Display Backlight Control with Resistor Switching for Flicker-Free Dimming
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Solution Overview
Problem
Existing display apparatuses with low-cost drivers struggle to adjust the entire range of brightness using analog dimming control due to limitations in recognizing driving current amplitudes, leading to potential eye fatigue from flickering issues with pulse width modulation.
Innovation Solution
A display apparatus that adjusts brightness by setting an output resistor based on the display panel's brightness, using a processor to identify the appropriate driving voltage amplitude and resistance value, allowing continuous adjustment across the entire brightness range through analog dimming control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pulse width modulation dimming control is used to adjust brightness sections that cannot be controlled by analog dimming, then the brightness adjustment range is extended, but a flicker phenomenon occurs causing eye fatigue
Solution Approach 1:
The patent changes the resistance value of the output resistor to a second resistance value that enables the driver to recognize larger DC signal sizes, thereby extending the analog dimming control range to cover higher brightness sections that would otherwise require PWM control
Solution Approach 2:
The patent dynamically switches between different resistance values of the output resistor based on the target brightness level, selecting the first resistance value for lower brightness and the second resistance value for higher brightness to maintain optimal control across the entire brightness range
2Ease of manufacture
If a low-priced driver adjusting driving current amplitude based on DC signal is used, then cost is reduced, but the brightness adjustment range is limited due to component specifications
Solution Approach 1:
The patent changes the resistance value of the output resistor to extend the range of DC signal sizes that the low-priced driver can recognize, thereby expanding the brightness adjustment range without increasing driver cost
Solution Approach 2:
The patent dynamically adjusts the output resistor value based on the target brightness level, enabling the low-priced driver to handle both small and large DC signal sizes by switching between first and second resistance values
Data Source
AI summary
A display apparatus is disclosed. The present display apparatus comprises: a display panel; a backlight unit configured to provide light to the display panel by using a plurality of light-emitting elements; a driver configured to provide a driving current to the plurality of light-emitting elements on the basis of an amplitude of a driving voltage; a memory storing information on an amplitude of a driving voltage according to a plurality of brightnesses for each resistance value of an output resistor connected to the driver; and a processor configured to set a resistance value of the output resistor on the basis of a brightness value of the display panel, identify an amplitude of the driving voltage corresponding to the brightness value of the display panel from among amplitudes of the driving voltage according to the plurality of brightnesses corresponding to the set resistance value on the basis of the information stored in the memory, and apply the driving voltage of the identified amplitude to the driver, wherein an amplitude of the driving current is determined on the basis of the amplitude of the driving voltage and the resistance value of the output resistor.