JP2007242410A - Lighting device, electro-optical device, and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting device having a thin light guide plate with reduced variation in luminance. <P>SOLUTION: The lighting device comprises a light source, a transparent plate, a reflecting film, and a scattering film. The transparent plate has the light source at its end face. The reflecting film on at least one side surface of the opposite plane surfaces on the transparent plate has a light reflecting capability. The scattering film on at least another side surface area of the transparent plate where no reflecting film is attached has a light scattering capability, and an uneven portion at a part corresponding to the area where no reflecting film is attached. As the transparent plate is getting away from the light source in the light outgoing direction of the light source, a coverage space occupied by the area where the scattering film is arranged with no reflecting film attached becomes larger gradually. This can reduce variation in luminance of the light guide plate consisting of the transparent plate, reflecting film, and scattering film. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an illumination device such as a backlight unit used for a liquid crystal display of a mobile phone.

  In the liquid crystal display device, a backlight unit is provided on the back side of the liquid crystal display panel in order to perform transmissive display. Generally, the backlight unit is configured as a lighting device including a light source and a light guide plate that irradiates the back surface of the liquid crystal display panel with light from the light source as planar light. The light incident on the light guide plate from the light source is repeatedly reflected between the exit surface of the light guide plate and the reflective surface facing the exit surface, and then exits from the exit surface to the outside.

  However, the brightness of the light emitted from the light guide plate is higher as the position is closer to the light source and lower as the position is farther from the light source. There was uneven brightness.

  In Patent Document 1 below, a technique is described in which light use efficiency is improved by periodically providing convex portions or concave portions on the reflection surface of the light guide plate.

JP-A-9-102209

  This invention is made | formed in view of the above point, and makes it a subject to provide the illuminating device which has a thin light guide plate with little brightness nonuniformity.

  In one aspect of the present invention, the illumination device is provided on a part of at least one surface of a light source, a transparent plate-shaped transparent plate having the light source at an end surface, and a plane facing the transparent plate. A reflective film that reflects light, and a scattering film that scatters light, provided at least in a region on the one surface of the transparent plate where the reflective film is not provided. As the distance from the light source in the light emission direction of the light source increases, the area occupied by the area where the scattering film is disposed and where the reflection film is not provided gradually increases, and the scattering film is provided with the reflection film. Concavities and convexities are provided in portions corresponding to the regions that are not formed.

  The above illumination device can be suitably used for a backlight unit of a liquid crystal display device, for example, and includes a light source, a transparent plate, a reflective film, and a scattering film. The transparent plate is a transparent plate having the light source on the end face. The light source is composed of, for example, an LED (Light Emitting Diode). The reflective film is provided on a part of at least one surface of the opposing flat surfaces of the transparent plate, and has a function of reflecting light. The scattering film is provided at least in the region where the reflective film is not provided on the one surface of the transparent plate, has a function of scattering light, and corresponds to a region where the reflective film is not provided. Unevenness is provided in the part. As the transparent plate moves away from the light source in the light emission direction of the light source, the range occupied by the region where the scattering film is disposed and the reflection film is not provided gradually increases. A light guide plate is constituted by the transparent plate, the reflective film, and the scattering film. By doing in this way, the uniformity of the brightness | luminance in a light-guide plate can be improved, and generation | occurrence | production of a brightness nonuniformity can be suppressed.

  One aspect of the illumination device is provided on both surfaces of the transparent plate facing each other. By using this lighting device for a double-sided display type liquid crystal display device, it is possible to perform display with reduced luminance unevenness in either liquid crystal display panel.

  In another aspect of the illumination device, a reflection sheet that reflects light is provided on the scattering film on the one surface side. Thereby, the uniformity of the brightness | luminance in a light-guide plate can be improved more effectively.

  In another aspect of the illumination device, the reflective film is provided on one surface of the opposing planes of the transparent plate, and an entire surface reflective film that reflects light is provided on the entire surface of the other surface. It has been. Thereby, it is not necessary to provide a reflection sheet, and the lighting device can be thinned.

  In another aspect of the illumination device, the transparent plate is a glass substrate. Thereby, a light-guide plate becomes a support body of a liquid crystal display panel, and the bending by thickness reduction of a liquid crystal display panel can be suppressed.

  In another aspect of the present invention, an electro-optical device includes a display panel and the above-described illumination device used as a backlight of the display panel. Thereby, an electro-optical device with high light utilization efficiency can be provided. In addition, an electronic apparatus including the electro-optical device as a display unit can be configured.

  In still another aspect of the present invention, the light guide plate is a reflection that reflects light provided on a part of at least one surface of a transparent plate-like transparent plate and a flat surface facing the transparent plate. A film, and a scattering film that scatters light, provided at least in a region where the reflection film is not provided on the one surface of the transparent plate, and the transparent plate emits light of the light source The farther away from the light source in the direction, the larger the range occupied by the area where the scattering film is disposed and the reflection film is not provided, and the scattering film corresponds to the area where the reflection film is not provided. Unevenness is provided in the part. By using such a light guide plate, the occurrence of uneven brightness can be suppressed.

  In still another aspect of the present invention, a method of manufacturing an electro-optical device includes a display panel manufacturing step of manufacturing a display panel in which an electro-optical material is sealed between a pair of substrates, and a glass substrate on one surface. A reflective film forming step of forming a reflective film by applying a metal film and removing a part of the metal film; and at least a scattering film in a region where the reflective film is not provided on the one surface of the glass substrate A light-scattering film forming step for forming a light guide plate, a light guide plate forming step for forming a light guide plate by cutting the glass substrate into a predetermined size, and a light source part attached to an end surface of the glass substrate to produce a lighting device An illumination device manufacturing step, and an attachment step of attaching the display panel to the illumination device. Accordingly, the lighting device can be manufactured on the same line as the line for manufacturing the liquid crystal display panel, and the manufacturing cost can be reduced.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

[Configuration of liquid crystal display device]
FIG. 1 is a cross-sectional view of a liquid crystal display device 100 to which the illumination device according to this embodiment is applied. In FIG. 1, an illumination device 10 according to the present embodiment is a surface-emitting illumination device used as a backlight unit such as a liquid crystal display device 100. The liquid crystal display device 100 mainly includes a lighting device 10 and a liquid crystal display panel 20. The illumination device 10 includes a light guide plate 16 having a light source 12 on an end surface. Further, the lighting device 10 includes a reflection sheet 17 below the light guide plate 16. The liquid crystal display device 100 includes a diffusion sheet 18 and a prism sheet 19 between the lighting device 10 and the liquid crystal display panel 20.

  In the liquid crystal display panel 20, an element substrate 91 and a color filter substrate 92 arranged to face the element substrate 91 are bonded together via a frame-shaped sealing material 5, and liquid crystal is enclosed inside the sealing material 5. Thus, the liquid crystal layer 4 is formed. The element substrate 91 has a source electrode, a gate electrode, and a pixel electrode disposed on a glass substrate, and the color filter substrate 92 has a colored layer and a common electrode disposed on the glass substrate. The liquid crystal used for the liquid crystal layer 4 is, for example, a TN (Twisted Nematic) type liquid crystal. By applying a voltage between the pixel electrode of the element substrate 91 and the common electrode of the color filter substrate 92, the alignment of the liquid crystal is controlled.

  In the illuminating device 10, the light guide plate 16 includes a plate-like transparent plate 11 formed of a transparent glass substrate, a reflective film 15 provided on the surface of the transparent plate 11 on the reflective sheet 17 side, and a reflective film 15. It is comprised from the scattering film | membrane 14 provided on the surface and which scatters light. The reflective film 15 is provided with a plurality of openings 31 that transmit light. That is, the portion corresponding to the opening 31 of the transparent plate 11 is a region where the reflective film 15 of the transparent plate 11 in the present invention is not provided.

