WO2006126315A1

WO2006126315A1 - Linear light source, illumination device for display device, having the linear light source, and display device using the illumination device

Info

Publication number: WO2006126315A1
Application number: PCT/JP2006/303324
Authority: WO
Inventors: Daisuke Teragawa
Original assignee: Sharp Kabushiki Kaisha
Priority date: 2005-05-24
Filing date: 2006-02-23
Publication date: 2006-11-30

Abstract

The inside of an outer peripheral wall (34a) of an elongate linear light source (3) is circumferentially equally partitioned by partition walls (34b). A pair of inner electrodes (33b) is received in each of the partitioned spaces and fluorescent bodies (31c, 32c, 33c) are applied on the inner surfaces of the individual outer peripheral walls (34a), and thereby fluorescent lamps (31, 32, 33) emitting light of different colors are formed. The linear light source (3) is formed by the fluorescent lamps (31, 32, 33) twisted, entwined, and wound around each other, and is capable of eliminating color irregularities of each color emitted from the lamps.

Description

LINEAR LIGHT SOURCE, LIGHTING DEVICE FOR DISPLAY DEVICE HAVING THE SAME, AND DISPLAY DEVICE USING THE SAME

Technical field

The present invention relates to a linear light source used for a liquid crystal panel or the like, a lighting device for a display device including the linear light source, and a display device using the linear light source.

Background art

[0002] As a conventional technique related to a light source for a display panel, a cylindrical fluorescent lamp is divided by a glass wall, and is divided into three in the circumferential direction to emit one of the three colors of fluorescent lamp power RGB (For example, see Patent Document 1). By rotating the light source around the axis, the three colors can be emitted uniformly, although there is a time shift, and color unevenness can be eliminated in the image on the display panel.

Patent Document 1: Japanese Utility Model Publication No. 4 85952 (Fig. 1)

Disclosure of the invention

Problems to be solved by the invention

[0003] However, in the above-described conventional technology, a driving source, a sensor, a power supply device, and the like for rotating the light source are required. To accommodate these, the lighting device is increased in size, and the device is manufactured. There was a problem of increasing the cost. The present invention has been completed based on the above circumstances, and uses a linear light source capable of uniformly emitting each color, a small display device illumination device including the linear light source, and the same. An object is to provide a display device. Means for solving the problem

[0004] The linear light source of the present invention is a discharge lamp that is formed to be surrounded by a wall that allows visible light to pass and is discharged between a pair of electrodes accommodated therein to emit light in a predetermined color. A plurality of the discharge lamps emit light in different colors, and the plurality of discharge lamps are entangled so as to twist each other.

By doing so, each color can be emitted evenly, and a linear light source capable of eliminating color unevenness can be obtained. [0005] Further, the linear light source of the present invention is long and surrounded by a wall that allows visible light to pass, and at least one side thereof is discharged between a pair of electrodes provided on the outer peripheral surface of the wall. Thus, a plurality of discharge lamps that emit light in a predetermined color are provided, and the plurality of discharge lamps emit light in different colors, and the plurality of discharge lamps are entangled so as to twist each other.

By doing so, each color can be emitted evenly, and a linear light source capable of eliminating color unevenness can be obtained. In addition, since the electrode provided outside the wall body does not directly emit electrons by discharge, the life can be extended.

[0006] As an embodiment of the present invention, the following configuration is preferable.

(1) A plurality of discharge lamps can be individually energized. This makes it possible to individually control the operation and light emission amount of each discharge lamp.

(2) The plurality of discharge lamps are spirally wound around each other. This makes it possible to easily equalize the amount of light emitted from each color on the surface of the light source.

(3) Two discharge lamps were provided. As a result, the control for toning can be easily performed only by the emission of two colors.

(4) The plurality of discharge lamps are provided in multiples of three, and they have the same number of those that emit red light, those that emit green light, and those that emit blue light. This makes it possible to perform toning of all colors using the three colors of the video signal.

(5) Four or more discharge lamps are provided, and are formed to emit light of four or more different colors (for example, red light, green light, blue light, and yellow light). This facilitates toning of more colors using more light sources than the three colors of the video signal.

(6) The wall body is integrally formed by a cylindrical outer peripheral wall and a partition wall that divides the inside thereof in the circumferential direction, and includes a pair of electrodes in the partitioned interior. As a result, the wall body can be formed at the same time, and a plurality of discharge lamps can be integrated, so that a compact and low-cost linear light source can be obtained.

