JP4707260B2 - Lighting unit, its manufacturing method, and liquid crystal display device using the lighting unit - Google Patents

Lighting unit, its manufacturing method, and liquid crystal display device using the lighting unit Download PDF

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Publication number
JP4707260B2
JP4707260B2 JP2001142828A JP2001142828A JP4707260B2 JP 4707260 B2 JP4707260 B2 JP 4707260B2 JP 2001142828 A JP2001142828 A JP 2001142828A JP 2001142828 A JP2001142828 A JP 2001142828A JP 4707260 B2 JP4707260 B2 JP 4707260B2
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Japan
Prior art keywords
light
sheet
guide plate
light guide
liquid crystal
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Expired - Fee Related
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JP2001142828A
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Japanese (ja)
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JP2002343126A (en
Inventor
寛 長浜
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東芝モバイルディスプレイ株式会社
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Description

[0001]
[Industrial application fields]
The present invention relates to an illumination unit in which a light source is disposed on a side surface of a light guide plate, a manufacturing method thereof, and a liquid crystal display device using the illumination unit.
[0002]
[Prior art]
In recent years, display devices for information devices such as notebook personal computers and word processors, or display devices for video devices such as portable televisions, video movies, and car navigation systems have been used for liquid crystal displays, taking advantage of their light weight, thinness, and low power consumption. Many devices have been used. Many of these liquid crystal display devices have a configuration in which illumination light is applied from behind the display element by a built-in illumination unit in order to realize a bright display screen. In this lighting unit, the edge light system in which a light guide plate is placed on the back surface of the display element and a line light source such as a fluorescent discharge tube is arranged on the end face of the light guide plate is characterized by being thin and excellent in luminance uniformity of the light emitting surface. The edge light system is often adopted as a backlight system for liquid crystal display devices used in notebook personal computers and the like. In liquid crystal display devices used in portable televisions, car navigation systems, etc., in order to achieve both thinness and brightness, an edge light method using two or more fluorescent discharge tubes, or an L-shaped fluorescent discharge tube or There are many cases where the edge light method using the U-shaped fluorescent discharge tube is adopted.
[0003]
In the edge light system, a fluorescent discharge tube is disposed outside the light guide plate, and members such as a light guide plate, a fluorescent discharge tube, and a lead wire are used to further extend the characteristics of the liquid crystal display device such as portability and space saving. The key point is how to make it compact in a housing. In addition, cost reduction by reducing the number of parts and assembly man-hours is also important in pursuit of corporate profits. In addition, products that have passed their lifespan are disposed of separately for each material in order to protect the environment. For this reason, they are required to have excellent dismantling properties.
[0004]
6 to 9 show an edge light type illumination unit UT using a conventional fluorescent discharge tube and a liquid crystal display device LD having the same. The illumination unit UT includes a flat transparent light guide plate 1 for transmitting light, an L-shaped fluorescent discharge tube 2 bent into an L shape on two of the four sides of the light guide plate 1, A reflection sheet 3 for guiding the light emitted from the fluorescent discharge tube 2 to the end face D1 of the light guide plate 1 is disposed. The light guide plate 1, the fluorescent discharge tube 2, and the like are held by a housing 9 to form an illumination unit UT. The housing 9 is provided with an opening 10 for the purpose of drawing out lead wires to the outside, reducing the weight of the housing 9, and mounting and fixing by the user. The opening 10 communicates with the outside of the lighting unit UT. A liquid crystal panel 11 and a front cover 12 are mounted on the illumination unit UT to form a liquid crystal display device LD (FIG. 6).
[0005]
The reflection sheet 3 is also disposed on the back surface of the light guide plate 1, and returns the light exiting from the back surface of the light guide plate 1 back into the light guide plate 1, thereby increasing the irradiation light exiting from the exit surface of the light guide plate 1. The role is given. Further, the reflection sheet 3 is bent along the end face D2 where the fluorescent discharge tube 2 is not disposed among the left and right D1 and D2 end faces of the light guide plate 1, thereby reflecting the light reaching the end face D2 of the light guide plate 1. In many cases, the light is returned to the light guide plate 1 to effectively use the light. Further, the reflection sheet 3 is arranged so as to surround the fluorescent discharge tube 2, and the light can be effectively used by reflecting the light emitted from the fluorescent discharge tube 2 toward the incident end face D 1 of the light guide plate 1. I am trying. Further, the bent leading end portion 3a of the reflection sheet 3 is bonded to the light guide plate 1 and the double-sided tape 7 to prevent the reflection sheet 3 from returning to the vertical due to the repulsive force caused by the bending. As the reflection sheet 3, a white resin film having a high reflectance is used. As shown in FIG. 9, the reflective sheet 3 is cut into a predetermined shape and used, and a first folded portion S1 and a second folded portion S2 are formed at predetermined locations. The folding portions S1 and S2 are perforated so as to be easily folded. In addition, on the side 3A where the L-shaped fluorescent discharge tube 2 of the reflection sheet 3 is disposed, folded portions S1 and S2 are formed at two locations, and on the side 3B where the L-shaped fluorescent discharge tube 2 is not disposed. A folded portion S is formed at one place.
[0006]
Here, as the reflection sheet 3, a part around the fluorescent discharge tube 2 (this part may be referred to as a “reflector”) and a part on the back side of the light guide plate 1 are separated from each other with a double-sided tape. However, the integrated structure shown in FIG. 6 has the advantage that the lighting unit UT can be made thinner and the cost and assembly man-hours can be reduced. In addition, there is an inner side protruding portion 9 </ b> A that protrudes toward the emission surface above the light guide plate 1 inside the outer peripheral wall of the housing 9 (see FIG. 5). Further, as the reflection sheet 3, there is also a configuration in which a portion around the fluorescent discharge tube 2 is surrounded by an arc shape, and is bonded to an exit surface portion of the light guide plate 1 via an adhesive 7 such as a double-sided tape. . The perforation is not applied to the reflection sheet 3 surrounding the fluorescent discharge tube 2 in a circular arc shape.
[0007]
The light correction sheet 4 is disposed on the exit surface D3 of the light guide plate 1. The light correction sheet 4 includes a diffusing sheet, a prism sheet, and the like. By installing an arbitrary number of sheets having various specifications as necessary, the light radiated from the light guide plate is diffused, for example, to uniformize the radiated light. And high brightness. The light correction sheet 4 is disposed only in the center of the light emitting plate D1 and the illumination unit UT of the type arranged up to the reflection sheet 3A surrounding the fluorescent discharge tube 2 and the light emission plate D1, and the reflection sheet 3A surrounding the fluorescent discharge tube 2 There is also a type of lighting unit that is not arranged (see FIG. 5).
[0008]
The light guide plate 1, the reflection sheet 3, and the light correction sheet 4 have clearances F (F 1, F 2), F 3, and F 4 around their periphery in order to absorb dimensional differences in thermal expansion due to temperature changes and dimensional errors during manufacturing. Is provided. That is, as shown in FIG. 6, clearances F (F1, F2), F3, and F4 are provided between the reflection sheet 3 and the light correction sheet 4 and the housing 9. Here, the symbol F indicates the distance (clearance) between the upper end portion of the reflection sheet 3 and the inward protruding portion 9A of the housing 9, and the upper side light correction sheet 4A and the inward side of the housing 9 An interval (clearance) between the protruding portion 9A is indicated as F1, and a space between the lower light correction sheet 4A and the upper end portion of the reflecting sheet 3 is indicated as F2. Reference numerals G, G1, and G2 indicate dust entry paths, reference numeral G1 indicates the dust entry path to the interval F1, and reference numeral G2 indicates the dust entry path to the interval F2.
[0009]
On the other hand, in the manufacturing method for assembling the conventional lighting unit UT having the above-described configuration, a step of bonding the bent leading end portion 3a on the upper end side of the reflection sheet 3 via the light guide plate 1 and an adhesive 7 such as a double-sided tape is necessary. It was. Further, the intrusion of dust generated when the lighting unit UT and the liquid crystal display device LD are assembled has been an important problem.
[0010]
[Problems to be solved by the invention]
By the way, in the conventional illumination unit UT and liquid crystal display device LD having the above-described configuration, the dust inside and outside the housing 9 and the dust generated during the assembly of the illumination unit UT and the liquid crystal display device LD are caused by the liquid crystal panel 11 and the light correction sheet. How to prevent entry into the display area side where 4 is arranged is a big problem (see symbols G, G1, G2 in FIG. 6). That is, in order to absorb a dimensional difference of thermal expansion due to a temperature change of the light guide plate 1, the light correction sheet 4, and the reflection sheet 3 and a dimensional error at the time of manufacture, a gap F between these and the housing 9 is obtained. (F1, F2), F3, and F4 are provided. However, dust from the inside or outside of the housing 9 or dust generated during assembly of the liquid crystal display device LD or the like is separated by the distances F (F1, F2), There is a risk of entering the display area via F3 and F4. In addition, an opening 10 is provided on the side of the housing 9, and the opening 10 communicates with the interval F. Therefore, dust that has entered from the opening 10 enters the display area. .
[0011]
When dust enters the display area side, the output light is blocked, causing brightness unevenness, and the members on the display area side such as the light correction sheet 4 are damaged due to friction between the dust and the light correction sheet 4. appear. And once dust enters between the liquid crystal panel 11 and the lighting unit UT, it is very difficult to remove without disassembling. It is not effective unless dust is prevented from entering not only from the side where the fluorescent discharge tube 2 is disposed but also from the side where the fluorescent discharge tube 2 is not disposed.
[0012]
Further, when the user unexpectedly presses the surface of the liquid crystal panel 11 or drops the liquid crystal display device LD, there is an obstacle that the liquid crystal panel 11 made of glass is broken.
[0013]
Furthermore, in the conventional lighting unit UT having the above-described configuration, it is necessary to bond the tip 3a on the upper end side of the reflection sheet 3 to the light exit surface of the light guide plate 1 with an adhesive 7 such as a double-sided tape. The evil caused by. That is, since the adhesive 7 is different from the one refractive index of the light guide plate, the portion where the adhesive 7 is disposed has a higher luminance than the other portions, causing a problem of uneven brightness. Furthermore, since it is necessary to arrange | position so that the edge part of the upper end side of the reflective sheet 3 may be pinched | interposed between the light correction sheet | seat 4 and the light-guide plate 1, it is for the thickness of the reflective sheet 3 and the adhesive agent 7 (code | symbol F5). ), The lighting unit UT was thick.
[0014]
In order to solve such a problem, a method of installing a member for preventing dust intrusion as a separate member in the dust intrusion path is conceivable. However, in order to achieve a lighter and smaller size of the illumination unit UT and the liquid crystal display device LD, the size and weight from the light guide plate 1 to the outer shape of the liquid crystal display device LD are limited, and another is to prevent dust from entering. A member is not provided around the light guide plate 1.
[0015]
On the other hand, in the manufacturing method for assembling the conventional lighting unit UT having the above-described configuration, a step of bonding the bent leading end portion 3a on the upper end side of the reflection sheet 3 via the light guide plate 1 and an adhesive 7 such as a double-sided tape is necessary. It was. Further, the intrusion of dust generated when the lighting unit UT and the liquid crystal display device LD are assembled has been an important problem.
[0016]
Accordingly, a first object of the present invention is to prevent the intrusion of dust into the display area side by using the members constituting the illumination unit and the liquid crystal display device as they are and to break the liquid crystal panel due to an unexpected external force. It is another object of the present invention to provide an illumination unit that prevents the harmful effects caused by adhesives such as double-sided tape and a liquid crystal display device using the illumination unit. In addition, the second object of the present invention is to reduce the process of adhering the upper side of the reflection sheet with an adhesive such as a double-sided tape, and to reliably prevent dust from entering the display area by a simple process. It is to provide a method for manufacturing a unit.
[0017]
The illumination unit according to claim 1 of the present invention includes a light source, a light guide plate that guides light from the light source, a reflection sheet that has an opening at an incident end surface of the light guide plate and is disposed so as to surround the light source, and a light guide. The light correction sheet disposed on the light exit surface of the optical plate and a housing for holding these members are provided, and the reflection sheet is bent at the upper end side on the side surrounding the light source, and the bending tip portion has a repulsive force due to the bending. The light correction sheet is configured to be in contact with the back surface of the light correction sheet, and the bent front end portion is configured to overlap the light exit surface of the light guide plate. It is located outside the outer periphery of the polarizing plate disposed on the exit surface side.
[0018]
According to the present invention, the bent leading end portion of the reflection sheet is configured to be in contact with the back surface of the light correction sheet using the repulsive force of the bending, and the bent leading end portion is superimposed on the light exiting surface of the light guide plate. Therefore, without providing a separate member, it is possible to prevent the intrusion of dust from the portion that communicates with the interval between the exit surface of the light guide plate and the light correction sheet and the interval to the display region side, and There is no need to use an adhesive such as a double-sided tape on the exit surface of the light guide plate. In addition, since the bent leading end portion of the reflection sheet is configured to overlap the light exit surface of the light guide plate, it is cushioning for a display device such as a liquid crystal panel disposed on the irradiation surface side of the illumination unit. Due to the function, the liquid crystal panel is broken, and the display device is protected from an unexpected external pressure or the like.
[0020]
Also, According to the present invention, the bent leading end portion of the reflection sheet is located at a position where it does not interfere with the polarizing plate, so that it overlaps the exit side surface of the light guide plate of the reflection sheet. Ru The influence by the portion does not occur in the polarizing plate.
[0021]
Claims of the invention 2 The lighting unit described is based on the invention of claim 1, wherein the casing has conductivity, and light source It is characterized by having conductivity on the opposite surface.
[0022]
According to this invention, light source It is possible to provide a shielding effect that prevents noise from entering an electronic component such as a liquid crystal panel due to the influence of electromagnetic waves emitted from the liquid crystal panel.
[0023]
Claims of the invention 3 In the manufacturing method of the illumination unit described above, a reflection sheet having a predetermined shape in which a portion surrounding the light source is formed is disposed in the housing together with the light source, and a light guide plate that guides light from the light source is disposed on the irradiation surface side of the reflection sheet. In the manufacturing method of the illumination unit in which the light correction sheet is arranged on the light exit surface of the light guide plate, the upper end side of the reflective sheet surrounding the light source is the light exit surface of the light guide plate. To overlap The light correction sheet is arranged in a folded state, and the bending tip of the reflection sheet is configured to contact the back surface of the light correction sheet using the repulsive force of the bending, The bent front end portion of the reflection sheet is positioned outside the outer periphery of the polarizing plate disposed on the light exit surface side of the light correction sheet. It is characterized by comprising as follows.
[0024]
According to the present invention, when the light correction sheet is disposed on the light exit surface above the light guide plate after the upper end side of the reflection sheet is bent, the bent leading end portion of the reflection sheet is in contact with the back surface of the light correction sheet by the repulsive force. Thus, a separate process for processing so as to be in contact with the back surface of the light correction sheet is unnecessary, and dust can be prevented from entering by a simple process. Moreover, the process of apply | coating adhesives, such as a double-sided tape, to the output surface of a light-guide plate like the past, and adhere | attaching the bending front-end | tip part of a reflective sheet and a light-guide plate becomes unnecessary. Further, when the liquid crystal panel is mounted on the lighting unit according to the present invention, since the load of the liquid crystal panel presses the light correction sheet and the bent leading end portion of the reflection sheet against the repulsive force of the reflection sheet, the reflection sheet is predetermined. It is adjusted to the bent state. Therefore, a step for adjusting the bent state of the reflection sheet is not required in the reflection sheet bending step.
[0025]
Claims of the invention 4 The liquid crystal display device according to claim 1. Or claim 2 And a liquid crystal panel arranged on the irradiation surface side of the illumination unit.
[0026]
According to the present invention, dust can be prevented from entering the display area side from the side where the light source is not disposed between the light correction sheet and the light guide plate by a simple process without providing a separate member, and the liquid crystal Since it can contribute to the thinning of the panel, a liquid crystal display device using an inexpensive, thin and highly reliable lighting unit is obtained. The liquid crystal panel to be used is mounted with a gap of 0.4 mm or less than the pixel size of the liquid crystal panel to be used.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0028]
In the present embodiment, as shown in FIGS. 1 to 3, a light source 2, a light guide plate 1 on a flat plate that transmits light from the light source 2, and a reflection sheet arranged along the back surface of the light guide plate 1. 3, a light correction sheet 4 disposed on the exit surface of the light guide plate 1, and a housing 9 disposed with a space so as to surround the reflection sheet 3. In the light source 2, a fluorescent discharge tube 2 that is driven by high-frequency alternating current (for example, 40 to 100 kHz) to emit light is arranged in an L shape on two sides of the light guide plate 1 (“L shape”). Called "fluorescent discharge tubes").
[0029]
The housing 9 holds the light guide plate 1, the reflection sheet 3, the fluorescent discharge tube 2 and the like from the left and right directions, and also holds the liquid crystal panel 11 at the same time. There are various types of housings 9 such as those that hold the light guide plate 1 and the like from above and below, and those that are formed in a box shape from a resin molding material. The housing 9 is made of a metal such as a sheet metal, and together with a conductive member such as a metal foil attached to the back surface of the reflection sheet 3, an electronic component such as a liquid crystal panel 11 due to the influence of electromagnetic waves emitted from the fluorescent discharge tube 2. It has a shielding effect that prevents noise from entering. And the light guide plate 1, the fluorescent discharge tube 2, etc. are hold | maintained at the said housing | casing 9, and the illumination unit UT is comprised. Then, a liquid crystal panel 11 is mounted on the illumination unit UT, and a front cover 12 is attached thereon to constitute a liquid crystal display device LD. The front cover 12 is also a kind of housing. Reference numerals 11a and 11b in the drawing denote a pair of substrates of the liquid crystal panel 11. A color filter is provided on the inner surface side of the upper substrate 11a, and a liquid crystal driving pattern is provided on the inner surface side of the lower substrate 11b.