  The light source 12 includes, for example, a plurality of LEDs (Light Emitting Diodes) 13 as point light sources, and emits light to an end surface (hereinafter referred to as “light incident end surface”) 11 c of the transparent plate 11 facing the light source 12. The upper surface 11a of the transparent plate 11 is a surface that emits light (hereinafter, referred to as “emission surface”), and the lower surface 11b is a surface that reflects light (hereinafter, referred to as “reflection surface”). .

  The light L emitted from the light source 12 enters the transparent plate 11 from the light incident end surface 11c, and is repeatedly reflected between the reflecting surface 11b and the emitting surface 11a. The light L is totally reflected in the region of the reflective surface 11b where the reflective film 15 is provided. On the other hand, when the light L is emitted from the reflection surface 11 b through the opening 31, the light L is returned to the inside of the transparent plate 11 by the scattering film 14 or the reflection sheet 17. At this time, as will be described in detail later, since the light L is scattered, its deflection direction changes. By changing the deflection direction of the light L, the angle formed by the emission surface 11a and the light L exceeds the critical angle, and the light L is emitted from the emission surface 11a toward the liquid crystal display panel 20.

  FIG. 2 is an enlarged cross-sectional view of the opening 31. In FIG. 1, it is an enlarged view of a portion surrounded by a broken line 16p. As shown in FIG. 2, the scattering film 14 is provided with unevenness in a portion 14 a corresponding to the opening 31. The uneven shape is a random uneven shape, that is, an uneven shape in which the surface of the scattering film 14 is roughened and roughened. When the light L entering the transparent plate 11 from the light incident end surface 11c is emitted from the reflecting surface 11b through the opening 31, the light L is reflected by the portion 14a depending on the angle of incidence on the unevenness of the portion 14a. The light Lr1 returned to the light and the light Lr2 refracted by the portion 14a and emitted to the outside. When the portion 14a reflects the light L, the portion 14a reflects in various directions due to the unevenness, and thus the light Lr1 becomes diffused light. On the other hand, when the portion 14a refracts the light L, it is refracted in various directions due to the unevenness, so that the light Lr2 is also diffused light. The light Lr2 emitted to the outside of the scattering film 14 is reflected by the reflection sheet 17 and returned to the inside of the transparent plate 11 from the opening 31 or another opening 31.

  Here, in order to avoid the occurrence of light reflection on the reflection surface 11b at the boundary between the transparent plate 11 and the scattering film 14, the light refractive index of the scattering film 14 is made equal to the light refractive index of the transparent plate 11. Is desirable.

  FIG. 3 shows a plan view of the illumination device 10. As described above, the reflective film 15 is provided on the surface of the transparent plate 11 on the reflective sheet 17 side. The reflective film 15 is provided with a plurality of openings 31 that transmit light. In the illuminating device 10 according to the present embodiment, as shown in FIG. 3, the reflective film 15 gradually increases in the range occupied by the opening 31 as it is separated from the light source 12 in the emission direction of the light L emitted from the light source 12. It has become. For example, in the reflective film 15 shown in FIG. 3, the openings 31 have a certain area, and the number of openings 31 gradually increases as the distance from the light source 12 increases in the emission direction of the light L emitted from the light source 12. It has a structure. By doing in this way, the light which radiates | emits from the reflective surface 11b through the opening part 31 will increase, so that it leaves | separates from the light source 12. FIG. That is, the light reflected and diffused by the unevenness in the portion 14a of the scattering film 14 increases.

  In the illumination device 10 according to the present embodiment, the reflection sheet 17 is provided on the scattering film 14. In the illumination device 10, the number of openings 31 gradually increases as the distance from the light source 12 increases in the emission direction of the light L emitted from the light source 12. The light incident from 31, that is, the light incident from the opening 31 after being reflected by the reflection sheet 17 increases.

