JP4221410B2 - Liquid crystal display - Google Patents

Description

  The present invention relates to a liquid crystal display device, and more particularly to a front light type liquid crystal display device.

  Liquid crystal display devices are widely used for monitors of office automation equipment and the like because of their small size, thinness, and low power consumption. In this liquid crystal display device, liquid crystal is sandwiched between opposing substrates, and the alignment direction of liquid crystal molecules using an electric field generated by a voltage applied between electrodes provided on each substrate or between electrodes provided on one substrate. Main components are a liquid crystal display panel that controls the light source, an optical member such as a light source that illuminates the liquid crystal panel, a light guide plate, and a diffusion plate, and a housing that supports them.

  Also, mobile terminal devices such as mobile phones and PDAs use liquid crystal display devices as display means because of their thin and light features. These mobile terminal devices can be further miniaturized while handling information. The amount increases, and the display area needs to be enlarged so that information such as web can be displayed. In order to meet such demands, improvements including not only the structure of the liquid crystal display panel but also the mounting and assembly methods of the light source and optical members have been made.

  As a method of illuminating the liquid crystal display device, light is irradiated from the back side of the liquid crystal panel, and a backlight method for visually recognizing light transmitted through the liquid crystal panel, and light is irradiated from a light guide plate provided on the front surface of the liquid crystal panel, There is a front light system for visually recognizing the light reflected by the liquid crystal panel, but the mobile terminal device mainly employs one of these two systems.

  In this front light system, a light source is attached along the side edge of the light guide plate, and the light emitted from the light source is guided to the liquid crystal panel by the fine unevenness provided on the viewing surface side of the light guide plate and reflected by the liquid crystal panel. In order to control the incident direction of light, the liquid crystal display panel and the light guide plate are fixed using an adhesive, an adhesive, or the like so as to be substantially parallel.

  As for fixing the liquid crystal panel and the light guide plate, there are a method of fixing the entire surface including the display area with an adhesive and a method of fixing only a peripheral region outside the display area. As a method for fixing the entire surface, there is JP-A-2002-23155, etc., and according to this publication, in the front light method, reflection increases at the interface due to air interposed between the light guide plate and the liquid crystal panel, It is described that the reflected light overlaps with the original display image by the liquid crystal display panel and causes white blurring and a decrease in contrast.

  That is, the above publication aims to suppress whiteness and contrast reduction in the display area, and to prevent reflection at the interface between the light guide plate and air in the display area, the entire surface between the light guide plate and the liquid crystal display panel. The adhesive is interposed, and the relationship between the refractive index of the adhesive and the refractive index of the light guide plate is limited (the refractive index of the light guide plate is 1.49 or more and the refractive index of the adhesive is 1.48 or less). Light having a large angle is totally reflected at the interface between the light guide plate and the adhesive to prevent the light having a large incident angle from entering the display area.

  In the method of bonding the entire surface of the liquid crystal display panel and the light guide plate with an adhesive as described above, the light emitted from the light source passes through the adhesive layer twice, and an adhesive having a high transmittance is used. Even if it is, the absorption of light by the adhesive is large, resulting in a decrease in luminance. Further, when the light amount of the light source is increased in order to improve the luminance, the size and power consumption of the light source increase, which is not preferable as a liquid crystal display device for portable terminal devices.

  Therefore, in the portable terminal device, a method of fixing the light guide plate and the liquid crystal display panel only in the peripheral region outside the display area is used. A liquid crystal display device having this structure will be described with reference to FIG. FIG. 8 is a cross-sectional view showing the structure of a conventional front light type liquid crystal display device, showing the structure in the vicinity of the display area end of the mobile phone.

  As shown in FIG. 8, the front light type liquid crystal display device displays a liquid crystal panel 2 having a liquid crystal sandwiched between opposing substrates, a light source 4 that illuminates the liquid crystal panel 2, and light emitted from the light source 4. The light guide plate 3 that is guided to the area 8 side, reflected by fine unevenness provided on the viewing surface side, and incident on the liquid crystal panel 2 and the housing 1 that fixes them are the main components.

  Moreover, although the opposing surfaces of the liquid crystal panel 2 and the light guide plate 3 are both formed flat, both are not perfect planes. Therefore, when both are in close contact, the Newton ring is visually recognized around the contact portion. Therefore, between the liquid crystal panel 2 and the light guide plate 3, the front light is fixed and the impact resistance is improved, and the distance between the liquid crystal panel 2 and the light guide plate 3 is maintained on one side or both sides of the base material 10. A spacing member 5 such as a double-sided tape provided with an adhesive material 9 is provided.

JP 2002-23155 A (page 3-7, FIG. 1)

  As the adhesive material 9 provided on one or both surfaces of the spacing member 5, an acrylic or silicon adhesive material is generally used, while the light guide plate 3 is also often made of acrylic. Therefore, the refractive indexes of the light guide plate 3 and the adhesive material 9 are approximated, and the light hitting the surface of the adhesive material 9 from the light guide plate 3 does not totally reflect and enters the adhesive material 9 as shown in FIG. It propagates to the end of the adhesive material 9 while absorbing and irregularly reflecting.

  The interval holding member 5 such as a double-sided tape is formed by cutting the original tape into a predetermined size, but the adhesive material 9 protrudes from the substrate 10 by 20 to 30 μm or more during the processing, and the adhesive When the light incident on the material 9 reaches the protruding portion at the end of the adhesive material 9, a phenomenon occurs in which the light is emitted from the protruding portion to emit light in a linear or dot shape (hereinafter referred to as a bright line). The problem arises.

  Here, in the case of a liquid crystal display device used for a monitor of an OA device or the like, the size of the device is not so severely limited. Therefore, the spacing member 5 is separated from the display area 8 or the front end portion of the housing 1 and retracted to the back. In the case of a device having a small size and a large display screen such as a portable terminal device, the distance between the protruding portion of the adhesive material 9 and the tip portion of the housing 1 can be formed. (W in the figure) cannot be set large, and when the liquid crystal display device is viewed obliquely, the protruding portion of the adhesive material 9 becomes a bright line, and the appearance of the display is significantly deteriorated.

  Further, since the refractive index of the adhesive material 9 and the refractive index of the light guide plate 3 are close to each other, the light incident in the direction of the spacing member 5 is almost incident on the adhesive material 9, and the light propagating to the back of the light guide plate 3. There is also a problem that the amount of light is reduced, resulting in a decrease in light use efficiency and a deterioration in luminance and luminance uniformity.

  Further, in the conventional structure, in order to eliminate the bright line, the double-sided tape with the sticking out of the adhesive material 9 is judged to be defective, so that the production yield of the double-sided tape is deteriorated, resulting in the cost of the liquid crystal display device. Will rise.

  The present invention has been made in view of the above-described problems, and its main purpose is to prevent the generation of bright lines at the edge of the adhesive member of the spacing member, and to improve the luminance and luminance uniformity. The object is to provide a front-light type liquid crystal display device.

In order to achieve the above object, the liquid crystal display device of the present invention is a liquid crystal display device of a front light type in which a light guide plate having a light source is disposed on the side end of the liquid crystal panel. The panel and the light guide plate are outside the display area, and are fixed with a spacing member provided with a pressure sensitive adhesive on the surface of the base material while maintaining a predetermined spacing . The space holding member protrudes from the base material, and the base material and the adhesive material of the space holding member contain a light-absorbing substance.

  In this invention, the said space | interval holding member can be set as the structure provided in the substantially all periphery of the said light-guide plate.

  As described above, according to the present invention, the structure described above suppresses light from entering the pressure-sensitive adhesive material of the spacing member, and even when light enters the pressure-sensitive adhesive material, it absorbs efficiently inside the pressure-sensitive adhesive material. It is possible to prevent the problem that the end of the material emits light, thereby improving the image quality, that is, the luminance uniformity of the liquid crystal display device, and improving the luminance by increasing the light propagating in the light guide plate. be able to.

  The front light type liquid crystal display device of the present invention has the following effects.

  The first effect of the present invention is that the image quality (luminance uniformity) of the liquid crystal display device can be improved.

  The reason is that even if the adhesive material protrudes from the base material of the spacing member such as the double-sided tape, the protruding adhesive material does not emit light, so that the bright line can be seen when viewed from an oblique direction with respect to the display surface. This is because it does not occur and the appearance can be improved.

  The second effect of the present invention is that the brightness of the front light can be improved.

  The reason is that the refractive index of the adhesive material is made smaller than that of the light guide plate, a reflective material is provided in a region facing the position where the interval holding member is provided on the light guide plate, or fine irregularities are formed around the light guide plate. By forming a non-flat region, the light incident in the direction of the spacing member can be reflected on the light guide plate, or the incidence of light in the direction of the spacing member can be suppressed and the light utilization rate can be improved. is there.

