JP2003114430A - Front light type liquid crystal display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a front light type liquid crystal display with which low- visibility in observing image is reduced and reflection loss accompanying use of a light guiding plate is eliminated. SOLUTION: Light emitted from LEDs (light emitting diodes) 31, 35 is introduced into light scattering transmission bodies 32, 36 and emitted from emission surfaces 34, 38 to an air space AR. Most of the emitted light is made obliquely incident on the inner side face 21 of a protective panel 20 directly or indirectly. A traveling direction of illumination light made obliquely incident on an illumination light direction adjusting surface 11 of a liquid crystal display panel 10 is adjusted to be close to a direction vertical to the liquid crystal display panel 10 by refraction in incidence or by the refraction in incidence and by internal reflection after incidence and subsequently the illumination light is made incident on the inside of the liquid crystal display panel 10 operating with a reflective mode and contributes to displaying. Fine prism lines, Fresnel lens shaped element lines, minute island shaped protrusion groups and so on are formed on the illumination light direction adjusting surface 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front light type liquid crystal display having an illuminating means for inputting illuminating light from the front side (display side) to a liquid crystal display panel which can perform a display operation in a reflection mode. Regarding The liquid crystal display according to the present invention can be applied to, for example, display of images, character information, and the like on mobile phones, so-called mobile devices, watches, meters, and the like.

[0002]

2. Description of the Related Art A liquid crystal display panel for displaying an image, characters, etc. by inputting light from the front surface side (display surface side; the same applies hereinafter) is well known. This type of liquid crystal display panel is called a reflective liquid crystal display panel, and its display operation is called a reflective mode display operation. The reflective LCD panel is
A reflection plate is provided on the back side (opposite side to the display surface; the same applies hereinafter), and input light from the front side reaches this reflection plate through the liquid crystal cell and polarizing plates provided before and after it ( On the outward path, the reflected light generated there passes through the liquid crystal cell, the polarizing plate and the like again (however, the passage order is reverse) and is output from the front surface.

There is also a type in which a half mirror is used for the reflecting plate and light can be input (backlighting) from the rear side of the half mirror. External light (sunlight, indoor illumination light, etc.) can be used for light input from the front side of the liquid crystal display panel, but it is often not possible to display with sufficient clarity only with external light, and in the evening and at night. , Outside light itself is insufficient in the tunnel. In order to prepare for this situation, it is common to equip the liquid crystal display with an illumination means using a light source element such as an LED (light emitting diode) or a cold cathode tube.

In this case, since the light source element cannot be placed on the front surface of the liquid crystal display panel (it interferes with the display),
A method of arranging a light source element in the vicinity of the peripheral edge on the front surface side of the liquid crystal display panel and changing the direction of light supplied from the light source element to incline it toward the front surface of the liquid crystal display panel is adopted.

A light guide plate is widely used for this direction change. FIG. 1 is a partial cross-sectional view showing a main part of a conventional liquid crystal display using a light guide plate for changing the direction of illumination light. Referring to FIG. 1, a liquid crystal display includes a reflective liquid crystal panel 100 and a light guide plate 9 disposed in front of the liquid crystal panel 100.
0, a light source L arranged near the end face of the light guide plate 90, and a protection panel 80 provided on the front side of the light guide plate 90 (the side opposite to the liquid crystal display panel 100).

The liquid crystal panel 100 comprises a light scattering film (light diffusing sheet) 101, a polarizing plate 102, a first glass substrate 103, a color filter 104, a liquid crystal cell 105, a reflective electrode 106 and a second glass substrate 107. ing. The light scattering film (light diffusion sheet) 101 may be omitted. The color filter 104 has three primary color regions R, G, and B. Since the structure and operating principle of such a liquid crystal panel are well known, detailed description thereof will be omitted.

The light guide plate 90 is made of a transparent light guide, and a large number of fine protrusions 92 are formed on its back surface (surface opposite to the liquid crystal display panel 100) 91. The surface 93 where the light guide plate 90 faces the liquid crystal display panel 100 is a flat surface and functions as an emission surface from which the light input to the liquid crystal display panel 100 is output. The emission surface 93 is usually covered with an antireflection film. The light source L uses, for example, a cold cathode tube or an LED as a light emitting source, and constitutes a so-called sidelight type surface light source device together with the light guide plate 80.

