TW583458B - Liquid crystal display apparatus - Google Patents

Abstract

Disclosed is a liquid crystal display apparatus having enhanced axial brightness as well as embodying a thin and lightweight LCD. A first light generated from a light source is incident to a light guiding plate. A path of the first light is changed by the light guiding plate, and a third light exits toward a reflecting plate. Then, the third light is reflected on the reflecting plate to be changed into a second light with enhanced axial brightness. The third light is converged to be the second light with enhanced axial brightness by the reflecting late with a surface structure having a triangular prism shape. Thus, the liquid crystal display apparatus is capable of enhancing the axial brightness as well as minimizing the overall dimension and weight.

Description

583458 A7 V. Description of the invention (1) Background of the invention 1. Field of the invention The present invention relates to a liquid crystal display device, and more specifically, to a method for enhancing axial brightness and including a thin and light weight Liquid crystal display (LCD) device for light liquid crystal display (LCD). 2. Description of the know-how. In recent years, data processing devices have been rapidly developed with different forms, functions, and faster data processing speeds. The data processing device requires a display device that displays the processed data. A cathode ray tube (CRT) type display device is typically used as a display device, but recently developed liquid crystal display devices are lighter and smaller than a cathode ray tube (CRT) type display device, making it more suitable as a computer display. Appliances, home wall-mounted televisions, and display devices for other data processing devices. Generally, a liquid crystal display device uses a specific molecular configuration to apply a voltage to the liquid crystal, so as to convert the specific molecular configuration into another molecular configuration. Therefore, the liquid crystal display device converts, for example, changes in optical properties of birefringence, optical rotation magnification, dichroism, and optical scattering characteristics of liquid aa tanks that emit light according to molecular arrangement into visual changes, and uses liquid crystals for displaying data The light of the slot is modulated. Because the liquid crystal display device is a kind of passive light which cannot emit light by itself, the liquid crystal display device displays an image by a backlight assembly attached to the back of the liquid crystal display panel. Nowadays, in order to have the most competitive position, a number of them have been developed. 4 Please read the notes on the back before filling in this page. The paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X297 public love). )