  The third effect of the present invention is that the yield of the double-sided tape is improved and the cost of the liquid crystal display device is reduced.

  The reason is that, even if the adhesive material protrudes from the base material of the double-sided tape, the protruding adhesive material does not emit light, so it is not necessary to make the adhesive material protruding when forming the spacing member defective, and the yield of the double-sided tape It is because it can improve.

  In a preferred embodiment of the front light type liquid crystal display device according to the present invention, a light guide plate provided on the viewing side of the liquid crystal panel is used, with a spacing member provided with an adhesive material at least on the light guide plate side, In the structure that is fixed around the outside of the display area, an adhesive material having a refractive index smaller than the refractive index of the light guide plate is used, or a light-absorbing member or a reflective member is provided in a region facing the adhesive material placement position of the light guide plate By suppressing the incidence of light from the light guide plate to the adhesive material, and by using an adhesive material containing a light-absorbing material, the light incident on the adhesive material from the light guide plate is absorbed. It is possible to provide a liquid crystal display device with high display quality by suppressing generation of bright lines at the protruding portion. Furthermore, the same effect can be obtained by adopting a configuration in which fine unevenness provided on the viewing side of the light guide plate is not formed in a region facing the adhesive material disposition position.

  In order to describe the above-described embodiment of the present invention in more detail, a front light type liquid crystal display device according to a first example of the present invention will be described with reference to FIGS. FIG. 1 is a plan view showing a structure of a display section of a front light type liquid crystal display device according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view showing the structure in the vicinity of the end portion of the display area along the line AA in FIG. 1, and FIG. 2B is an enlarged view of a portion surrounded by a circle in FIG.

  The liquid crystal display device of this embodiment includes a liquid crystal panel 2 having a liquid crystal sandwiched between opposing substrates, and a light source 4 at the side end, and propagates light emitted from the light source 4 to the display area 8 side for visual recognition. The light guide plate 3 that illuminates the liquid crystal panel 2 in the display area 8 by being reflected by the fine unevenness provided on the surface side, and the housing 1 that fixes them are the main components, and the liquid crystal panel 2 and the light guide plate 3 A low refractive index adhesive material 9a is provided on one or both sides of the substrate 10 for the purpose of fixing the front light, improving impact resistance, maintaining the distance between the liquid crystal panel 2 and the light guide plate 3, and the like. An interval holding member 5 is provided.

  As shown in the prior art, in a front-light type liquid crystal display device, a method of fixing the entire display area between the liquid crystal panel 2 and the light guide plate 3 with an adhesive, and only a peripheral region outside the display area 8 is double-sided. There is a method of fixing with an interval holding member 5 such as a tape, and in the method of fixing the entire surface with an adhesive, the luminance decreases due to light absorption by the adhesive. Therefore, a structure is used in which the display area 8 is not provided with an adhesive and the spacing member 5 is provided only in the peripheral region outside the display area 8.

  The spacing member 5 not only fixes the space between the liquid crystal panel 2 and the light guide plate 3 but also prevents the occurrence of Newton rings due to the opposing surfaces of the liquid crystal panel 2 and the light guide plate 3 being not completely flat. Therefore, it aims at ensuring a predetermined space | interval between both. Therefore, the space | interval holding member 5 becomes a structure provided with the base material 10 which consists of PET (polyethylene terephthalate), vinyl chloride, etc. for ensuring a space | interval, and the low refractive index adhesive material 9a of the single side | surface or both surfaces.

  In the following description, a case where a double-sided tape is used as the gap holding member 5 will be described. However, the gap holding member 5 is not limited to the double-sided tape, and a base material capable of ensuring the gap between the liquid crystal panel 2 and the light guide plate 3. What is necessary is just to provide the adhesive member which can fix 10 and both.

  The double-sided tape used as the spacing member 5 is usually formed by cutting a raw tape of a predetermined size by a method such as die cutting. At that time, the pressure at the time of cutting and the adhesive material 9a The adhesive part is widened by the adhesiveness and protrudes by about 20 to 30 μm. Therefore, when the liquid crystal panel 2 and the light guide plate 3 are fixed, a protruding portion of the adhesive material 9a is formed on the display area side, and when the light emitted from the light source 4 enters the adhesive material 9a from the light guide plate 3, the adhesive material 9a. There is a problem in that it diffuses and propagates inside, emits light at the protruding portion of the end, and produces a bright line. In the figure, the protruding portion is displayed only on the display area 8 side of the pressure-sensitive adhesive material 9a on the light guide plate 3 side in order to express the feature of the present invention remarkably, but other portions (outer portion or liquid crystal panel 2 side) are displayed. In some cases, a protruding portion is also formed on the adhesive material 9a).

