Liquid crystal backlight device and method for controlling the same
First Claim
1. A control method of a liquid crystal backlight device, said control method comprising the steps of:
- obtaining a stable display time;
modulating a backlight illumination signal;
generating a modulated backlight activation signal; and
controlling a backlight activation timing;
whereby the activation timing of a backlight module can be controlled to change its backlight illumination pattern so as to produce a stable illumination effect.
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Accused Products
Abstract
A liquid crystal backlight device and a method for controlling the same are applied to a liquid crystal display apparatus, in which a backlight module is disposed behind a liquid crystal panel to illuminate the panel. The backlight device produces stable illumination to solve the hold type problem due to the hold-type effect of liquid crystal occurred in the prior art. The control method is used to acquire a stable display time from the liquid crystal characteristics and then process the scan signal to match the display data. Controls of the backlight activation signal, including on/off, time delay, and duty cycle adjustment, are then performed to generate a pulse-width modulated signal and a brightness modulated signal so as to produce stable backlight illumination effect. A better display effect can therefore be accomplished.
31 Citations
14 Claims
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1. A control method of a liquid crystal backlight device, said control method comprising the steps of:
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obtaining a stable display time;
modulating a backlight illumination signal;
generating a modulated backlight activation signal; and
controlling a backlight activation timing;
whereby the activation timing of a backlight module can be controlled to change its backlight illumination pattern so as to produce a stable illumination effect. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A control method of a liquid crystal backlight device, said control method comprising the steps of:
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acquiring a stable display time from characteristics of the liquid crystal;
performing delay control to a backlight activation time;
adjusting a duty cycle of backlight illumination;
performing pulse-width modulation of backlight illumination;
adjusting a backlight illumination frequency;
adjusting a backlight illumination intensity;
generating a modulated backlight activation signal; and
controlling a backlight illumination pattern of said backlight module.
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9. A display apparatus having a liquid crystal backlight device, said display apparatus controlling its backlight illumination pattern to produce differences in the illumination frequency, illumination intensity, or pulse width of an illumination signal when switching frames so as to improve the hold type and flickering phenomena through the generated stable illumination backlight, said display apparatus comprising:
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a display signal output unit for receiving a display signal sent from an external device;
a stable-time calculation unit coupled with said display signal output unit and used to obtain a stable display time according to said display signal received by said display signal output unit;
a signal processing unit coupled with said stable-time calculation unit and used to produce a pulse-width modulated signal;
a backlight module control unit for receiving said pulse-width modulated signal to produce a backlight activation signal;
a backlight module coupled with said backlight module control unit and used for backlight illumination of a liquid crystal module;
a display controlling unit coupled with said display signal output unit and used to generate display data and a scan signal;
a scan drive unit coupled with said liquid crystal module; and
a data drive unit coupled with said liquid crystal module. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification