WO2004055583A1

WO2004055583A1 - Front-lit display system

Info

Publication number: WO2004055583A1
Application number: PCT/CN2002/000895
Authority: WO
Inventors: Yijun He
Original assignee: Quanta Display Inc.; Quanta Display Japan Inc.
Priority date: 2002-12-17
Filing date: 2002-12-17
Publication date: 2004-07-01
Also published as: AU2002349563A8; AU2002349563A1

Abstract

This invention relates to an optical structure of front-lit modular, comprising of a display, an optical sheet, a reflector and a light source. It's characterized that there is plurality of parallel ridges in the one of surface of the optical sheet to reflect light ray down into display. Thus, improving effectiveness of light source and eveness of light ray and enhancing viewing angle of display are realized.

Description

Structure of optical mechanism of front light module TECHNICAL FIELD

The invention relates to a simple, quick and effective structure, which is a structure suitable for the optical mechanism of a front light module. The unique design on the optical substrate can be used to solve the most popular applications in the optoelectronic industry, such as liquid crystal displays. Make the image quality and brightness uniform, effectively use the light from the light source, and expand the viewing angle.

Background technique

FIG. 1A is an enlarged view of a known optical substrate design of a front optical module, which is from a side portion to a middle portion, and gradually becomes thinner from thicker, and the thickness is gradually decreased toward the middle portion in a stepwise manner. The pitch of one stage is about 20 to 30 micrometers (μπι), and the height of each stage drop is about 5 to 10 micrometers (m); Figure 1B shows the optical substrate of a known front optical module. The schematic diagram shows that the optical mechanism of the entire front light module has a thickness of about 5 to 6 inches.

Japanese Patent Publication No. 21883/2001 published on January 26, 2001. Reflective liquid crystal displays and mini-type information electronics products mainly explain the implementation of thin and lightweight reflective liquid crystal displays. Reflective liquid crystal displays are Between the glass substrates facing each other, there are a polarizing plate, a retardation plate, a diffusion plate, a color film, a transparent electrode, and a liquid crystal layer, which are sequentially arranged, and there is uneven unevenness on the glass substrate near the end of the viewer. To provide a light guide function of a front light. The front light includes a substrate near the user, and a light source disposed near the substrate of the user.

Japanese Patent Publication No. 00017/1990 published on January 5, 1990 and Japanese Patent Publication No. 84618/1990 disclosed on March 26, 1990 describe a planar light source unit including a light pipe (light Guide pope) is the first element, which has a light incident surface, a light emitting surface, the light emitting surface is orthogonal to the light incident surface, and a reflecting surface is directly opposite the light emitting surface, and a A light extraction mechanism is formed. The light extraction mechanism is also called a light extractor. The light source is located at the opposite end of the light pipe. control sheet) is a second element, and has a prism array, the prism array is arranged adjacent to the emission surface of the light pipe, and has a prism of triangle, and arranged so that the top end of the prism faces the light pipe to emit light Surface, the generating line formed by any of the prisms that make up the light pipe, is arranged almost parallel to the light source, and a reflecting sheet, or reflecting surface, is arranged adjacent to the light Light-reflecting surface of a catheter; a reference disclosed on March 26, 1990, Japanese Patent Publication No. 84618/1990, also discloses a uniform surface-roughening treatment on the light emission of the first element Surface (light emitting surface); in these two references, the light is scattered in a specific direction, but it is not satisfied with the actual optical characteristics, such as: satisfactory uniformity cannot be obtained from the light emitted from the light emitting surface (see Japanese Patent Publication No. 18879/1994 disclosed on January 28, 1994); in particular, there is no existing planar light source device, and a wide viewing angle is appropriately provided It is suitable for a planar light source unit as a liquid crystal display on a monitor television.

Known structures usually have the following four disadvantages: first, insufficient indoor brightness, second, limited viewing angle, third, insufficient brightness of the light emitting surface, and fourth, a single lamp.

Disclosure of invention

In view of this, the inventor of the present case proposes a simple, fast and effective structure, which is a structure suitable for the optical mechanism of a front light module. The unique design on the optical substrate can solve the current production of the most popular optoelectronic industry. Applications, such as liquid crystal displays, make the image quality and brightness uniform, effectively use the light from the light source, and expand the viewing angle.