[0030]
The light guide plate 1 is made of a material such as acrylic having optimal optical characteristics represented by transmittance and refractive index necessary for light transmission. The light guide plate 1 is provided with a dot pattern or a groove pattern (not shown) whose shape is changed according to the distance from the fluorescent discharge tube 2 on the back surface. The light emitted from the fluorescent discharge tube 2 is collected on the incident side end face D1 of the light guide plate 1 and guided to the inside.
[0031]
The reflection sheet 3 is made of a white resin film having a high reflectance, and is formed by being bent from the back surface of the reflection sheet 3. The light emitted from the fluorescent discharge tube 2 is efficiently guided to the incident end face D1 of the light guide plate 1 by being bent so as to surround the fluorescent discharge tube 2. The reflection sheet 3 is bent from the first folded portion S1 at one side surrounding the fluorescent discharge tube 2. The folded upper end side is bent, and the bent leading end portion 3a is configured to come into contact with the back surface 4a of the light correction sheet 4 using the repulsive force generated by the bending. In addition, if the thickness of the reflective sheet 3 is a thickness with which repulsive force is exhibited, it is arbitrary according to the material etc.
[0032]
On the other hand, the side 3B where the reflection sheet 3 fluorescent discharge tube 2 is not arranged is bent along the light guide plate end face D2. By being bent along the light guide end surface D2, the light exiting from the end surface D2 of the light guide plate 1 is returned again into the light guide plate 1, and the light emitted from the surface of the light guide plate 1 is increased. Yes. The reflection sheet 3 on the back surface of the light guide plate 1 has a role of increasing illumination light that is emitted back from the back surface of the light guide plate 1 back into the light guide plate 1. As a kind of the reflection sheet 3, there is one in which a portion around the fluorescent discharge tube 2 (this portion may be referred to as a reflector) and a portion on the back side of the light guide plate 1 are separated in addition to the one having the above-described integrated configuration. However, the present invention is also applicable to such a reflective sheet 3.
[0033]
As shown in FIG. 4, the reflection sheet 3 is perforated only in the first folded portion S1, but the second folded portion S2 is not perforated. ing. Here, the second folded portion S2 may also be perforated, but in order to make the repulsive force of the folded leading end portion 3a of the reflective sheet 3 easy to be exhibited, the second folded portion S2 includes It is preferable that the perforation is not applied. However, as long as it does not affect the repulsive force, it is optional depending on the implementation to perforate at a predetermined interval. Note that the side 3B of the reflection sheet 3 where the fluorescent discharge tube 2 is not disposed is slightly shorter than the side 3A where the fluorescent discharge tube 2 is disposed.
[0034]
The upper end side of the reflection sheet 3 is folded back, and the bent leading end portion 3a is configured to come into contact with the back surface 4a of the light correction sheet 4 using the repulsive force generated by the bending. As a result, the bent tip 3a and the light correction sheet 4 are brought into close contact with each other, so that the distance H1 provided between the light correction sheet 4 and the light guide plate 1 is shifted from the side where the fluorescent discharge tube 2 is arranged to the display region side. Intrusion of dust is prevented. The reflection sheet 3 is in contact with the back surface 4a of the light correction sheet 4 using the repulsive force of the reflection sheet 3 itself, and is arranged on the light guide plate 1 without being bonded with a double-sided tape or the like. Therefore, it is not necessary to use an adhesive such as a double-sided tape on the light exit surface D3 of the light guide plate, thereby preventing luminance unevenness caused by the adhesive such as a double-sided tape.
[0035]
The bent leading end 3a on the upper end side of the reflection sheet 3 is arranged to reach the light exiting surface D3 side of the light guide plate 1 while exhibiting the repulsive force and to contact the light correction sheet 4, and the bent leading end 3a is guided. The optical plate 1 is configured to be overlapped on the exit surface D3 side. As a result, the liquid crystal panel 11 is broken or the liquid crystal display device LD is protected from an unexpected external pressure or the like by a cushioning action on the display device such as the liquid crystal panel 11 arranged on the irradiation surface side of the illumination unit UT. In addition to preventing dust from entering the H1 between the light correction sheet 4 and the light guide plate 1 from the side where the fluorescent discharge tube 2 is not disposed, the illumination unit UT and the liquid crystal display device LD are thin. It also contributes to the transformation.
[0036]
Here, as another example of the present embodiment, as shown by the alternate long and short dash line in FIG. 2, the reflection sheet 3 may be configured not to overlap the light guide plate 1 but to the incident side end surface of the light guide plate. Since the thickness F of the light guide plate 1 is smaller than the thickness of the light guide plate 1 depending on the thickness of the reflection sheet 3, the incident light amount is relatively reduced, and the brightness is insufficient.
[0037]
Further, as shown in the conventional example, the light guide plate 1, the light correction sheet 4, and the reflection sheet 3 have a distance F (around each periphery in order to absorb a dimensional difference in thermal expansion due to a temperature change and a dimensional error during manufacturing. F1, F2), F3, F4 are provided. That is, as described above, the intervals F (F1, F2) and F3, 4F are provided between the reflection sheet 3 and the light correction sheet 4 and the housing 9. The housing 9 is provided with an opening 10 for the purpose of drawing out the lead wires to the outside, reducing the weight of the housing, and mounting and fixing by the user, and the intervals F (F1, F2), F3. , F4 communicates with the outside of the illumination unit UT through the opening 10.
[0038]
The light correction sheet 4 (4A, 4B) is disposed on the exit surface D3 of the light guide plate 1. The light correction sheet 4 is for equalizing and increasing the brightness of the light emitted from the illumination unit UT. In the present embodiment, one diffusion sheet 4A and one prism sheet 4B are used. Yes. The diffusion sheet 4A is a sheet-like optical member used for diffusing the light from the fluorescent discharge tube 2 and irradiating the liquid crystal panel 11 uniformly. The prism sheet 4A is a transparent resin film, and is triangular. It has a structure in which regular grooves of the shape are cut. The light correction sheet 4 is not limited to the diffusion sheet 4A and the prism sheet 4B, and any number of sheets having various specifications may be installed as necessary. However, the present invention is applicable without being limited to the specifications and the number. Further, a step portion 4 c is formed on one of the left and right sides (left side in the drawing) of the light correction sheet 4. This is because the bent leading end portion 3 a of the reflection sheet 3 is overlapped with the emission surface D 3 of the light guide plate 1. The light correction sheet 4 is usually not simply bonded to any of the reflection sheet 3, the housing 9, and the light guide plate 1, but is simply stacked. Some are bonded to prevent the sheet 4 from being displaced. In either case, the effects of the present invention are not affected. In addition, there is a type of illumination unit in which the light correction sheet 4 is arranged only at the center of the emission surface D3 of the light guide plate 1 and is not arranged up to the reflection sheet 3A surrounding the fluorescent discharge tube 2 (see FIG. 5).
[0039]
A display back side polarizing plate (polarizing plate) 13 is disposed above the light correction sheet 4. This display back surface side polarizing plate 13 is disposed on the inner side (center side) that does not overlap with the bent front end portion 3 a that is bent until the outer periphery 13 a overlaps the emission side surface D 3 of the light guide plate 1 of the reflection sheet 3. Since the bending dimension of the reflection sheet 3 overlaps with the emission side surface D3 of the light guide plate 1, it is important that the reflection sheet 3 is a dimension that does not interfere with the display back side polarizing plate 13 to be installed thereon. The bent front end portion 3 a of the reflection sheet 3 is outside the display back surface side polarizing plate 13 so as not to overlap with the outer periphery 13 a of the display back surface side polarizing plate 13. That is, the light guide sheet 1 is disposed closer to the center of the light guide plate 1 than the step portion 4 c of the light correction sheet 4, that is, one side (left end portion 13 a) of the polarizing plate 13 is aligned with the step portion 4 c of the light correction sheet 4. . Therefore, a step 4c is generated in the light correction sheet 4 by the thickness of the reflection sheet 3 on the light guide plate exit surface D3 and the upper surface of the reflection sheet 3. The overlapping portion of the reflection sheet 3 Since the dimensions do not interfere, the step can be absorbed by the display back side polarizing plate 13.
[0040]
The present embodiment is configured as described above, and uses the repulsive force of the reflection sheet 3 to start from the interval H1 between the exit surface D3 of the light guide plate 1 and the light correction sheet 4 and the portion F3 that communicates with the interval. It is possible to prevent dust from entering the display area. In particular, there is a high possibility that dust will invade from the vicinity of the opening 10 of the housing in which dust enters from the outside. However, according to the present embodiment, the opening 10 of the housing is the fluorescent discharge tube 2. , The gap F3 leading from the opening 10 of the housing to the display area side can be closed, dust can be prevented from entering the display area side, and the bent tip 3a of the reflective sheet 3 can be prevented. Is superimposed on the light exit surface D3 side of the light guide plate 1, so that the liquid crystal panel 11 is prevented from being broken due to an unexpected external pressure or the like. Moreover, since the reflective sheet 3 does not require the use of an adhesive such as a double-sided tape, problems such as luminance unevenness caused by the adhesive can be solved. Furthermore, since the space | interval for pinching the bending front-end | tip part 3a and the adhesive agent of the upper end side of the reflection sheet 3 between the light correction sheet 4 and the light-guide plate 1 becomes unnecessary, the light-correction sheet 4 and the light-guide plate 1 and The illumination unit UT and the liquid crystal display device LD can be thinned by reducing or eliminating the interval H1 between the fluorescent discharge tube 2 and the interval H1 between the correction sheet 4 and the light guide plate 1. It is also possible to make it difficult for dust entering from the side where no dust is disposed, and depending on the size of the dust, entry of the dust can be prevented.
[0041]
Further, since the light correction sheet 4 of the present invention is a resin film and is easily bent, the end of the light correction sheet 4 is pushed up to the liquid crystal panel 11 side by the repulsive force of the reflection sheet 3 and is in close contact with the liquid crystal panel 11. Yes. Therefore, dust entering from the gap G2 can be prevented.
[0042]
In the present invention, the front end portion 3a of the reflection sheet 3 has been described so as to contact the light correction sheet 4A. However, when the light correction sheet 4A is reduced in size and configured to contact the light correction sheet 4B, both Similar actions and effects can be obtained when the size of the light correction sheet 4 (4A, 4B) is reduced so as to be in direct contact with the liquid crystal panel 13.
[0043]
In the illumination unit UT having the above configuration, the fluorescent discharge tube 2, the light guide plate 1 and the like are held in the housing 9, and the liquid crystal panel 11 is arranged on the irradiation surface side of the illumination unit UT to assemble the liquid crystal display device LD.
[0044]
(Manufacturing method of the first embodiment)
Next, when assembling the illumination unit UT of the first embodiment, a reflecting sheet 3 having a predetermined shape in which a portion surrounding the fluorescent discharge tube 2 is formed in the housing 9 is arranged together with the fluorescent discharge tube 2. Next, after the light guide plate 1 and the fluorescent discharge tube 2 are installed at predetermined positions on the reflection sheet 3, the upper end side of the reflection sheet 3 is bent, and in this bent state, the light correction sheet 4 (4A, 4B) Arrange. In this case, the light correction sheet 4 has a size that allows the left and right ends of the light correction sheet 4 to reach the bent front end 3 a of the reflection sheet 3.
[0045]
When the upper end portion of the reflection sheet 3 is bent, a force for returning to the original vertical shape is exerted by the repulsive force of the reflection sheet 3. Since the repulsive force of the reflection sheet 3 always works in the direction in which the light correction sheet 4 is pressed, by using this force, the light correction sheet 4 is disposed in a state where the reflection sheet 3 is not bonded to any of the reflection sheets 3. The bent leading end portion 3a of the sheet 3 comes into close contact with the back surface 4a of the light correction sheet 4 by pressing. Therefore, prevention of dust intrusion can be realized by a simple process. Conventionally, a process of adhering the reflective sheet 3 to the light guide plate 1 with an adhesive 7 such as a double-sided tape 7 is required. However, this process is not necessary in the present embodiment, and thus this adhesive process can be reduced. At the time of disposal of this product, it is necessary to separate and dispose of it according to the material to cope with the recent environment. However, since the fixing by the double-sided tape 7 used in the conventional example is eliminated, the dismantling property is superior to the conventional one.
[0046]
The liquid crystal panel 11 is mounted on the lighting unit UT assembled by the manufacturing method. When the liquid crystal panel 11 is arranged, the liquid crystal panel 11 pushes down the light correction sheet 4 against the repulsive force of the reflection sheet 3 due to the load, and the bent front end portion 3 a of the reflection sheet 3 is arranged on the emission surface D 3 of the light guide plate 1. . That is, the bent state of the reflection sheet is naturally adjusted by the load of the liquid crystal panel 11. At that time, when the reflection sheet 3 surrounding the fluorescent discharge tube 2 is bent so as to overlap the light emission side surface D3 of the light guide plate 1, it should not interfere with the display back side polarizing plate 13 to be placed thereon. is important. That is, since the area of the emitted light limited by the bending of the reflection sheet 3 is larger than the display back side polarizing plate 13, the thickness of the reflection sheet 3 is equal to the light guide plate emission surface D 3 and the upper surface of the reflection sheet 3. A step 4c is generated in the light correction sheet 4, but the overlapping portion of the reflection sheet 3 is dimensioned so as not to interfere with the display back side polarizing plate 13, so that the step 4c is absorbed by the display back side polarizing plate 13. Is possible. And the process of adjusting the reflective sheet 3 becomes unnecessary at the time of manufacture of the illumination unit UT, and the illumination unit UT of this invention can be manufactured by a simple process. Finally, the front cover 12 is attached to complete the liquid crystal display device LD.
[0047]
In the present invention, the reflection sheet 3a has been described as being in contact with the light correction sheet 4A. However, when the size of the light correction sheet 4 is reduced to be in contact with the light correction sheet 4B, or in the same manner, A similar effect can also be obtained when configured to be in contact with the panel 11.
[0048]
In the present invention, the bent state of the reflection sheet 3 is adjusted by the load of the liquid crystal panel 11. However, when the housing 9 is disposed between the light correction sheet 4 and the liquid crystal panel 11, the housing 9 The same effect can be obtained depending on the shape.
[0049]
(Second Embodiment)
As shown in FIG. 5, the lighting unit according to the present embodiment has an inward protruding portion 9 </ b> A that partially protrudes from the light emitting plate 1 on the light exit surface of the housing 9. 9 A of side protrusion parts are provided so that the height position of the back surface 9a may turn into the height position of the output surface of the light-guide plate 1. As shown in FIG. Further, the light correction sheet 4 (4A, 4B) is arranged at the center of the emission surface of the light guide plate 1, and includes the position of the reflection sheet 3A surrounding the fluorescent discharge tube 2 and the reflection sheet 3B on the side where the fluorescent discharge tube 2 is not provided. Not arranged. Therefore, in this type of lighting unit UT, as in the first embodiment, the bent leading end portion 3a of the reflection sheet 3 is brought into contact with the back surface 4a of the light correction sheet 4 using the repulsive force of the bending. Cannot be configured.
[0050]
Therefore, the bent leading end portion 3a of the reflection sheet 3 is configured to contact the back surface 9a of the inwardly protruding portion 9A of the housing 9 by using a repulsive force due to the bending. That is, the bent front end portion 3 a of the reflection sheet 3 reaches the emission surface D 3 of the light guide plate 1 and is superimposed on the emission surface D 3, and is in contact with the back surface 9 a of the inward protruding portion 9 A of the housing 9. Is done. Therefore, the same effects as those of the first embodiment can be obtained.
[0051]
In addition, since the reflection sheet 3 of the present embodiment is configured to be in contact with the back surface 9a of the inwardly protruding portion 9A of the housing 9 and configured to overlap the emission surface D3 of the light guide plate 1, Intrusion of dust into the interval H1 between the exit surface D3 of the light guide plate 1 and the light correction sheet 4 and the portion F3 leading to the interval is prevented, and there is no problem of uneven brightness due to the conventional double-sided tape. In addition, the configuration in which the bent front end portion 3a of the reflection sheet 3 is in contact with the back surface 9a of the inward protruding portion 9A of the housing 9 is that the light correction sheet 4 is arranged at the center of the light exit surface D3 of the light guide plate 1. Even in an illumination unit of a type that is not arranged up to the reflection sheet 3 that surrounds the fluorescent discharge tube 2, the distance between the exit surface D3 of the light guide plate 1 and the light correction sheet 4 and the portion F3 that communicates with the distance to the display region side. Intrusion of dust can be prevented.
[0052]
When the liquid crystal panel 11 is disposed above the illumination unit UT having the above configuration, dust from inside or outside the housing 9 enters the display region side at an interval on the display region side where the liquid crystal panel 11 is disposed. Therefore, the liquid crystal display device LD using a thin, inexpensive, and reliable lighting unit is obtained.
