KR100894836B1 - Light guide plate and display apparatus using it - Google Patents

Abstract

Disclosed are a light guide plate and a display device using the same. According to an embodiment of the present invention, a light guide plate for reflecting input light in a zigzag and traveling in a predetermined direction, the light guide plate comprising: an enlarged area for generating an enlarged light by enlarging a length in a first axial direction of the input light; And a condensing area for condensing a length in a second axis direction orthogonal to the first axis direction of the enlarged light to one focal point outside the light guide plate and converting the light into linear light. According to the present invention, by collimating, expanding and condensing the light emitted from the light source by a single light guide plate, the size and volume thereof can be reduced, thereby miniaturizing the optical system or the display device.

Display devices, light sources, light guide plates, light modulators.

Description

Light guide plate and display apparatus using it

The present invention relates to a display device, and more particularly, to a light guide plate and a display device using the same.

Recently, various apparatuses and methods for efficiently concentrating a beam emitted from a light source have been proposed while a photographing apparatus and a projection system are further miniaturized. In particular, as the technology of embedding a projection or photographing device inside a small communication device is further developed, an improvement in light collection efficiency has emerged as an important problem.

Conventionally, in order to exhibit such light collecting performance, a method of combining a plurality of lenses for constant refraction of light projected onto the X-axis and the Y-axis is used. However, attempts to improve the light condensing performance using multiple lenses do not meet the recent trend of miniaturization of optical devices. That is, there is a problem in the manufacture of the product, there is a problem that the energy loss is large while the beam passes through a plurality of lenses and air layers. In addition, the use of multiple lenses in a small projection system has a problem of lowering precision even in the manufacturing process.

Accordingly, the present invention provides a light guide plate capable of maximizing the condensing efficiency and improving the illuminance uniformity of the converted one-dimensional beam in converting (condensing) the two-dimensional beam emitted from the light source into the one-dimensional beam; Provided is a display device using the same.

In addition, the present invention is achieved by collimating, expanding and condensing the light emitted from the light source by a single united light guide plate to reduce the size and volume of the display device to reduce the size of the optical system and a display device using the same To provide.

In addition, the present invention provides a light guide plate and a display device using the same, which can be applied to a small digital device such as a mobile phone and a PMP as well as a large display device by simplifying the configuration of the display device and reducing the volume of the manufactured optical device.

Other objects of the present invention will be readily understood through the following description.

According to one aspect of the invention, the light guide plate for reflecting the input light in a zigzag (zgzag) to advance in a predetermined direction, comprising: an enlarged region for expanding the length of the input light in the first axis direction to generate an enlarged light; And a condensing region for condensing a length in a second axial direction orthogonal to the first axial direction of the enlarged light to one focal point outside the light guide plate and converting the converted light into linear light.

The light guide plate may include a first reflecting surface and a second reflecting surface which are disposed to face the input light in a zigzag manner, and the enlarged area and the condensing area may be the first reflecting surface or the reflecting area, respectively. It may be formed on the second reflective surface.

Here, the enlarged area may be implemented as two curved surfaces having curvatures in the first axial direction, which are separately disposed on the first reflecting surface and the second reflecting surface, respectively, in the order of traveling direction of the input light. The radius of curvature of the first axial direction of the curved surface disposed first is 5.73mm, and the radius of curvature of the first axial direction of the curved surface disposed later may be -45.86mm.

Here, the condensing region may be implemented as one curved surface having a curvature in the second axial direction, and the radius of curvature in the second axial direction of the curved surface implementing the condensing region may be designed to be 13.38 mm.

Here, the first reflecting surface and the second reflecting surface may be arranged in parallel with each other.

Here, the first reflecting surface and the second reflecting surface may be designed to have a trapezoidal shape that is wider in the order of the traveling direction of the input light.

Here, the optical path lengths each time the input light is zigzag reflected between the first reflecting surface and the second reflecting surface of the light guide plate may be designed to be 5 mm.

The light guide plate of the present invention may further include a collimation region for collimating the input light in parallel.

The light guide plate may include a first reflecting surface and a second reflecting surface positioned to face the input light in a zigzag manner, and the collimation region may be disposed on the first reflecting surface or the second reflecting surface. Can be formed.