A thin and light LCD structure is achieved. In particular, when considering that the lcd system is mainly used in a portable computer or the like, a light-weight lcd system is regarded as an important factor. In this liquid crystal display device, the size and light efficiency of the liquid crystal display device are specifically changed according to the structure of the light source assembly, and the structure of the backlight assembly affects the entire mechanical / optical characteristics of the liquid crystal display device. Therefore, the role and function of the backlight assembly has gradually become an important issue. FIG. 1 is an exploded perspective view showing a conventional liquid crystal display device, and FIG. 2 is a cross-sectional view of the liquid crystal display device shown in FIG. Referring to Figures 1 and 2, a liquid crystal display device 50 includes a moon light source assembly 30 for generating light, and a liquid crystal display panel 40 for receiving light to display an image. The moon light source assembly 30 includes a light source portion 10 configured to generate a first light, a light cover 14 covering one side of the light 12, and a light guide plate 20 for directing the first light to the liquid crystal. Display board 40. A cold-cathode tube is mainly used as the lamp 12, and the first light generated by the lamp 12 is incident on the lateral surface of the light guide plate 2G. The light reflecting member is formed on the inner surface of the light cover, and the first light is reflected by the light cover 14 toward the light guide plate M side, thereby enhancing the use efficiency of the first light. The light guide plate 20 allows the first light from the lamp 12 to advance toward the liquid crystal display panel 40 mounted on the upper portion of the light guide plate 20. To perform this operation, a different pattern (not shown) 'such as a fine dot pattern is printed on the bottom surface of the light guide plate. The different patterns change the direction of the first light direction. V. Description of the invention (3) Crystal display panel 40. Meanwhile, a reflecting plate 22 is installed below the light guide plate 20. A diffusion sheet 32, a first stack sheet 34, a second stack sheet 36, and a protective sheet 38 are sequentially stacked on the light guide plate 20. The reflecting plate 22 reflects the second light leaked out of the printed pattern of the light guide plate 20 toward the light guide plate 20, so the reflecting plate 22 can prevent the loss of the third light incident on the liquid crystal display panel 40. The diffusion sheet 32 disperses the third light incident from the light guide plate 20, thereby preventing a partial gathering of a fourth light radiated from the diffusion sheet 32. A plurality of triangular ridges are formed on the upper surfaces of the first and second ridges 34 and 36, respectively. The first and second diaphragms 34 and 36 enhance the axial shell degree by the angled range of the fourth light rays diffused by the narrow channel of the diffusion sheet 32. In other words, the first and second sheets 34 and 36 cover the fourth light incident from the diffusion sheet 32 to the first and second directions 01 and 02, which are perpendicular to each other on a plane and are perpendicular to the liquid crystal display panel. The display plane of 40 is parallel, thereby emitting a fifth light having an enhanced axial brightness. The protection sheet 38 protects the surface of the second sheet 36 and prevents the moiré and rainbow effects caused by the first and second sheets 34 and 36. The fifth light 'generated by the lamp 12 and passing through the plurality of optical sheets is displayed as an image by the liquid crystal display panel 40. The conventional liquid crystal display device 50 described above includes a plurality of sheets 32, 34, 36, and 38 that diffuse and cover the light guided by the light guide plate 20, thereby enhancing the brightness in the front direction. Although this structure can enhance the display characteristics of the liquid crystal display device, a plurality of sheets 32, 34, 5 and 5 and invention description (4) 38 are required. Therefore, the assembling method of the liquid crystal display device 50 becomes complicated, and the overall size and weight of the liquid crystal display device 50 are increased. SUMMARY OF THE INVENTION One of the objectives of the present invention is to provide a liquid crystal display device which enhances the axial brightness and includes a thin and light LCD. In order to achieve the above-mentioned object of the present invention, the provided liquid crystal display device includes a light source to generate a first light; Π) a light guide plate includes an incident plane to receive a first light and a first exit surface To guide the first line through the incident plane, so as to output a third light, and—a second exit surface opposite to the first exit surface is used to output—a second light incident through the first exit surface; Hi)- The reflecting plate is positioned below the lower side of the first exit surface of the light guide plate, and has a plurality of protruding portions protruding from a reflecting plane opposite to the first exit surface to reflect the fth and provide enhanced axial brightness. The second light to the light guide plate is called a liquid display panel to receive the second light from the light guide plate to display the image. Doing this 'reflection plate has a supporting layer; ii) _ gathering layer has a plurality of dog-out portions' Each protruding portion is from the surface of the branching layer-surface protrusion, 俾 1 = :: ==, and the protruding portion is repeated The surface of the object is determined from the first end portion of the support layer to a thickness of Γ and constitutes a pre-liquid crystal display device with the aggregation layer to produce a first to achieve the above and other objectives of the invention, Included-LCD display device includes i)-Light source 583458 5. Description of the invention (5) Light, a light guide plate 101 includes an incident plane to receive the first light, a first exit surface has a plurality of guides The light pattern is used to guide and transmit the first light through the incident plane, so as to output a third light, and a second exit surface opposite to the first exit surface to output a second incident light through the first exit surface; iii) a reflecting plate is positioned below the lower side of the first exit surface of the light guide plate, and has a plurality of protruding portions protruding from a reflecting plane opposite to the first exit surface to reflect the third light and provide Intensity of the second light guide plate axially luminance; IV) a second liquid crystal display panel for receiving light from the light guide plate to display an image. At this time, the light guide pattern protruding toward the reflecting plate is a dot shape having a predetermined height to guide the first light toward the reflecting plate side. According to the present invention, the surface of the reflecting plate has the shape of a triangular prism, so that a third light ray directed toward the reflecting plate through the light guide plate is collected and a second light ray having enhanced axial brightness is reflected toward the liquid crystal display panel side. Therefore, the liquid crystal display device can enhance the axial brightness by the reflection plate and thus minimize the overall size and weight. According to the present invention, the first light generated by the light source is incident toward the light guide plate. Thus, the path of the first ray is changed, and a third ray exits from the light guide plate and is guided toward the light guide plate. Thereafter, the third light ray is collected by a reflecting plate having a triangular-shaped surface structure, and thus the reflected third light ray, that is, a second light ray, has enhanced axial brightness. The liquid crystal display panel supplies a second light with enhanced axial brightness to display an image. Therefore, the reflection plate with a 稜鏡 shape can enhance the liquid crystal display device. The paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm) A7 '----------- B7______ 5. Description of the invention (6) the axial brightness. At the same time, the reflection plate is used as a conventional type of thin sheet, which can reduce the number of sheets required in a liquid crystal display device, and thus can minimize the overall size and weight of the liquid crystal display device. The star-shaped description briefly explains the above-mentioned object and other advantages of the present invention, which will become more apparent from the detailed description of the preferred embodiments and the related drawings, wherein: FIG. 1 is a tradition Perspective view of a liquid crystal display device of the present invention; FIG. 2 is a cross-sectional view of the liquid crystal display device shown in FIG. 1; FIG. 3 is an exploded perspective view of a liquid crystal display device according to a preferred embodiment of the present invention Figure 4 is a cross-sectional view of the liquid crystal display device of Figure 3; Figures 5A to 5C are cross-sectional views showing a method of manufacturing the reflective plate shown in Figure 4; Figure 6 is a perspective Figures, showing the structure of the reflecting plate shown in Figure 5C; Figures 7 and 8 show the structure of the reflecting plate of another preferred embodiment of the present invention; Figures 9A to 9B are cross-sectional views, A manufacturing method of a reflecting plate showing another preferred embodiment of the present invention; Figures 10A to 12C are perspective views for explaining the structure of the reflecting plate; Figure 13 is a cross-section of the light guide plate of Figure 3 View; Figure 14 is marked in Figure 13 Enlarged view of Part A; 9 (Please read the precautions on the back before filling out this page) This paper size applies Chinese National Standard (CNS) A4 specifications (210X297 mm) 5. Description of the invention (Figure 15 shows the 13th floor plan) The rear plane of the light guide plate in the figure; FIG. 16 is an enlarged view, and a part of FIG. 5 is partially enlarged; and FIG. 17 is a perspective view showing a preferred specific practical example of the present invention. The optical path in the backlight assembly. The detailed description of the actual implementation will now be described in detail with reference to the accompanying drawings. Figure 3 is a diagram of a liquid crystal display device according to a preferred embodiment of the present invention. An exploded perspective view, and FIG. 4 are cross-sectional views of the liquid crystal display device of FIG. 3. Referring to FIGS. 3 and 4, a liquid crystal display device 600 includes a liquid crystal display panel 500 for displaying images, and a backlight. The source assembly 45 is used to supply uniform light to the liquid crystal display panel 500. The liquid crystal display panel 500 has a thin film transistor (TFT) substrate (not shown), and includes a switching element and pixel electrodes, and a color filter. The substrate (not shown) comprises RGB pixels and common electrodes, and a liquid crystal (not shown) is placed between a thin film transistor (TFT) substrate and a color filter substrate. Since the liquid crystal display device 600 is a passive light The element itself cannot emit light. The liquid crystal display device 600 further includes a backlight assembly 4500 attached to the back of the liquid crystal display panel 500, in order to provide light toward the liquid crystal display panel 5000. Backlight The 450 includes a light source part, which is configured with a lamp 120 for generating the first light li, and a lamp cover 14 for covering the lamp 1210 (please read the precautions on the back before filling this page). The paper size applies the Chinese National Standard (CNS) A4 specification (2KK) × 297 public love. 5. Description of the invention (8) The light guide part is used to supply the first with an enhanced axial direction by changing the 100 emitted from the light source part. The lateral surface, and a path of the second light ray L2 and the light ray L1 face the liquid crystal display panel 500. detailed. In other words, the V light part has a light guide plate 200 for guiding the first light, the line L1 ′, and a reflection plate 300.