  As can be seen from the above, in the illumination device 10 according to the present embodiment, the reflective film 15 gradually increases in the range occupied by the opening 31 as the distance from the light source 12 in the emission direction of the light L emitted from the light source 12 increases. . In other words, as the transparent plate 11 moves away from the light source 12 in the emission direction of the light L emitted from the light source 12, the range occupied by the region where the reflective film 15 on which the scattering film 14 is disposed is not provided gradually increases. . Therefore, in the illuminating device 10 according to the present embodiment, the light diffused by the scattering film 14 increases as the distance from the light source 12 increases, and the luminance at a position away from the light source 12 can be improved. Thereby, in the illuminating device 10 which concerns on this embodiment, the uniformity of the brightness | luminance in the light-guide plate 16 of the light radiate | emitted from the output surface 11a can be improved, and generation | occurrence | production of a brightness nonuniformity can be suppressed. Further, by providing the reflection sheet 17, the luminance of light can be improved more effectively at a position farther from the light source 12, and the luminance uniformity in the light guide plate 16 can be further improved.

[Method of manufacturing liquid crystal display device]
Next, a method for manufacturing the liquid crystal display device 100 according to the present embodiment will be described. FIG. 4 is a flowchart illustrating a method for manufacturing the liquid crystal display device 100 according to the present embodiment, and FIG. 5 is a flowchart illustrating a method for manufacturing the illumination device 10 in the liquid crystal display device 100 according to the present embodiment.

  First, the liquid crystal display panel 20 is produced (process R11). Specifically, in the liquid crystal display panel 20, an element substrate 91 and a color filter substrate 92 are manufactured and bonded to each other via the sealing material 5, and then liquid crystal is sealed between the element substrate 91 and the color filter substrate 92. It is produced by doing.

  Next, the illuminating device 10 is produced (process R12). The manufacturing method of the illuminating device 10 is demonstrated based on the flowchart of FIG. Here, FIGS. 6 to 7 are schematic views in the manufacturing process of the light guide plate 16.

  First, as shown in FIG. 6A, after a metal film 15o such as aluminum (Al), tantalum (Ta), molybdenum (Mo) is formed on the surface of the glass substrate 11o using a sputtering method or the like. As shown in FIG. 6B, the opening 31 is formed by removing a part of the metal film 15o using a fine processing method or the like. Thereby, the reflective film 15 is formed (process R21).

  Next, as shown in FIG. 7A, a resin having a property of scattering light, for example, a spherical particle such as a bead, and a resin having a refractive index different from that of the spherical particle is applied to the surface of the reflective film 15. After coating on the surface, irregularities are formed in a portion corresponding to the opening 31 by rubbing or the like. Thereby, the scattering film 14 is formed (step R22).

  Thereafter, as shown in FIG. 7B, the reflective film 15 and the scattering film 14 are formed on the transparent plate 11 by cutting the glass substrate 11 o along the cutting line CL in accordance with the size of the light guide plate 16. The provided light guide plate 16 is formed (step R23).

  Thus, after forming the light guide plate 16, the light source 12 is attached (process R24), and the illuminating device 10 is completed.

  Next, returning to the flowchart of FIG. 4, the liquid crystal display panel 100 is completed by attaching the liquid crystal display panel 20 to the illumination device 10 with the diffusion sheet 18 and the prism sheet 19 interposed therebetween (step R13).

  In the illuminating device 10 according to the present embodiment, as described above, a glass substrate is used as the transparent plate 11, and a metal film is formed on the glass substrate by a sputtering method or the like, and a fine processing method is performed. The light guide plate 16 is manufactured by forming the opening 31 using the above and then cutting it into the shape of the light guide plate 16. On the other hand, in the manufacturing method of the element substrate 91 of the liquid crystal display panel 20, a metal film is formed on a glass substrate using a sputtering method or the like, an electrode or the like is formed using a fine processing method or the like, and then the element substrate. The element substrate 91 is manufactured by cutting into the shape 91. That is, as can be seen from this, in the method for manufacturing the illumination device 10 according to this embodiment, the light guide plate 16 can be manufactured using a line for manufacturing the liquid crystal display panel 20. Thereby, the manufacturing cost of the light guide plate 16 can be reduced.