Here, the collimation region may be implemented as two curved surfaces spaced apart from one of the first reflective surface and the second reflective surface, and the curved surface disposed first in the direction of travel of the input light. The radius of curvature of is -1.74mm, the radius of curvature of the surface to be placed can be designed to 21.68mm.

Here, the collimation region may be disposed in advance of the magnification region in the order of the direction of the input light in the light guide plate.

Here, the inside of the light guide plate may be filled with air or glass.

Here, the enlarged region may include one or more curved surfaces having a cylindrical shape. In this case, the central axis of curvature of the curved surface having the cylindrical shape may be parallel to the second axis direction.

Here, the light collecting region may include one or more curved surfaces having a cylindrical shape. In this case, the central axis of curvature of the curved surface having the cylindrical shape may be parallel to the first axis direction.

According to another aspect of the present invention, an optical modulator for generating modulated light by receiving the above-described light guide plate, a light source for generating input light input to the light guide plate, and linear light output through the light guide plate. A display device including a may be provided.

The apparatus may further include a projection lens configured to enlarge and project the modulated light generated by the optical modulator on the screen.

According to the light guide plate and the display device using the same according to the present invention, in converting (condensing) the two-dimensional beam emitted from the light source into the one-dimensional beam, the condensing efficiency of the converted one-dimensional beam is more maximized, There is an effect to improve the sex.

In addition, the present invention has the effect of miniaturizing the optical system by reducing the size, volume of the display device by achieving the collimation, expansion and condensation of the light emitted from the light source by a single light guide plate.

In addition, the present invention has an effect that can be applied to a small digital device such as a mobile phone, a PMP, as well as a large display device by simplifying the configuration of the display device and reducing the volume of the manufactured optical device.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. The term and / or includes a combination of a plurality of related items or any item of a plurality of related items.

When referred to herein as being "investigated" or "input" from one component to another component, it may be directly investigated or inputted directly to the other component, but in the intervening through other components It will be understood that it may be entered. On the other hand, when a component is referred to as "directly inspected" or "directly input" to another component, it should be understood that it does not go through other components in the middle.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view schematically showing a light guide plate and a display device using the same according to a first embodiment of the present invention, Figure 2 is a schematic view showing a light guide plate and a display device using the same according to a second embodiment of the present invention The figure shown. 3A is a view illustrating a form of light that changes as light input from a light source sequentially moves past the light guide plate of the present invention, and FIG. 3B schematically illustrates the light guide plate of the present invention and a display device using the same. The figure shown.

1 and 2 illustrate a side view of the light guide plate and the display device using the same according to one side of the present invention. Here, in the drawings attached to the present specification, only the optical axis of the input light is shown as a reference (indicated by a dotted line) for convenience of illustration and description. In addition, the illustration of the curved surface for each collimation area, magnification area and condensation area of the light guide plate 100 in the side view of FIGS. 1, 2, 4A to 4E and 6 shown throughout the present specification is actually It is not intended to show the shape of the surface, but merely for convenience of explanation of whether the angle of divergence of the light is reduced (ie, has a positive refractive power) or the angle of divergence (ie, has a negative refractive power) by the surface. It should be clearly understood that it is only a label regardless of form or shape. Therefore, whether each curved surface has a spherical shape, a cylindrical shape having a curvature in the X-axis direction, or a cylindrical shape having a curvature in the Y-axis direction, etc. should be based on the perspective view shown in FIG. 3B. Let's clarify first.

1 and 2, the light guide plate 100 according to the present invention includes a first reflecting surface 100-1 and a second reflecting surface 100-2 facing each other. The light guide plate 100 receives light generated and emitted by the light source 10 (see the form of light shown in identification code (a) of FIG. 3A), and the input light is reflected on both sides through these two reflection surfaces. The optical path has a zigzag shape and proceeds in a predetermined direction (ie, the longitudinal direction of the arranged light guide plate 100). In addition, the light guide plate 100 may be provided with a collimation region 110, an enlarged region 120, and a light condensing region 130, and these regions may be the first reflecting surface 100-1 or the second reflecting surface, respectively. 100-1 may be disposed in various ways (see various embodiments of FIGS. 4A to 4E and 6 in addition to FIGS. 1 and 2). Here, the light guide plate 100, the light source 10, and the light modulator 140 constitute a display device of the present invention. Hereinafter, each structural part of the light guide plate of this invention is demonstrated in detail. However, for each component of the display apparatus using the light guide plate 100 (except for the light guide plate 100 to be described below), the light source 10, the light modulator 140, or the projection lens (not shown) may be projected. In the display device of the general and known components corresponding to the bar, its detailed description will be omitted.