The first light rays u generated by the lamp 120 in the radial direction are directed toward the incident plane 210 of the light guide plate 200, thereby enhancing the use efficiency of the first light rays u. The light guide plate 200 is a flat plate, and the thickness from one lateral side edge provided with the light source portion 100 to the other lateral side edge opposite to the one lateral side edge is uniform. At this time, the shape of the light guide plate 200 is not limited to a flat plate type, but a wedge-shaped light guide plate can be applied. Therefore, the thickness of the light guide plate becomes thinner when it is farther from one of the lateral sides where the light source portion 100 is disposed. That is, the thickest position is at a lateral side with the light source portion 100, and the thinnest position is at the other lateral side opposite to the one lateral side. The light guide plate 200 is generally made of a light-weight, transparent, high-strength polymethyl methacrylate (PMMA) family, which makes it difficult to crack or deform. Therefore, the light guide plate 200 is made of a material having a refractive index of 1.49. The light guide plate 200 has an incident plane 210, a first exit surface 220, and an exit surface 230. The incident plane 210 is located at the installation light source part 100 11 This paper is in accordance with the Chinese National Standard (CNS) A4 specification (210X297 mm) 583458 A7 B7 5. The lateral surface of the description of the invention (9) and receives the first light L1. The first exit surface 220 faces the reflecting plate 300, guides the first light ray L1 toward the reflecting plate 300, and emits a third light ray L3. The exit surface 230 faces the liquid crystal display panel 500 and transmits the second light ray L2 reflected by the reflection plate 300 toward the liquid crystal display panel 500. The first exit surface 220 has a plurality of light guide patterns 221 for guiding the first light L1 toward the reflection plate 300. The light guide pattern 221 will be described later with reference to the accompanying drawings. The reflection plate 300 is disposed on a lower portion of the light guide plate 200. At this time, the plurality of protruding portions having the shape of a triangular ridge are formed on the surface of the reflection plate 300, wherein the surface is opposite to the first exit surface 220 of the light guide plate 200. Therefore, the reflective plate 300 deforms the third light ray L3 into the second light ray L2 with enhanced axial brightness by the light guide plate 200, and reflects the second light ray L2 toward the liquid crystal display panel 500. On the other hand, although not shown in the drawings, a diffusion sheet or a protective sheet may be further disposed between the light guide plate and the liquid crystal display panel. Hereinafter, referring to Figs. 5A to 9B, the structure of the reflecting plate of the present invention will be described in detail. Figures 5A to 5C are cross-sectional views showing a method of manufacturing the reflecting plate shown in Figure 4. Fig. 6 is a perspective view showing the structure of the reflecting plate shown in Fig. 5C. 5A to 5C, the reflection plate 300 is completed by forming a first reflection layer 330 on a first gathering layer 320, and has a plurality of first protruding portions 325 on the support layer 310. When configured as shown in Figure 5A with polyethylene terephthalate (hereinafter this paper size applies Chinese National Standard (CNS) A4 specifications (210X297 mm) -12-(Please read the precautions on the back before filling (This page) 订 • order _ 583458 A July description (l〇) " a treat as PET) When there is no branch layer 31 〇, as shown in the figure, the _ aggregate composed of acrylic resin The layer 32 () is coated on the support layer 31o. The first-gathering layer 32G is a --layer, in which a plurality of first protruding portions us which are in the shape of a square on the supporting layer 3 10 are formed. Each first protruding portion 325 is composed of a first inclined surface 32 丨 and a second inclined surface 322. The first inclined surface forms a first angle A1 with one surface of the supporting layer 31o, and the second inclined surface and the supporting layer. One surface of 31 ° forms a second angle A2. A first end portion of the first inclined surface 321 and a second end portion of a second inclined surface 322 constitute a first pitch 323. At this time, the first pitch 323 is a pointed shape. It is preferable that the first angle A1 and the second angle A2 are between 30 and 45 degrees. Therefore, the angle formed by the first pitch 323 by the first inclined surface 321 and the second inclined surface 322 is between 90 degrees and 120 degrees, and the sum of the first angle A1 and the second angle A2 is from the triangle. Subtracted from the sum of triangles. Meanwhile, it is preferable that the first angle A1 of the plurality of first protruding portions 325 is the same as the second angle A2 of the plurality of first protruding portions 325. The reason for setting the first angle A1 and the second | angle A2 between 30 degrees and 45 degrees will be explained in the accompanying drawings later. Referring to FIG. 5C, the first reflective layer 330 is configured to have a uniform thickness on the first gathering layer 32o. At this time, the first reflective layer 33o is composed of alumina (Al203), which is formed on the first gathering layer 320 by an evaporation technique. Since the first reflective layer 330 is formed on the first gathering layer 32o with a uniform thickness, its surface structure is the same as that of the first gathering layer 32o. In other words, the first reflective layer 330 has a first reflective plane 33. The size of the paper is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm) _ 13 _

tr · (Please read the notes on the back before filling this page)

5. Description of the invention (11) The system forms a first angle ⑽ with the support layer 310, and a second reflection plane 332 forms a second angle (A2) with the slicing layer M0. At this time, the third end portion of the first reflection plane = 331 and the fourth end portion of the second reflection plane 332 constitute a second pitch 333 having a tip shape. As shown in Fig. 6, the plurality of first-projecting portions 325 are repeatedly formed from one end portion of the reverse plate 300 to the other end portion opposite to the one end portion. At this time, each of the first protruding portions 325 is sequentially formed in parallel with each other. More specifically, the plurality of first-projecting portions 325 extend to a longitudinal direction of the lamp so as to form a parallel relationship with the lamp. Therefore, the first light rays u generated by the lamp can be reflected on the first and second reflecting planes 33 and 332 of the first protruding portion knife 325, and exited toward the light guide plate 200. Figures 7 and 8 show the construction of a reflecting plate according to another preferred embodiment of the present invention. Referring to FIG. 7, the second gathering layer 327 has a plurality of second protruding portions 326, which are composed of a first inclined surface 321 and a second inclined surface 322. The second protruding portion 326 has a first pitch 323 formed by combining the first and second inclined surfaces 321 and μ], and the first pitch 323 has a smooth shape. At this time, the second reflective layer 335 is disposed on the second gathering layer 327 to have a uniform thickness. Therefore, the second reflective layer 335 is composed of a first reflective plane 331 and a second inverse two plane 332, and the second reflective layer 335 has a second pitch 333. The second pitch 333 is formed by combining the first reflection plane 331 and the second reflection plane 332, and the second pitch 333 is a smooth shape. As detailed above, the second pitch 333 of the reflecting plate 300 is smooth. The paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm) 583458 A7 _B7_ V. Description of the invention (l2) When the second pitch 333 is in the shape of a tip, it is used to reduce the external impact applied to the reflecting plate 300. As shown in Fig. 8, the plurality of second protruding portions 327 are repeatedly formed from one end portion of the reflecting plate 300 to the other end portion opposite to the one end portion. At this time, the plurality of second protruding portions 326 are sequentially formed in parallel with each other. More specifically, the plurality of second protruding portions 326 extend in one longitudinal direction of the lamp so as to form a parallel relationship with the lamp. Therefore, the first light ray (L1) generated by the lamp can be reflected on the first and second reflection planes 331 and 332, so that it exits toward the light guide plate 200. Figures 9A to 9B are cross-sectional views showing a method of manufacturing a reflecting plate according to another preferred embodiment of the present invention. Referring to Figs. 9A and 9B, a third reflective layer 340 provided with a plurality of third protruding portions 345 is directly formed on the supporting layer 310 made of PET. More specifically, the plurality of third protruding portions 345 have a third reflection plane 341 and a surface of the support layer 310 to form a first angle Ab, and a fourth reflection plane 342 and a surface of the support layer 310 to form a second angle A2. At this time, a fifth end portion of the third reflection plane 341 and a sixth end portion of the fourth reflection plane 342 are combined with each other to form a third pitch of 343 °. Referring to FIGS. 10A to 12C, detailed description will be given. The reason why the first and second angles Al, A2 of the third protruding portion 345 are set to any angle between 30 degrees and 40 degrees. Since the light guide plate 200 is made of PMMA, the refractive index of the light guide plate 200 is about 1.49. At this time, an example will be explained, in which the third light L3 exits at 50 degrees, 60 degrees, and 70 degrees. This paper standard applies the Chinese National Standard (CNS) A4 specification (210X297 mm) -15-(Please (Read the notes on the back before filling out this page)