  Further, by using the light guide plate 16 made of a glass substrate for the liquid crystal display device 100, the light guide plate 16 serves as a support for the liquid crystal display panel 20, and bending due to the thinning of the liquid crystal display panel 20 can be suppressed.

[Modification]
Next, various modifications of the above-described embodiment will be described. FIG. 8 shows a plan view of the illumination device 10 according to the first modification. Unlike the illumination device 10 according to the above-described embodiment, the illumination device 10 according to the first modified example has the number of openings 31 provided in the direction perpendicular to the light emission direction as shown in FIG. Although the distance is the same regardless of the distance from the portion 12, the area of the opening 31 provided in the reflective film 15 gradually increases with increasing distance from the light source 12 in the emission direction of the light L emitted from the light source 12. It has become. Even in this way, the reflection film 15 gradually increases in the range occupied by the opening 31 as it is farther from the light source 12 in the emission direction of the light L emitted from the light source 12. The light diffused by the scattering film 14 increases, and the luminance at the position can be improved.

  In addition, as a shape of the reflecting film 15, it is not restricted to the shape described in the above-mentioned embodiment or the 1st modification. Instead, for example, the area of the opening 31 provided in the reflective film 15 gradually increases as the distance from the light source 12 increases in the emission direction of the light L emitted from the light source 12, and the number of the openings 31 also increases. 12 may gradually increase as the distance from the light source 12 increases in the emission direction of the light L emitted from the light 12.

  Furthermore, in FIG.3 and FIG.8, although the opening part 31 is arrange | positioned regularly, it is not restricted to this. As the distance from the light source 12 in the emission direction of the light L emitted from the light source 12 increases as the range occupied by the opening 31 in the reflective film 15 gradually increases, the openings 31 are not arranged regularly. It goes without saying that the same effects as described above can be obtained even if they are randomly arranged.

  Fig.9 (a) shows sectional drawing of the illuminating device 10 which concerns on a 2nd modification, FIG.9 (b) shows sectional drawing of the illuminating device 10 which concerns on a 3rd modification.

  As illustrated in FIG. 9A, in the illumination device 10 according to the second modification, unlike the illumination device 10 according to the above-described embodiment, a reflective film 15 is provided on the emission surface 11 a of the transparent plate 11. Yes. The reflective film 15 is provided with a plurality of openings 31 that transmit light. The range of the reflective film 15 that is occupied by the opening 31 gradually increases with distance from the light source 12 in the emission direction of the light L emitted from the light source 12. On the other hand, on the reflective surface 11b of the transparent plate 11, a full-surface reflective film 15a for reflecting light is provided on the entire surface. The entire reflection film 15 a is formed of the same material as the reflection film 15, but does not have the opening 31 unlike the reflection film 15. By doing in this way, the light radiate | emitted toward the liquid crystal display panel 20 will increase in the position far from the light source 12, and the uniformity of the brightness | luminance in the light-guide plate 16 can be improved. Further, by providing the entire reflection film 15a, it is not necessary to provide the reflection sheet 17, and the lighting device 10 can be thinned.

  As shown in FIG. 9 (b), in the illumination device 10 according to the third modification, unlike the illumination device 10 according to the above-described embodiment, on both planes facing the transparent plate 11, that is, the emission surface 11a and Reflective films 15 are provided on both surfaces of the reflective surface 11b. The reflective film 15 provided on both surfaces is provided with a plurality of openings 31 that transmit light. In the reflection film 15 provided on both surfaces, the range occupied by the opening 31 gradually increases as the distance from the light source 12 increases in the emission direction of the light L emitted from the light source 12. This also increases the light emitted toward the liquid crystal display panel 20 as the position is farther from the light source 12, thereby improving the uniformity of luminance in the light guide plate 16.