The first reflecting surface 100-1 and the second reflecting surface 100-2 are disposed at positions facing each other on the light guide plate 100 to reflect the input light input from the light source 10 in a zigzag. In this case, the first reflective surface 100-1 and the second reflective surface 100-2 may be arranged in parallel as illustrated in FIGS. 1 and 2. In this way, the input light input to the light guide plate 100 is reflected on both sides through the first reflecting surface 100-1 and the second reflecting surface 100-2 so as to have a zigzag optical path. 1 and 2, the optical axis of the light emitted from the light guide has an inclination by a predetermined angle with respect to the vertical axis of the first reflective surface 100-1 or the second reflective surface 100-2. It is set to be input to the board 100. However, it is not necessary to set it as such, and as shown in FIGS. 4C and 4D, when the light guide plate 100 receives the light emitted from the light source 10 and forms a predetermined portion that initially reflects, the inclined surface is formed. It will be readily appreciated that the optical axis of the light source 10 may be set equal to the vertical axis of the first reflective surface 100-1 or the second reflective surface 100-2.

In this case, the interior of the light guide plate 100 (that is, the internal space between the first reflective surface 100-1 and the second reflective surface 100-2) may be filled with air or glass. Can be. The first reflecting surface 100-1 and the second reflecting surface 100-2 of the light guide plate 100 are trapezoids whose widths are widened in the order in which the input light travels, as shown in FIGS. 3A and 3B. It may have a form.

The collimation region 110 serves to adjust the divergence angle of the input light so that the input light input to the light guide plate 100 can be collimated in parallel. For this purpose, the collimation region 110 may include one or more curved surfaces formed of a spherical surface or an aspherical surface having a predetermined curvature having positive refractive power. Here, having a positive refractive power means that the divergence angle of the input light is reduced while passing through the collimation region 110. The collimation region 110 may be formed of two or more curved surfaces (see identification numbers 112 and 114 of FIGS. 1 and 2) according to design conditions for parallel collimation of input light as shown in FIGS. 1 and 2. Of course. In addition, the parallel collimation before the input light is enlarged through the enlarged area 120 which will be described later is advantageous to enlarge while maintaining the uniformity of light, so that the collimation area 110 is a direction in which the light is input in the light guide plate 100. It may be preferable to be disposed before the magnification region 120 in order.

The magnification area 120 receives input light collimated in parallel through the collimation area 110 and generates a magnification light in which the length of the input light in the first axis direction is enlarged (identification code (b) of FIG. 3A). To the form of light shown in) from before the form of light shown in identification (c)). Here, the first axis direction of the input light will be described below as being assumed to be the X-axis direction as shown in FIGS. 3A and 3B, but it may be reversed (ie, the Y-axis direction). For example, the enlarged region 120 has a cylinder having a curvature having negative refractive power only on a surface corresponding to the same direction as the X-axis direction of the input light (that is, setting the center axis of the curvature to be parallel to the Y-axis direction). By forming a cylindrical shape, the length of the input light in the X-axis direction can be enlarged (see FIG. 3B). In this case, the enlarged area 120 may be formed of two or more curved surfaces (see identification numbers 122 and 124 of FIGS. 1 and 2) as shown in FIGS. 1 and 2 to adjust the enlargement ratio according to the intended design condition. Can be. As such, when two or more curved surfaces are provided, the degree of curvature formation can be appropriately adjusted in enlarging the input light according to the designer's intended condition, thereby reducing the manufacturing cost and simplifying the design. In order to design the enlarged region 120 using only one curved surface, a curved surface having a larger curvature or a larger magnification ratio must be formed, which requires a complicated and precise molding process, and accordingly, a manufacturing cost may increase. Because it can.

The light converging region 130 receives the magnified light having an enlarged length in the first axis direction (in the present embodiment, the X axis direction) through the magnified area 120, and is orthogonal to the second axis direction (the first axis direction) of the magnified light. In this embodiment, the length of the Y-axis direction) serves to condense to one focal point outside the light guide plate 100. To this end, the light converging region 130 has a curvature having a positive refractive power only on a surface corresponding to the same direction as the Y-axis direction of the enlarged light (that is, setting the center axis of the curvature to be parallel to the X-axis direction) ( cylinderical shape) (see FIG. 3B). That is, the light converging region 130 receives the two-dimensional enlarged light and condenses the length in one axial direction to one focal point outside the light guide plate 100 to convert the two-dimensional enlarged light into one-dimensional linear light. .

