JP4125746B2 - Backlight device and liquid crystal display device - Google Patents

Description

  The present invention relates to a backlight device and a liquid crystal display device, and more particularly to a linear light source direct type backlight device that is installed on the back side of a liquid crystal display panel and emits light to the liquid crystal display panel, and the backlight device. The present invention relates to a liquid crystal display device.

  In recent years, liquid crystal display devices are widely used as display means for various information terminal monitors such as personal computers and mobile phones, or television receivers. This type of liquid crystal display device is made visible by applying light to an electronic image formed on a liquid crystal display panel. In small information equipment, there is a structure that uses ambient light as a light source for this visualization, but in order to observe a good image on a relatively large screen regardless of the state of ambient light, a liquid crystal display panel In many cases, an illumination light source is provided and an electronic image formed on the liquid crystal display panel is illuminated with illumination light from the illumination light source.

  A small liquid crystal display device has a structure in which a so-called front light device is installed as an illumination light source in front of or near the periphery of the liquid crystal display panel. However, in a notebook computer, a computer monitor and a television receiver, An illumination light source called a backlight device installed on the side is employed.

  There are roughly two types of backlight devices, one of which is a side-edge type backlight device used for notebook computers and computer monitors where the depth of equipment is limited, and the other is high brightness. For a relatively large computer monitor or television receiver that requires the above, it is a direct type backlight device installed directly under the back of the liquid crystal display panel.

  In these backlight devices, many cold cathode fluorescent lamps are mainly used as illumination light sources. The side edge type backlight device using this cold cathode fluorescent lamp is constructed by arranging the cold cathode fluorescent lamp on the side of the light guide installed on the back of the liquid crystal display panel, so it is relatively compact. Although it has the advantage that it can be used, it has the disadvantage that the light utilization efficiency is low, and the direct type backlight device is constructed by arranging multiple cold cathode fluorescent lamps without arranging a light guide on the back side of the liquid crystal display panel Therefore, there is an advantage that the light utilization efficiency is high, but there is a disadvantage that the thickness of the backlight device itself is increased.

  A plurality of straight tube type cold cathode fluorescent lamps as light sources, a light diffusion plate arranged on the liquid crystal display panel side of each of these cold cathode fluorescent lamps, a polarization conversion film and a prism sheet, and each cold cathode fluorescent lamp For example, Patent Document 1 below discloses a backlight device including a reflecting plate installed on the back side of a lamp. Also, a liquid crystal display device configured to install this type of backlight device on the back side of the liquid crystal display panel and irradiate the light source light on the back surface of the liquid crystal display panel is disclosed in, for example, Patent Document 2 below. Has been.

JP 2002-82626 A JP-A-6-75216

  However, in the liquid crystal display device configured as described above, the backlight device BL is disposed at a predetermined distance on the back side of the liquid crystal display panel PNL that performs digital display as shown in an enlarged cross-sectional view of the main part in FIG. . The backlight device BL includes a plurality of straight tube type cold cathode fluorescent lamps CFL as light sources, a diffusion plate DFP and a diffusion sheet DFS disposed on the liquid crystal display panel PNL side of each cold cathode fluorescent lamp CFL, and brightness enhancement The sheet BRS, the polarization reflection sheet PRS, and the reflection plate REP installed behind each of the cold cathode fluorescent lamps CFL constitute a diffuse reflection type backlight.

  As the diffusion plate DRP having the above configuration, a dairy plate is generally used, and in the configuration using this dairy plate as the diffusion plate DRP, the radiating plate is radiated from a plurality of cold cathode fluorescent lamps CFL and the reflection plate REP as illustrated. Light is incident on the milk plate (diffusion plate DFP). However, due to the large amount of light absorption and return light by the light diffusion plate DFP, the light utilization efficiency decreases, and a predetermined luminance (light quantity) is obtained. There was a problem that it was not possible.

  Further, in order to obtain a predetermined luminance (light quantity), it is necessary to increase the number of cold cathode fluorescent lamps CFL used, which causes a problem that the cost of the backlight device increases.

  In addition, although the luminance can be improved by increasing the number of cold cathode fluorescent lamps, the power consumption of the backlight device is increased, and further, the temperature of the backlight device is increased, and the diffusion plate DFP is increased. New problems such as adverse effects such as thermal deformation of various sheets installed on the upper surface and deterioration of display quality of a display image displayed on the liquid crystal display panel PNL occur.

