Light-Emitting Element Driving Method Using Preset Pulse Signals
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Solution Overview
Problem
Existing display panel technologies using pulse width modulation (PWM) for backlight control have low driving efficiency and limited number of supported channels due to the need for frequent LED pulsing to achieve desired brightness, especially when dealing with high grayscale values like 256.
Innovation Solution
A method and device that calculate the required backlight brightness for each pixel partition of a display image and select appropriate pulse signals from a set of preset signals with different driving voltages or currents to drive light-emitting elements, utilizing a brightness relationship table to determine the necessary pulse signals and their frequency to achieve the desired brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If pulse width modulation (PWM) technology is used to control backlight brightness by continuously pulsing LEDs, then the desired brightness can be achieved through time division addition, but the driving efficiency is low and the number of supported driving channels is limited
Solution Approach 1:
The patent changes the driving parameters by using preset pulse signals with different driving voltages or currents instead of uniform high-frequency pulsing. By querying a brightness relationship table, the system selects pulse signals with appropriate parameters to achieve the required brightness with fewer pulses, thereby improving driving efficiency while maintaining the desired illumination intensity.
2Measurement precision
If 256 pulses are input to LEDs to add up the brightness for a grayscale value of 256, then the desired brightness level can be achieved, but the driving efficiency becomes low and the number of supported channels decreases
Solution Approach 1:
Instead of always using the maximum number of pulses (256) to achieve the brightest grayscale level, the patent uses partial action by selecting from preset pulse signals with different strengths. The brightness relationship table allows the system to determine the minimum necessary pulse configuration to achieve the required grayscale precision, reducing the total number of pulses needed while maintaining measurement precision.
Solution Approach 2:
The patent introduces parameter variation by using preset pulse signals with different driving voltages or currents. This allows the system to achieve different brightness levels with varying pulse parameters rather than relying solely on pulse count, thereby improving driving efficiency while preserving grayscale precision.
3Speed
If high frequency data line signals are used to quickly turn LEDs on and off during scan time, then brightness can be accumulated to expected display brightness, but the driving device complexity increases and fewer driving channels are supported
Solution Approach 1:
The patent applies preliminary action by pre-setting multiple pulse signals with different driving voltages or currents before the actual display operation. The brightness relationship table is prepared in advance, allowing the driving device to quickly lookup and select the appropriate preset pulse signal without performing complex real-time calculations, thereby reducing device complexity while maintaining fast LED switching capability.
Solution Approach 2:
By using preset pulse signals with varied parameters (different voltages or currents), the system can achieve different brightness levels without requiring high-frequency switching for all cases. This parameter diversity allows the driving device to operate at lower frequencies for certain brightness levels, reducing overall device complexity while preserving the ability to switch quickly when needed.
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 improves driving efficiency, reduces pulse output frequency, and increases the number of supported channels by selectively using pulse signals to achieve the required backlight brightness, enhancing the overall performance of light-emitting element driving systems.
Implementation Method 1
the LED to be quickly turned on and off
Implementation Method 2
a driving device inputs a certain number of same pulses to LEDs through the data lines (Data) to control a number of times of light-emitting of the LEDs
Data Source
AI summary
The invention discloses a driving method and a device for a light-emitting element. The method includes: acquiring a display image; calculating a backlight brightness required for the display image; and selecting at least one pulse signal from the preset plurality of pulse signals to drive the light emitting element according to the backlight brightness.