Emissive Display Driving Circuit Pulse Control
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Solution Overview
Problem
Recent emissive type display devices face challenges in controlling luminance effectively, leading to high power consumption and display quality issues, particularly in portable devices that require adjustable brightness and low luminance modes to conserve energy and reduce glare.
Innovation Solution
The implementation of a driving technique that varies the amplitude and application period of the driving voltage applied to power supply lines in an active matrix organic EL display, allowing for adjustable peak luminance levels by dividing the driving voltage into pulse waveforms and controlling the amplitude at each output time, thereby reducing power consumption and minimizing display characteristics variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the driving voltage amplitude is increased to achieve higher peak luminance, then the luminance performance is improved, but the power consumption increases
Solution Approach 1:
The patent applies periodic action by dividing the driving voltage into multiple pulse waveforms within each frame period. Instead of applying a single high-amplitude voltage continuously, the driving circuit outputs multiple pulses with optimized amplitude and width, achieving the required peak luminance while reducing overall power consumption through temporal distribution of the driving energy.
Solution Approach 2:
The patent implements dynamics by making the driving voltage parameters (amplitude and application period) adjustable and adaptive. The driving circuit dynamically changes the amplitude and width of pulse waveforms based on the required peak luminance level, allowing optimization of power consumption for different display scenarios while maintaining the ability to achieve high peak luminance when needed.
2Illumination intensity
If the driving voltage application period is extended to increase average luminance, then the brightness is improved, but the power consumption increases
Solution Approach 1:
The patent uses periodic action by implementing multiple pulse waveforms within each frame period instead of continuous voltage application. The driving circuit can adjust the distribution, amplitude, and width of these pulses to achieve the desired average luminance while minimizing power consumption through optimized temporal patterns.
3Adaptability or versatility
If the input signal amplitude is increased to expand dynamic range, then the luminance control capability is improved, but the driving circuit power consumption increases
Solution Approach 1:
The patent applies parameter changes by optimizing the amplitude and width parameters of multiple pulse waveforms instead of relying on high-amplitude analog signals. The driving circuit processes digital input signals and converts them into optimized pulse patterns, achieving wide dynamic range for luminance control while keeping the driving circuit power consumption low through efficient digital-to-analog conversion and pulse generation.
4Use of energy by moving object
If the emission time length is reduced to save power, then the power consumption is reduced, but the display characteristics vary
Solution Approach 1:
The patent resolves this contradiction by using multiple periodic pulse waveforms instead of a single continuous emission period. By distributing the total emission time across multiple optimized pulses, the system reduces overall power consumption while maintaining consistent display characteristics through controlled pulse patterns that ensure uniform organic EL element 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 a wider range of adjustable luminance levels, reducing power consumption, suppressing flicker, and enhancing display quality by dispersing the output of the driving voltage, which results in a higher apparent blinking frequency and improved contrast ratio.
Implementation Method 1
a pixel array section (13) having pixels capable of light emission in response to application of a driving voltage
Data Source
AI summary
An emissive type display device includes: a pixel array section having pixels ready for an active matrix driving system; a circuit for setting a peak luminance level of each display frame; and a driving circuit for variably controlling a total application period length of a driving voltage applied to a power supply line connected to each pixel and amplitude of the driving voltage so as to obtain a set peak luminance level, when the set peak luminance level is lower than a set value, the driving circuit dividing the driving voltage into a plurality of times of pulse waveform, and variably controlling the amplitude of the driving voltage at each output time according to the peak luminance level such that the amplitude of the driving voltage at least one output time is lower than a maximum driving voltage in a non-emission period.