Unlock instant, AI-driven research and patent intelligence for your innovation.

Planar light source unit and liquid crystal display device equipped with the same

A planar light source and light source technology, applied in optics, nonlinear optics, instruments, etc., to achieve the effect of alleviating the decrease in brightness

Inactive Publication Date: 2016-01-06
SHARP KK
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As described above, it is conceivable that by adjusting the interval of the LED board 102 to partially change the arrangement density of the LEDs, it is possible to easily deal with the size variation of the lighting device 100

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Planar light source unit and liquid crystal display device equipped with the same
  • Planar light source unit and liquid crystal display device equipped with the same
  • Planar light source unit and liquid crystal display device equipped with the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Embodiment 1 of the present invention is described below with reference to the drawings. Meanwhile, there are cases where a structure common to each embodiment is denoted by the same part number, and description thereof is omitted.

[0053] Figure 1A is a cross-sectional view showing a schematic structure of a liquid crystal display device 1 according to the present invention, and Figure 1B is a plan view of the backlight 3 of the liquid crystal display device 1 . At the same time, in Figure 1B In , for the sake of convenience, descriptions of the diffusion plate 15 and the optical sheet 16 to be described later are omitted. As shown in these drawings, a liquid crystal display device 1 has a liquid crystal panel 2 and a backlight 3 .

[0054] The liquid crystal panel 2 is a liquid crystal display element that modulates light supplied from the backlight 3 to display images, and is constituted by sandwiching a liquid crystal layer between a pair of panels. One boa...

Embodiment 2

[0098] Embodiment 2 of the present invention is described below with reference to the drawings.

[0099] Figure 9 is a plan view of the backlight 3 according to the present embodiment. At the same time, in Figure 9 In , the illustration of the diffusion plate 15 and the optical sheet 16 is skipped for the sake of convenience. In this embodiment, instead of tilting the LEDs 12 provided in each corner region P1 of the rectangular region RA in the structure according to Embodiment 1, the diffusion lens 14 corresponding to the above-mentioned LEDs 12 is shifted relative to the LEDs 12 . In more detail, the diffusion lens 14 corresponding to the LED 12 is provided in each corner area P1 so that its central axis C is inclined toward the outer peripheral side of the rectangular area RA, especially relative to the light emitting portion 12a of the LED 12 toward the four corners of the rectangular area RA. Each vertex is sloped.

[0100] At the same time, in Figure 9 In , the a...

Embodiment 3

[0111] Embodiment 3 of the present invention is described below with reference to the drawings.

[0112] Figure 15 is a plan view of the backlight 3 according to the present embodiment. At the same time, in Figure 15 In , the illustration of the diffusion plate 15 and the optical sheet 16 is skipped for the sake of convenience. In this embodiment, instead of tilting the LEDs 12 located in each corner area P1 of the rectangular area RA in the structure according to Embodiment 1, the diffusion lens 14 corresponding to the LEDs 12 described above is tilted and arranged. In more detail, the diffusion lens 14 corresponding to the LED 12 in each corner area P1 is arranged so that its central axis C is perpendicular to the mounting surface 11a 1 The direction of (the bottom plate 11 a ) is inclined toward the outer peripheral side of the rectangular area RA, in particular, inclined toward each of the vertices of the four corners of the rectangular area RA. Furthermore, in the p...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

In the present invention, a backlight (3) serving as a planar light source unit is equipped with: multiple LEDs (12); and a bottom plate (11a) having a mounting surface (11a1). The multiple LEDs (12) are two-dimensionally arranged on the mounting surface (11a1) within a rectangular area (RA) that is smaller than the bottom plate (11a). In addition, the arrangement density of the LEDs in the rectangular area (RA) is lower at the center part (Rc) than at the peripheral part (Rp). The rectangular area (RA) has a corner area, where at least one LED (12) is provided, at each of the four corners thereof. The LEDs (12) positioned in the respective corner areas are installed such that the central axes of the LEDs lean toward the periphery side of the rectangular area (RA) with respect to the direction perpendicular to the mounting surface (11a1).

Description

technical field [0001] The present invention relates to a planar light source device in which a plurality of light sources are two-dimensionally arranged in a rectangular area on a mounting surface, and also relates to a liquid crystal display device including the planar light source device. Background technique [0002] Conventionally, a so-called direct type irradiating device has been proposed as a planar light source device for irradiating a liquid crystal panel, which is provided just below the rear surface of the liquid crystal panel. As a light source for thus illuminating the device, it is possible to use a tubular light source (eg, cold cathode lamp) as in Patent Documents 1 to 3 or a point light source (eg, LED (Light Emitting Diode)) as in Patent 4. In particular, LEDs are advantageous in terms of long life and low power consumption, and in recent years, many LEDs are used as light sources for illuminating devices. [0003] At the same time, when humans look at t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/13357
CPCG02F1/133603G02F1/133606G02F1/133611G02F1/133607
Inventor 酒井宏仁
Owner SHARP KK