The present invention proposes a simple, fast and effective structure, which is a structure suitable for the optical mechanism of a front light module. Using the unique design on the optical substrate, it can solve the most popular applications in the optoelectronic industry, such as liquid crystal displays. The main purpose is to make the image quality and brightness uniform, effectively use the light from the light source and expand the viewing angle: First, the present invention uses a ridge structure designed on the optical substrate to promote the light leaving from the optical substrate to deviate from the direction originally performed in the optical substrate, and has a larger diffusion range for improving The size of the perspective

Second, the present invention uses a valley structure designed on the optical substrate to promote the light emitted by the light source on one side of the optical substrate to enter the interior of the optical substrate, and to meet the surface of the valley to perform the internal full-scale operation. Reflection (internal total reflection), which reflects the light down to the reflector, and can improve the uniformity of the light emitted from the display;

Third, the present invention can effectively utilize the light emitted by the light source, and does not add too much volume and weight to the display.

Brief description of the drawings

FIG. 1A is an enlarged view of an optical substrate design of a known front light module.

FIG. 1B is a schematic diagram of an optical substrate of a known front light module.

Fig. 2 is an enlarged explanatory diagram of the structure of the first embodiment of the front optical module optical mechanism according to the present invention.

Fig. 3 is a structural explanatory diagram of a second embodiment of the structure of the optical mechanism of the front optical module of the present invention.

Fig. 4 is an enlarged structural explanatory view of a second embodiment of the structure of the optical mechanism of the front optical module of the present invention.

FIG. 5 is a structural explanatory diagram of a front optical module optical mechanism according to a second embodiment of the present invention.

FIG. 6 is an explanatory diagram of a light emitting principle of an optical mechanism of a front optical module according to a second embodiment of the present invention.

FIG. 7 is an external view of an optical mechanism of a front optical module according to a second embodiment of the present invention.

Best Practice for Implementing the Invention

First embodiment

FIG. 2 is an enlarged explanatory diagram of the structure of the first embodiment of the front optical module optical mechanism according to the present invention; the structure of the front optical module optical mechanism according to the first embodiment of the present invention is mainly composed of the following components: a display (not shown in the figure) 2), the display is composed of multiple pixels An optical substrate 1 having two major opposing surfaces, wherein one surface 12 is smooth, and Adjacent to the front major surface of the display; a reflector 3, the reflector 3 is disposed adjacent to the back major surface of the display; a light source 51, the light source 51 is used to direct light 7 The optical substrate 1 is introduced, in which the light 7 enters the optical substrate 1 from one side of the optical substrate 1, and because it encounters the surface of the valley portion 141a, it reflects downward due to internal total reflection and becomes light. 71. The light passes through the optical substrate 1, and then passes through the display, and is reflected by the reflector 3. The light passes through the display, enters the optical substrate 1, and then leaves the optical substrate 1. Thus, the optical substrate 1 enhances the brightness of the display.

The present invention is characterized in that the other surface 14 of the optical substrate 1 has a plurality of parallel valley portions 141a, 141b, 141c, 141d, 141e, 141f and ridge portions 143a, 143b. 143c, 145a. 145b, 145c, 145d and 145e, where the valley portion 141a and the valley portion 141b have a certain distance, as shown in FIG. 2, the valley portion 141b and the valley portion 141b

141c has a certain pitch, such as the pitch P2 shown in FIG. 2, and so on. Thus, the light 9 emitted from the light source 51 on one side of the optical substrate 1 enters the interior of the optical substrate 1, and encounters the valley 141a. The surfaces of 141b and 141c perform internal total reflection, so that light 7, respectively, becomes light 71, 73, 75 in turn, and the reflection reaches the reflector 3, which can improve the uniformity of the light emitted from the display, and then leave the optical base. The light 71 of the sheet 1 will pass through the ridge 145b of the optical substrate 1 and deviate from the direction originally performed in the optical substrate 1 to generate a larger diffusion range and deviate from the direction originally performed in the optical substrate 1. The size of the perspective.

The ridge 143a in the optical substrate 1 is composed of a first surface 143al of a multi-fold surface and a second surface 143a2 of a multi-fold surface, and the adjacent ridges 143a, 143b, and 143c constitute a ridge group (ridge group) 143, and the ridge groups 143 and 145, such as the ridge groups 143 and 145, may be occupied by one valley 141a, or Is occupied by a third surface 149 which is parallel to the smooth surface 12 of the optical substrate 1.