  As a method for suppressing the generation of the bright line, if the distance (W in FIG. 8) between the end of the display area 8 of the double-sided tape and the protruding portion of the housing 1 is increased, the protruding portion of the adhesive material 9a can be reduced. Even if it emits light, it can be made invisible. However, in portable terminal devices such as mobile phones and PDAs, the external dimensions of the device are becoming smaller and the display area 8 is required to be enlarged so that a large amount of information can be displayed. Accordingly, the distance between the end of the double-sided tape and the protruding portion of the housing is inevitably narrow, and the influence of the bright line at the protruding portion of the adhesive material 9a appears remarkably. In addition, even if the protruding portion of the adhesive material 9a is covered, the light incident on the adhesive material 9a is light that is not used for display on the screen, so that the light utilization rate decreases and the luminance decreases. The problem cannot be solved.

  Therefore, in the present embodiment, in order to prevent the generation of bright lines without securing a large space between the end of the double-sided tape and the housing 1 in the structure in which the double-sided tape is provided only in the peripheral region outside the display area 8. The refractive index of the adhesive material 9 a is set to be smaller than the refractive index of the light guide plate 3 so that light does not enter the adhesive material 9 a from the light plate 3.

  Specifically, acrylic is generally used as the material of the light guide plate 3, and its refractive index is about 1.5. Therefore, in order to make the refractive index of the adhesive material 9a lower than the refractive index of the light guide plate 3, a fluorine compound-containing adhesive material is used instead of the acrylic adhesive material or the silicon-based adhesive material normally used as the adhesive material 9a. Used. The refractive index of the fluorine compound-containing pressure-sensitive adhesive material varies depending on the concentration of the fluorine compound contained, but is generally about 1.3 to 1.4.

  Accordingly, the refractive index of the adhesive material 9a is smaller than the refractive index of the light guide plate 3, and most of the light hitting the surface of the adhesive material 9a is totally reflected and returns to the light guide plate 3, so that the adhesive material 9a protrudes. However, the light that enters the adhesive material 9a is reduced, so that the light emission from the protruding portion can be suppressed, and the image quality (luminance uniformity) as the lighting device can be improved. Further, since the totally reflected light propagates through the light guide plate 3 and contributes to the illumination brightness, the brightness can be improved.

  The material of the adhesive 9a of the spacing member 5 is not limited to an adhesive containing a fluorine compound, and any material having a refractive index smaller than that of the light guide plate 3 may be used. Conversely, by forming the light guide plate 3 with a material having a large refractive index, it is possible to use an acrylic or silicon adhesive that is normally used as the adhesive 9a, and to reduce the content of fluorine compounds. You can also.

  Next, a front light type liquid crystal display device according to a second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a cross-sectional view showing the structure in the vicinity of the end of the display area of the front light type liquid crystal display device according to the second embodiment.

  In the first embodiment described above, the adhesive material 9a is selected so that the refractive index of the adhesive material 9a of the spacing member 5 is smaller than the refractive index of the light guide plate 3, and light from the light guide plate 3 is applied to the adhesive material 9a. Although the light does not enter, even if light enters from the light guide plate 3, if the light is sufficiently attenuated before reaching the protruding part, generation of bright lines in the protruding part can be prevented.

  Therefore, in this embodiment, the adhesive material 9b is made light-absorbing so that light that has entered from the light guide plate 3 is absorbed efficiently. As such a light-absorbing pressure-sensitive adhesive material 9b, a material obtained by dispersing and mixing a black light-absorbing material such as carbon in a normal acrylic pressure-sensitive adhesive material or silicon-based pressure-sensitive adhesive material can be used. By using the light-absorbing pressure-sensitive adhesive material 9b, light that has entered the pressure-sensitive adhesive material 9b is absorbed by the light-absorbing material, so that even if the pressure-sensitive adhesive material 9b protrudes, generation of bright lines at the protruding portion is suppressed. Therefore, the image quality (luminance uniformity) as the lighting device can be improved.

