Apparatus and method for driving backlight unit
First Claim
1. A drive apparatus for a backlight unit comprised of groups of LED (Light Emitting Diode) elements in which the plural LED elements are cascade-connected every three primary colors,the drive apparatus comprising:
- signal generating means for generating a signal having an arbitrary amplitude;
adjustment means for adjusting light emission quantities of the groups of the LED elements on the basis of the signal which has been generated by the signal generating means;
voltage applying means for applying a predetermined voltage every the groups of the LED elements;
light emission quantity detecting means for detecting quantities of ray of light which are emitted from the groups of the LED elements in accordance with the voltage which has been applied by the voltage applying means;
temperature detecting means for detecting temperature or temperatures of the groups of the LED elements; and
control means for controlling the signal generating means on the basis of the light emission quantities which have been detected by the light emission quantity detecting means and the temperature or temperatures which has or have been detected by the temperature detecting means.
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Accused Products
Abstract
The present invention is directed to a drive apparatus for a backlight unit (20) in which plural LED (Light Emitting Diode) elements are cascade-connected every three primary colors, which comprises a signal generating unit (44) for generating a signal having an arbitrary amplitude, an adjustment unit (50) for adjusting light emission quantities of groups of LED elements (30) on the basis of the signal which has been generated by the signal generating unit (44), a voltage applying unit (41) for applying a predetermined voltage every the groups of LED elements (30), light emission quantity detecting units (33) for detecting quantities of rays of light which have been emitted from the groups of LED elements (30), calorific value detecting units (32) for detecting calorific values emitted from the groups of LED elements in accordance with the voltage which has been applied to the voltage applying unit (41), and a control unit (50) for controlling the signal generating unit (44) on the basis of light emission quantities which have been detected by the light emission quantity detecting units (33) and calorific values which have been detected by the calorific value detecting units (32).
38 Citations
16 Claims
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1. A drive apparatus for a backlight unit comprised of groups of LED (Light Emitting Diode) elements in which the plural LED elements are cascade-connected every three primary colors,
the drive apparatus comprising: -
signal generating means for generating a signal having an arbitrary amplitude; adjustment means for adjusting light emission quantities of the groups of the LED elements on the basis of the signal which has been generated by the signal generating means; voltage applying means for applying a predetermined voltage every the groups of the LED elements; light emission quantity detecting means for detecting quantities of ray of light which are emitted from the groups of the LED elements in accordance with the voltage which has been applied by the voltage applying means; temperature detecting means for detecting temperature or temperatures of the groups of the LED elements; and control means for controlling the signal generating means on the basis of the light emission quantities which have been detected by the light emission quantity detecting means and the temperature or temperatures which has or have been detected by the temperature detecting means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A drive method for a backlight unit comprised of groups of LED (Light Emitting Diode) elements in which the plural LED elements are cascade-connected every three primary colors,
the drive method comprising: -
a voltage application step of applying a predetermined voltage every the groups of the LED elements; a light emission quantity detection step of detecting quantities of rays of light which are emitted from the groups of the LED elements in accordance with the voltage which has been applied by the voltage application step; a temperature detection step of detecting temperature or temperatures of the groups of the LED elements; a signal generation step of generating a signal having an arbitrary amplitude on the basis of light emission quantities which have been detected by the light emission detection step and the temperature or temperatures which has or have been detected by the temperature detection step; and an adjustment step of adjusting light emission quantities of the groups of the LED elements on the basis of the signal which has been generated by the signal generation step. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification