OLED Display Data Driver with Sensor-Based Compensation
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Solution Overview
Problem
Organic light emitting display devices face non-uniformity in display due to deviations in threshold voltages of driving transistors and deterioration of OLEDs, leading to reduced brightness over time.
Innovation Solution
Incorporating a sensor to extract deviation and deterioration information, and a converter to generate compensatory data, ensuring uniform current flow through transistors and OLEDs, thereby maintaining display quality despite voltage drops and OLED degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If driving transistors are used to control current in pixels, then the display device can operate with low power consumption, but threshold voltage deviations among transistors cause non-uniformity in display quality
Solution Approach 1:
The patent implements a feedback mechanism where the sensor measures the actual current flowing through the OLED and feeds this information back to the data driver. The data driver then adjusts the data signal to compensate for threshold voltage deviations, ensuring uniform display quality while maintaining low power consumption operation.
Solution Approach 2:
The patent replaces the reliance on precise transistor manufacturing (mechanical/physical process) with an electronic compensation system. Instead of depending on uniform transistor fabrication, the system uses sensors and data adjustment to electronically compensate for manufacturing variations, achieving display uniformity without improving manufacturing precision.
2Speed
If OLEDs are used for light emission, then the display device achieves high response speed and low power consumption, but OLED deterioration over time causes brightness reduction
Solution Approach 1:
The sensor continuously monitors the current through the OLED and detects changes due to deterioration. This information is fed back to the data driver, which adjusts the data signal to compensate for OLED aging effects, maintaining consistent brightness and reliability over time while preserving the high response speed characteristics.
Solution Approach 2:
The system performs preliminary measurement of OLED characteristics using the sensor and pre-adjusts the data signal before actual display operation. This preliminary action compensates for anticipated deterioration effects, ensuring brightness stability is maintained from the beginning of operation rather than waiting for degradation to occur.
3Manufacturing precision
If a sensor and converter are added to compensate for transistor deviation and OLED deterioration, then display quality is improved, but device complexity increases
Solution Approach 1:
The sensor is designed to serve multiple functions: it measures current for compensation, characterizes OLED properties, and provides feedback for both transistor deviation and OLED deterioration compensation. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity while achieving improved display quality.
Solution Approach 2:
The patent merges the sensor and converter functions into an integrated compensation system that works closely with the existing data driver. By combining these functions and integrating them with existing pixel circuitry, the patent minimizes the added complexity while achieving the goal of improved display quality through compensation for both transistor deviation and OLED deterioration.
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
The solution compensates for deviations and deterioration, maintaining uniform current flow and improving display quality by adjusting data signals to ensure consistent brightness and image quality.
Implementation Method 1
an organic light emitting display device displays an image by using organic light emitting diodes (OLED) that generate light components (colors) by re-combination of electrons and holes
Data Source
AI summary
An organic light emitting display device includes pixels, a sensor configured to extract at least one of deviation information of first transistors of the pixels and deterioration information of OLEDs of the pixels in a sensing period, and a converter configured to change a bit of first data input from the outside by using at least one of the deviation information and the deterioration information, and to generate second data, wherein a pixel at an ith horizontal line includes an OLED, a first transistor configured to control an amount of a current that flows from a first power source via the OLED in response to a voltage of a first node, second and third transistors configured to turn on when a scan signal is supplied to an ith scan line, and a fourth transistor configured to turn on when a control signal is supplied to an ith control line.