  Accordingly, the present invention has been made to solve the above-described conventional problems, and the object thereof is to improve the utilization efficiency of light emitted from the cold cathode fluorescent lamp and reduce the number of cold cathode fluorescent lamps. An object of the present invention is to provide a backlight device that can achieve low cost.

Another object of the present invention is to provide a liquid crystal display device capable of obtaining a high-quality display image with high luminance on a display screen of a liquid crystal display panel using a backlight device directly under a cold cathode fluorescent lamp.

  In order to achieve such an object, a backlight device according to the present invention is installed in parallel at equal intervals so as to face the back of the liquid crystal display panel, and planar light source light is applied to the back of the liquid crystal display panel. A plurality of linear light sources to be irradiated, and a molded body of a metal material that is installed opposite to the back surfaces of the plurality of linear light sources and in which concave portions are integrally formed along a longitudinal direction facing the plurality of linear light sources. By constituting the reflector, the problem of the background art can be solved by making the light emitted from the plurality of linear light sources into the planar light source light reflected by the surface of the recess.

  Another backlight device according to the present invention is installed in parallel at equal intervals so as to face the back surface of the liquid crystal display panel, and a plurality of linear light sources that irradiate the back surface of the liquid crystal display panel with planar light source light. And a reflector made of a molded product of a resin material that is installed facing the back surface of the plurality of linear light sources and has a concave portion integrally formed along the longitudinal direction facing the plurality of linear light sources. Thereby, the problem of background art can be solved by making the light emitted from a plurality of linear light sources into the planar light source light reflected by the surface of the recess.

  Still another backlight device according to the present invention is arranged in parallel at equal intervals so as to face the back surface of the liquid crystal display panel, and has a plurality of linear shapes that irradiate the back surface of the liquid crystal display panel with planar light source light. A light source and a reflector made of a molded body of a resin material that is installed opposite to the back surfaces of the plurality of linear light sources and in which a concave portion is integrally formed along the length direction facing the plurality of linear light sources; By configuring the reflector with a reflective film formed on the concave surface of the reflector, the light emitted from a plurality of linear light sources is converted into a planar light source light reflected by the reflective film. Can be solved.

  In the backlight device according to the present invention, preferably, in the above configuration, the concave portion is a substantially elliptical curved surface surrounding the plurality of linear light sources from the back side, so that the light emitted from the linear light source is reflected. Technical issues can be solved.

  The backlight device according to the present invention is preferably configured as described above, wherein a plurality of reflectors are arranged in the recesses of the reflectors in the vicinity of the center of the bottom portion along the length direction of the linear light source. By having the mouth, since the light emitted from the linear light source is reflected without optically affecting, the problem of the background art can be solved.

  The backlight device according to the present invention preferably has a bulb gate port after injection molding in the lengthwise direction of the linear light source in the vicinity of the center of the bottom in a part of the concave portion of each reflector in the above configuration. Since the light emitted from the linear light source is reflected without optically affecting it, the problem of the background art can be solved.

  In the backlight device according to the present invention, preferably, in the above-described configuration, the resin material is a cycloolefin resin, so that it is difficult for the reflector to undergo shape deformation caused by injection molding, and a mirror-like light reflecting film is formed. Therefore, since the light emitted from the linear light source is reflected, the problem of the background art can be solved.

  The liquid crystal display device according to the present invention includes a liquid crystal display panel configured by sandwiching a liquid crystal layer between a pair of transparent substrates having electrodes for forming pixels on the inner surface, and optical compensation installed on the back surface of the liquid crystal display panel. A sheet laminate and a backlight device installed on the back surface of the optical compensation sheet laminate, the backlight device is arranged in parallel and equidistantly facing the back surface of the liquid crystal display panel; And a plurality of linear light sources that irradiate the back surface of the liquid crystal display panel with the planar light source light, and a length direction that faces the back surfaces of the plurality of linear light sources and faces the plurality of linear light sources. By constructing a metallic reflector with a concave portion integrally formed along the back surface, the back surface of the liquid crystal display panel is irradiated with high-intensity reflected light from the backlight device, so that the problems of the background art can be solved. it can.