[0053]
(Manufacturing method of the second embodiment)
In assembling the lighting unit of the present embodiment, the upper end side of the side 3A surrounding the fluorescent discharge tube 2 of the reflection sheet 3 is bent, and then the fluorescent discharge tube 2 is mounted on the housing 9 having the inward protruding portion 9A. By disposing the reflective sheet 3 having a predetermined shape with the fluorescent discharge tube 2 so as to form an enclosing portion, the repulsive force caused by the bending of the bent tip portion 3a is used to contact the back surface of the inwardly protruding portion 9A of the housing 9. In addition, the bent distal end portion 3a is configured to overlap the light exit surface D3 of the light guide plate 1. Thereafter, the light guide plate 1 is disposed on the exit surface side of the reflection sheet 3 and the light correction sheet 4 is disposed on the exit surface D3 of the light guide plate 1 as in the case of the first embodiment. In this case, the inner-side protruding portion 9 a of the housing 9 is arranged so that the end thereof reaches the bent front end portion 3 a of the reflection sheet 3.
[0054]
When the upper end portion of the reflection sheet 3 is bent, a force for returning to the original vertical shape is exerted by the repulsive force of the reflection sheet 3. Since the repulsive force of the reflecting sheet 3 always works in the direction in which the inner side protruding portion 9a of the housing 10 is pressed, the light correcting sheet 4 can be used in a state where the reflecting sheet 3 is not adhered to any of the forces. By disposing, the bent leading end portion 3a of the reflection sheet 3 comes into close contact with the back surface 4a of the light correction sheet 4 by pressing. Therefore, a separate process for processing so as to be in contact with the back surface of the inward protruding portion of the housing 9 is not necessary, and dust can be prevented from entering by a simple process. Further, conventionally, a process of adhering the reflective sheet 3 to the light guide plate 1 with an adhesive 7 such as a double-sided tape is required. However, since this process is not required in the present embodiment, this adhering process can be reduced. Further, since the shape of the casing 9 is constant, even when the opening width 3h of the reflecting sheet 3 is equal to or larger than the opening width 9h of the casing 9 due to the repulsive force, the reflecting sheet 3 is disposed on the casing 9. 2, the reflection sheet 4 is pushed down against the repulsive force of the reflection sheet 3, and the reflection sheet 3 is arranged inside the housing 9. Therefore, when the repulsive force is not used, the bent state of the reflecting sheet 3 must be adjusted in order to configure the bent leading end portion 3a of the reflecting sheet 3 to be in contact with the inner piece side protruding portion 9a of the housing 9. According to the present invention, since the reflection sheet 3 is arranged in the housing 9 and is naturally adjusted according to the shape of the housing 9, there is no need for adjustment in the folding process, and dust entry prevention can be performed with a simple process. Can be realized.
[0055]
【Example】
By the way, in 1st and 2nd embodiment, as shown in FIG. 2, it is made for the reflective sheet 3 to extend to the output surface D3 of the light-guide plate 1, and adhesives, such as a double-sided tape, are used. Intrusion of dust is prevented by narrowing or eliminating the interval H1 between the light correction sheet 4 and the light guide plate 1 by eliminating the effect, but this is an effect exhibited only at the interval H1. In the embodiment, the light correction sheet 4 is in close contact with the liquid crystal panel 11 to prevent dust from entering through the gap G2, but this effect is obtained when the light correction sheet 4 is difficult to bend. I can't. Therefore, by reducing not only the distance H1, but also the distance H2 between the light correction sheet 4 and the liquid crystal panel 11, it is possible to effectively prevent a decrease in display accuracy caused by dust. Accordingly, the present inventors conducted the following experiment in order to make the above-mentioned constant interval H2 a dimension effective for preventing intrusion of dust that affects display accuracy.
[0056]
Example 1
A transmissive liquid crystal panel 11 or a reflective liquid crystal panel 11 was mounted between the light correction sheet 4 and the liquid crystal panel 11 with an interval H2 of 0.4 mm or pixel size. As a result, dust larger than the above size did not enter, and the display on the liquid crystal panel 11 was not affected. This is because, from the relationship with the pixel size in the present invention, if dust of the size or less enters, the pixel is not concealed during screen display, and display failure does not occur. In addition, by mounting the liquid crystal panel 11 at the above-described interval, even when the user presses the panel display surface due to an unexpected accident, the bent front end portion 3a of the reflective sheet 3 is superimposed on the light exit surface D3 of the light guide plate 1. Since it is comprised, the said bending | flexion front-end | tip part 3a can act as a cushion, and the situation where the liquid crystal panel 11 normally comprised with glass can also be prevented.
[0057]
(Comparative Example 1)
A transmissive liquid crystal panel 11 or a reflective liquid crystal panel 11 was mounted between the light correction sheet 4 and the liquid crystal panel 11 with an interval H2 exceeding 0.5 mm or a pixel size. As a result, dust of the above size entered and affected the display on the liquid crystal panel 11. This is because, from the relationship with the pixel size in the present invention, when dust of the size or more enters, the pixel is hidden during screen display, resulting in a display defect.
[0058]
As is clear from each of the above embodiments, by mounting the liquid crystal panel 11 to be used at an interval of 0.4 mm or less or less than the pixel size of the liquid crystal panel 11 to be used, in the illumination unit UT and the liquid crystal display device LD, Intrusion of dust that affects the display of the liquid crystal panel 11 can be reliably prevented. Therefore, the space H2 between the light correction sheet 4 and the liquid crystal panel 11 is manufactured as described above in the first embodiment. As a result, it was possible to prevent dust having a size that would affect at least the liquid crystal display at the interval H2 from entering the display area, and to effectively prevent a decrease in display accuracy caused by the dust. .
