Electro-Optical Device Current Control Circuit
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Solution Overview
Problem
Existing electro-optical devices face challenges in generating a correction current with high accuracy using a simple circuit, particularly in printer systems where the correction current is significantly smaller than the reference current, leading to increased circuit size and difficulty in achieving precise gradation control.
Innovation Solution
An electro-optical device with a controller that generates separate control signals for a reference current and a correction current, allowing the correction current period to be shorter than the reference current period, enabling high-accuracy gradation correction and reducing the circuit size of the correction current source by increasing the magnitude of the correction current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the correction current magnitude is increased to improve measurement precision, then the circuit size can be reduced, but the correction current becomes a larger portion of the reference current
Solution Approach 1:
The patent applies periodic action by dividing the current supply into distinct time periods: a first period for supplying reference current and a second period for supplying correction current. The correction current is supplied during a specific time window within the overall current cycle, allowing the circuit to use larger current magnitudes during correction periods while maintaining proper gradation control through temporal separation of current functions.
Solution Approach 2:
The patent changes the temporal parameter of current supply by defining different time periods for reference current and correction current. By controlling the duration and timing of the second period relative to the first period, the system can supply larger correction current magnitudes without compromising the accuracy of gradation representation, thus reducing circuit size while maintaining measurement precision.
2Manufacturing precision
If separate control signals are used for reference current and correction current periods, then gradation control accuracy is improved, but the control system complexity increases
Solution Approach 1:
The patent segments the control of reference current and correction current by generating separate control signals for each current type. The controller produces a first control signal for the reference current period and a second control signal for the correction current period, allowing independent optimization of each current's timing and magnitude while maintaining overall system accuracy.
Solution Approach 2:
The controller preliminarily determines the timing and duration of the second period (correction current period) relative to the first period (reference current period) before actual current supply. This preliminary setup of control signal parameters enables precise gradation correction to be performed during the designated correction period without requiring complex real-time adjustments during operation.
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 approach allows for high-accuracy gradation correction in electro-optical elements like OLEDs, reducing the circuit size required for the correction current source while ensuring precise light emission control, even with longer data lines.
Implementation Method 1
an electro-optical element that emits an amount of light corresponding to the driving current
Data Source
AI summary
An electro-optical device includes a controller, a reference current source, a correction current source, a combining unit, and an electro-optical element. The controller generates a reference current control signal defining a first period during which a reference current is output, and a correction current control signal defining a second period during which a correction current is output, the second period being shorter than the first period. The reference current source generates the reference current based on the reference current control signal. The correction current source generates the correction current based on the correction current control signal. The combining unit combines the reference current and the correction current to generate a driving current. The electro-optical element emits an amount of light corresponding to the driving current. The controller generates the reference current control signal and the correction current control signal so that the second period is shorter than the first period.