OLED Drive Circuit Reference Current Refresh for Noise Stability
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Solution Overview
Problem
Existing electro-optical devices with OLED elements face display quality issues due to deviations in the characteristics of current supply transistors, leading to inaccurate data signal generation, and compensation circuits struggle to maintain a stable reference voltage amidst noise variations.
Innovation Solution
A drive circuit with a reference current generating unit that performs a refresh operation to set the current value to a predetermined value multiple times, ensuring stable data signal generation, and includes a signal output unit that generates data signals based on the reference current or voltage, using a configuration with a compensation transistor, capacitor, and voltage supply circuit to stabilize the reference voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a compensation circuit with a compensation transistor is used to compensate for deviations in current supply transistors, then manufacturing precision is improved, but the reference voltage becomes unstable when affected by noise
Solution Approach 1:
The patent applies periodic action by repeatedly performing the refresh operation multiple times (e.g., 3 or more times) to reset the reference current to a predetermined value. This periodic refreshing compensates for noise-induced deviations and maintains stable reference voltage, resolving the contradiction between manufacturing precision and reliability.
2Manufacturing precision
If the reference current is set to a predetermined value once, then manufacturing precision is improved, but the data signal generation becomes unstable when noise affects the reference current
Solution Approach 1:
The patent implements periodic action by performing the refresh operation multiple times to repeatedly set the reference current to the predetermined value. This periodic resetting ensures that even if noise affects the reference current after initial setting, the data signal generation remains stable and accurate.
3Manufacturing precision
If a compensation circuit is added to each current output circuit, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing a refresh operation that can be performed multiple times using the same compensation circuit components (compensation transistor, capacitor, and voltage supply circuit). This multi-functional approach allows the same circuit structure to achieve both initial compensation and ongoing stability maintenance, reducing overall device complexity while improving manufacturing precision.
Data Source
AI summary
A drive circuit of an electro-optical device comprising electro-optical elements of which each gray scale is controlled in accordance with a data signal output to a data line includes a reference current that generates unit generating reference current and a signal output unit that generates the data signal corresponding to a current value of the reference current generated by the reference current generating unit on the basis of gray-scale data and outputs the generated data signal to the data line. The reference current generating unit performs a refresh operation of setting the current value of the reference current to a predetermined value plural times.