(7) The discharge lamp is a fluorescent lamp. As a result, various colors of light can be emitted by selecting the phosphor.

(8) The discharge lamp is a cold cathode tube. This compares with incandescent or halogen lamps. It is small and light intensity with respect to power consumption can be improved.

(9) The discharge lamp is a hot cathode tube. Thereby, the luminous intensity with respect to power consumption can further be improved.

(10) The wall of the discharge lamp blocks ultraviolet rays, and the inner surface thereof is coated with a phosphor that emits light of a predetermined color. Thereby, it is possible to accurately emit a desired color that prevents ultraviolet rays from entering other discharge lamps.

(11) A plurality of discharge lamps that emit light of a predetermined color are provided, the plurality of discharge lamps emit light of different colors, and a linear light source is formed that is entangled so that the plurality of discharge lamps are twisted with each other. It was set as the illuminating device for display apparatuses. As a result, a lighting device for a display device that can eliminate uneven color can be obtained. Further, since a device such as a drive source for rotating the linear light source is not required, the size can be reduced.

(12) An illumination device for a display device in which a linear light source is formed on a reflecting plate. As a result, a lighting device with high luminance can be obtained.

(13) An illumination device for a display device is provided in which a linear light source is installed at an end of a plate-like light guide and the light emission is multiply reflected by the light guide. As a result, it is possible to reduce the thickness of the lighting device and to reduce the temperature rise of the illumination surface.

(14) A display panel capable of displaying an image is installed in front of a lighting device for a display device having a linear light source in which a plurality of discharge lamps emitting different colors are intertwined so as to twist each other. Display device. Thus, a color display or the like can be eliminated without requiring a color filter or the like, and a small display device that can easily form an image can be obtained.

(15) A display panel capable of displaying an image is installed behind a lighting device for a display device having a linear light source in which a plurality of discharge lamps emitting different colors are intertwined so as to twist each other. The display device is characterized by the above. As a result, a color display or the like is not required, color unevenness can be eliminated, and a small display device that can easily form an image can be obtained.

(16) By adjusting the discharge amount of the discharge lamp, the luminous intensity is controlled, and the display device forms an image on the display panel. As a result, it is not necessary to control the amount of light emission by the gradation on the panel side. Or, depending on the gradation on the panel side, etc. By adjusting the luminous intensity of the discharge lamp in addition to adjusting the amount of emitted light, finer and more powerful color adjustment can be performed.

(17) A display device that forms an image on a display panel by sequentially switching on and off a plurality of discharge lamps having different emission colors. Thus, a display device with high resolution that does not require subdividing the pixels can be obtained.

The invention's effect

[0007] Since each color can be emitted uniformly and a linear light source capable of eliminating color unevenness can be obtained, a driving source, a sensor, a power supply device and the like for rotating the light source are not required, and the lighting device is small. The cost of the apparatus can be reduced.

Brief Description of Drawings

FIG. 1 is an exploded perspective view of a liquid crystal display using a linear light source according to Embodiment 1.

FIG. 2 is an external view of a linear light source according to Embodiment 1.

FIG. 3 is an external view in which an end portion of the linear light source shown in FIG. 2 is cut away.

4 is a cross-sectional view of the linear light source shown in FIG.

FIG. 5 is a cross-sectional view of a linear light source according to a first modification of Embodiment 1.

FIG. 6 is a cross-sectional view of a linear light source according to a second modification of Embodiment 1.

FIG. 7 is an external view of a linear light source according to a third modification of Embodiment 1.

FIG. 8 is an external view of a linear light source according to Embodiment 2.

FIG. 9 is an external view of a linear light source according to a modification of the second embodiment.

FIG. 10 is an external view of a linear light source using two fluorescent lamps.

FIG. 11 is an external view of a linear light source using four fluorescent lamps.

FIG. 12 is an external view of a liquid crystal display in which a display panel is installed in front of a sidelight illumination device using a linear light source according to Embodiment 1.

FIG. 13 is an external view of a liquid crystal display in which a display panel is installed behind a sidelight type illumination device using a linear light source according to Embodiment 1.