  Another liquid crystal display device according to the present invention is installed on the back surface of a liquid crystal display panel configured by sandwiching a liquid crystal layer between a pair of transparent substrates having pixels for forming electrodes on the inner surface. An optical compensation sheet laminate and a backlight device installed on the back of the optical compensation sheet laminate, the backlight device being arranged in parallel at equal intervals facing the back of the liquid crystal display panel A plurality of linear light sources that irradiate the back surface of the liquid crystal display panel with the planar light source light, and a length that faces the back surfaces of the plurality of linear light sources and faces the plurality of linear light sources. By constructing it with a reflector made of a molded product of a resin material in which concave portions are integrally formed along the direction, the backlight device irradiates the back surface of the liquid crystal display panel with high-intensity reflected light. Solve the problem It is possible.

  Still another liquid crystal display device according to the present invention is provided on a back surface of a liquid crystal display panel configured by sandwiching a liquid crystal layer between a pair of transparent substrates having pixels for forming electrodes on the inner surface. The optical compensation sheet laminate and a backlight device installed on the back of the optical compensation sheet laminate, the backlight device being arranged in parallel at equal intervals facing the back of the liquid crystal display panel A plurality of linear light sources that are installed and irradiate the back surface of the liquid crystal display panel with the planar light source light, and a length that is installed facing the back surfaces of the plurality of linear light sources and that faces the plurality of linear light sources. A backlight is formed on the back surface of the liquid crystal display panel by comprising a reflector made of a molded product of a resin material in which recesses are integrally formed along the length direction, and a reflection film formed on the inner surface of the recesses of the reflector. High brightness from equipment Since the reflected light is irradiated, it is possible to overcome the drawbacks of the related art.

  In the liquid crystal display device according to the present invention, preferably, in the above configuration, the concave portion of the reflector is a substantially elliptic curved surface surrounding the plurality of linear light sources from the back, so that the light emitted from the linear light source is reflected, Since the high-brightness reflected light is irradiated on the back surface of the display panel, the problems of the background art can be solved.

  In another liquid crystal display device according to the present invention, preferably, in the above-described configuration, a plurality of reflectors are arranged in the concave portion of each reflector in the vicinity of the center of the bottom portion along the length direction of the linear light source. By having the valve gate opening, the back surface of the liquid crystal display panel is irradiated with high-luminance reflected light without being optically affected, so that the problem of the background art can be solved.

  Still another liquid crystal display device according to the present invention is preferably configured as described above, wherein the reflector is a valve gate after injection molding along the longitudinal direction of the linear light source in the vicinity of the center of the bottom in a part of the recess of each reflector. By having the mouth, the back surface of the liquid crystal display panel is irradiated with high-intensity reflected light without being optically affected, so that the problem of the background art can be solved.

  The liquid crystal display device according to the present invention preferably has a mirror-like reflective surface formed on the inner surface of the concave portion of the reflector by using a cycloolefin resin as the resin material in the above configuration. Therefore, the problem of the background art can be solved because high-intensity reflected light is irradiated without being affected by the effect.

  The present invention is not limited to the above-described configuration, and various modifications can be made without departing from the technical idea of the present invention.

  According to the backlight device of the present invention, the light emitted from the plurality of linear light sources is reflected by the reflector, so that an extremely excellent effect that a high-luminance planar light source with high light utilization efficiency can be obtained. Have In addition, when obtaining a desired luminance, it is possible to reduce the number of linear light sources, thereby obtaining an extremely excellent effect that a backlight device with high luminance emission can be realized at a low price. .

  In addition, according to the liquid crystal display device of the present invention, since the backlight device irradiates the back surface of the liquid crystal display panel with high-luminance planar light source light, high-luminance and high-quality image display can be realized at low cost. It is possible to obtain extremely excellent effects such as

  Hereinafter, specific embodiments of a backlight device and a liquid crystal display device including the backlight device according to the present invention will be described in detail with reference to the drawings of the respective examples.

  FIG. 1 is an enlarged perspective view of an essential part for explaining the principle of a backlight device according to the present invention. In addition, in this FIG. 1, the structure of only the principal part is shown and other structural members are not illustrated. In FIG. 1, a backlight device BL directly under a linear light source according to the present invention includes cold cathode fluorescent lamps CFL as a plurality of linear light sources that emit light from a light source facing a back surface of a liquid crystal display panel (not shown). They are installed in parallel at intervals.