Explanation of the structure and function of the ridge 143a. Since the ridge 143a has two opposing surfaces, a first surface 143al of a poly-curved surface and a second surface 143a2 of a multi-curved surface, provided to leave the optical substrate 1 The light rays are separated from the direction originally performed in the optical substrate 1, and have a larger diffusion range, which is used to increase the viewing angle.

Explanation of the structure and function of the valley portion 141a. Since the valley portion 141a is a wedge-shaped surface, it is composed of a fourth surface 141al, a fifth surface 141a2, and a sixth surface 141a3. One side of the sheet 1, · The light 7 entering the optical substrate 1 is internally totally reflected, so that the light 7 is reflected downward to become the light 71, reaching the reflector 3, and the fifth surface 141a2 faces from the other side of the optical substrate 1. The light entering the optical substrate 1 (not shown in FIG. 2) is internally totally reflected, so that the light is reflected downward and reaches the reflector 3; since the valleys 141a, 141b, 141c, 141d, 141e, 141f, From the two sides to the middle, increase its longitudinal depth one by one; the reason for this design is that the light is emitted from both sides to the middle. In order to make the valleys 141c and 141d at the middle part, the surface is reflected when the internal total reflection is performed. The energy of the light can be equal to the valleys 141a and 141f on both sides. When the surface is totally internally reflected, the energy of the reflected light is uniform. Therefore, the valleys 141c and 141d in the middle are designed to have a depth greater than that on both sides. The valleys 141a and 141f are long in depth so as to intercept the valleys 141a and 141f on both sides. The surfaces of the valleys 141a and 141f are not intercepted by the light source 51 or 53 to the middle of the optical substrate 1, and the energy of the emitted light is further increased. Reflecting downward, the sixth surface 141a3 is parallel to the surface 12, which is mainly for facilitating the adjustment of the gap size, and also for the convenience of manufacturing and processing.

Further, the light source 51 on, in terms of position 53, may be provided on both sides of the optical substrate, the light source 511 comprises at least one light fixture (light tube) 511 and a reflector screen (reflective chimney) 513 ₀ and the light source 53 includes at least one light-emitting tube 531 and a reflector lamp cover 533. It should be noted that although the first embodiment of the present invention The light tube 511 represents the light source 51, and one light-emitting tube 531 represents the light source 53, but it is not limited to using a single light-emitting tube 511, 513. Multiple light-emitting tubes 511, 513 are still feasible in the first embodiment of the present invention.

The valley portion 141a and the valley portion 141b shown in FIG. 2 have a certain distance P1, and the valley portion

141b and valley 141c have a certain distance P2, and so on. The first embodiment of the present invention has a pitch of 50 to 70 micrometers (m).

Second embodiment

Fig. 3 is a structural explanatory diagram of a second embodiment of the structure of the optical mechanism of the front optical module of the present invention. Fig. 4 is an enlarged structural explanatory view of a second embodiment of the structure of the optical mechanism of the front optical module of the present invention. The second embodiment of the structure of the front optical module optical mechanism of the present invention is mainly composed of the following components:

A display (not shown in FIGS. 3 and 4), the display is composed of a plurality of pixels, and the pixels have a front and back major surface; an optical substrate 1, an optical substrate 1 It has two main opposing surfaces, one of which is a surface 12 which is smooth and abuts the main surface of the front end of the display; a reflector 3, which is disposed at a position adjacent to the main surface of the back end of the display; a light source 51, which is used by the light source 51 The light 7 is introduced into the optical substrate 1, where the light 7 enters the optical substrate 1 from one side of the optical substrate 1, and because it encounters the surface of the valley portion 141a, it reflects downward and reflects due to internal total reflection, and becomes The light 71 passes through the optical substrate 1 and then passes through the display and is reflected by the reflector 3, returns to the display, enters the optical substrate 1, and then leaves the optical substrate 1. Thus, the optical substrate 1 enhances the brightness of the display.