Explanation of symbols

[0009] 1, 8, 8A ... Liquid crystal display

2, 81 ... Backlight device 3, 3A, 5, 5A, 6, 7, ... Linear light source

4, 85 ... Display panel

21a, 82 ··· Reflector

31, 32, 33, 35, 36, 37, 51, 52, 53, 55, 56, 57, 61, 62, 71, 72, 73, 74… Fluorescent lamp

31c, 32c, 33c ... phosphor

33b, 37b ... Internal electrode

34, 38, 54, 58, 63, 75

34a… Outer wall

34b… Division wall

39, 55b, 56b, 57b ... External electrode

83, 86

BEST MODE FOR CARRYING OUT THE INVENTION

[0010] <Embodiment 1>

Embodiment 1 of the present invention will be described with reference to FIGS. The liquid crystal display 1 according to the present embodiment corresponds to the display device of the present invention, and is arranged in front of the knocklight device 2 (corresponding to the illumination device for display device of the present invention) and can display an image. Consists of display panel 4. The knocklight device 2 includes a tray 21 that accommodates a plurality of long linear light sources 3, a light control plate 22 disposed immediately above the tray 21, and a diffusion plate 23 disposed thereon. This is called a direct type backlight device. As shown in FIG. 1, a reflector 21a is provided in the tray 21, and the plurality of linear light sources 3 are positioned on the reflector 2la. Each linear light source 3 is arranged in parallel in the tray 21 at equal intervals, and is provided in a planar shape as a whole. On the other hand, the display panel 4 is a panel substrate constituted by a pair of glass substrates 42 each fitted in a frame 41, a pair of transparent electrodes interposed between them, and an alignment film containing liquid crystals. And 43.

As shown in FIG. 2, the linear light source 3 includes three fluorescent lamps 31, 32, 33 (each of which is a discharge lamp according to the present invention) surrounded by a glass wall 34 through which visible light can pass. These are intertwined so as to be twisted together and spiral It is formed by wrapping around. The fluorescent lamps 31, 32, and 33 are formed by cold cathode tubes, and a pair of internal electrodes 33b (only the fluorescent lamp 33 is shown in FIG. 3) are accommodated in each of the fluorescent lamps 31, 32, and 33. The terminal pins 3 la, 32a, 33a connected to are also protruding at both ends. By energizing the terminal pins 31a, 32a, and 33a, the light lamps 31, 32, and 33 can be individually powered! Argon containing mercury vapor is sealed inside the light lamps 31, 32, and 33, and phosphors 31c, 32c, and 33c that emit red, green, and blue light are respectively provided on the inner surface of the wall 34. It has been applied.

[0012] The linear light source 3 will be described in more detail. As shown in FIG. 4, the wall body 34 is integrally formed by a cylindrical outer peripheral wall 34a and a partition wall 34b that divides the inside of the wall body 34 in the circumferential direction. Are equally divided into fluorescent lamps 31, 32 and 33. The wall 34 is coated with phosphors 3 lc, 32c, and 33c that block ultraviolet rays at any part and emit light of a predetermined color on the inner surface. The wall 34 may be made of glass that cuts off ultraviolet rays in order to block out ultraviolet rays, or a layer that blocks ultraviolet rays or reflects ultraviolet rays between the glass and the phosphors 31c, 32c, and 33c. You may make it install. Each phosphor 31c, 32c, 33c may be applied only to the inner surface of the outer peripheral wall 34a as shown in FIG. 4, or the inner surface of the outer peripheral wall 34a and the partition wall 34b as shown in FIG. It may be applied (first modified example of the first embodiment), or may be applied only to the partition wall 34b as shown in FIG. 6 (second modified example of the first embodiment).

[0013] When a high voltage is applied between the internal electrodes via the terminal pins 31a, 32a, 33a to cause discharge, the emitted electrons are mercury enclosed in the fluorescent lamps 31, 32, 33. The phosphors 31c, 32c and 33c generate visible light of a predetermined color by colliding with electrons and generating ultraviolet rays. Light emitted from the fluorescent lamps 31, 32, and 33 reaches the display panel 4 directly or after being reflected by the reflecting plate 21 a and displays an image on the display panel 4. A desired image can be displayed on the display panel 4 by adjusting the amount of discharge of each of the fluorescent lamps 31, 32, and 33 to individually control the luminous intensity of each emission color.

[0014] According to the present embodiment, a plurality of fluorescent lamps that are long and are surrounded by a wall 34 that allows visible light to pass through, and are discharged between a pair of electrodes housed therein to emit light in a predetermined color. With multiple lamps 31, 32, 33, and different light colors, and these fluorescent lamps 31, 32, 33 are intertwined so that they twist together As a result, it is possible to obtain a linear light source 3 that can emit light of each color evenly and can eliminate uneven color. In addition, since the plurality of fluorescent lamps 31, 32, and 33 can be energized individually, the operation and light emission amount of each fluorescent lamp 31, 32, and 33 can be individually controlled. In addition, since the plurality of fluorescent lamps 31, 3 2, 33 are spirally wound around each other, the amount of light emitted from each color can be easily equalized on the surface of the light source 3.

