitry that supplies corrected driving currents. This eliminates the need for separate dedicated memory components, thereby avoiding additional area expansion while enabling luminosity correction.
Data Source
AI summary
A light emitting device includes: a plurality of light emitting elements that emit light to have luminosity depending on the magnitude of a driving signal; a plurality of holding units that are respectively disposed in the plurality of light emitting elements, and respectively hold the driving signal to maintain a magnitude regulated such that the luminosity of the plurality of light emitting elements becomes uniform; and a plurality of supply units that are respectively disposed in the plurality of light emitting elements, and supply the driving signal, which is held by the holding units to have a certain magnitude for a period of time according to a gradation of light to be emitted, to a corresponding light emitting element.