[0059]
As described above, in each of the above embodiments, the case where the present invention is applied to the illumination unit UT using the L-shaped fluorescent discharge tube 2 has been described. However, the present invention is not limited to the L-shape, and various illumination units may be used. Can also be widely applied. In each of the above embodiments, the description has been mainly made on the side 3A of the reflection sheet 3 on which the light source 2 is disposed. However, the present invention adopts the same configuration on the side 3B of the reflection sheet 3 on which the light source 2 is not disposed. Can also be applied. Furthermore, although the reflection sheet 3 has been described as having the first folded portion S1, the present invention can also be applied to an illumination unit that surrounds a portion around the light source 2 in an arc shape.
[0060]
【The invention's effect】
According to the illumination unit and the liquid crystal display device of the present invention, the bent front end portion of the reflection sheet is configured to contact the back surface of the light correction sheet or the back surface of the inward protruding portion of the housing using the repulsive force of the bending. In addition, since the bent tip portion is configured to overlap the light exit surface of the light guide plate, the distance between the light exit surface of the light guide plate and the light correction sheet, or the inward protruding portion of the reflective sheet and the housing It is possible to prevent the intrusion of dust into the gaps and the parts leading to these gaps. In addition, since it is not necessary to use an adhesive such as a double-sided tape on the light exiting surface of the light guide plate, the distance between the spectral correction sheet and the light guide plate can be narrowed, and the problem of uneven brightness due to the conventional double-sided tape also occurs. It can be solved. In addition, since the bent leading end portion of the reflection sheet is configured to overlap the light exit surface of the light guide plate, it is cushioning for a display device such as a liquid crystal panel disposed on the irradiation surface side of the illumination unit. By the function, the liquid crystal panel can be broken and the display device can be protected from an unexpected external pressure or the like.
[0061]
According to the manufacturing method of the lighting unit of the present invention, the bent leading end portion of the reflection sheet is configured to contact the back surface of the light correction sheet and the back surface of the inward protruding portion of the housing using the repulsive force of the bending. In addition, since the bent tip portion is configured to overlap the light exit surface of the light guide plate, dust can enter the space between the light exit surface of the light guide plate and the light correction sheet and the portion that leads to the space in a simple process. In addition, it can prevent the liquid crystal panel from cracking and protecting the display device from unexpected external pressure, etc. It becomes possible to do. Further, since it is not necessary to use an adhesive such as a double-sided tape on the light exit surface of the light guide plate, it is not necessary to use this bonding step, and uneven brightness due to the adhesive can be prevented. Therefore, a thin lighting unit with high display accuracy can be manufactured by a simple manufacturing method.
[0062]
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a configuration of a lighting unit according to a first embodiment of the present invention.
FIG. 2 is an enlarged sectional view of the first embodiment.
FIG. 3 is a plan view showing the lighting unit according to the first embodiment.
FIG. 4 is an enlarged plan view showing the reflection sheet of the first embodiment.
FIG. 5 is a cross-sectional view showing a configuration of a lighting unit according to a second embodiment of the present invention.
FIG. 6 is a cross-sectional view showing a configuration of a conventional lighting unit
FIG. 7 is a plan view showing a configuration of a conventional lighting unit.
FIG. 8 is a side view of a conventional lighting unit.
FIG. 9 is a plan view showing the conventional reflective sheet in an expanded state.
[Explanation of symbols]
1 Light guide plate
2 Fluorescent discharge tube (light source)
3,3A, 3B Reflective sheet
3a Bending tip of reflective sheet
4,4A, 4B Light correction sheet
4a Back side of light correction sheet
4c Stepped part
9A, 9B Inner side protruding part of housing
9a Back side of inward protruding part
10 Opening of housing
11 LCD panel
11a, 11b substrate
13 Display back side polarizing plate (polarizing plate)
D1 Incident end face of light guide plate
D3 Output surface of light guide plate
G, G1, G2 Dust entry path
H1 Distance between the correction sheet and the light guide plate
Spacing on the irradiation surface of the H2 lighting unit
S, S1, S2 Reflection sheet folding part
F, F1, F2, F3, F4 Peripheral spacing (clearance) of reflective sheet, etc.
F3 A part that leads to the surrounding space, such as a reflective sheet
UT lighting unit
LD liquid crystal display

Claims (4)

  1. A light source, a light guide plate that guides light from the light source, a reflection sheet that has an opening at an incident end surface of the light guide plate and is disposed so as to surround the light source, and a light correction sheet that is disposed on an output surface of the light guide plate The reflection sheet is provided with a housing for holding these members, and the reflection sheet is bent at the upper end side that surrounds the light source, and the bent leading end portion is in contact with the back surface of the light correction sheet by utilizing the repulsive force of the bending. And the bent front end of the reflecting sheet is overlapped with the light exiting surface of the light guide plate. An illumination unit that is located outside .
  2. The housing is electrically conductive, the lighting unit according to claim 1, characterized in that has conductivity to the light source and the opposite surface of the reflective sheet.
  3. A reflective sheet having a predetermined shape that forms a portion surrounding the light source is disposed in the casing together with the light source, a light guide plate that guides light from the light source is disposed on the irradiation surface side of the reflective sheet, and light is emitted on the output surface of the light guide plate In the manufacturing method of the lighting unit for arranging the correction sheet,
    The light correction sheet is arranged in a state where the upper end side of the light source surrounding the light source of the reflection sheet is folded so as to overlap the light exiting surface of the light guide plate, and the light correction sheet is made by utilizing the repulsive force of the bending end of the reflection sheet. The lighting unit is configured so as to be in contact with the back surface of the reflective sheet , and is configured such that the bent leading end portion of the reflection sheet is positioned outside the outer periphery of the polarizing plate disposed on the light exit surface side of the light correction sheet. Manufacturing method.
  4. A liquid crystal display device comprising: the illumination unit according to claim 1; and a liquid crystal panel disposed on an irradiation surface side of the illumination unit.
JP2001142828A 2001-05-14 2001-05-14 Lighting unit, its manufacturing method, and liquid crystal display device using the lighting unit Expired - Fee Related JP4707260B2 (en)

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