583458 A7

The angle exits from the light guide pattern 221 of the light guide plate 200. The reason why 50 degrees, 60 degrees, and 70 degrees are taken as the exit angles for the third light L3 to exit from the light guide pattern 221 of the light guide plate 200 will be described later with reference to accompanying drawings. 10A to 12C are perspective views for explaining the structure of the reflecting plate. Here, an incident angle system is defined as an angle formed by an incident light and a normal line of an incident plane, and an exit angle system is defined by an exit light and an extension line of a lateral surface of the self-supporting layer 3 10 Angle. At the same time, a reflection angle system is defined as an angle formed by a reflected light and the normal of the reflection plane, and a refraction angle system is defined as an angle formed by an exited light and the normal of the refraction plane that exit after refraction. Meanwhile, the negative sign used in the angle means the same direction as the support layer 310 based on the normal of the third reflection plane 341 as the reference line, and the positive sign used in the angle, + ,, means the third The normal of the reflection plane 341 is used as a reference line as the reference line, and is in the same direction as the liquid crystal display panel 500. As shown in FIGS. 10A to 10C, the third reflection layer 34o is formed by a third reflection plane 341 and a fourth reflection plane 342, and the third reflection plane and the support layer 310 form a first angle A1, The fourth reflecting plane forms a second angle 8 with the supporting layer 3 10. At this time, an example is used to explain that the third light ray L3 exits from the light guide pattern 221 at the first exit angle, the second exit angle 02, and the third exit angle 03. First, referring to FIG. 10A, the third reflection plane 341 and the support layer 310 form a first angle Ab, that is, 30 degrees. The third light ray L3 exits from the light guide pattern 221 at a first exit angle of 01, that is, 70 degrees, and enters the second reflection plane 341. At this time, the third light ray L3 is at the first incident angle α i, 16 The paper size is in accordance with China National Standard (CNS) A4 (210x297 cm) 583458 A7 -----__ B7_____ 5. Description of the invention (14) That is, incident at _40 degrees, the incident angle is determined by the first angle A1 and the first exit angle (91). Thereafter, the third light ray L3 is at the first reflection angle which is the same as the first incident angle α1. Cold 1, that is, reflected at +40 degrees, and advances as a second light ray L2 toward the liquid crystal display panel 500. Referring to FIG. 10B, the third reflecting plane 341 is inclined at a first angle A1 relative to the supporting layer 31o, That is, 30 degrees. The third light ray L3 exits from the light guide pattern 221 at a second exit angle Θ2, that is, enters the third reflection plane 341 at 60 degrees. At this time, the third light ray L3 is incident on the second Angle α2, that is, incident at -30 degrees, the incident angle is determined by the first angle 八 and the second exit angle 02. After that, the third light ray L3 is at the second angle which is the same as the second incident angle α 2 Reflection angle 0 2, that is, reflected from the third reflection plane 341 at +30 degrees, and faces the liquid The display panel 500 advances as a second light ray L2. Referring to FIG. 10C, the third reflection plane 341 is inclined at a first angle Ab, that is, 30 degrees in relation to the support layer 31o. The third light ray L3 exits at the third The angle 0 3, that is, exits from the light guide pattern at 50 degrees and is incident on the third reflection plane 341. At this time, the third light ray [3 is incident at the third incident angle, that is, incident at 20 degrees, and the incident The angle is determined by the first angle μ and the third exit angle 03. After that, the third light ray L3 is cold 3 at the second reflection angle which is the same as the third incident angle "3", that is, +20 degrees from the third The reflection plane 341 reflects and advances towards the liquid crystal display panel 500 as a second light L2 ° As shown in the figures 10A, 10B, and 10C, it is best to adjust the exit angle of the third light L3. 3rd and 4th scale of the reflective plate 300. (21 () X297 _-- γτγ ~-" (Please read the precautions on the back before filling this page)

583458 A7 _____B7_ 5. Description of the invention (l5) When the radiation planes 341 and 342 are inclined at 30 degrees from the support layer 310, the third light L3 exits from the light guide plate 200 at an angle of 60 degrees. Therefore, the second light ray L2 reflected on the reflection plate 300 can be advanced in a direction related to the front side of the light guide plate. On the other hand, as shown in FIGS. 11A, 11B, and 11C, the fourth reflection layer 350 is formed by a fifth reflection plane 351 and a sixth reflection plane 3 52. The fifth reflection plane and the support layer 3 10 A third angle B1 is formed, and the sixth reflection plane and the supporting layer 310 form a fourth angle B2. At this time, an example is used to explain that the third light ray L3 exits from the light guide pattern 221 at the first exit angle 01, the second exit angle 02, and the third exit angle 03. First, referring to FIG. 11A, the fifth reflection plane 351 is related to the supporting layer 310 being inclined at a third angle B1, that is, 45 degrees. The third light ray L3 exits from the light guide pattern 221 at a first exit angle of 0, that is, 70 degrees, and enters the fifth reflection plane 351. At this time, the third light ray L3 is incident at a fourth incident angle α 4, that is, -25 degrees, and the incident angle is determined by the third angle B1 and the first exit angle 0 1. Thereafter, the third light ray L3 is reflected at a fourth reflection angle cold 4, which is the same as the fourth incident angle α4, that is, +25 degrees, and proceeds toward the liquid crystal display panel 500 as a second light ray L2. Referring to FIG. 11B, the fifth reflecting plane 351 is related to the supporting layer 31. The third angle B1 is inclined, that is, 45 degrees. The third light ray L3 exits from the light guide pattern 221 at a second exit angle 02, that is, at 60 degrees, and enters the fifth reflection plane 351. At this time, the third light ray L3 is incident at a fifth incident angle (3: 5, that is, -15 degrees, and the incident angle is determined by the third angle m and the second receding angle.

