Backlight Duty Cycle Adjustment for Display Brightness Accuracy
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Solution Overview
Problem
Existing display technologies face challenges in accurately adjusting backlight brightness, leading to significant brightness jumps and affected user experience due to low accuracy in adjusting the duty cycle of light-emitting control signals, especially when N and n are large.
Innovation Solution
A method and device that adjust the duty cycle of a light-emitting control signal by modifying only a part of the N pulse cycles, where N is greater than 2, to improve brightness adjustment accuracy and range, involving options like selecting odd or even pulse cycles, specific cycle ranges, or threshold-based adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the low-voltage-level duration of the EM signal is changed by n lines each time, then the brightness adjustment range is expanded, but the brightness adjustment accuracy deteriorates significantly when N and n are large
Solution Approach 1:
The patent divides the N pulse cycles into multiple groups, where only a subset of groups are adjusted by n lines at a time. This segmentation allows the total adjustment range to be maintained while reducing the step size in each adjustment operation, thereby improving brightness adjustment accuracy. For example, if N=100 and we want to adjust by n=10 lines, instead of adjusting all 100 pulse cycles by 10 lines (which would cause large brightness jumps), we divide them into 10 groups of 10 pulse cycles each, and adjust only one group at a time, resulting in much smaller effective brightness steps.
2Measurement precision
If more pulse cycles are adjusted to achieve finer brightness control, then the brightness adjustment accuracy is improved, but the electromagnetic interference increases and power consumption rises
Solution Approach 1:
The patent extracts and adjusts only a specific subset of pulse cycles from the total N pulse cycles, rather than adjusting all of them. By selecting and adjusting only the necessary number of pulse cycles (a proper subset of N), the system achieves the required brightness adjustment accuracy while minimizing the number of pulse cycles that need to be modified, thereby reducing electromagnetic interference and power consumption associated with signal adjustments.
3Adaptability or versatility
If the duty cycle of all N pulse cycles is adjusted simultaneously, then the brightness adjustment range is maximized, but the system complexity and adjustment time increase
Solution Approach 1:
The patent segments the N pulse cycles into multiple groups and adjusts only a subset of these groups at each adjustment step. This segmentation strategy maintains the overall brightness adjustment range (by being able to adjust different combinations of groups) while significantly reducing the complexity of each adjustment operation, as fewer pulse cycles need to be controlled and monitored simultaneously.
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 enhances backlight brightness adjustment accuracy and widens the adjustable range, reducing the number of pulse cycles to be adjusted and minimizing electromagnetic interference, while maintaining stability and reducing power consumption.
Implementation Method 1
a pulse width modulation (PWM) waveform is usually used to control a LED driver to perform light adjustment. Controlling, by use of the PWM waveform, the LED driver to perform light adjustment is to control the LED driver periodically provide output current to the LED backlight source
Implementation Method 2
LED (Light Emitting Diode) is a solid-state semiconductor device, which can directly convert electrical energy into light energy
Data Source
AI summary
Disclosed is a brightness adjustment method, a device and a display apparatus. The method comprises: acquiring a brightness adjustment instruction and a target display brightness value of a display panel, a display brightness value representing backlight brightness of the display panel; adjusting a duty cycle of the light-emitting control signal based on the target display brightness value of the display panel; driving LEDs of a corresponding row in a backlight source to emit light by the adjusted light-emitting control signal. Each time the duty cycle of the light-emitting control signal needs to be adjusted, a duty cycle of each pulse cycle of a part of N pulse cycles of the light-emitting control signal is selected for corresponding adjustment, thus backlight brightness adjustment accuracy of the display panel is effectively improved, and an adjustable range of backlight brightness of the display panel is wider.