  In addition, on the back side of the plurality of cold cathode fluorescent lamps CFL, a concave portion having a substantially elliptic curved surface so as to surround each cold cathode fluorescent lamp CFL from the back side along the length direction of the cold cathode fluorescent lamp CFL. A concave groove DTH is integrally formed, and a reflecting plate REP is provided in which the surface of the concave groove DTH serves as a light reflecting surface. The reflection plate REP is formed by integral molding of a light reflective metal plate such as an aluminum plate, for example.

  In the backlight device BL configured in this way, the light emitted from the plurality of cold cathode fluorescent lamps CFL is irradiated toward the back of a liquid crystal display panel (not shown), a part of which is installed above. Most of the other part is specularly reflected (regularly reflected) with a reflectivity of about 95% or more by the surface of the concave groove DTH having a substantially elliptic curved surface of the reflector REP, toward the back side of the liquid crystal display panel installed on the upper part. Irradiated as planar light source light. The specular reflection referred to here is light reflection in which the angle at which the light emitted from the cold cathode fluorescent lamp CFL is incident on the light reflecting surface having a substantially elliptic curved surface is equal to the angle at which the light is reflected from the light reflecting surface. .

  According to such a configuration, the light emitted from the plurality of cold cathode fluorescent lamps CFL to the surface of the concave groove DTH of the reflection plate REP is specularly reflected toward the back surface of the liquid crystal display panel. Efficiency is greatly improved, and high-luminance planar light source light can be obtained.

  FIG. 2 is a longitudinal sectional view of an essential part for explaining the configuration of Embodiment 1 of the backlight device according to the present invention and a liquid crystal display device equipped with the backlight device. In FIG. 2, reference numeral PNL is a liquid crystal display panel as a display panel configured by sandwiching a liquid crystal layer between a pair of translucent substrates each having an electrode for pixel formation on the inner surface. The liquid crystal layer is sandwiched between the first substrate SUB1 and the second substrate SUB2, and the inner surface of both or one of the first substrate SUB1 and the second substrate SUB2 made of a translucent glass plate is used. It has an electrode for pixel formation or an active element. Note that the first substrate SUB1 on which an active element such as a thin film transistor (TFT) is formed is referred to as an active matrix substrate, and one using a thin film transistor is also referred to as a TFT substrate.

  The first polarizing plate POL1 is laminated on the first main surface (backlight device side), and the second polarizing plate POL2 is laminated on the second main surface (display surface side) by pasting or the like. is set up. Furthermore, an optical compensation sheet laminate OPS is installed on the back side of the liquid crystal display panel PNL at a predetermined distance. The optical compensation sheet laminate OPS is configured by laminating a prism lens PZL, a diffusion sheet DFS, and a polarization reflection sheet PRS in this order from the backlight device side to be described later.

  Further, a backlight device BL according to the present invention is installed on the back side of the optical compensation sheet laminate OPS. In the backlight device BL, a plurality of cold cathode fluorescent lamps CFL that irradiate the back surface of the liquid crystal display panel PNL with a predetermined distance facing the back surface of the optical compensation sheet laminate OPS are arranged in parallel at equal intervals. Arranged and installed. Although not shown, the plurality of cold cathode fluorescent lamps CFL are sandwiched by, for example, side molds and are arranged and supported in parallel at predetermined intervals.

  Further, a plurality of the cold cathode fluorescent lamps CFL arranged on the back side has a concave groove DTH having a substantially elliptic curved surface so as to surround each cold cathode fluorescent lamp CFL from the back side along the length direction of the cold cathode fluorescent lamp CFL. Are formed integrally, and a reflector REM made of a molded body of a heat resistant resin material that forms a light reflecting surface on the surface of the concave groove DTH is disposed.

  In addition, in this reflector REM, as shown in the enlarged sectional view of the main part in FIG. 3A and the enlarged plan view in FIG. Valve gate ports VG that remain as traces after injection molding of the reflector REM are dotted along the length direction of the lamp CFL and are integrally formed. The diameter of the bulb gate VG is about 3 mm, which is smaller than the diameter of the cold cathode fluorescent lamp CFL. Further, as shown in FIG. 2, a flange portion FLG for integrally mounting and holding the optical compensation sheet laminate OPS and the like at a predetermined position is integrally formed at the peripheral portion of the reflector REM.