In this case, the linear light converted and output through the condensing region 130 may be incident to the optical modulator 140. That is, the input light is finally converted to linear light in one dimension while passing through the light guide plate 100 of the present invention, and the line is incident to the light modulator 140 (that is, one-dimensional incidence). Here, the one-dimensional incidence column defined in the present specification is a width in one axial direction of the linear light incident on the optical modulator 140 (in this embodiment, a width in the Y-axis direction (identified by identification code (c) of FIG. 3A). Light type)) has a value equal to or slightly larger than the size of one pixel of the optical modulator 140. For example, assuming that the size of one pixel of the optical modulator 140 is about 20 μm in the X and Y directions, respectively, the width of the linear light incident on the optical modulator 140 in the Y axis direction is 20 μm. This may be the case or greater than this.

Here, the optical modulator 140 is an optical element that receives diffracted light (ie, modulated light) by receiving light (color light) irradiated from a light source or the like and modulating the light (color light) according to predetermined light intensity information. It can be applied to the present invention without any limitation, and the like. In this case, the light intensity information means image information for each color light of the color image to be actually implemented on the image. However, the optical modulator 140 corresponds to a known optical element that can be easily understood by those skilled in the art even if there is no special description. In this specification, a detailed description of the structure or the light modulation principle will be omitted.

The light guide plate 100 of the present invention and each component constituting the display device using the same have been described above. Although not described in detail through the foregoing description, the light guide plate 100 of the present invention includes linear light converted through the light input unit and the light guide plate 100 for receiving the light emitted from the light source 10. Obviously, it may include an optical output unit for outputting to the outside. For example, the light input unit and the light output unit may be implemented as a predetermined input surface or output surface for receiving light into the light guide plate 100 or outputting the light to the outside of the light guide plate 100. The face or output face may consist of a refracting face or may be formed as a kind of void, such as a gap.

In addition, the collimation region 110, the magnification region 120, and the light converging region 130 described above may be predetermined on the first reflective surface 100-1 or the second reflective surface 100-2 of the light guide plate 100. Of course, it can be formed through the molding process or polishing process. For example, a portion of the first reflective surface 100-1 or the second reflective surface 100-2 in a planar state may be cut or polished to form a curved surface having a predetermined curvature and a predetermined shape. Of course. In addition, the lens of the curved shape having a predetermined curvature and the predetermined shape may be formed by attaching to a partial region of the first reflective surface 100-1 or the second reflective surface 100-2 beforehand. Of course.

In addition, each of the curved surfaces forming the collimation region 110, the enlarged region 120, and the light converging region 130 may be the first reflective surface 100-1 or the second reflective surface 100 of the light guide plate 100. It may be formed in one or a plurality of -2), it will be apparent that various modifications are possible depending on the parallel collimation, magnification, the ratio, efficiency, etc. of the light, respectively, as desired. In addition, the curved surface may be embossed (i.e., the light guide plate 100) regardless of the shape as long as the curved surface can achieve each function (i.e., parallel collimation, magnification, and condensation) of the curved surface. Protruded based on the reflective surface) or intaglio (that is, depressed based on the reflective surface of the light guide plate 100).

As described above, the present invention has the advantage of miniaturizing the optical system or the display device by reducing the size and volume of the display device by achieving collimation, expansion and condensation of the light emitted from the light source by a single light guide plate. .

4A to 4E further illustrate various embodiments of the light guide plate and the display device using the same according to the present invention. As described above, the light guide plate and the display device of the present invention may be modified in addition to the structure and shape described above with reference to FIGS. 1 and 2. That is, the light guide plate 100 of the present invention may be manufactured to have an optimal structure and shape according to the design conditions determined by the designer, for example, by the method described with reference to FIG. 5.

Referring to FIG. 5, light emitted from the light source 10 according to a predetermined numerical aperture (NA) is input into the light guide plate 100. At this time, the angle formed between the optical axis of the light emitted from the light source 10 disposed outside and input to the light guide plate 100 and the vertical axis of the first reflective surface 100-1 or the second reflective surface 100-2 is determined. α is an angle formed by the optical axis of the reflected light when the input light is reflected zigzag in the light guide plate 100 and the vertical axis of the first reflective surface 100-1 or the second reflective surface 100-2. If α ', Equation 1 below holds true according to Snell's law.