The present invention is characterized in that: the other surface 14 of the optical substrate 1 has a plurality of parallel valley portions 141a, 141b, 141c, 141d, 141e, 141f and ridge portions 143a, 143b, 143c, 145a, 145b, 145c, 145d and 145e, where the valley portion 141a and the valley portion 141b have a certain distance, as shown in FIG. 3, the valley portion 141b and the valley portion

141c has a certain pitch, as shown in the pitch P2 shown in FIG. 3, and so on. Thus, the light 9 emitted from the light source 51 on one side of the optical substrate 1 enters the inside of the optical substrate 1. The surface of the valleys 141a, 141b, and 141c, and internal total reflection is performed, so that the light 7 becomes the light 71, 73, and 75, respectively, and the reflection is downward to reach the reflector 3, which can enhance the light emitted from the display. Uniformity, and then, the light 71 leaving the optical substrate 1 will pass through the ridge 145b of the optical substrate 1 and deviate from the direction originally performed in the optical substrate 1 to generate a larger diffusion range and deviate from the optical substrate 1. The direction of the film 1 increases the size of the viewing angle.

The ridge 143a in the optical substrate 1 is composed of a first surface 143al and a second surface 143a2, and the adjacent ridges 143a, 143b, and 143c form a ridge group 143, and the ridge groups 143 and 145 For example, the ridge groups 143 and 145 may be occupied by a valley 141a or a third surface 149, and the third surface 149 is a smooth surface 12 parallel to the optical substrate 1.

Explanation of the structure and function of the ridge 143a. Since the ridge 143a has two opposite surfaces, a first surface 143al and a second surface 143a2, respectively, it is to provide the light leaving the optical substrate 1 and separate from the original optical substrate. 1 with the larger diffusion range, which is used to increase the viewing angle.

Description of the structure and function of the valley portion 141a. Since the valley portion 141a is composed of a fourth surface Mlal and a fifth surface 141a2, the fourth surface 141a1 enters the optical substrate 1 from one side of the optical substrate 1. The light beam 7 is totally internally reflected, so that the light beam 7 is reflected downward into the light beam 71 and reaches the reflector 3. The fifth surface 141a2 is a light beam entering the optical substrate 1 from the other side of the optical substrate 1 (not shown in the figure). 3 and Figure 4), for internal total reflection, the light is reflected downward to the reflector 3; since the valleys 141a, 141b, 141c, 141d, 141e, 141f are gradually increased from both sides to the middle, Its longitudinal depth; the reason for this design is that the light is emitted from both sides to the middle. In order to make the valleys 141c and 141d at the middle part of the surface perform internal total reflection, the energy of the reflected light can be The valley portions 141a and 141f of the inner portion have uniform energy of the reflected light when the surface is totally internally reflected. Therefore, the valley portions 141c and 141d of the middle portion are designed to have a depth greater than that of the valley portions 141a and 141f on both sides. To intercept the sides Department 141a and 141f, which are not intercepted on the surface, are transmitted from the light source 51 or 53 to the middle of the optical substrate 1, and the energy of the emitted light is further reflected downward.

In addition, as for the positions of the light sources 51 and 53, the light sources 51 and 53 may be disposed on both sides of the optical substrate 1. The light source 51 includes at least one light emitting tube 511 and a reflection lamp cover 513, and the light source 53 includes at least one light emitting tube. 531 and a reflective lampshade 533. It should be noted that although the second embodiment of the present invention uses a light-emitting tube 511 as the light source 51 and a light-emitting tube 531 as the light source 53, it is not limited to using a single light-emitting tube 511, 513. The plurality of light emitting tubes 511 and 513 are still feasible in the second embodiment of the present invention.

The valley portion 141a and the valley portion 141b shown in Figs. 3 and 4 have a certain distance.

Pl, and the valley portion 141b and the valley portion 141c have a certain pitch P2, and so on. In the second embodiment of the present invention, the pitch is between 50 and 70 microns (μm).

5 is a structural explanatory diagram of a front optical module optical mechanism according to a second embodiment of the present invention; the structure of the valley portion 141a is symmetrical to the middle portion of the front optical module optical mechanism; the valley portions 141a, 141b, 141c, Hid, 141e, 141f , Is from the two sides to the middle, and gradually increase its longitudinal depth. The reason for this design is that the light is emitted from both sides to the middle. In order for the valleys 141c and 141d at the middle to be internally totally reflected, the energy of the reflected light can be compared with the valleys on both sides. 141a, 141f, when the surface is totally internally reflected, the energy of the reflected light is uniform, so the valleys 141c and 141d in the middle part are designed to have a depth greater than the depths of the valleys 141a and 141f on both sides so as to intercept both sides The valley portions 141a and 141f of the part are not intercepted by the surface, and the energy of the emitted light is transmitted from the light source 51 or 53 to the middle of the optical substrate 1, and then is reflected downward.