583458 A7 B7 5. Description of the invention (l6) Determined by the angle 0 2. After that, the third light ray L3 is reflected at the fifth reflection angle cold 5 which is the same as the fifth incident angle α 5, that is, reflected from the fifth reflection plane 351 at +15 degrees, and proceeds toward the liquid crystal display panel 500 as one. Referring to FIG. 11C for the second light ray L2, the fifth reflecting plane 351 is inclined at a second angle B1, that is, 45 degrees, relative to the supporting layer 310. The third light ray L3 exits from the light guide pattern 221 at a third exit angle 03, that is, at 50 degrees, and enters the fifth reflection plane 351. At this time, the third light ray L3 is incident at a sixth incident angle "6, that is, -5 degrees, and the incident angle is determined by the third angle m and the third exit angle 03. After that, the third light ray L3 is at The sixth reflection angle cold 6 which is the same as the sixth incident angle α 6, that is, reflected from the fifth reflection plane 351 at +5 degrees and advances toward the liquid crystal display panel 500 as a second light ray L 2. , 11B and 11C, although the second light ray 2 and the reflection by the third reflection plane 341 have a lower probability of advancing toward the front direction, most of the second light L2 is related to the configuration. Advancing in the front direction of the liquid crystal display panel 500 on the reflective plate 300. Meanwhile, as shown in FIGS. 121A, 12B, and 12C, the fifth reflective layer 360 passes through a seventh reflective plane 361 and an eighth reflective plane. Consisting of 362, the seventh reflection plane is tilted at a fifth angle by the self-supporting layer 3 1 0, and the eighth reflection plane is tilted by the sixth angle c2 at the self-supporting layer 31. At this time, it is applied by an example Description where the third ray is tied to the first exit angle 01 , The second exit angle Θ2 and the third exit angle exit from the light guide pattern 221. This paper size applies the Chinese National Standard (CNS) A4 specification (21〇 > < 297 public love) 19 (Please read the precautions on the back first (Fill in this page again)

• Order —

5. Description of the Invention (Π) One hundred first, referring to FIG. 12A, the seventh reflection plane 361 is related to the tilt of the support layer 310—the fifth angle C1, that is, 60 degrees. The third light ray L3 exits from the light guide pattern 221 at a first exit angle of 01, that is, 70 degrees, and enters the seventh reflection plane 361. At this time, the third light ray L3 is incident at a seventh incident angle ^ ', that is, _1G degree, and the incident angle is determined by the fifth angle C1 and the it out angle 0 1. After that, the third light ray L3 reflects at the seventh reflecting angle stone 7 which is the same as the seventh incident angle α7, that is, +10 degrees, and proceeds toward the liquid crystal display panel 500 as a second light ray L2. Referring to FIG. 12B, the seventh reflection plane 361 is related to the support layer 3ι, and is inclined at a fifth angle C1 ', that is, 60 degrees. The third light ray L3 exits from the light guide pattern 221 at a second exit angle 02, that is, 60 degrees, and enters the seventh reflection plane 361. At this time, the third three rays L3 are incident perpendicularly on the seventh reflection plane 361. Therefore, the angle formed by the third light ray L3 and the seventh reflection plane 361, that is, 90 degrees minus the eighth incident angle α 8 becomes 90 degrees, and the eighth incident angle "8 becomes zero degrees. Therefore The third light ray L3 is reflected again at the same angle as the eighth incident angle α8. Referring to FIG. 12C, the seventh reflection plane 361 is tilted at a fifth angle ci, that is, 60 degrees in relation to the support layer 31o. The three rays L3 exit from the light guide pattern 221 at a third exit angle Θ3, that is, at 50 degrees, and enter the seventh reflection plane 361. At this time, the third rays L3 are at a ninth incident angle "9, that is, ' The incident angle is +10 degrees, and the incident angle is determined by the fifth angle C1 and the third exit angle θ3. Thereafter, the third light ray L3 is reflected from the seventh reflection plane 361 to a second light ray L2 at the ninth reflection angle point 9 which is the same as the ninth incident angle α 9, that is, at 10 °. 583458 A7 £ 7_ V. Description of the Invention (18) As shown in Figures 12A, 12B, and 12C, most of the second light L2 is not on the front side of the liquid crystal display panel 500 which is disposed on the reflective plate 300. Move forward. Descriptions are made in relation to 10A to 12C. When the angle formed by the support layer 31 and the reflection plane 300 is 30 degrees or 40 degrees, most of the second light rays L2 are in the front direction related to the liquid crystal display panel 500. Go forward. Therefore, it is preferable that the angle formed by the support layer 310 and the reflection plane 300 is in the range of 30 to 45 degrees. FIG. 13 is a cross-sectional view of the structure of the light guide plate shown in FIG. 3, and FIG. 14 is an enlarged perspective view showing a portion A indicated in the n-th figure. Referring to FIG. 13, the light guide plate 200 includes an incident plane 210, a first exit surface 220, and an exit surface 230. The incident plane 210 is arranged at the light source part Π0 and receives the first light ray L1. The first exit surface 220 is the first reflective layer 330 facing the reflective plate 300 oppositely, and directs the first light L1 to the reflective plate 300 to exit the third light L3. The exit surface 230 is disposed opposite to the first exit surface 220 and transmits the second light ray L2 reflected on the reflecting plate 300 through. The first exit surface 220 has a light guide pattern 221 protruding toward the reflecting plate 300 for guiding the first light L1 to the reflecting plate 300. The light guide pattern 221 is formed on the first outlet surface 220 in a dot-like manner. At this time, the light guide pattern 221 is formed into a main body with the light guide plate 200-body. That is, the light guide pattern 221 is formed by a technique of injection molding when the light guide plate 200 is configured. As shown in Figure 14, the light guide pattern 22] [is a hexahedron shape, and its place 21 (Please read the precautions on the back before filling out this page) This paper size applies the Chinese national standard (⑽) A4 specification (210X297 (Public love) 583458 A7 __ B7_ V. Description of the invention (19) A first surface 22 la is in contact with the first outlet surface 220, a second surface 221b is opposite to the first surface 221 a, and the four surfaces, That is, the first to fourth side surfaces 221c, 221d, 221e, and 221f are adjacent to the first surface 221a and the second surface 221b. Here, the light guide pattern 221 is formed in a regular hexahedron shape, wherein the first surface 221a, the second surface 221b, and the first to fourth side surfaces 221c, 221d, 221e, and 221f are all the same. At the same time, the light guide pattern 221 is formed in a hexahedron shape, in which the distance dl between the first surface 221 a and the second surface 221 b faces each other than the four side surfaces 221c, 22Id, 22le, and 221 f. The distance d2 between the side surfaces is long. That is, when the constructed distance dl is 1.4 times the distance d2, the probability that the second light L2 is guided to the reflecting plate 300 is increased. At this time, the distance d2 between the four side surfaces 221c, 221d, 221e, and 221f facing each other from the first surface 22la to the second surface 22lb remains constant. As described above, the axial brightness is enhanced by the reflection plate 300, and the change in the optical characteristics of the second light ray L2 incident through the first exit surface 220 of the light guide plate 200 can be integrated on the light guide plate 2000. The light guide pattern 221 is formed while preventing the distance d2 from being changed. In other words, in this way, the phenomenon that the second light ray L2 related to the liquid crystal display panel 500 advancing in the front direction is refracted by the light guide pattern 221 is minimized, so the second light ray L2 does not advance in the front direction. Here, to help understand the present invention, the optical characteristics of the light guide plate 2000 will be described. This paper size applies to China National Standard (CNS) A4 (210X297 mm) (Please read the precautions on the back before filling this page)