  In the above description, the black light-absorbing material is dispersed and mixed in the acrylic or silicon adhesive material, but may be dispersed and mixed in the fluorine compound-containing adhesive material shown in the first embodiment. By adopting such a configuration, it is possible to further suppress light emission at the protruding portion of the adhesive material 9b. Further, the adhesive material 9b in which the light-absorbing material is dispersed and mixed may be provided at least on the light guide plate 3 side of the spacing member 5, but prevents the light transmitted through the adhesive material 9b from diffusing in an unintended direction. For this purpose, the light-absorbing material may be left in the pressure-sensitive adhesive 9a on the liquid crystal panel 2 side, and the light-absorbing material may be dispersed and mixed in the base material 10 of the spacing member 5 so that the pressure-sensitive adhesive 9b is used. It is good also as a structure which absorbs the transmitted light.

  The light absorbing material dispersed and mixed in the adhesive material 9b is not limited to carbon, and any light absorbing material that can be dispersed and mixed in the pressure sensitive adhesive material can be used. The colorant, pigment, and dye may be dispersed and mixed.

  As an example of using a material exhibiting a black color as an adhesive material, an invention relating to a backlight type liquid crystal display device is disclosed in Japanese Patent Laid-Open No. 7-28049. This publication is intended to solve the problem that the structure in which a light diffusing plate is provided in order to increase the brightness of the backlight increases the number of parts for laminating the light diffusing plate and the light shielding member, and the assembly work is complicated. Adhesive material is used to integrate a plurality of light diffusion sheets provided between the liquid crystal panel and the light guide plate by adhering the outer periphery, and blacking the adhesive material is ineffective display This is for shielding light incident on the region.

  On the other hand, the present invention relates to a front-light type liquid crystal display device. The reason why the adhesive 9b is made light-absorbing is not to suppress transmitted light, but is propagated through the adhesive 9b. This is for suppressing light emission at the protruding portion. Therefore, the above publication and the present invention are different in configuration, problem, purpose, and effect.

  Next, a front light type liquid crystal display device according to a third embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a plan view showing the structure of the display unit of the front light type liquid crystal display device according to the third embodiment, and FIGS. 5 and 6 show the vicinity of the end of the display area along the line BB in FIG. It is sectional drawing which shows this structure.

  In the second embodiment described above, the light-absorbing material is dispersed and mixed in the adhesive material. However, instead of making the adhesive material light-absorbing, a light-shielding member is provided in the gap holding member 5 of the light guide plate 3. It can be formed so as to cover the region facing the position, and the light that attempts to enter the adhesive material 9 can be absorbed by this light blocking member, or reflected back to the light guide plate 3.

  Specifically, as shown in FIG. 5, the light-absorbing material 11 a (for example, black ink mixed with carbon) is printed so as to cover a region of the light guide plate 3 that faces the position where the spacing member 5 is disposed, It can be set as the structure to apply | coat. With such a configuration, light can be prevented from entering the surface of the adhesive material 9 and the protruding portion of the adhesive material 9 from the light guide plate 3, and even when the adhesive material 9 protrudes, the light emission of the protruding portion is achieved. Can be prevented, and the image quality (luminance uniformity) as the lighting device can be improved.

  Moreover, as shown in FIG. 6, it can also be set as the structure which forms the reflective material 11b (for example, metal thin film) so that the area | region facing the space | interval holding member 5 arrangement | positioning position of the light-guide plate 3 may be covered. By adopting such a configuration, light that is about to enter the adhesive material 9 from the light guide plate 3 can be reflected and returned to the light guide plate 3, so that generation of bright lines at the protruding portion of the adhesive material 9 can be prevented. The light emitted from the light source 4 can be propagated to the back of the light guide plate 3, and the utilization factor of the light can be increased as in the first embodiment.

  The light-absorbing material 11a or the reflective material 11b may be provided at least in a region facing the position where the interval holding member 5 is disposed when viewed from the normal direction of the liquid crystal panel 2, but from the protruding portion of the adhesive material 9 Is also preferably formed on the display area 8 side. Further, when the light absorbing material 11a is used, there is a possibility that light transmitted through the light absorbing material 11a may enter the adhesive material 9, so that the refractive index of the adhesive material 9 is absorbed by the same idea as in the first embodiment. The absorption material 11a may be configured to reflect incident light, or a light absorbing member may be dispersed and mixed in the adhesive material as in the second embodiment to enhance absorption.

  Next, a front light type liquid crystal display device according to a fourth embodiment of the present invention will be described with reference to FIG. FIG. 7 is a cross-sectional view showing the structure near the edge of the display area of the front light type liquid crystal display device according to the fourth embodiment.