  Further, the reflector REM is formed by depositing a light reflective metal such as aluminum or silver on the bottom surface including the plurality of concave grooves DTH and the valve gate port VG by means such as sputtering or vapor deposition. Thus, a metal reflection film RES is formed.

  In addition, it replaces with what forms the valve gate port VG in the bottom part of one part ditch | groove DTH in the center part of each reflector REM as mentioned above, and the bottom part center vicinity of the ditch | groove DTH of each reflector REM is located. A plurality of valve gates VG after injection molding can be scattered substantially evenly along the length direction.

  In the backlight device BL configured in this way, as shown in the enlarged sectional view of the main part in FIG. 4, the emitted light emitted from each cold cathode fluorescent lamp CFL is the surface of each concave groove DTH having a substantially semi-elliptical curved shape. The mirror reflection (regular reflection) is performed almost entirely toward the optical compensation sheet OPS by the metal reflection film RES formed on the substrate. As a result, the light emitted from the cold cathode fluorescent lamp CFL can be used efficiently, and the light is efficiently transmitted without generating light absorption and return light by the optical compensation sheet laminate OPS, and the back surface of the liquid crystal display panel PNL. Is irradiated as planar light source light.

  Accordingly, planar light source light can be obtained in which the utilization efficiency of the emitted light emitted from the cold cathode fluorescent lamp CFL is greatly improved. Therefore, in order to obtain a predetermined luminance (light quantity), the number of cathode fluorescent lamps CFL to be installed is reduced. Thus, the backlight device BL can be provided at a low price. Further, the power consumption of the backlight device BL can be reduced. Furthermore, when the number of cold cathode fluorescent lamps CFL is set to the same number, it is possible to project high-luminance planar light source light with high use efficiency of emitted light onto the back surface of the liquid crystal display panel PNL.

  FIG. 5 is an enlarged cross-sectional view of a main part for explaining a schematic configuration of the manufacturing apparatus 10 for forming the reflector REM of the backlight device BL according to the present invention. FIG. FIG. 5B shows a state in which the reflector REM formed of a resin material is projected by the ejector pin 18 after the mold is opened. In the figure, the same reference numerals indicate the same parts.

  In FIG. 5A, a resin material melted in a state in which the fixed side mold 11 and the corresponding movable side mold 12 that have been subjected to the concave groove processing are closed is injected from the nozzle 15 through the injection screw 14, and the cavity 13 is filled into the reflector REM.

  Thereafter, the movable platen 16 provided on the movable die 12 is moved, and the fixed die 11 and the movable die 12 provided on the fixed plate 17 are opened. When the mold is opened, the cooling and solidification of the reflector REM is not progressing because the contact time of the fixed mold 11 is shorter than that of the movable mold 12 and the mold release resistance is not increased. 11, the tension (tension) and the plane (mirror surface) in the longitudinal / short direction in the cavity 13 of the movable mold 12 are larger than the concave groove machining surface, and the reflector REM sticks to the movable mold 12. Moving. Therefore, there is no problem in the releasability of the reflector REF from the fixed mold 11.

  Next, as shown in FIG. 5B, the reflector REF is projected by the ejector pin 18. At this time, since the reflector REM is in contact with the movable mold 12 even after the mold is opened, the concave groove surface of the reflector REF has a smaller contact area with the mold than the concave surface, so that the mold release resistance is reduced. Is small and releasability is good.

  Therefore, the reflector REM can be released from the cavity 13 with a small force, so that deformation of the reflector REM and generation of cracks can be reliably suppressed.

  The reflector REM formed in this way is formed by integrally forming a plurality of valve gates VG in the bottom portion of each concave groove DTH along the length direction so as to be integrally formed. Since the molten resin material is simultaneously injected from the valve gate VG and the flow is made uniform, it is possible to suppress the thinning and shape deformation caused by the injection molding of the reflector REM and to prevent the weld. It is difficult to form such a step.

  Further, the reflector REM configured as described above is used as a reflector for a liquid crystal television configured by a large liquid crystal display panel such as a 32 type or a 42 type, so that the above phenomenon is likely to occur. Since it is known and the occurrence of thinning and deformation due to such an increase in size can be reliably suppressed, it is extremely effective.