22 583458 A7 ........-__ B7 V. Description of the invention (20T ^ ~ As shown in Figure 13, since the light guide plate 200 is composed of a PMMA group substance, its refractive index is 149 The critical angle of the light guide plate 200 is about 42.156 degrees. The first light ray L ^ incident from the incident plane 2 of the V light plate 200 advances toward the exit surface 23 of the light guide plate 200 and enters the exit surface. At this time, when the angle formed by the first light ray L1 and the normal of the exit surface 230 (hereinafter referred to as the tenth incident angle α 10) is greater than the critical angle, the first light ray U is reflected. When the tenth incident angle When α 10 is smaller than the critical angle, the first light ray U is refracted at a predetermined angle. First, when the first light ray L1 is transmitted through the exit surface 23o, because the refractive index of the light guide plate 200 is greater than the refractive index of air, the first A light ray L1 is refracted on the exit surface 230 at a first refraction angle 71 which is greater than the tenth incident angle α 10. Meanwhile, when the first ray L1 is reflected on the exit surface 23o, the first ray L1 is Reflected on the exit surface 23 to become a fourth light ray L4. The fourth light ray L4 is directed toward the light guide The first exit surface 22 of the 200 advances. Here, the first light ray L1 is reflected at the tenth reflection angle 1010 which is the same as the tenth incident angle α 10. Furthermore, the fourth light ray L4 is directed toward the first A σ surface 22o advances and enters the second side surface 221d of the light guide pattern 221. At this time, since an angle formed by the fourth light ray L4 and the normal of the second side surface 221d (hereinafter referred to as the first The eleven incident angle α11) is smaller than the critical angle of the light guide plate 200, and the fourth light ray L4 is refracted and transmitted through the second side surface 221d. That is, since the light guide pattern 22H is formed by the light guide plate 200. The material is made of the same material, so the refractive index of case 221 is red. ____ This paper size applies to China National Standard (CNS) A4 (210X297). ''--23-

_, Τ (Please read the notes on the back before filling in this page)

583458 A7 B7 5. Description of the invention (M and the critical angle is 42.156 degrees and the critical angle of the light guide plate is the same. Here, because the incident angle of the fourth light " is smaller than the critical angle, the fourth light L4 is refracted and transmitted Passing through the second side surface 22id, and the fourth light ray exits toward a reflecting plate 330 at a second refraction angle "greater than ten-incident angle α11. Here, the second refraction angle r 2 is determined by the following equation i Definition: N * SINa 11 and SIN r 2… ⑴ where the reference mark N represents the refractive index of the light guide plate 200, Q u represents the eleventh incident angle, and y 2 represents the second refractive angle. In order for the third light to be refracted and exit the light guide plate 200 toward the reflective plate 300, the eleventh incident angle α11 should be smaller than the critical angle of the light guide plate 200. For this reason, the eleventh incident angle α u is between Degrees and 42156 degrees. Therefore, according to the above equation 丨, the range of the second refraction angle is about 0 degrees to 47.844 degrees. That is, the second exit angle 02 of the third light L3 is about 42.156 degrees and 90 degrees. Because the second light L3 is tied to Exit from the light guide plate 200 at an angle between 42.156 degrees and 90 degrees. The reflecting plate 300 has first and second reflecting planes 331 and 332, which are related to the supporting layer 310 in the range of 30 to 45 degrees. It is inclined at an angle. For example, when the third light ray L3 exits from the light guide plate 200 at an angle of 60 degrees, the first and second reflection planes 331 and 332 formed are inclined relative to the support layer 3 10 by 30 degrees. In addition, when the third light ray L3 exits the light guide plate 2000 at an angle of 90 degrees, the first and second reflection planes 331 and 332 formed are inclined 45 degrees with respect to the supporting layer 310. Therefore, 'The reflection plate 300 reflects the third light L3 and allows the second light. The paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) (Please read the precautions on the back before filling this page)