  In the first to third embodiments described above, the adhesive material itself (refractive index and inclusions) is characterized, or a light shielding member is provided between the spacing member 5 and the light guide plate 3. In addition to the light directly incident from the light source 4, the light incident on the adhesive material includes light that is reflected substantially perpendicularly to the liquid crystal panel surface by the fine unevenness provided on the viewing surface side of the light guide plate 3. In the first embodiment, a light having a large incident angle, that is, light directly incident from the light source 4 can be totally reflected by making a difference in refractive index, but a small incident angle, that is, a liquid crystal panel surface. It is impossible to totally reflect light that is incident substantially perpendicularly to the light.

  On the other hand, the fine unevenness of the light guide plate 3 is usually formed up to its end. Therefore, as shown in FIG. 7A, the light reflected by the end region of the light guide plate 3 enters the adhesive material and emits light at the protruding portion of the adhesive material.

  Therefore, in the present embodiment, in order to prevent such light that enters the liquid crystal panel surface substantially perpendicularly, the flat region 12b in which the fine unevenness is not formed in the region outside the adhesive material of the light guide plate 3. It is characterized by that. In order to form such a flat region 12b, when making a mold for injection molding, the area in which fine irregularities are engraved in the mold so that the flat region 12b is formed, or the light guide plate 3 is formed. After cutting out, the end region of the light guide plate 3 is ground and flattened, or when forming fine unevenness on the acrylic resin, the portion that becomes the flat region 12b is masked so that the fine unevenness is not formed. do it.

  In addition, even if it uses the structure of a present Example independently, the light which injects into an adhesive material can be suppressed, However, By combining with the structure of the above-mentioned 1st thru | or 3rd Example, an adhesive material is more effective. Thus, a liquid crystal display device with high display quality can be provided. Further, in FIGS. 1 and 4, the spacing member 5 and the light shielding member of the present invention are arranged over the entire circumference so as to surround the display area 8, but it is not always necessary to arrange them on the four sides. It is good also as a structure arrange | positioned only to the edge | side which tends to produce a bright line on the structure of an apparatus.

  The present invention applies the structure of the present invention to a front-light type liquid crystal display device, and the liquid crystal panel 2 may be a liquid crystal panel that drives liquid crystal by any method such as a TN method, an STN method, or an IPS method. In addition, although a TFT is generally used as the switching element, it may be applied to a liquid crystal display device using another switching element. The present invention is preferably applied to portable terminal devices such as mobile phones and PDAs, but can also be applied to devices other than those described above.

1 is a plan view showing a structure of a front light type liquid crystal display device according to a first embodiment of the present invention; 1 is a cross-sectional view illustrating a structure of a front light type liquid crystal display device according to a first embodiment of the present invention. It is sectional drawing which shows the structure of the liquid crystal display device of the front light type which concerns on 2nd Example of this invention. It is a top view which shows the structure of the liquid crystal display device of the front light type which concerns on the 3rd Example of this invention. It is sectional drawing which shows the structure of the liquid crystal display device of the front light type which concerns on the 3rd Example of this invention. It is sectional drawing which shows the structure of the liquid crystal display device of the front light type which concerns on the 3rd Example of this invention. It is sectional drawing which shows the structure of the liquid crystal display device of the front light type which concerns on the 4th Example of this invention. It is sectional drawing which shows the structure of the conventional liquid crystal display device of a front light system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case 2 Liquid crystal panel 3 Light guide plate 4 Light source 5 Spacing holding member 6 Black matrix 7 Driver IC
DESCRIPTION OF SYMBOLS 8 Display area 9 Adhesive material 9a Low refractive index adhesive material 9b Absorbent adhesive material 10 Base material 11a Light-shielding material 11b Reflective material 12a Concavity and convexity formation region 12b Flat region

Claims (2)

In the front light type liquid crystal display device in which a light guide plate having a light source is disposed on the side end portion on the viewing surface side of the liquid crystal panel,
The liquid crystal panel and the light guide plate are fixed at a predetermined interval by an interval holding member including an adhesive material on the surface of the base material in a region outside the display area,
The adhesive material of the spacing member is protruding from the base material of the spacing member,
A light-absorbing substance is contained in the base material and the adhesive material of the spacing member.   The liquid crystal display device according to claim 1, wherein the spacing member is provided substantially all around the light guide plate.

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