Here, n _a indicates the refractive index of the material constituting the outside of the light guide plate 100 (eg, the refractive index 1 of air), and n _d means the refractive index of the material constituting the inside of the light guide plate 100.

Equation 1 may be equally applied when the input light is reflected inside the light guide plate 100 in a zigzag form and output to the outside of the light guide plate 100. In this case, the diameter D of the output light output to the outside of the light guide plate 100, the width t of the light guide plate 100, and the reflection angle α ′ of the input light inside the light guide plate 100 are described below. Equation 2 is established.

Therefore, after measuring the diameter of the output light output to the outside of the light guide plate 100, using the equation (2) can determine the thickness of the light guide plate 100. Here, the internal reflection angle α 'of the light guide plate 100 is represented by Equation 1 when the incidence angle α input to the light guide plate 100 and the refractive index n _d of the light guide plate 100 are known according to a predetermined numerical aperture. Can be obtained according to Snell's law. That is, by using the above Equation 1 and Equation 2, the designer can design the light guide plate 100 according to the intended design conditions in a variety of structures, forms.

FIG. 6 is a view schematically showing an optical guide plate and a display device using the same according to an eighth embodiment of the present invention, and FIG. 7 is actual implementation data for implementing the light guide plate and the display device using the same. Figure 1 shows an example.

Here, each parameter in the table shown in FIG. 7 will be described. 'Radius' of the table is data representing the radius of curvature for each part in the light guide plate 100 of the present invention, and 'Thickness' represents the distance to each part in the light guide plate 100 of the present invention. Data is 'Glass' is data indicating the glass properties for each part in the light guide plate 100 of the present invention, 'Diameter' is the light guide of the present invention input light input to the light guide plate 100 It is data which shows the diameter of the Y-axis direction of the light which changes according to each part of the board | plate 100. In addition, in the table of FIG. 7, 'OBJ' means the light source 10, and 'IMA' means the light modulator 140 that is an object to perform light modulation according to predetermined light intensity information.

An example of implementation data for each part of the light guide plate 100 and the display device using the same according to the present invention will be described with reference to FIGS. 6 and 7 as follows. First, in the case of the radius of curvature of each part in the light guide plate 100 of the present invention, the radius of curvature r1 of the first curved surface 112 of the collimation region 110 is -1.740804 mm, and the The radius of curvature r2 of the second curved surface 114 is 21.68206 mm, and the radius of curvature r3 (ie, the radius of curvature in the first axial direction) of the first curved surface 122 of the enlarged region 120 is 5.732748 mm. , The radius of curvature r4 of the second curved surface 124 of the enlarged region 120 (also, the radius of curvature in the first axial direction) is −45.86038 mm, and the radius of curvature r5 of the condensing region 130 (that is, Radius of curvature in the second axis direction is 13.38421 mm.

In this case, the radius of curvature of the remaining portion means 'infinity', which means that the portion is flat without curvature, and in the case of the first curved surface 122 and the second curved surface 124 of the enlarged region 120. It can be seen that the curved surface in the X-axis direction is taken to extend the length of the first light direction of the input light in the first axis direction (that is, the X-axis direction in the present embodiment). It can be seen that a curved surface in the Y-axis direction is taken to collect the length of the second axis direction (that is, the Y-axis direction in the present embodiment) and convert the light into linear light (see 'Shape' in the table of FIG. 6). 'Reference). In this case, the radius of curvature is represented by a positive or negative value only by which the center of curvature of the circle is drawn according to the curvature. In the case of this table, the center of curvature is positioned as (-) when the center of curvature is located on the left side, and when the center of curvature is located on the right side as (+).