FIG. 6 is an explanatory diagram of a light emitting principle of an optical mechanism of a front optical module according to a second embodiment of the present invention. A light source 51 is used to introduce light 7 into the optical substrate 1, where the light 7 enters the optical substrate 1 from one side of the optical substrate 1, and because it encounters the surface of the valley 141a, it is totally reflected internally. Reflected downward, it becomes light 71, passes through the optical substrate 1, and then passes through the display, and is reflected by the reflector 3, and returns to the display and enters the optical substrate 1. A part of the reflected light 71 passes through the optical Spine of substrate 1 After 143a, detachment from the direction originally performed in the optical substrate 1 produces a larger diffusion range, detachment from the direction originally performed in the optical substrate 1, and increases the size of the viewing angle.

FIG. 7 is an external view of an optical mechanism of a front optical module according to a second embodiment of the present invention. The valley and ridges of the optical substrate can be seen from FIG. 7, which are symmetrical to the middle portion of the optical mechanism of the front optical module and are oriented from both sides. Symmetrically arranged in the middle.

The drawings and descriptions disclosed above are only the preferred embodiments of the present invention, and are not intended to limit the implementation of the present invention. Any person familiar with the art may make changes or modifications based on the spirit of the present invention. Should be covered by the following claims of the present invention.

Industrial applicability

The simple, fast and effective structure proposed by the present invention is a structure suitable for the optical mechanism of a front light module. Using the unique design on the optical substrate, it can solve the applications currently produced by the most popular optoelectronic industry, such as liquid crystal displays. Its image quality and brightness are uniform, effectively using the light from the light source and expanding the viewing angle.

Claims

Rights request

1. The structure of the optical mechanism of the front light module includes:

A display, the display is composed of a plurality of pixels, and the pixel has a main surface of a front end and a back end;

An optical substrate, the optical substrate having two main opposite surfaces, one of which is smooth and adjacent to the position of the main surface of the front end of the display;

A reflector disposed at a position adjacent to the main surface of the back end of the display; and

A light source for introducing light into the optical substrate, wherein the light enters the optical substrate from both sides of the optical substrate, and because it encounters the surface of the valley, the internal total reflection is reflected downward through the The optical substrate then passes through the display and is reflected by the reflector, returns through the display, enters the optical substrate, and then leaves the optical substrate, whereby the optical substrate enhances the brightness of the display;

It is characterized by:

The other surface of the optical substrate has a plurality of parallel ridges and valleys, wherein the valleys and the valleys have a certain distance; thus, the light emitted by the light sources on both sides of the optical substrate enters the optical substrate. The inside of the sheet meets the surface of the valley and performs internal total reflection, so that the light is reflected downward and reaches the reflector to improve the uniformity of the light emitted from the display; then, the light leaving the optical substrate, After passing through the ridges of the optical substrate, the direction of the optical substrate is removed from the original direction, resulting in a larger diffusion range and increasing the viewing angle.

2. The structure of the front optical module optical mechanism according to claim 1, wherein each ridge is composed of a first surface and a second surface, and adjacent ridges constitute a ridge group, and between the ridge groups, It can be occupied by a third surface or a valley.

3. The structure of the front optical module optical mechanism according to claim 1, wherein the first surface and the second surface provide light leaving the optical substrate and deviate from a direction originally performed in the optical substrate, It has a larger diffusion range and is used to increase the viewing angle.

4. The structure of the front optical module optical mechanism according to claim 1, wherein the third surface is parallel to a smooth surface of the optical substrate.

5. The structure of the front optical module optical mechanism according to claim 1, wherein the valley portion is composed of a fourth surface and a fifth surface, and the fourth surface pair enters the optical from one side of the optical substrate. The light of the substrate is totally internally reflected, so that the light is reflected downward and reaches the reflector; the fifth surface performs internal total reflection of the light entering the optical substrate from the other side of the optical substrate Therefore, the light is reflected downward to reach the reflector.

6. The structure of the optical mechanism of the front light module according to claim 1, wherein the valley portion increases its longitudinal depth one by one from two sides to the middle.

7. The structure of the optical mechanism of the front light module according to claim 1, wherein the light source is disposed on both sides of the optical substrate, and comprises: at least one light emitting tube and a reflection lamp cover.

8. The structure of the front optical module optical mechanism according to claim 1, wherein the pitch is between 50 and 70 microns.