Organic Light Emitting Display Data Driver Pre-emphasis Voltage Control
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Solution Overview
Problem
Existing organic light emitting display devices face challenges in efficiently reducing data voltage charging time and controlling pre-emphasis voltage levels, which affects the display's ability to accurately express gray scales and reduce power consumption.
Innovation Solution
The organic light emitting display device incorporates a data driver with pre-emphasis voltages (Vp1 and Vp2) that are supplied before the data voltages (VGH and VGL), allowing for controlled voltage levels and reduced charging time, along with a scan driver that synchronizes scan signals with data signals to manage pixel emission states across subframes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If pre-emphasis voltage is applied before data voltage, then data voltage charging time is reduced, but voltage control complexity increases
Solution Approach 1:
The patent applies pre-emphasis voltage before the main data voltage to accelerate the charging process. The pre-emphasis voltage is a preliminary voltage level that is applied first, then transitioned to the final data voltage, thereby reducing the charging time required for the data line to reach its target voltage level.
Solution Approach 2:
The patent dynamically switches between different voltage levels (pre-emphasis voltage and data voltage) based on the timing requirements. The voltage control is not static but adapts the voltage level at different stages of the charging process, optimizing both speed and control.
2Manufacturing precision
If multiple pre-emphasis voltages are used, then gray scale expression is improved, but device complexity increases
Solution Approach 1:
The patent changes the voltage parameter by introducing multiple pre-emphasis voltage levels (first pre-emphasis voltage and second pre-emphasis voltage) that are different from each other and from the data voltage. This parameter variation enables finer control over the charging process and improves gray scale expression by allowing intermediate voltage states.
3Use of energy by stationary object
If data driving circuits are synchronized with scan driving circuits, then power consumption is reduced, but control complexity increases
Solution Approach 1:
The patent synchronizes the operation of data driving circuits with scan driving circuits to ensure continuous and efficient operation. The data driving circuits are activated only when needed during the scan period, avoiding unnecessary power consumption while maintaining coordinated control through the timing controller.
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 faster data voltage charging, improved gray scale expression, and reduced power consumption by effectively managing voltage levels and emission states, enhancing the display's efficiency and image quality.
Implementation Method 1
a first pre-emphasis voltage Vp1 and a second pre-emphasis voltage Vp2, which are supplied before first data voltage VGH and second data voltage VGL, respectively
Implementation Method 2
the organic light emitting displays display images using organic light emitting diodes that emit light through recombination of electrons and holes
Data Source
AI summary
An organic light emitting display device includes: a plurality of pixels coupled to scan lines and data lines; a plurality of scan driving circuits configured to receive a circuit selection signal and a line control signal, and to output a scan signal to the scan lines, corresponding to the circuit selection signal and the line control signal; a plurality of data driving circuits respectively coupled to the data lines, the plurality of data driving circuits being configured to select at least one of a first pre-emphasis voltage, a second pre-emphasis voltage, a first data voltage or a second data voltage, and to output the selected voltage to a corresponding one of the data lines; and a first decoder configured to supply the first pre-emphasis voltage, corresponding to the circuit selection signal and the line control signal.