Controller for suppressing temperature of screen

Abstract

The present invention discloses a controller for suppressing the temperature of a screen in order to maintain the ambient temperature of the screen to the level of a predetermined standard temperature as to avoid the screen from being operated at abnormal temperature and lowering its service life. The present invention utilizes a temperature detector unit connected to a control unit for detecting the ambient temperature and outputting a temperature signal to the control unit. The temperature signal is compared with the predetermined standard temperature to determine the magnitude of a cold cathode fluorescent lamp for suppressing the operation of the screen to the best ambient temperature and maintaining the normal service temperature.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a controller for suppressing the temperature of a screen, more particularly to a controller for maintaining a screen to be operated at a normal ambient temperature. BACKGROUND OF THE INVENTION [0002] At present, an LCD screen of desktop and notebook computers, personal digital assistants (PDAs) and webpads utilizes a driver device to drive a high-voltage driven cold cathode fluorescent lamp (CCFL) and project a light on a backlit panel, so that users can view the display on screen clearly. Further, some of the present CCFL driver device manufacturers are solving the problems on how to equalize and stabilize the brightness of the CCFL. [0003] Some of the circuit designs related to the way of equalizing the brightness of the CCFL were disclosed in the R.O.C. Patent Publication No. 383122; the Japan Patent Publication Nos. 09-102397, 2000-150191, 2000-292775, 2004-69907, 2004-39336, 2000-243586, 2000-340388 and 2004-220810;...

AI Technical Summary

Benefits of technology

[0004] The primary objective of the present invention is to overcome the foregoing shortcoming and avoid the exiting deficiency by providing a controller for suppressing the temperature for the operation of a screen to a predetermined standard temperature. Unlike the foregoing patents, the invention provides a protective mechanism in addition of maintaining the equalized brightness of the CCFL under normal temperature, wherein a temperature detector unit connected to the control unit for detecting the ambient temperature and outputting a temperature signal to the control unit. The temperature signal and the predetermined standard temperature are compared to determine the magnitude of the drive power of the CCFL; if the temperature is higher than the predetermined standard temperature, then the drive power is reduced to achieve the purposes of lowering the temperature and suppressing the screen to operate at the best ambient temperature and maintaining the normal service life of the controller.

Problems solved by technology

However, a very difficult problem exists in the screen industry that the CCFL luminous area is a closed space and the heat produced cannot be dispersed effectively by the existing technology as to equalize the brightness of the CCFL, and it usually requires a higher drive voltage and current to overcome the problem, but on the other hand, the heat produced is increased (for example, the brightness should be adjusted for outdoors).

Besides this, if the screen is placed at a position with a high ambient temperature such as the living room illuminated by sunlight will give rise to an overloading ambient temperature to the overall screen, and thus affecting the service life of all electronic components and the liquid crystal display panel.

As a result, the CCFL will be damaged easily, and the resin equalizer will be deteriorated to produce the yellow phenomenon due to the high temperature.

Since the CCFL and equalizer are important components of a screen and it is difficult to replace the components once they are damaged, therefore most consumers are forced to replace the whole set of screen, which does not comply with the service life and economic benefits of the existing screens.

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