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Backlight unit

A technology of backlight unit and light source, applied in the direction of optical components, optics, light source, etc., to achieve the effect of stable lighting action

Inactive Publication Date: 2013-03-27
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, although not shown in the figure, a reflective sheet, an optical sheet, and the like are accommodated inside the backlight frame 103 .

Method used

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0039] First, refer to Figure 1 ~ Figure 4 The structure of the backlight unit of the first embodiment and a liquid crystal display device including the backlight unit will be described.

[0040] Such as figure 1 As shown, in the liquid crystal display device including the backlight unit 10 of the first embodiment, the backlight unit 10 is used in a state of being installed on the rear side of the liquid crystal display panel 50 . Furthermore, the backlight unit 10 of the first embodiment irradiates the liquid crystal display panel 50 with planar light from the rear side of the liquid crystal display panel 50 . The configuration of the backlight unit 10 of the first embodiment will be described in detail below.

[0041] Such as figure 1 and figure 2 As shown, the backlight unit 10 of the first embodiment includes at least a backlight frame 1 , a reflection sheet 2 , a light guide plate 3 , a light source composed of a plurality of LEDs (Light Emitting Diodes) 4 , and a...

no. 2 approach

[0068] Below, refer to Figure 6 and Figure 7 The structure of the backlight unit of the second embodiment will be described.

[0069] Such as Figure 6 As shown, the light source of the backlight unit of the second embodiment is composed of a plurality of LEDs (Light Emitting Diodes) 31 . Although not shown in the figure, the plurality of LEDs 31 are arranged in a row at predetermined intervals in the direction A (direction along the light incident surface of the light guide plate) as in the above-mentioned first embodiment. The light incident surfaces of the light guide plate are opposite to each other. In addition, a plurality of LEDs 31 are mounted on the same LED substrate 32 .

[0070] Here, in the second embodiment, the plurality of LEDs 31 are classified into four LED groups 31a to 31d. The four LED groups 31a to 31d each include a predetermined number of LEDs 31 connected in series. And the four LED groups 31a-31d are arrange|positioned so that the LED 31 conta...

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PUM

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Abstract

A backlight unit that realizes stabilization of lighting operation in the event of carrying out lighting operation at low luminance. The backlight unit is backlight unit (10) comprising a light source composed of multiple light emitting diode groups (4a, 4b, 31a, 31b, 31c, 31d) each including a given number of serially connected light emitting diodes (4,31); and lighting circuit (20, 40) for lighting the light source in accordance with a light control signal. The lighting circuit has at least multiple drive circuit portions (21a, 21b, 41a, 41b, 41c, 41d) respectively connected to the multiple light emitting diode groups, and in accordance with a light control signal, allows all the light emitting diodes included in each of the multiple light emitting diode groups to emit light, or allows only light emitting diodes included in light emitting diode group(s) selected from among the multiple light emitting diode groups to emit light.

Description

technical field [0001] The present invention relates to a backlight unit, and more particularly to a backlight unit using a plurality of light emitting diodes as light sources. Background technique [0002] Conventionally, an LED drive device for driving a plurality of LEDs (light emitting diodes) connected in series is known (for example, refer to Patent Document 1). In addition, a backlight unit including the above-mentioned LED driving device and the like is conventionally known. [0003] Figure 9 It is a plan view schematically showing an example of the structure of a conventional backlight unit. Figure 10 is for illustration Figure 9 A diagram showing the structure of a light source of a conventional backlight unit. Figure 11 is for illustration Figure 9 A diagram showing the structure of a conventional lighting circuit connected to a light source of a backlight unit. First, refer to Figure 9 ~ Figure 11 An example of the structure of a conventional backlight ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
CPCG02B6/0068G02B6/0083G02B6/0073G09G2320/0626G09G3/342
Inventor 滨田哲也
Owner SHARP KK