  FIG. 6 is a longitudinal sectional view of an essential part for explaining the configuration of Embodiment 2 of the backlight device according to the present invention and a liquid crystal display device on which the backlight device is mounted, and the same parts as those shown in FIG. The description is omitted. 6 differs from FIG. 2 in that the reflector REC disposed on the back side of the cold cathode fluorescent lamps CFL arranged at equal intervals is formed only from a molded body of cycloolefin resin material. In this configuration, a reflecting film is not formed on the surface of the reflector REC. That is, the surface in each ditch DTH is formed with a reflection function without using a reflection film.

  In such a configuration, by using a cycloolefin resin material as the material for forming the reflector REC, the cycloolefin resin is a resin that has excellent flow and extremely high transferability to the mold surface. Even if the temperature is set to a low temperature of about 120 ° C. where productivity is high, the weld line can be erased, so that the temperature of taking out from the mold is lowered, and the shape of the reflector REC is not easily deformed. Therefore, the reflector REC can be manufactured at a low cost.

  Further, in such a configuration, when the reflector REC is formed of a molded product of a cycloolefin resin material, a reflective function with high light reflectivity that is almost equivalent to that of the reflective film can be obtained without using a metal reflective film. Further, the valve gate port VG remaining as a trace after injection molding formed along the length direction of the cold cathode fluorescent lamp CFL in the vicinity of the bottom center of each concave groove DTH is directly below the length direction of the cold cathode fluorescent lamp. Therefore, there is no optical or physical influence.

  In each of the above embodiments, the case where the reflector is formed of a heat-resistant resin material or a molded product of a cycloolefin resin material has been described, but the present invention is not limited thereto, Even if it is formed of a molded body in which reflective metal powder such as aluminum, silver or an alloy thereof is mixed, the same effect as described above can be obtained without forming a reflective film on the surface of the concave groove DTH.

  Therefore, the backlight device BL according to each of the above-described embodiments is disposed on the back surface of the liquid crystal display panel PNL, so that a high-luminance planar light source is provided on the back surface of the liquid crystal display panel PNL via the optical compensation sheet laminate OPS. Since the light is irradiated, an image display with high luminance and high color reproducibility can be obtained on the liquid crystal display panel PNL.

  7 and 8 are diagrams for specifically explaining an example of the entire configuration of the liquid crystal display device according to the present invention. FIG. 7 is a plan view seen from above, and FIG. 7 and 8, the backlight device BL includes an upper mold frame UMLD made of a resin molded body, an optical compensation sheet OPS made of a prism lens PZL, a diffusion sheet DFS, and a polarization reflection sheet PRS, an upper side mold, and a lower mold. A plurality of cold cathode fluorescent lamps CFL sandwiched between both ends of a side mold SMLD composed of side side molds, and concaves that are reflective surfaces along the length direction on the back side of the plurality of cold cathode fluorescent lamps CFL. A reflection plate REP integrally formed with the groove DTH and a lower mold frame LMLD holding the reflection plate REP are sequentially stacked, and as shown in FIG. 7, between the upper mold frame UMLD and the lower mold frame LMLD. It is integrated and configured by sandwiching them and joining them together.

  In the liquid crystal display device configured as described above, the liquid crystal display panel PNL includes a backlight device including a plurality of cold cathode fluorescent lamps CFL and a reflecting plate REP having a concave groove DTH formed on the surface as a reflecting surface. High-luminance planar light source light from BL is irradiated through the optical compensation sheet laminate OPS, and an electronic latent image formed on the liquid crystal display panel PNL is visualized and emitted to the viewer's eyes for recognition. .

  FIG. 9 is an external view of a television receiver which is an example of an electronic device in which a liquid crystal display module is mounted as the liquid crystal display device of the present invention. In FIG. 9, the television receiver includes a display unit DSP and a stand unit STD, and a liquid crystal display device having a liquid crystal display panel PNL having a relatively large screen is mounted on the display unit DSP. The effective display area of the liquid crystal display panel PNL serving as the screen of the liquid crystal display device is exposed to the display unit DSP. A liquid crystal display device capable of obtaining a high-luminance and high-quality display image can be realized by mounting a backlight device capable of obtaining a high-luminance planar light source according to the present invention on the display unit DSP of the television receiver.