As indicated by the symbols H, J, and K, the light guide plate 9
When the light H propagating in 0 enters the fine protrusions 92, it is converted into light J directed to the emission surface 93. The light J is emitted from the exit surface 93.
Is emitted almost vertically from and enters the liquid crystal panel 100.

The light J is a scattering film (light diffusion sheet) 1
01, the polarizing plate 102, the first glass substrate 103, the color filter 104, the liquid crystal cell 105, and the reflective electrode 106.
Is reflected by. The reflected light returns to the liquid crystal cell 105,
It reaches the polarizing plate 102 through the color filter 104 and the glass substrate 103. As is well known, transmission / blocking of the polarizing plate 102 is determined depending on the driving state (voltage) of the reflective electrode 106 of the corresponding pixel.

If the driving state (voltage) of the reflective electrode 106 allows the light to pass through the polarizing plate 102, it is emitted as display light K through the scattering film (light diffusion sheet) 101, the light guide plate 90, and the protective panel 80. It should be noted that instead of forming a large number of fine protrusions on the back surface of the light guide plate, fine gentle slopes and steep slopes are alternately formed, and internal reflection of the steep slopes is used to generate illumination light toward the liquid crystal display panel. There is also.

[0011]

However, the conventional structure of the front light type liquid crystal display using the light guide plate as described above has the following problems. (1) The light guide plate 90 includes the cover panel 80 and the liquid crystal display panel 1.
00, the distance (thickness direction) between the image forming surface of the liquid crystal display panel 100 (the front surface of the polarizing plate 102 in this example) and the front surface 81 of the coating panel 80 becomes considerably large. In this example, the distance is equal to the cover panel 80.
Thickness + gap AR1 between cover panel 80 and light guide plate 90
Thickness + light guide plate 90 thickness + air gap AR2 between light guide plate 90 and scattering film 101 + scattering film 101 thickness.

Therefore, the observer has a feeling of seeing an image formed deep in the display. For example, this is similar to the feeling of observing letters and pictures on a plate that sank at the bottom of a deep pond, a kind of "difficult to see".
Is accompanied by.

(2) Since the light guide plate 90 is interposed between the cover panel 80 and the liquid crystal display panel 100, a considerable loss occurs in the display light K. In particular, the display light K has a space (air layer) AR at two locations on the light emitting surface 93 side and the back surface 91 side of the light guide plate 90.
2. Since it has to pass through the optical interface with AR1, the reflection loss tends to increase.

Therefore, an object of the present invention is to provide a front light type liquid crystal display in which the above-mentioned unsightlyness is reduced when observing an image and the reflection loss due to the use of the light guide plate is eliminated.

[0015]

According to the present invention, there is provided a liquid crystal display panel capable of performing a display operation in a reflection mode, a translucent protective panel provided on the front side of the liquid crystal display panel with a gap therebetween, and The present invention is applied to a front light type liquid crystal display including a liquid crystal display panel and an illuminating means for inputting illumination light from the front side.

According to a feature of the invention, the lighting means comprises:
Illumination light reflection surface provided by the surface of the protection panel on the side of the air gap, and illumination for supplying illumination light from at least a part of the periphery of the air gap so that oblique incidence to the illumination light reflection surface occurs through the air gap. A light supply unit and an illumination light direction correction unit provided on the front surface side of the liquid crystal display panel so as to be in contact with the gap are included.

The illuminating light direction correcting means is provided with a large number of fine concavo-convex elements, and the fine concavo-convex elements have a traveling direction of light obliquely incident through the voids at least at the time of incidence on the concavo-convex elements. Through a direction correction process including refraction, the liquid crystal display panel has a function of being corrected so as to approach a direction perpendicular to the extending surface of the liquid crystal display panel and then directed to the inside of the liquid crystal display panel.

Here, it is preferable that the fine concavo-convex element is provided integrally with the liquid crystal display panel.

In a typical example of the direction correcting process, the illumination light including the internal reflection after being incident on the concave-convex element is directed to the inside of the liquid crystal display panel after the internal reflection. In another typical example of the direction correction process,
The direction correction process generates illumination light directed to the inside of the liquid crystal display panel due to the refraction at the time of incidence. In the former case, a prism array composed of a pair of slopes can be used as the fine concavo-convex element. Also, in the latter case, for example, Fresnel lens-like unevenness provided on the liquid crystal display panel can be used.