  Moreover, the illuminating device 10 which concerns on a 3rd modification can improve the uniformity of the brightness | luminance in the light-guide plate 16 also about the light radiate | emitted outside from the reflective surface 11b. Therefore, for example, in a double-sided display type liquid crystal display device in which a liquid crystal display panel is provided on both surfaces of the light guide plate 16 according to the third modification and the reflection surface 11b is also an emission surface, luminance unevenness occurs in both liquid crystal display panels. It is possible to perform a suppressed display.

  FIGS. 10A and 10B are enlarged cross-sectional views of the opening 31 of the illumination device 10 according to the modification. In the illuminating device 10 according to the above-described embodiment, the portion 14a of the scattering film 14 is provided with random unevenness, but instead of this unevenness shape, a microlens shape as shown in FIG. Alternatively, a prism shape as shown in FIG. 10B may be used.

  FIGS. 11A to 11C show various shapes of one microlens when the uneven shape of the portion 14a shown in FIG. 10A is a microlens shape. In FIGS. 11A to 11C, a plan view of one microlens is shown in the upper stage, and a cross-sectional view along the cutting line AA ′ of one microlens is shown in the lower stage. For example, in FIG. 10A, the shape of one microlens is circular as shown in FIG. 11A, that is, the shape of one microlens is a hemisphere as a whole. It is made into a shape. In this case, the light incident on the portion 14 is uniformly diffused without being directional and reflected and refracted. The shape of one microlens is not limited to the shape shown in FIG. 11 (a). Instead, the planar shape may be an elliptical shape as shown in FIG. 11 (b). As shown in FIG. 11C, the planar shape may be a diamond shape.

  In the above-described embodiment, the transparent plate 11 is formed from a glass substrate, but it goes without saying that a transparent resin such as PET (polyethylene terephthalate) can be used instead.

  Needless to say, the above-described embodiments and modifications can be combined in various ways without departing from the scope of the present invention. For example, in the light guide plate 16 in the lighting device 10 according to the third modification, the area of the opening 31 provided in the reflective film 15 on the emission surface 11a side is the emission of the light L emitted from the light source 12. In the direction, the structure gradually increases as the distance from the light source 12 increases. On the other hand, the opening 31 provided in the reflective film 15 on the reflective surface 11b side has a constant area, and the number of the openings 31 is determined by the number of the light sources. 12 may be configured to gradually increase as the distance from the light source 12 increases in the emission direction of the light L emitted from the lens 12.

  Furthermore, in the above-described embodiment and modification, the opening 31 is provided in the reflective film 15, but the present invention is not limited to this. Instead of providing a region where the reflective film 15 is not provided in the shape of an opening on the surface of the transparent plate 11, a region where the reflective film 15 is provided on the surface of the transparent plate 11 and a region where the reflective film 15 is not provided are formed in, for example, stripes. Needless to say, you can do that.

[Electronics]
Next, specific examples of electronic devices to which the liquid crystal display device 100 according to the present invention can be applied will be described with reference to FIG.

  First, an example in which the liquid crystal display device 100 according to the present invention is applied to a display unit of a portable personal computer (so-called notebook personal computer) will be described. FIG. 12A is a perspective view showing the configuration of this personal computer. As shown in the figure, a personal computer 710 includes a main body 712 having a keyboard 711 and a display 713 to which the liquid crystal display panel according to the present invention is applied.

  Next, an example in which the liquid crystal display device 100 according to the present invention is applied to a display unit of a mobile phone will be described. FIG. 12B is a perspective view showing the configuration of this mobile phone. As shown in the figure, the cellular phone 720 includes a plurality of operation buttons 721, a reception port 722, a transmission port 723, and a display unit 724 to which the liquid crystal display device 100 according to the present invention is applied.

