GB2419019A

GB2419019A - LCD Backlight

Info

Publication number: GB2419019A
Application number: GB0422474A
Authority: GB
Inventors: Wen-Pao Tseng; Hsin-Chien Chiang
Original assignee: K Bridge Electronics Co Ltd
Current assignee: K Bridge Electronics Co Ltd
Priority date: 2004-10-08
Filing date: 2004-10-08
Publication date: 2006-04-12
Also published as: GB0422474D0

Abstract

An LCD light source projection construction has light emitters (20) evenly distributed in a cavity (60) which is integrated with a light permeable layer (61) to be adhered with optical film (30). Multiple dimmers (611) (see fig 3) are disposed on and integrated with the light permeable layer (61) to create reflection and deflection for light beams passing through so as to consistently present light source from each light emitter (20) thereby permitting the omission of a diffuser, simplifying LCD configuration and effectively reducing LCD thickness.

Description

TITLE: LCD LIGHT SOURCE PROJECTION CONSTRUCTION The present invention

relates to an improved construction of light source projection in an LCD, and more particularly to a simplified LCD configuration and to effectively reduce the thickness of the LCD.

Fig. I shows a schematic view of a basic configuration of an LCD generally available on the market and a light source projection configuration of the prior art.

The LCD has multiple light emitters 20 evenly distributed in a reflector mask 10; an optical film 30 comprised of a lower diffuser, a prism, and a polarizer (or the 0 upper diffuser) disposed in sequence at an opening provided on the reflector mask 10; and a liquid crystal panel 40 to present the performance effects of light sources from the light emitters 20.

The reflector mask 10 is essentially used to project all the light sources from the light emitters 20 in the direction leading to the liquid crystal panel 40 so as to maintain consistent luminance on each part of the liquid crystal panel 40.

However, in practice, the location of the light emitters 20 is closer to the liquid crystal panel 40 than to the reflector mask 10 resulting in that most of the light source from each light emitter 20 directly projects towards the direction of the liquid crystal panel 40 to produce bright stripes thereon at the locations of each light emitter 20.

As a result, a diffuser 50 is interposed between the reflector mask 10 and the optical film 30 to facilitate the light beams passing through the diffuser 50 which are diffused first before being projected in the direction leading to the liquid crystal panel 40 to eliminate those bright stripes created by each light emitter 20.

However, the addition of the diffuser 50 complicates the constituent members of the LCD as a whole and thickens the LCD to frustrate attempts at making a compact LCD.

The primary aim of the present invention is to provide an improved construction for the light source projection of an LCD that omits the installation of a diffuser, simplifies the configuration of the LCD and effectively makes the LCD thinner. To achieve this aim, the LCD gives the light source performance effects through an optical film and a liquid crystal panel in terms of the basic

J - 2

configuration of the LCD; wherein, multiple light emitters are evenly distributed in a cavity; the cavity is integrated with a light permeable layer to be adhered with the related optical film; multiple dimmers are integrated with the light permeable layer to deflect and reflect light beams passing through it to consistently present the light source from the light emitter.

The invention will now be described in detail, by way of example, with reference to the drawings, in which: Fig. 1 is a schematic view showing a light source projection configuration of

the prior art in an LCD;

lo Fig. 2 is a schematic view showing a light source projection configuration of the present invention; Fig. 3 is a schematic view showing a dimmer of a first embodiment of the present invention; Fig. 4 is a magnified view of a dimmer construction of a second embodiment of the present invention; Fig. 5 is schematic view showing the dimmer construction of the second embodiment of the present invention; Fig. 6 is schematic view showing a dimmer construction of a third preferred embodiment of the present invention; Fig. 7 is schematic view showing the installation of a dimmer of a fourth embodiment of the present invention; and Fig. 8 is schematic view showing the installation of a dimmer of a fifth embodiment of the present invention.

Referring to the drawings, the basic configuration of an LCD in an LCD light source projection construction of the present invention as illustrated in Fig. 2 includes an optical film 30 comprised of a lower diffuser, a prism, a polarizer (or an upper diffuser), and a liquid crystal panel 40 to present performance effects of light sources from multiple light emitters 20.