As described above, according to the present invention, the use of the light guide plate in the conventional structure is stopped, and the illuminating light direction correcting means is provided on the liquid crystal display panel, and the illuminating light direction correcting means and the protection panel face each other with a gap therebetween. A matching structure is adopted. Then, the illumination light is sent from the peripheral portion of this gap in a manner in which the light obliquely incident on the protection panel is generated, and the illumination light is directed to the illumination light direction correcting means with the help of the surface reflection of the light obliquely incident on the protection panel. Make it obliquely incident. The light incident on the illumination light direction correcting means is subjected to the direction correction through the above-described direction correction process, input to the inside of the liquid crystal display panel, and contributes to the display in a known manner.

[0021]

FIG. 2 is a partially cutaway perspective view showing the schematic arrangement of one embodiment of the present invention. Referring to FIG. 2, the liquid crystal display includes a reflective liquid crystal panel 10.
A protective panel 80 provided with a space (air layer) AR sandwiched on the front side (display side) thereof, and a light source section (illumination light supply means) for sending diffused light from at least a part of the periphery of the space AR to the space AR. ) Is provided.

In this embodiment, the light source portions are provided on both sides of the air gap AR. The light source section on the left side, which is shown partially broken, includes an LED 31, a rod-shaped light-scattering light guide 32, and
A reflection layer (for example, a silver foil, an aluminum foil, a white PET film) 33 that covers the back surface (the surface opposite to the air gap AR) of the light scattering guide 32 is provided. The LED 31 is a light-scattering light guide 32.
Is provided on one end face of the light-scattering light-guiding member 32 so as to send out light along the lengthwise direction thereof. The front surface (the surface on the side of the air gap AR) 34 of the light scattering guide 32 is an emission surface opened toward the air gap AR, and in some cases, the emission surface 3
A prism array for adjusting the emission direction from 8 may be provided, or a roughened surface may be provided for promoting emission.

The light source section on the right side is the same as the light source section on the left side except for the difference in the left and right directions. That is, the LED 35, the rod-shaped light-scattering light guide 36, and the reflective layer (for example, silver foil, aluminum foil, white PET film) 37 that covers the back surface (the surface on the side opposite to the air gap AR) of the light-scattering light guide 36.
Is equipped with. The LED 35 is provided on one end surface of the light scattering guide 36 so as to emit light along the length direction of the light scattering guide 36.

The front surface (the surface on the side of the air gap AR) 38 of the light scattering guide 36 is an emission surface opened toward the air gap AR. Depending on the case, a prism array for adjusting the emission direction from the emission surface 38 may be provided, or a roughened surface may be provided for promoting emission. The light-scattering light guides 32 and 36 are, for example, a transparent resin such as PMMA in which particles having a different refractive index from that of the resin are uniformly dispersed, and the material composition and manufacturing method thereof are well known.

The protective panel 20 is a transparent plate made of, for example, acrylic resin, and the inner side surface 21 and the front surface (display side surface) of the liquid crystal display panel 10 are voids AR formed by an air layer.
They are facing each other across. Here, one of the important differences from the conventional structure (see FIG. 1) is that the light guide plate is not interposed between the liquid crystal display panel 10 and the protection panel 20. The liquid crystal panel 10 is a liquid crystal display panel that operates in a reflection mode.
The front surface (the surface on the side of the air gap AR) is an illumination light direction correction surface 11 provided with an illumination light direction correction means.

Various types of illuminating light direction correcting means can be adopted as will be described later, but in each aspect, a large number of fine concavo-convex elements are provided. Then, these fine concavo-convex elements correct the correction direction of the illumination light so as to approach the direction perpendicular to the extending surface of the liquid crystal display panel 10 through at least the direction correction process including the refraction at the time of oblique incidence from the air gap AR. Then, the liquid crystal display panel 10 is turned to the inside.

Here, the illumination light direction correction surface 1 from the air gap AR
The oblique incidence on 1 occurs as follows. When the LEDs 31, 35 of the left and right light sources are turned on, the emitted light is introduced into the light scattering guides 32, 36, respectively. The light introduced into the light-scattering light guides 32 and 36 is
While being scattered in 2, 36, the light propagates internally so as to separate from the LEDs 31, 35.

