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Set of light emissive diode elements for a backlight device and backlight display

A technology of light-emitting diodes and backlight devices, applied in the direction of lighting devices, electrical components, static indicators, etc.

Active Publication Date: 2009-08-26
INTERDIGITAL CE PATENT HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage posed by this low control voltage is that when for example the power consumed by the diode has to be 100 watts and this power is operated at 2 volts, the necessary current is 50 amperes

Method used

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  • Set of light emissive diode elements for a backlight device and backlight display
  • Set of light emissive diode elements for a backlight device and backlight display
  • Set of light emissive diode elements for a backlight device and backlight display

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Embodiment Construction

[0030] According to the invention, each diode element of the element array, in addition to the light emitting diodes, comprises a voltage converter that reduces the voltage in order to power the diodes, and more particularly to store energy in a first phase of operation and release it in a second phase of operation to the diode.

[0031] figure 1 A backlight arrangement for a display according to the invention is shown. it includes:

[0032] - Groups 10 of light emitting diode elements grouped into basic blocks 20 organized into arrays of n rows and m columns; each basic block includes at least one light emitting diode element; the elements themselves are organized as Array; in this embodiment, although not mandatory, the size of the blocks is the same; the light emitted by each of these elements is time modulated; thus the elements are controlled in PWM mode (pulse width modulation).

[0033] - a row selection circuit 11, which sequentially selects the rows of the basic bl...

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PUM

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Abstract

The present invention is situated in the field of backlight devices for all types of backlight displays or projectors, such as liquid crystal displays or any type of backlight panel such as advertising panels. The invention relates to a backlight device with light emissive diodes (31) not requiring the suppl of a large current. According to the invention, each light emissive diode (31) of the backlight device is combined with a voltage converter capable of storing energy during part of the operating cycle and then discharging this energy into the light emissive diode (31) during another part of the cycle.

Description

technical field [0001] The present invention is in the field of backlighting devices for all types of backlit displays or projectors, such as liquid crystal displays, or any type of backlit panels, such as advertising boards. Background technique [0002] Such displays or projectors equipped with discharge tubes are known to be difficult to control in terms of intensity and chromaticity. Significant advances in light emitting diodes have enabled the realization of new types of backlight devices. Accordingly, the backlight device includes a plurality of light emitting diodes or LEDs organized in an array. These diodes may be grouped into basic blocks so that they can be controlled on a block-by-block basis rather than individually. These diodes are preferably dynamically controlled to improve the contrast and appearance of the display action. [0003] Each diode operates at low voltages on the order of 2 to 5 volts. The disadvantage of this low control voltage configurati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32
CPCH05B33/0818G09G3/3426G09G2310/024H05B45/375G09G3/14G09G3/32H05B45/37
Inventor 杰勒德·赖利杰勒德·莫里佐特菲利普·莱罗伊
Owner INTERDIGITAL CE PATENT HLDG