  Note that, as an electronic device to which the liquid crystal display device 100 according to the present invention can be applied, in addition to the personal computer shown in FIG. 12B and the mobile phone shown in FIG. Type / monitor direct-view type video tape recorder, car navigation device, pager, electronic notebook, calculator, word processor, workstation, videophone, POS terminal, digital still camera, etc.

It is sectional drawing which shows schematic structure of the liquid crystal display device which concerns on this embodiment. It is an expanded sectional view of an opening. It is a top view of the illuminating device which concerns on this embodiment. 6 is a flowchart of a method for manufacturing a liquid crystal display device according to the present embodiment. The flowchart of the manufacturing method of the illuminating device which concerns on this embodiment. The schematic diagram in the manufacturing process of a light-guide plate is shown. The schematic diagram in the manufacturing process of a light-guide plate is shown. It is a top view of the illuminating device which concerns on a modification. It is sectional drawing of the illuminating device which concerns on a modification. It is an expanded sectional view of the opening part of the illuminating device which concerns on a modification. It is a figure which shows the modification of the micro lens shape of a scattering film. It is the schematic which shows the electronic device to which the illuminating device of this invention is applied.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Illuminating device, 11 Transparent plate, 12 Light source, 13 LED, 14 Scattering film, 15 Reflecting film, 16 Light guide plate, 20 Liquid crystal display panel, 100 Liquid crystal display device

Claims (9)

A light source;
A transparent plate-like transparent plate having the light source on an end surface;
A reflective film that reflects light, provided on a part of at least one of the planes facing the transparent plate;
A scattering film for scattering light provided at least in a region where the reflection film on the one surface of the transparent plate is not provided,
As the transparent plate is farther from the light source in the light emission direction of the light source, the range occupied by the region where the scattering film is disposed and the reflection film is not provided gradually increases.
The scatterer is provided with an unevenness in a portion corresponding to a region where the reflective film is not provided.   The lighting device according to claim 1, wherein the reflection film is provided on both surfaces of the transparent plate facing each other.   The lighting device according to claim 1, wherein a reflection sheet that reflects light is provided on the scattering film on the one surface side.   2. The reflective film according to claim 1, wherein the reflective film is provided on one surface of the flat surfaces of the transparent plate facing each other, and a full-surface reflective film that reflects light is provided on the entire surface of the other surface. The lighting device described in 1.   The lighting device according to claim 1, wherein the transparent plate is a glass substrate. A display panel;
An illuminating device according to any one of claims 1 to 5, which is used as a backlight of a display panel.   An electronic apparatus comprising the electro-optical device according to claim 6 in a display unit. A transparent plate-shaped transparent plate,
A reflective film that reflects light, provided on a part of at least one of the planes facing the transparent plate;
A scattering film for scattering light provided at least in a region where the reflection film on the one surface of the transparent plate is not provided,
As the transparent plate is farther from the light source in the light emission direction of the light source, the range occupied by the region where the scattering film is disposed and the reflection film is not provided gradually increases.
The light scattering plate, wherein the scattering film is provided with irregularities in a portion corresponding to a region where the reflection film is not provided. A display panel manufacturing process for manufacturing a display panel in which an electro-optical material is sealed between a pair of substrates;
A reflective film forming step of applying a metal film on one surface of the glass substrate and removing a part of the metal film to form a reflective film;
A scattering film forming step of forming a scattering film in a region where at least the reflection film on the one surface of the glass substrate is not provided;
A light guide plate forming step of cutting the glass substrate into a predetermined size to form a light guide plate;
A lighting device manufacturing process for manufacturing a lighting device by attaching a light source part to an end surface of the glass substrate;
And a mounting step of attaching the display panel to the lighting device.

Images