As is well known, in this process, the emission surfaces 34, 3 are
8 and the reflection layers 33 and 37 are repeatedly reflected and reciprocated, but a part of the light gradually exits the gap AR on the emission surfaces 34 and 38.
It is emitted toward. There is a certain degree of angular spread in the outgoing direction of the outgoing light, and a part of it is directly incident on the inner side surface 21 of the protection panel 20. Further, a considerable part of the remaining light is reflected (once or plural times) on the illumination light direction correction surface 11 of the liquid crystal display panel 10 and then enters the inner side surface 21. Inner surface 21 that combines direct and indirect incidence
Almost all of the incident rays are “obliquely incident”, and most of them are incident at a very shallow angle (that is, the incident angle measured from the normal direction is close to 90 degrees).

Therefore, the reflection efficiency on the inner side surface 21 becomes high. It should be noted that some of the light once enters the protective panel 20, is internally reflected by the outer surface 22, and then returns to the air gap AR. In this way, most of the light from the light-scattering light guides 32 and 36 is “diagonally incident” on the illumination light direction correction surface 11.
Here, this "oblique incidence" is mainly performed at a shallow angle with respect to the general surface of the illumination light direction correction surface 11 (extended surface in which irregularities described later are ignored) (inner surface 21 of the protection panel 20).
Similar to oblique incidence on.

Obviously, such obliquely incident light having a shallow angle cannot be substantially used as the input light to the inside of the liquid crystal display panel 10 as it is. The present invention overcomes this difficulty by utilizing a large number of fine relief elements. In the present embodiment, the front surface of the liquid crystal display panel 10 itself is the illumination light direction correction surface 11, and the illumination light direction correction surface 11 is provided with a large number of fine concavo-convex elements. Hereinafter, specific examples of the fine concavo-convex elements formed on the illumination light direction correction surface 11 will be described with reference to FIGS.
Will be described in addition to the reference diagram. Note that, in FIGS. 4 to 8, the structure of the liquid crystal display panel 10 itself other than the portion of the fine concavo-convex element is not shown.

First, FIG. 3 shows a partial cross-sectional view of the structure when the first example of the fine concavo-convex element is adopted. In this example, unlike the liquid crystal display panel 100 (see FIG. 1) described in the conventional example, the scattering film (light diffusion sheet 101) is not provided. A large number of fine prism array elements PR are integrally formed on the polarizing plate 12. However, broken line 12
A structure in which a prism sheet is attached to the polarizing plate 12 by using the portion indicated by 1 as an adhesive layer may be used.

Each prism array element PR has a pair of slopes SL1, S.
L3, and the pair of inclined surfaces SL1 and SL3 extend substantially parallel to the light scattering guides 32 and 36. The height of the prism array element PR (the distance between the broken lines 122 and 123) is, for example, about several tens of μm, and the repeating pitch is also, for example, about several tens of μm. The prism apex angle is designed to be an appropriate value between about 60 degrees and 110 degrees.

Other parts of the liquid crystal display panel 10 may have the same structure as the conventional structure (see FIG. 1). That is, in addition to the polarizing plate 12, the first glass substrate 13, the color filter 1
4, liquid crystal cell 15, reflective electrode 16, second glass substrate 1
It is composed of 7. As described above, the color filter 14 has the regions R, G and B of the three primary color regions. Here, in this example, as the representative obliquely incident light to the prism array element PR formed on the illumination light direction correction surface 11, rays P1 (derived from the LED 31) and Q1 (LE
(Derived from D35) can be considered. Representative ray P1,
Q1 is reflected by the inner surface 21 of the protection panel 20 and reflected by the light beam P.
2 and Q2, and enter the slope SL1 or SL2 (obliquely enter the illumination light direction correction surface 11).

At this time of incidence, refraction occurs except for the vertically incident components on the slopes SL1 and SL2. However, in this example, the direction correction due to the refraction upon incidence is generally small. The light rays P2 and Q2 are internally reflected by the other slant surface SL2 or SL1 after being incident on the prism array element PR and largely change their traveling directions, and become light rays P3 and Q3 which travel to the inside of the liquid crystal display panel 10 in a direction nearly vertical. .

The light rays P3 and Q3 pass through the polarizing plate 12, the first glass substrate 13, the color filter 14 and the liquid crystal cell 15 and are reflected by the reflection electrode 16. The reflected light reaches the polarizing plate 12 again via the liquid crystal cell 15, the color filter 14, and the glass substrate 13. As is well known, transmission / blocking of the polarizing plate 12 is determined depending on the driving state (voltage) of the reflective electrode 16 of the corresponding pixel.

