Device and method for realizing multi-color backlight by means of two-line transmission diving method

A realization method and backlight technology, applied to instruments, static indicators, etc., can solve the problems of different light emitting diodes, poor backlight uniformity, uneven color brightness, etc., and achieve the goals of reducing complexity, reducing quantity, saving quantity and cost Effect
CN103514838AActive Publication Date: 2014-01-15SCHNEIDER ELECTRIC IND SAS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SCHNEIDER ELECTRIC IND SAS
Publication Date
2014-01-15

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Abstract

The invention provides a multi-color backlight realizing device which comprises a positive pole transmission line used for transmitting driving currents of one kind of frequency, first to nth light emitting units used for displaying first to nth colors of light respectively, first to nth passive filters used for outputting driving currents of first to nth frequencies respectively to switch on one of the first to nth light emitting units correspondingly, and a negative pole transmission line connected with second ends of the first to nth light emitting units, wherein each light emitting unit is provided with a first end and a second end, n is a natural number which is larger than 1, and each passive filter comprises an input end connected to the positive pole transmission line, an output end connected to the first end of one of the first to nth light emitting units correspondingly, and a grounding end connected with the negative pole transmission line. Compared with a prior multi-color backlight driving method, the multi-color backlight realizing method has the advantages that the number of transmission lines is reduced, the number and cost of electronic elements are reduced, the complexity of an electronic circuit is reduced, and the reliability of a backlight circuit is improved.
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Description

technical field

[0001] The present invention relates to a device and method for realizing multiple backlights, more specifically, to a device and method for realizing multi-color backlights by using a two-line transmission driving method. Background technique

[0002] Monochrome (that is, black and white) liquid crystal displays are still widely used in the industrial field due to their advantages such as high reliability and low power consumption. In order to allow users to see the displayed content clearly in a dark environment, we usually add a backlight to the display, and the user can turn on or off the backlight as needed.

[0003] figure 1 The backlight structure of the current liquid crystal display module is shown. figure 1 A shows the LCD with the backlight turned off; while figure 1 B shows the LCD with the backlight turned on.

[0004] figure 2 Shows the backlighting effect of a liquid crystal display.

[0005] Generally, the backlight source of a liquid c...

Claims

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