The light emitters 20 are evenly distributed in a cavity 60 made of transparent material and integrated with a light permeable layer 61 to be adhered with the optical film 30. The light permeable layer 61 is integrated with multiple dimmers 611. As illustrated in Figs. 3 and 5, these dimmers 611 are made in the form of arc channels (e.g., in V or U shape as illustrated in Fig. 5), or arc ribs (in U or V shape as illustrated in Fig. 6) on the surface of the light permeable layer 61; or comprised of multiple concave and convex points by means of laser, casting, cutting, sandblasting, printing, etching, or meshed so to deflect and reflect the light beams passing through the light permeable layer 61, thus to consistently present the light source from each light emitter 20.

These light emitters may be distributed in a pattern of continuous curves in the cavity 60 as illustrated in Figs. 7 and 8. Accordingly, those dimmers 611 are arranged on those linear channels or ribs formed on the surface of the light lo permeable layer 60 to achieve the same light dimming results. The dimmers 611 may be arranged at a continuously or noncontinuously fixed spacing with the spacing subject to readjustment depending on the arrangement density of the light emitters 20. The dimmers 611 may be arranged vertically so as to deliver the consistent light results by even distribution of the light sources as illustrated in Fig. 7. As the light emitters 20 are more collectively arranged, the general luminance of the light sources among the light emitters 20 is comparatively higher to justify the comparatively sparse arrangement of the dimmers 611.

Alternatively, the denser and non-transparent dimmers are printed at the section where provided with higher luminance of light sources to eliminate certain light ho beams giving way to the evenly distributed light sources for reducing the difference between brighter and darker areas. When the light emitters 20 are arranged at a greater spacing as illustrated in Fig. 8, dimmers 611 located further from the light emitters 20 are arranged more intensively, or non-transparent dimmers are printed over light emitters to further effectively allocate light beams from the light sources.

Furthermore, as illustrated in Fig. 6, light permeable material is distributed in the cavity integrated with multiple dimmers. Therefore, the bright stripes created by each light emitter 20 can be effectively eliminated whether the light emitters 20 are arranged in dot, straight rod or even in the fashion featuring continuous curves.

The present invention by omitting the installation of any diffuser, simplifying the configuration of the LCD; effectively reducing the thickness of the LCD; and - 4 complying with compact design appeals of the LCD provides an improved LCD projection construction. However it is to be noted that the preferred embodiments disclosed in the specification and the accompanying drawings are not limiting the present invention. Therefore, any construction, installation, or characteristic that is the same or similar to that of the present invention should fall within the scope of the purposes of the present invention as claimed in the claims. - s -

Claims

1. An LCD light source projection construction having multiple light emitters evenly distributed in a cavity; wherein the cavity is integrated with a light permeable layer and multiple dimmers are integrated with the light permeable layer whereby light beams passing through the light permeable layer are deflected and reflected to consistently present light source from each light emitter.

lo

2. An LCD light source projection construction according to Claim 1, wherein the dimmers are comprised of linear channels or ribs formed on the surface of the light permeable layer.

3. An LCD light source projection construction according to Claim 1, wherein the dimmers are comprised of arc channels or ribs on the surface of the light permeable layer.

4. An LCD light source projection construction according to Claim 2 or Claim 3, wherein the channels or ribs are each made in U or V shape.

5. An LCD light source projection construction according to any one of the preceding Claims, wherein the dimmers are comprised of multiple concave and convex points formed on the surface of the light permeable layer.

6. An LCD light source projection construction according to Claim 5, wherein the concave and convex points are formed by means of laser, casting, cutting, sandblasting, printing, etching or meshed.

7. An LCD light source projection construction according to any one of the preceding Claims, wherein spacing among multiple dimmers can be in a continuous fashion or not. - 6

8. An LCD light source projection construction according to any one of the preceding Claims, wherein the cavity is made of light permeable material and a reflector is provided on the bottom of the cavity.

9. An LCD light source projection construction substantially as described herein with reference to the drawings.