[0015] The wall body 34 is integrally formed by a cylindrical outer peripheral wall 34a and a partition wall 34b that divides the inside in a circumferential direction, and includes a pair of electrodes in the partitioned interior. Therefore, the wall 34 can be formed at the same time, and the plurality of fluorescent lamps 31, 32, 33 can be integrated, and the linear light source 3 can be made small and low cost. The wall body 34 blocks ultraviolet rays and is coated with phosphors 31c, 32c, and 33c that emit light of a predetermined color on the inner surface, so that the ultraviolet rays are inside the other fluorescent lamps 31, 32, and 33. The desired color can be emitted accurately. Further, since the linear light source 3 includes the fluorescent lamps 31, 32, and 33, various colors of light can be emitted by selecting the phosphors 31c, 32c, and 33c. Further, since the fluorescent lamps 31, 32 and 33 are cold cathode fluorescent lamps, they are smaller than incandescent lamps or halogen lamps, and the luminous intensity with respect to power consumption can be improved.

[0016] In addition, since the linear light source 3 is used for the knocklight device 2, it is possible to provide an illumination device that can eliminate color unevenness. Further, since a device such as a drive source for rotating the linear light source 3 is not required, the size can be reduced. Further, since the knock light device 2 is a direct type backlight device in which the linear light source 3 is installed on the reflection plate 21a, it can be an illumination device with high brightness.

[0017] In addition, the liquid crystal display 1 is formed by installing a display panel 4 capable of displaying an image in front of the knocklight device 2, so that color unevenness can be eliminated without requiring a color filter or the like. A small display device that can easily form an image can be obtained. In addition, by adjusting the discharge amount of the fluorescent lamps 31, 32, and 33 to control the light intensity and form an image on the display panel 4, the light emission amount is controlled by the gradation on the panel 4 side. There is no need to control. Alternatively, add to the adjustment of the amount of light emitted by the gradation etc. on the panel 4 side. Moreover, finer and more powerful color adjustment can be performed by adjusting the luminous intensity of the linear light source 3.

Next, a third modification of the first embodiment will be described based on FIG. The linear light source 3A is called an external electrode fluorescent lamp, and, like the linear light source 3, is composed of three fluorescent lamps 35, 36, and 37 that are spirally wound around each other. Each of the fluorescent lamps 35, 36, and 37 contains a single linear internal electrode 37b (only the fluorescent lamp 37 is shown), and these, and the fluorescent lamps 35, 36, The force is electrically connected to the terminal pins 35a, 36a, and 37a protruding to one end side of 37 respectively.

In addition, a single linear external electrode 39 is spirally wound on the outer peripheral surface of the wall 38 of the linear light source 3A. The external electrode 39 is provided so as to be in contact with all the outer peripheral surfaces of the fluorescent lamps 35, 36 and 37, and a terminal 39a is formed at one end thereof, which is the low voltage side of the power source (not shown) of the backlight device 2. It is connected to the. As described above, the external electrode 39 functions as a low-voltage side electrode common to the fluorescent lamps 35, 36, and 37, and the fluorescent light is supplied by individually energizing the internal electrodes through the terminal pins 35a, 36a, and 37a. Lamps 35, 36 and 37 can be energized individually. When the fluorescent lamps 35, 36, and 37 are energized, electrons are emitted from the wall 38 to the inside. According to this modification, the lifetime of the linear light source 3A in which electrons are not directly emitted from the external electrode 39 can be extended.

Next, Embodiment 2 of the present invention will be described with reference to FIG. The linear light source 5 according to the present embodiment is formed by twisting and intertwining separate straight-tube fluorescent lamps 51, 52, and 53 and spirally winding them together. Each of the fluorescent lamps 51, 52, and 53 is formed to be long by being surrounded by a wall body 54 that transmits visible light but blocks ultraviolet rays. Terminal pins 51a, 52a, 53a that are electrically connected to the electrodes housed inside project from both ends of each fluorescent lamp 51, 52, 53, and can be individually energized. Emits red, green, and blue light when energized. Other configurations are the same as those of the fluorescent lamps 31, 32, and 33 of the first embodiment, and thus the description thereof is omitted.