 Next, in the case of the distance to each part in the light guide plate 100 and the display device using the same according to the present invention, the light input surface of the light source 10 and the light guide plate 100 (light guide plate 100 of FIG. Distance d1) is 7 mm, and then the distance d2 between the light input surface and the first reflecting surface 100-1 is reflected by zigzag in the order of the direction of the input light. 5 mm, the distance d3 between the first reflective surface 100-1 and the first curved surface 112 of the collimation region 110 is −5 mm, and the first curved surface 112 and the first curved surface 112 of the collimating region 110 are located. The distance d4 between the reflecting surface 110-1 is 5 mm, the distance d 5 between the first reflecting surface 110-1 and the second curved surface 114 of the collimation region 110 is −5 mm, and the collimation region is The distance d6 between the second curved surface 114 of the 110 and the first curved surface 122 of the enlarged area 120 is 5 mm, and the first curved surface 122 and the second reflective surface of the enlarged area 120 ( The distance d7 between 100-2 is -5mm, and the second reflection surface 100-2 and the first reflection The distance d8 between 100-1 is 5 mm, the distance d9 between the first reflective surface 100-1 and the second curved surface 124 of the magnified area 120 is -5 mm, and the magnified area 120 Distance d10 between the second curved surface 124 and the first reflective surface 100-1 is 5 mm, and the distance d11 between the first reflective surface 100-1 and the light converging region 130 is -5 mm. The distance d12 between the light converging region 130 and the light output surface of the light guide plate 100 (see the inclined surface from which light is output to the outside in the light guide plate 100 of FIG. 6) is 5 mm, and the light output surface And the distance d13 between the optical modulator 140 is 1 mm.

The light guide plate 100 and the display device using the same of the present invention are enlarged to 10 mm when the diameter of the X-axis direction of the input light is finally output from the light output surface from 0.06 mm according to the above-described curvature radius and distance. It can be confirmed. Of course, the diameter in the Y-axis direction of the output light output to the outside through the light output surface is condensed by the condensing region 130 and converted into linear light in one dimension. This will be more clearly understood through FIGS. 8 and 9 to be described later.

8 is a view for explaining the uniformity of the light emitted by the light guide plate of the present invention and the display device using the same, Figure 9 illustrates the light collection efficiency of the light emitted by the light guide plate of the present invention and the display device using the same It is a figure for following.

That is, FIG. 8 illustrates the uniformity of illuminance in the X-axis direction when the input light input to the light guide plate 100 of the present invention is finally converted into linear light in one dimension and is incident on the line to the optical modulator 140. FIG. 9 is a diagram illustrating the light collection efficiency in the Y-axis direction when the light is converted into linear light and incident on a line into the optical modulator 140.

First, referring to FIG. 8, it can be seen that the relative illuminance value of the linear light output by the display apparatus using the light guide plate 100 of the present invention becomes 0.5 or more from the center to about -4 mm and + 4 mm. . That is, the relative illuminance from the center of the X-axis direction of the linear light incident to the light modulator 140 through the display device of the present invention to a range of about ± 4 mm is maintained at a value of about 0.5. In general, when the linear light incident on the optical modulator 140 has a relative illuminance of 0.5 or more, the illuminance uniformity may be considerably excellent. This means that the brightness of the linear light incident on the optical modulator 140 through the display device of the present invention when the length in the X axis direction of the optical modulator 140 according to the present invention is about ± 4 mm from its center. Intensity) can be kept uniform. As such, when the brightness (intensity) of the linear light incident on the optical modulator 140 is maintained uniformly, since the accurate light modulation is performed through the optical modulator 140, for example, the color display apparatus using the display apparatus of the present invention. There is an advantage that can increase the accuracy of color image implementation in.

Next, referring to FIG. 9, it can be seen that the relative illuminance of the linear light incident on the optical modulator 140 through the display device of the present invention is concentrated in the center of the Y-axis direction of the optical modulator 140. Here, the y-axis of the graph of FIG. 9 means a relative illuminance of linear light, and the x-axis of the graph means a distance from a center in the Y-axis direction of the optical modulator 140. After all, this shows that the linear light converted through the display device of the present invention and line incident to the optical modulator 140 has excellent linear characteristics. That is, it can be seen that the display device of the present invention has a very good light collection efficiency.

As described above, the light guide plate and the display device according to the present invention convert the two-dimensional light emitted from the light source 10 into one-dimensional linear light, despite minimizing its size and volume by unifying its configuration. In this case, the light collecting efficiency is very excellent, and the uniformity of illuminance of the converted linear light can be maintained.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art to which the present invention pertains without departing from the spirit and scope of the present invention as set forth in the claims below It will be readily understood that modifications and variations are possible.

1 is a view schematically showing a light guide plate and a display apparatus using the same according to a first embodiment of the present invention.