#-· 争 · 24 583458 A7 B7 V. Description of the invention (22) L2 exits from the reflective plate 300 in the front direction related to the light guide plate 200. Fig. 15 is a plan view showing the rear surface of the light guide plate of Fig. 13, and Fig. 16 is an enlarged view partially enlarging the parts B and C of Fig. 15. Referring to Figs. 15 and 16, the first exit surface 220 of the light guide plate 2000 is formed with a plurality of light guide patterns 221. The interval between the light guide patterns 221 becomes narrower as it is further away from the light source portion 100. When comparing the enlarged C area close to the light source portion 100 with the enlarged b area, the b area is opposite to the c area and has the same area as the C area. The c area is configured with the four light guide patterns 221 and the B area is configured with Nine light guide patterns 221. In other words, when it is further away from the light source part io, the number of the light guide patterns 221 per unit area is increased to increase the density of the light guide patterns 221. The reason for constituting the light guide pattern 221 will be described in detail below. Generally, since a light source portion 100 is placed next to one side surface of the light guide plate 2000, the brightness at the side surface provided with the light source portion i 00 is high, and the light source portion 100 The brightness at the opposite surface is relatively low. In other words, when it is further away from the light source section 1, the brightness becomes relatively low. In order to offset the difference in brightness, when the distance from the light source part 00 is further away, the light guide pattern 221 is structured closer. Therefore, the light set for 300 months toward the reflecting plate in the c area close to the light source part 100 is approximately equal to the reflecting plate 300 in the B area farther away from the light source part than the C area. The amount of forward light. Although it is not shown in the figure, when each light source is placed on one surface of the light guide plate and the other surface opposite to the one surface, it is far away (please read the precautions on the back before filling this page)

-Order |

5. Description of the invention (23) The interval between the light guide patterns at the -side surface and the other-side surface is more narrowed. That is, the density of the 'light-guiding pattern' is the southernmost at the middle portion of the light-guiding plate. Therefore, the brightness difference between the side surface and the other side surface provided with the light source portion and the middle portion can be offset. Fig. 17 is a perspective view showing the optical path # in the backlight formation of a preferred embodiment of the present invention. Here, in the illustrated example, the tenth incident angle α 10 is 70 degrees, and the first light L1 from the light source portion 100 is incident on the exit surface of the light guide plate 200 at the tenth incident angle 10 230 〇 Referring to FIG. 17, the first light ray Li from the light source section 1 () () advances toward the exit surface 230 side of the light guide plate 200 and enters the exit surface 23 〇. The first light ray L1 is incident on the exit surface 23 of the light guide plate 200 at a tenth incident angle α 10, that is, 70 degrees. At this time, since the tenth person's shooting angle is greater than the critical angle of the light guide plate 200, that is, 42 156 degrees, the first light ray L1 is directed toward the first exit under the tenth reflection angle stone 10 which is the same as the tenth incident angle α10. The surface 220 reflects. The fourth light ray reflected on the exit surface 230 advances toward the first exit surface 220 and is incident on the second side surface 221d of the light guide pattern 221 at the eleventh incident angle aU. The third light ray L3 is incident on the first Two side surfaces 221d. At this time, since the second side surface 221d is perpendicular to the exit surface 23 °, the eleventh incident angle all is 20 degrees. Since the eleventh incident angle system is smaller than the critical angle of the light guide plate 200, That is, 42 156 degrees, so the third light ray L3 exits toward the reflecting plate 300 at the second refraction angle T2, and the normal line related to the second side surface 221d serves as a reference line. The second refraction angle 72 is greater than five. Explanation of the invention (24) The tenth _ person's angle of incidence aU of the second light ray L2. At this time, according to the above equation 1, the second refraction angle r 2 is about 30 degrees. Therefore, the second light ray L3 is at the second At an exit angle of 02, that is, approximately 60 degrees, exit from the second side surface 221d. After that, the third light ray advances toward the reflection plate 300 and enters the third reflection plane 341 of the reflection plate 300. Here 'Because the third reflecting plane 341 is inclined and forms a first angle A with the supporting layer 31 That is, '30 degrees, the third reflection plane 341 and the extension line 221g of the second side surface 2 form an angle of -60 degrees. Therefore, when the third light ray incident on the third reflection plane 341 'is the second angle of incidence "2 becomes 30 degrees. That is, the normal composition of the third light ray L3 and the third reflection plane 341-the angle is -30 degrees. At this time, the third light ray L3 is in the second reflection with the same angle of incidence as the second Angle / 52, that is, reflected from the third reflection plane 341 at +30 degrees, and the second light ray L 2 exits and advances in the front direction of the exit surface 230 related to the light guide plate 2000. Therefore, the liquid crystal display The plate 500 displays an image by a second light L2 with enhanced axial brightness. Although the present invention has been specifically shown and related to specific embodiments, it is particularly clear, but those skilled in the art should understand It is possible to make different changes in form and details without departing from the spirit and scope of the present invention determined by the scope of the attached patent application. 583458 A7 B7 V. Description of the invention (25) 10 ... light source part 12 ... lamp 14 ... lamp Cover 20 ... light guide 22 ... reflector 3 0 ... backlight assembly 32 ... diffusion sheet 34 ... first sheet 36 ... second sheet 38 ... protective sheet 40 ... liquid crystal display panel 50 ... liquid crystal display device 100 ... light source section 120 ... lamp 140 ... lamp Cover 200 ... Light guide plate 210 ... Incident plane 220 ... First exit surface 221 ... Light guide pattern 221a ... First surface 221b ... Second surface 221c-221f ... Side component number comparison 22 lg ... extension line 230 ... exit surface 300 ... reflection plate 310 ... support layer 320 ... first gathering layer 321 ... first inclined surface 322 ... second inclined surface 323 ... first pitch 325 ... first protruding portion 326 ... second protruding portion 327 ... second gathering layer 330 ... first reflection layer 331 ... first reflection plane 332 ... second reflection plane 333 ... second pitch 335 ... second reflection layer 340 ... third reflection layer 341 ... third reflection plane 342 ... The fourth reflecting plane 343 ... the third pitch 345 ... the third protruding portion 350 ... the fourth reflecting layer (please read the precautions on the back before filling this page)

This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) 28 583458 A7 B7 V. Description of the invention (26) 351 ... the fifth reflection plane 352 ... the sixth reflection plane 360 ... the fifth reflection layer 361 ... the seventh Reflection plane 362 ... Eighth reflection plane 450 ... Backlight assembly 500 ... Liquid crystal display panel 600 ... Liquid crystal display device D1 ... First direction D2 ... Second direction L1 ... First light L2 ... Two rays L3 ... Third rays L4 ... Fourth rays A1 ... First angle A2 ... Second angle