If the driving state (voltage) of the reflecting electrode 16 allows the transmission of the polarizing plate 12, the prism array element PR and the space A are formed.
It is emitted as display light through R and the protection panel 20. It should be noted that some refraction occurs when it goes out to the air gap AR from the slopes SL1 and SL2 of the prism array element PR and when it passes through the inner side surface 21 and the outer side surface 22 of the protection panel 20, but it causes a hindrance to the display. Not big.

In this example, the slopes SL1 and SL2 are symmetrical straight slopes having an isosceles equilateral triangular cross section.
As shown in, slanted slope pairs SL4, SL
3 can also be used. This is a second example. In general, when the illumination light direction correction surface 11 using the asymmetric prism element array as in the second example is supplied with light from one side (for example, when the illumination section below the LED 35 on the right side is not provided). Suitable for In this case as well, the main direction correction occurs due to internal reflection at the slope SL4 of the representative ray P2 after incidence. The representative ray P3 after the internal reflection contributes to the display as in the first example.

Next, FIG. 5 shows an example in which a symmetric, semi-cylindrical fine cylindrical lens-shaped element is used. This is a third example.
In general, this third example is suitable when light is supplied from both sides, as in the first example. Also in this case, the main direction correction occurs due to internal reflection on the curved surface CV of the representative ray P2 after incidence. The representative ray P3 after the internal reflection contributes to the display as in the first example.

FIG. 6 shows an example in which an asymmetrical kamaboko-shaped fine lens-shaped element is used. This is a fourth example. In general, the fourth example is suitable for the case where light is supplied from one side (for example, when the illumination section below the LED 35 on the right side is not provided) as in the second example. Also in this case, the main direction correction occurs due to the internal reflection on the curved surface CV2 of the representative ray P2 after entering the curved surface CV1. The representative ray P3 after the internal reflection contributes to the display as in the first example.

Next, FIG. 7 shows an example in which a large number of so-called Fresnel lens-shaped fine element rows FL are formed. This is a fifth example. In general, the fifth example is suitable for the case where light is supplied from one side (for example, when the illumination section below the LED 35 on the right side is not provided), like the second and fourth examples.

In this case, unlike the first to fourth examples, the direction correction is caused by the refraction of the representative ray P2 which occurs upon incidence on the inclined surface (Fresnel lens element surface) SL5. The representative ray P2 after refraction contributes to the display similarly to the first example.

In the above-mentioned first to fifth examples, all the fine optical elements are formed in a thin row, but as shown in FIG. 8, a large number of minute island-shaped projections ST are formed on the liquid crystal display panel 10.
It may be formed on top. A trowel is a sixth example. The sixth example is suitable for both cases where light is supplied from one side (for example, when the illumination section below the LED 35 on the right side is not provided) and where light is supplied from both sides. Can be used. Further, generally speaking, if the shape of the projection is isotropic (for example, conical), the direction correction action can be equally exerted on light coming from any direction. It can be applied without affecting the sex. When this island-shaped projection is used, the main direction change is usually performed by internal reflection after incidence.

In any of the above examples, since the light guide plate is not interposed between the protection panel 20 and the liquid crystal display panel 10, the observer does not feel the depth of the displayed image. Further, the two interfaces where the void and the light guide plate are in contact with each other are eliminated, and the reflection loss of the display light is also reduced.

The embodiment described above is not intended to limit the present invention. For example, the following modifications are allowed.

(1) In the above embodiment, the light is supplied by the LED.
However, this is merely an example, although it was performed via an intermediate light source using a light-scattering light guide. For example, instead of using the intermediate light source, LEDs may be arranged around the air gap AR to directly supply light. It is also possible to use cold cathode tubes.

(2) The extending direction of the row-shaped fine optical elements is
It may be changed if necessary. For example, when light is supplied from the LEDs arranged at the corners, the fine optical element rows (for example, prism rows and Fresnel lens element rows) may be formed in a concentric circle shape centering on the LEDs.

(3) Other related technology in the field,
For example, it is possible to use a weak scattering sheet, an antireflection film, or a monochrome display liquid crystal instead of the color display liquid crystal. Further, it is possible to use a liquid crystal display panel of a type that is used together with backlighting.

[0048]

According to the present invention, since the light guide plate is not interposed between the protective panel and the liquid crystal display panel, the distance between the protective panel and the liquid crystal display panel can be reduced by that much. Therefore, the unsightlyness described above is alleviated. Further, the two interfaces where the void and the light guide plate are in contact with each other are eliminated, and the reflection loss of the display light is also reduced.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a main part of a conventional front light type liquid crystal display using a light guide plate for changing the direction of illumination light.