2 is a schematic view of a light guide plate and a display device using the same according to a second embodiment of the present invention.

3A illustrates the form of light that changes as light input from a light source sequentially moves past the light guide plate of the present invention.

Figure 3b schematically shows a perspective view of the light guide plate of the present invention and a display device using the same.

4A is a schematic view of a light guide plate and a display device using the same according to a third embodiment of the present invention.

Figure 4b is a schematic view showing a light guide plate and a display device using the same according to a fourth embodiment of the present invention.

4C is a schematic view of a light guide plate and a display device using the same according to a fifth embodiment of the present invention.

4D is a schematic view of a light guide plate and a display device using the same according to a sixth embodiment of the present invention.

4E is a schematic view of a light guide plate and a display device using the same according to a seventh embodiment of the present invention.

5 is a view for explaining the light reflection characteristics of the light guide plate of the present invention.

6 is a schematic view of a light guide plate and a display device using the same according to an eighth embodiment of the present invention.

FIG. 7 is a diagram illustrating an example of actual implementation data for implementing the light guide plate and the display device using the light guide plate shown in FIG. 6.

8 is a view for explaining the uniformity of the light emitted by the light guide plate of the present invention and a display device using the same.

9 is a view for explaining the light collecting efficiency of light emitted by the light guide plate and the display device using the same according to the present invention.

<Description of the symbols for the main parts of the drawings>

100: light guide plate 100-1: first reflective surface

100-2: second reflecting surface 110: collimation area

120: enlarged area 130: condensed area

140: light modulator

Claims (18)

A light guide plate comprising a first reflecting surface and a second reflecting surface which are positioned to face the input light in a zigzag so as to be reflected, An enlarged region positioned on at least one reflective surface of the two reflective surfaces to enlarge the length in the first axial direction of the input light to generate enlarged light; Located in at least one reflective surface of the two reflection surface, the length of the second axis direction orthogonal to the first axis direction of the magnified light is focused to one focal point outside the light guide plate to convert the output into linear light Condensing area; And A collimation region positioned on at least one reflecting surface of the two reflecting surfaces and disposed in advance of the magnification region in the order of travel direction of the input light to collimate the input light in parallel. Light guide plate comprising a. delete The method of claim 1, The enlarged area may be implemented as two curved surfaces having curvature in the first axial direction, which are separately disposed on the first reflective surface and the second reflective surface, respectively. The radius of curvature in the first axial direction of the curved surfaces disposed first in the order of the traveling direction of the input light among the two curved surfaces is 5.73 mm, and the radius of curvature in the first axial direction of the subsequent curved surfaces is -45.86 mm. Light guide plate made. The method of claim 3, The condensing region may be implemented as one curved surface having a curvature in the second axial direction. And a radius of curvature in the second axial direction of the curved surface implementing the condensing region is 13.38 mm. The method of claim 1, And the first reflecting surface and the second reflecting surface are parallel to each other. The method of claim 1, The first reflecting surface and the second reflecting surface has a light guide plate, characterized in that the trapezoidal shape is widened in the order of the traveling direction of the input light. The method of claim 1, And a light path length each time the input light is zig-zag reflected between the first reflecting surface and the second reflecting surface of the light guide plate. delete delete The method of claim 1, The collimation region may be implemented as two curved surfaces spaced apart from one of the first reflective surface and the second reflective surface. The radius of curvature of the curved surfaces first disposed among the two curved surfaces in the order of travel direction of the input light is -1.74 mm, and the radius of curvature of the curved surfaces that are later disposed is 21.68 mm. delete The method of claim 1, The light guide plate is characterized in that the interior of the light guide plate is filled with air or glass. The method of claim 1, And said enlarged area comprises at least one curved surface having a cylindrical shape. The method of claim 13, And a center of curvature of the curved surface having the cylindrical shape is parallel to the second axis direction. The method of claim 1, And the condensing region comprises at least one curved surface having a cylindrical shape. The method of claim 15, And a central axis of curvature of the curved surface having the cylindrical shape is parallel to the first axis direction. The light guide plate of any one of Claims 1, 3-7, 10 and 12-16, The light source which produces | generates the input light input into the said light guide plate, And a light modulator for receiving modulated light by receiving the linear light output through the light guide plate. The method of claim 17, And a projection lens that enlarges and projects the modulated light generated by the optical modulator on a screen.

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