Side-light type backlight source and drive method thereof

Abstract

The invention provides side-light type backlight source and drive method thereof. The backlight source comprises a circuit board, point light sources arranged in rows and a wire outgoing terminal, wherein all point light sources in a row are divided into at least two groups, and the point light sources of other groups are respectively arranged among the light sources in each group; and the point light sources in each group are mutually connected in series and connected to the wire outgoing terminal so as to connect with a drive circuit. The method is used for driving the side-light type backlight source and comprises the following step of: driving at least one group of point light sources connected in series in a row to lighten by the drive circuit according to image information. The point light sources connected in series in each group of the side-light type backlight source are arranged at intervals with the point light sources to ensure that the brightness finally presented in a pixel region by the backlight source is uniform. In the invention, the on-off of the point light sources of each group can be respectively controlled, thus the brightness control magnitude order of the backlight source can be increased, and the service life of the side-light type backlight source can also be prolonged.

Description

technical field [0001] The invention relates to a backlight source technology of a liquid crystal display, in particular to an edge-light backlight source and a driving method thereof. Background technique [0002] Due to the non-self-luminous properties of liquid crystal molecules, many liquid crystal displays need to be provided with a backlight source. Light Emitting Diode (hereinafter referred to as: LED) has been widely recognized as a green and environmentally friendly clean light source. LED has a long service life, energy saving, simple and convenient application. These outstanding advantages make LED have a broader market. In the future, the Cold Cathode Fluorescent Lamp (Cold Cathode Fluorescent Lamp; CCFL for short) will gradually be replaced as the backlight source of the liquid crystal display. [0003] According to the setting method of the backlight, it can be divided into direct type and side-light type. The so-called side-light type backlight means that LED...

AI Technical Summary

Problems solved by technology

[0004] However, the edge-lit backlight of the prior art has the following defects: each LED group is controlled by a constant voltage, and due to the space limitation on the light bar, the outlet terminals can only be arranged at one or both ends of the circuit board, and each series connection The distance between the LED group and the power supply is not equal, so the voltage drop will cause the LED group near the power supply end to be brighter than the LED group far from the power supply end, and the brightness will gradually change in the pixel area corresponding to the LED; on the other hand, based on the above In the constant current or constant voltage driving mode, when adjusting the LED brightness of the traditional light bar structure, all the LED groups will be adjusted together, and it is impossible to perform dynamic control while satisfying the uniformity of the backlight source, and the brightness of the backlight source cannot be changed.

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