FIG. 2 is a partially cutaway perspective view showing a schematic arrangement of an embodiment of the present invention.

FIG. 3 is a partial cross-sectional view illustrating a first example of a fine concavo-convex element.

FIG. 4 is a partial cross-sectional view illustrating a second example of a fine concavo-convex element.

FIG. 5 is a partial cross-sectional view illustrating a third example of a fine concavo-convex element.

FIG. 6 is a partial cross-sectional view illustrating a fifth example of a fine concavo-convex element.

FIG. 7 is a partial cross-sectional view illustrating a sixth example of a fine concavo-convex element.

FIG. 8 is a partial perspective view illustrating a fourth example of the fine concavo-convex element.

[Explanation of symbols]

10,100 LCD display panel 11 Illumination direction correction surface 12, 102 Polarizer 13, 17, 103, 107 glass substrate 14, 104 color filter 15,105 Liquid crystal cell 16, 106 Reflective electrode 20,80 Protective panel 21 Inside of protective panel (oblique reflection surface) 22 Outside surface of protective panel (oblique reflection surface) 31,35 LED 32,36 Light scattering light guide 33, 37 reflective layer 34, 38 exit surface of light scattering guide 90 Light guide plate 91 Back of light guide plate 92 Micro protrusions formed on the back surface of the light guide plate 93 Light exit surface of light guide plate 101 Scattering film (light diffusion sheet) CV, CV1, CV2 curved surface FL Fine Fresnel lens array element P1 and Q1 representative rays (immediately before entering the protective panel) P2, Q2 representative rays (after reflection on the protective panel) P3, Q3 representative rays (after internal reflection) PR Fine prism array element SL1, SL2, SL3, SL4 slope ST island projection

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G09F 9/35 G09F 9/35 // F21Y 101: 02 F21Y 101: 02 (72) Inventor Higuchi Eisaburo Tokyo 2-929 Hiratsuka, Shinagawa-ku Nitto Jushi Industrial Co., Ltd. (72) Inventor Akihiro Tagaya 6-23-5 Konandai, Konan-ku, Yokohama-shi, Kanagawa 2F042 BA03 BA14 BA20 CA12 CA13 CA17 2H091 FA23X FA31X FA32X FA42X FA45X FD06 FD22 LA03 LA16 5C094 AA01 AA10 AA48 BA43 CA19 CA24 EA04 EA05 EA06 ED01 ED03 ED11 ED14 FA01 FA02 5G435 AA03 AA04 BB12 BB16 CC12 EE22 FF02 FF05 FF06 FF08 FF11 GG03 GG07 GG12 GG23 HH02 HH04 LL07

Claims (4)

[Claims] 1. A liquid crystal display panel capable of performing a display operation in a reflection mode, a translucent protective panel provided on the front side of the liquid crystal display panel with a gap therebetween, and illuminating the liquid crystal display panel from the front side. A front-light type liquid crystal display, comprising: an illuminating means for inputting light; the illuminating means comprising an illuminating light reflecting surface provided by a surface of the protective panel on the side of the air gap, and the illuminating light through the air gap. Illumination light supply means for supplying illumination light from at least a part of the periphery of the gap so that oblique incidence on the light reflecting surface occurs, and illumination light provided on the front side of the liquid crystal display panel so as to contact the gap. Direction rectifying means; the illuminating light direction correcting means comprises a large number of fine concavo-convex elements, and the fine concavo-convex elements at least indicate a traveling direction of light obliquely incident through the gap. Through a direction correction process including refraction upon incidence on the concave-convex element, the correction is performed so as to approach a direction perpendicular to the extending surface of the liquid crystal display panel, and then the liquid crystal display panel is directed toward the inside. Front light type liquid crystal display. 2. The front light type liquid crystal display according to claim 1, wherein the fine concavo-convex element is formed integrally with the liquid crystal display panel. 3. The liquid crystal display panel according to claim 1, wherein the direction correction process includes internal reflection after entering the concave-convex element, and the illumination light after the internal reflection is directed to the inside of the liquid crystal display panel. Front light type liquid crystal display. 4. The front light type liquid crystal display according to claim 1, wherein the direction correcting process is to generate illumination light directed to the inside of the liquid crystal display panel by refraction at the time of incidence. .