Bl ... Third angle B2 ... Fourth angle C1 ... Fifth angle C2 ... Sixth angle 01 ... First exit angle 02 ... Second exit angle 03 ... Third exit angle α 1-α 11… First-No. Η—The incident angle is cold 1- / 310… First · Eleventh reflection angle 7 ^ ··· First refraction angle r2 ··· Second refraction angle (please read the back first (Notes to fill out this page)

· Order · 29 This paper size applies to China National Standard (CNS) A4 (210X297 mm)

Claims (1)

• A liquid crystal display device comprising: a light source for generating a first light;-a light guide plate including-a human projection plane for receiving the first light,-a-exit surface for the first -The light guide is transmitted through the incident plane, so that the output-the third light, and a second exit surface opposite to the first exit surface are used for output-the _ incident light incident through the first exit surface; The light guide plate is located under the lower side of the first exit surface of the light guide plate, and has a plurality of protruding portions protruding from a reflection plane opposite to the first exit surface to reflect the third light and provide an enhanced axial brightness. The second light to the light guide plate; and a liquid crystal display panel for receiving the second light from the light guide plate to display an image. • The liquid crystal display device according to item 1 of the patent application scope, wherein the reflecting plate comprises; a support layer;-an aggregation layer 'which has a plurality of protruding portions, each protruding portion protrudes from a surface of the supporting layer, 俾It has a shape of a ridge, and the dog-out portion is repeatedly formed on the surface of the support layer from the first end portion of the support layer to the second end portion of the support layer, and the second end portion is connected to the first end The parts are opposite to each other; and a reflective layer covering the entire surface of the aggregation layer and configured to have a predetermined thickness consistent with the aggregation layer. 3. If the liquid crystal display device according to item 2 of the patent application scope, wherein each of the breakout Fan Li, please call 0988 8 ABCD The output part includes: a first-oblique Φ, which is inclined first with the surface of the support layer Angle; and-the second inclined plane, which is inclined at a second angle with the surface of the support layer, and ^ and wherein each of the plurality of protruding portions has a distance from each other, and is composed of the first inclined plane and the second inclined plane . 4. The liquid crystal display device as claimed in claim 3, wherein the first and second angles are 30 to 45 degrees, respectively. 5. The liquid crystal display device according to item 4 of the application, wherein the first angle is the same as the second angle. 6. The liquid crystal display device as claimed in claim 3, wherein the pitch has a smooth shape. 7 · If the liquid crystal display device in the scope of application for the patent No. 丨, the reflection plate includes; (Please read the notice on the back and fill in this page first) -The reflective layer 'includes a protruding portion, each protruding portion is protruding from the surface of the support layer, so that the protruding portion has a-shape and the protruding portion is repeatedly formed on the surface of the supporting layer from the first layer of the supporting layer; -The end portion is to the second end portion of the support layer, and the second end portion is opposite to the first end portion. 8. The liquid crystal display device according to item i in the patent application range, wherein the first exit surface includes a plurality of light guide patterns protruding toward the reflecting plate in a dot-like manner with a pre-degree degree to guide the first light toward the reflection Standard paper (CNS) A4 regulations. ^^ mm 31 lines. 583458 Patent application side. 9. The liquid crystal display device according to item 8 of the patent application, wherein each of the plurality of light guide patterns is rod-shaped. 10. The liquid crystal display device according to item 9 of the patent application, wherein each of the plurality of light guide patterns has a rectangular shape when viewed from the side of the reflecting plate. 11. The liquid crystal display device according to claim 10 of the patent application, wherein the length of a portion of the light guide plate protruding from the first exit surface of each light guide pattern is longer than the width of each light guide pattern. I2. The liquid crystal display device according to item U of the application, wherein the length of each light guide pattern is 14 times the width of each light guide pattern. I3. The liquid crystal display device according to item 8 of the scope of patent application, wherein the light guide pattern has a narrower interval when configured farther from the light source. Among them, the light guide figure 14. The liquid crystal display device of item No. 8 in the patent scope is integrally formed on the light guide plate. B. A liquid crystal display device comprising: a light source for generating a first light; a light guide plate including an incident plane for receiving the first light, and a-exit surface having a plurality of The light guide pattern is used to guide and transmit the first light through the incident plane so as to output a third light and a second exit surface opposite to the first exit surface for output—the first incident through the first exit surface. Two incident light rays; a reflecting plate, which is positioned below the lower side of the first exit surface of the light guide plate, and has a plurality of protruding portions from—and the _ exit surface specification (2〗 0 X 297 public hair) The opposite reflection plane protrudes to reflect the third light and provide the second light with enhanced axial brightness to the light guide plate; and a liquid crystal display panel for receiving the second light from the light guide plate to display an image. 16 'The liquid crystal display device according to claim 1,5, wherein the light guide pattern protrudes toward the reflecting plate in a dot-like manner having a predetermined height, and is used to guide the first light toward the reflecting plate side. 17. The liquid crystal display device according to claim 16 in which each of the plurality of light guide patterns is rod-shaped. 18. The liquid crystal display device according to claim 15, wherein the reflective plate comprises: a support layer; an aggregate layer having a plurality of protruding portions, and each protruding portion protrudes from a surface of the supporting layer, so that It has a stack of shapes, and the protruding portion is repeatedly formed on the surface of the support layer from the first end portion of the support layer to the second end portion of the support, and the second end material is separated from the first end portion. Opposite; and the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs printed a reflective layer that covers the entire surface of the aggregation layer and constitutes a predetermined thickness consistent with the aggregation layer. 19. The liquid crystal display device as claimed in claim 18, wherein the plurality of protruding portions include: a first inclined surface which is inclined at a first angle with the surface of the support layer; and a second inclined surface which is connected with The surface of the support layer is inclined a second 583458 A8 B8 C8 D8. Sixth, the Intellectual Property Bureau of the Ministry of Economic Affairs, the Employee Consumer Cooperative printed the scope of the patent application, and each of the plurality of protruding parts has a pitch. The first inclined plane and the first Two bevels. (Please read Note 4 on the back of ti first: fill in this page) This paper size applies to China National Standard (CNS) A4 (210 X 297)