  In the above-described embodiment, the case where the cold cathode fluorescent lamp direct type backlight device is applied to a liquid crystal television receiver on which a liquid crystal display panel is mounted has been described. The same effects as described above can be obtained even when applied to display devices such as in-vehicle liquid crystal displays (liquid crystal car navigation), game machine liquid crystal displays, medical liquid crystal monitors, and printing / design liquid crystal monitors.

It is a principal part expansion perspective view explaining the principle of the backlight apparatus by this invention. It is principal part sectional drawing which shows the structure by Example 1 of the backlight apparatus by this invention and the liquid crystal display device using this backlight apparatus. FIG. 3 is an enlarged view of a main part showing details of the configuration of the backlight device shown in FIG. 2, in which FIG. 3 (a) is a sectional view and FIG. 3 (b) is a plan view seen from above. FIG. 4 is an enlarged cross-sectional view of a main part showing a configuration of a liquid crystal display device equipped with the backlight device shown in FIG. FIG. 5A is an enlarged cross-sectional view of a main part for explaining a schematic configuration of a manufacturing apparatus for forming a reflector of a backlight device according to the present invention, and FIG. FIG. 5B is a diagram showing a state in which a reflector formed of a resin material is projected by an ejector pin after the mold is opened. It is principal part sectional drawing which shows the structure by Example 2 of the backlight apparatus by this invention and the liquid crystal display device using this backlight apparatus. It is the principal part top view seen from the upper part which shows an example of the liquid crystal display device by this invention. It is a principal part expansion perspective view which shows an example of the liquid crystal display device by this invention. It is an external view which shows the television receiver provided with the liquid crystal display device by this invention. It is a principal part expanded sectional view which shows the structure of the conventional liquid crystal display device.

Explanation of symbols

PNL ... liquid crystal display panel, SUB1 ... first substrate, SUB2 ... second substrate, POL1 ... first polarizing plate, POL2 ... second polarizing plate, OPS ... Optical compensation sheet laminate, PZL ... prism lens, DFS ... diffusion sheet, PRS ... polarization reflection sheet, BL ... backlight device, REP ... reflector, REM ... reflector, REC ... reflector, RES ... reflective film, DTH ... concave groove, VG ... bulb gate port, FLG ... flange, CFL, cold cathode fluorescent lamp, USM ... upper side Mold, LSM ... Lower side mold, SMLD ... Side mold, UMLD ... Upper mold frame, LMLD ... Lower mold frame, SMLD ... Side mold, DSP ... Display , STD ··· stand.

Claims (6)

A plurality of linear light sources that are arranged in parallel at equal intervals facing the back surface of the liquid crystal display panel, and irradiate the light source light on the back surface of the liquid crystal display panel;
A reflector formed of a molded body of a metal material that is installed opposite to the back surface of the plurality of linear light sources and in which a concave portion is integrally formed along a length direction facing the plurality of linear light sources;
The concave portion of the reflector is an elliptical curved surface that surrounds the plurality of linear light sources from the back side,
A backlight device comprising: a plurality of injection-molded valve gate ports arranged in the length direction of the linear light source in the vicinity of the center of the bottom of the concave portion of the reflective pair .   A plurality of linear light sources that are arranged in parallel at equal intervals facing the back surface of the liquid crystal display panel, and irradiate the light source light on the back surface of the liquid crystal display panel;
A reflector made of a molded body of a resin material that is installed opposite to the back surface of the plurality of linear light sources and that is integrally formed with a recess along a length direction facing the plurality of linear light sources,
  The concave portion of the reflector is an elliptical curved surface surrounding the plurality of linear light sources from the back side;
  A backlight device comprising a plurality of post-injection molded valve gate openings disposed along the length direction of the linear light source in the vicinity of the center of the bottom of the concave portion of the reflector.   In claim 1 or 2,
  The reflector includes a bulb gate port after injection molding disposed in the vicinity of the center of the bottom of the concave portion of each reflector along the length direction of the linear light source. .   In claim 1 or 2,
  The said reflector has the valve gate port after the injection molding arrange | positioned in the bottom center vicinity of the said recessed part of a part of each reflector, The backlight apparatus characterized by the above-mentioned.   In claim 2,
  The said resin material is cycloolefin resin, The backlight apparatus characterized by the above-mentioned.   In claim 2,
  A backlight device, wherein the resin material contains a reflective metal powder.

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