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Device and method for driving a plurality of loads

A technology of a driving device and a driving method, which is applied to lighting devices, circuit devices, DC network circuit devices, etc., can solve problems such as output voltage increase, and achieve the effect of simplifying the structure, realizing detection accuracy, and simplifying the structure of current detection.

Inactive Publication Date: 2005-07-13
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, in a backlighting device of a liquid crystal display used for a liquid crystal display panel, when a fluorescent lamp stops emitting light due to aging of electrodes at the end of life or due to a change in internal high-pressure gas, or when a connector for connecting a fluorescent tube When the fluorescent lamp does not emit light due to dislocation or disconnection of the wire, the output of the inverter will become a no-load state, and the output voltage will increase abnormally

Method used

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  • Device and method for driving a plurality of loads
  • Device and method for driving a plurality of loads
  • Device and method for driving a plurality of loads

Examples

Experimental program
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no. 1 example

[0032] A first embodiment of the present invention will be described with reference to FIG. 3 . FIG. 3 is a schematic diagram of a backlight device according to a first embodiment of the present invention.

[0033] The backlight device 30 constitutes a back light source of a transmissive display device such as a liquid crystal display not shown in the figure. This backlight device 30 has an inverter circuit 32 serving as a driving device for various loads, and also has a cold-cathode tube group 34 as an example of a plurality of loads, thereby forming a cold-cathode tube inverter. The cold cathode tube group 34 is composed of cold cathode tubes 341 , 342 , 343 . . . and 34N. At this time, the inverter circuit 32 is a power supply unit directed to each load of the cold cathode tubes 341, 342, 343..., and 34N. The inverter circuit 32 corresponds to the cold cathode tubes 341, 342, 343 ... and 34N, and provides high-voltage control circuits 361, 362, 363 ... and 36N, a step-up ...

no. 2 example

[0041] refer to Figure 4 A second embodiment of the present invention will be described. Figure 4 is a schematic diagram of a backlight device according to a second embodiment of the present invention.

[0042] In the backlight device 30 of the second embodiment, the inverter circuit 32 serving as a driving device, the cold cathode tubes 341, 342, 343... and 34N serving as a plurality of loads of the inverter circuit 32, and the The structure and operation of the high-voltage control circuits 361, 362, 363...36N, the step-up transformer 38, and the capacitor 40 of the drive portion of the inverter circuit 32 are the same as those described in the first embodiment. Therefore, descriptions of these functions are omitted.

[0043] The image display control section 49, for example, may be provided to an image system such as a television receiver, a display unit, a personal computer (PC), and controls image display of a liquid crystal display not shown in the figure. Also, in ...

no. 3 example

[0055] refer to Figure 6 A third embodiment of the present invention will be described. Figure 6 It is a schematic diagram of a backlight device according to a third embodiment of the present invention.

[0056] In the backlight device 30 of the third embodiment, the inverter circuit 32 serving as a driving device, the cold cathode tubes 341, 342, 343... and 34N serving as a plurality of loads of the driving device, and the The structure and operation of the high-voltage control circuits 361, 362, 363...36N, the step-up transformer 38, and the capacitor 40 of the drive section are the same as those described in the first embodiment. Therefore, descriptions of these functions are omitted.

[0057] The image display control section 49, for example, can be provided to an image system such as a television receiver, a display unit, a personal computer (PC), and has an image vertical synchronization signal output section 72, a brightness control section 74, and the like. The im...

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Abstract

The invention provides a simplified structure required for abnormality detection, which is used in driving loads such as cold cathode tubes used in backlight devices of liquid crystal displays, without destroying the detection accuracy of abnormality detection. To this end, a driving device that sequentially drives a plurality of loads (such as cold cathode tubes) includes: a driving section that sequentially drives each load by a time-division method; and an abnormality detection section that detects abnormality of each load when each load is driven. This drive unit drives sequentially for each load, and detects abnormality of the load.

Description

technical field [0001] The invention relates to a driving system of various loads, such as a driving system of cold cathode tubes in a backlight system, and the backlight system is used in backlight sources of transmission display devices such as liquid crystal displays. In particular, the present invention relates to a driving device and a method thereof. For example, the driving device can be used as a driving source to provide an abnormality detection function of a load of an inverter or the like. Background technique [0002] Recently, liquid crystal display panels are used for data display of computers and the like to display imaging of television receivers, and in order to adapt to such an expanded range of applications, high-brightness display is required to satisfy high quality of images and the like. In order to cope with the improvement of such high brightness, a backlight system is used in which a plurality of cold cathode tubes are arranged in parallel directly u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/133G01R31/28G02F1/13357G09G3/36H02J1/00H05B37/03H05B41/24H05B41/282H05B41/285
CPCH05B41/245H05B41/2822H05B41/2855H05B47/21G02F1/133
Inventor 广末庸治
Owner FUJITSU LTD