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Light source apparatus and liquid crystal display apparatus

A technology of light source device and light source part, applied in the direction of light source, electric light source, point light source, etc., can solve the problem of uneven brightness, and achieve the effect of reducing the number and expanding the gap interval

Inactive Publication Date: 2014-03-19
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Patent Document 1 adopts a method of suppressing streak-like brightness unevenness. In a direct-type LED backlight, the shadows generated by the pillar portion of the optical lens and its adhesive resin blocking the light from the light-emitting element overlap each other. overlap, which causes the above-mentioned uneven brightness in the form of ribs, but the light diffusion lenses used are all the same

Method used

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  • Light source apparatus and liquid crystal display apparatus
  • Light source apparatus and liquid crystal display apparatus
  • Light source apparatus and liquid crystal display apparatus

Examples

Experimental program
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Effect test

Embodiment approach 1

[0079] figure 1 It is a plan view schematically showing an example of the arrangement of LED modules of the LED light source device in Embodiment 1 of the present invention.

[0080] exist figure 1 Among them, the LED light source device 1 of Embodiment 1 is composed of a plurality of LED modules 2, and usually has multiple rows, but here, for convenience, five rows are arranged in the lateral direction, and each row is arranged with two rectangular modules on the left and right. In addition, among the rectangular LED modules 2 of 5 rows in the horizontal direction, in order to improve the brightness of the central part of the screen, although not explicitly shown here, the rectangular LED modules 2 of 3 rows in the center are arranged so that The longitudinal arrangement gaps are tight, and the LEDs 4 on the central side are relatively close.

[0081] Each LED module 2 has a printed wiring board surface 3, and a plurality (here, five) of LEDs 4 connected in series mounted...

Embodiment approach 2

[0104] In the first embodiment described above, the case where a plurality of light source units are arranged in a matrix form in the row direction and the column direction in plan view is described, and luminance peaks are alternately arranged for each row and each column. A light source unit with a high contrast ratio between light and dark and a light source unit with a low peak brightness and a small contrast difference between light and dark are described. In the case of a high light source unit with a narrow light distribution angle (light directivity) and a light source unit with a low luminance peak and a wide light distribution angle (light directivity).

[0105] That is, compared with the case of the first embodiment described above, the point of difference is that in the first embodiment described above, the light source unit with a high luminance peak value and a large contrast difference between light and dark and the light source unit with a low peak luminance val...

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Abstract

Uneven brightness of a surface light source is inhibited and display quality of the surface light source is improved. An LED module (2A), having one or multiple light source units with high peak brightness value and large light and dark contrast difference, and an LED module (2B), having one or multiple light source units with low peak brightness value and small light and dark contrast difference, are arranged alternately. The one or multiple light source units have white resists (6A, 6B) as a reflective material provided above a substrate area (the substrate area being directly below a light diffusion lens (5)) surrounding an LED (4), and the light source unit with high peak brightness value and large dark and light contrast difference and the light source unit with low peak brightness value and small dark and light contrast difference are configured according to the difference in reflectivity between the white resists (6A, 6B). Consequently, the luminance distribution (light and dark contrast) from the light diffusion lens (5) is deliberately adjusted and controlled according to the reflectivity difference between the white resists (6A, 6B), a light section (8) and a dark section (7) are cancelled out, and uneven brightness is significantly inhibited.

Description

technical field [0001] The present invention relates to a light source device using a plurality of LED modules, etc., and a liquid crystal display device using the light source device as a backlight, wherein a plurality of light emitting diodes (LEDs) are mounted in the LED module as a light source unit. Background technique [0002] Such a conventional liquid crystal display device includes a transmissive liquid crystal panel, and a backlight is provided behind the transmissive liquid crystal panel. Conventionally, CCFL (Cold Cathode Fluorescent Lamp) has been the mainstream of light source devices used as backlights. However, with the advancement of LED technology in recent years, LEDs are expected to be used instead of CCFLs as light sources. [0003] Patent Document 1 adopts a method of suppressing streak-like brightness unevenness. In a direct-type LED backlight, the shadows generated by the pillar portion of the optical lens and its adhesive resin blocking the light fr...

Claims

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Application Information

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IPC IPC(8): F21S2/00G02F1/13357F21Y101/02
CPCF21V7/22G02F1/133606F21V13/04G02F1/133611G02F1/133603F21K9/50F21K9/60F21V7/24
Inventor 高濑干竹村英夫
Owner SHARP KK
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