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Backlight suitable for display devices

A display device and backlight type technology, applied in the field of backlight sources, can solve problems such as light loss

Active Publication Date: 2012-04-18
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these solutions cause light loss due to scattering and absorption

Method used

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  • Backlight suitable for display devices
  • Backlight suitable for display devices
  • Backlight suitable for display devices

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0071] Figure 6 and Figures 7A-7C It can be used to compare the bulb hiding capability of the new back reflector laminate with that of the available white diffuse back reflector and the available specular back reflector. These figures were obtained using a Sharp 30" LCD TV with 10 bulbs, Model No. LC-30HV4V. The original TV had 12 CCFL bulbs and a white back reflector. For the purposes of these examples, the back reflector device to be modified. Figure 6 are digital images taken with a digital camera (Photometric Color CCD Light Measurement System of Radiant Imaging Co, (Duvall, Washington, USA)). The vertical lines show where the luminance distributions are obtained for three different back reflector areas, resulting in Figures 7A-7C .

[0072] Using the original TV, you can see the image of the CCFL bulb on the screen, which means that the brightness uniformity is poor, which is the case in Figure 6 the leftmost part of and Figure 7A shown in Figure 7A for along ...

example 2

[0076] This example shows that exemplary reflector stacks according to the present invention can improve brightness uniformity more effectively than conventional diffuse reflectors. The backlight in this example was a test bench with a 35mm bulb pitch and a 17mm cavity depth, which is close to a conventional 12 bulb based 32" liquid crystal digital television (LCDTV). The top film consists of a 2mm diffuser plate and is coated on DBEF with BEF prism on it (DTV).

[0077] With the exception of an exemplary reflector stack according to the invention (which is identical to the reflector stack in Example 1), the output luminance of diffuse reflective films including common diffuser films with different haze levels was tested in a test bench to be uniform degree of improvement. Diffusion films having haze levels of 35%, 45%, and 60% (measured by a Haze-gard Plus haze meter manufactured by BYK Gardner (Silver Spring, Maryland, USA)) were laminated to the ESR and tested on the ESR. ...

example 3

[0079] For this example, the clear layer was the same beaded diffuser used in Example 1 - a beaded diffuser "OPALUS BS-04" from Keiwa with a thickness of 140 μm on a 100 μm polyethylene terephthalate substrate, which The haze was 89.5% as measured with a Haze-gard Plus haze meter from BYK Gardner (Silver Spring, Maryland, USA). The clear layer was laminated to the ESR film using Optl pressure sensitive adhesive (PSA).

[0080] Three test stands with bulb spacing of 25mm, 30mm and 35mm were used. Different combinations of front films were used, including commercially available beaded diffuser (GD), DBEF (D400), BEF, and DBEF with BEF for LCD TVs. A standard white reflector and a back reflector laminate according to the invention were used as back reflectors. Figure 9 and Figure 10 Test results are shown comparing the performance of a back reflector laminate according to the invention ("Modified ESR") to that of a conventional white diffuse back reflector ("Standard White")...

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Abstract

A backlight suitable for use in a display device includes an illumination device having at least one light source and a back reflector stack including a reflective layer and a transparent layer having substantially uniform refractive index and having a plurality of light-directing protrusions disposed in a matrix array. The transparent layer is disposed between the reflective layer and the illumination device with the plurality of light-directing protrusions facing away from the reflective layer. The plurality of light-directing protrusions are configured and disposed in a configuration that is not registered to any light source of the illumination device.

Description

[0001] This application is a divisional application of the patent application with the application number 200780030913.6, the application date is August 7, 2007, and the invention title is "Backlight source suitable for display devices". technical field [0002] The present invention relates to a backlight suitable for a display device such as a liquid crystal display device, and more particularly to a backlight type display device. Background technique [0003] Display devices, such as liquid crystal display (LCD) devices, are used in a variety of applications including, for example, televisions, handheld devices, digital still cameras, video cameras, and computer monitors. Unlike conventional cathode ray tubes (CRTs), LCD panels are not self-illuminating and thus sometimes require a lighting assembly or "backlight". A backlight typically couples light from one or more light sources, such as cold-cathode fluorescent tubes (CCFTs) or light-emitting diodes (LEDs), onto the LC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13357G02B6/00F21S8/00F21V7/00F21Y101/02
CPCG02B5/128G02F1/133604G02F1/133606G02B6/0031G02B6/0046G02F2001/133607G02F1/133611G02F1/133605G02B6/0053G02F1/133607G02B5/126G02F1/1335
Inventor 马家颖奎因·D·桑福德程铭
Owner 3M INNOVATIVE PROPERTIES CO
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