Next, a modification of the second embodiment will be described based on FIG. As with the linear light source 5, the linear light source 5A is twisted and entangled with separate straight tube fluorescent lamps 55, 56, and 57. , They are formed by being wound in a spiral manner. The fluorescent lamps 55, 56, and 57 are external electrode fluorescent lamps, and are attached to both ends of the lamps so as to be in contact with the outer peripheral surface of the wall body 58, respectively, in the ring-shaped external electrodes 55b, 56b, 57b 1S. A cap 59 made of an insulating material such as a synthetic resin is provided so as to separate the external electrodes 55b, 56b, 57b from each other so that they do not conduct each other. You are Terminal pin 55a, 56a, 57a force S is connected to outer electrode 55b, 56b, 57b, and evenly connected between the pair of outer electrode 55b, 56b, 57b via terminal pin 55a, 56a, 57a. It can be energized further.

The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and are within the scope not departing from the gist other than the following. Various modifications can be made.

(1) If the linear light source 6 is formed by the two fluorescent lamps 61 and 62 that emit light of different colors surrounded by the wall 63, the color of the light within a predetermined range can be obtained only by the emission of two colors. The linear light source 6 can be easily controlled for toning (shown in FIG. 10).

(2) Provide only multiples of 3 such as 6 or 9 fluorescent lamps, among them, those that emit red light, those that emit green light, and those that emit blue light, All colors may be toned using the three colors of the video signal.

(3) Four or more fluorescent lamps 71, 72, 73, 74 surrounded by a wall body 75, and four or more different colors (for example, red light, green light, blue light and yellow light) If the light source emits light, the number of light sources more than the three colors of the video signal is used, and a linear light source 7 that can be easily toned in many colors can be obtained (shown in FIG. 11).

(4) If the fluorescent lamp is a hot cathode tube, the luminous intensity with respect to the power consumption can be further improved as compared with the cold cathode tube.

(5) A plurality of discharge lamps filled with gases that emit light of different colors may be used inside, and these may be entangled to form a linear light source.

(6) Sidelight type in which the linear light source 3 is installed at the end of a plate-shaped light guide 83 sandwiched between the reflector 82 and the plurality of optical sheets 84, and the light emission is multiply reflected by the light guide 83. Backlighting If the display panel 85 is installed in front of the display 81 and the display panel 85 is installed, the display panel 85 can be reduced in thickness, and the liquid crystal display 8 can be provided with a lighting device with a small temperature rise on the illumination surface (see FIG. 12). .

(7) In addition, a light guide 86 is provided behind the optical sheet 84, and the linear light source 3 is installed at the end of the light guide 86. In addition, a side light front light type liquid crystal display 8A may be configured by installing a reflector 82 (see FIG. 13).

(8) If an image is formed on a display panel by a field sequential color method in which lighting of a plurality of fluorescent lamps having different emission colors is sequentially switched, it is not necessary to subdivide the pixels. A display device with high resolution can be obtained. In addition, instead of sequentially switching the lighting of a plurality of fluorescent lamps having different emission colors, they may be appropriately selected and turned on according to the displayed image.

(9) The backlight device may be formed by a single linear light source.

(10) The backlight device may be formed by arranging a linear light source bent into a U-shape, W-shape, L-shape, or U-shape in a planar shape.

(11) The linear light sources 3A, 5, 5A, 6 and 7 shown in FIGS. 7 to 11 are applied to the liquid crystal displays 1, 8, and 8A shown in FIG. 1, FIG. 12, or FIG. May be.

Claims

The scope of the claims

[1] A plurality of discharge lamps that are long and surrounded by a wall that allows visible light to pass through, and are discharged between a pair of electrodes housed in the wall to emit light in a predetermined color,

A linear light source, wherein the plurality of discharge lamps emit light in different colors, and the plurality of discharge lamps are entangled so as to twist each other.

[2] Discharge that is formed long by being surrounded by a wall that allows visible light to pass, and at least one side of which is discharged between a pair of electrodes provided on the outer peripheral surface of the wall to emit light in a predetermined color. With multiple lamps,

[3] The linear light source according to claim 1 or claim 2, wherein the plurality of discharge lamps can be individually energized.

[4] The linear light source according to claim 3, wherein the plurality of discharge lamps are spirally wound around each other.

5. The linear light source according to claim 1, wherein two of the plurality of discharge lamps are provided.

[6] The plurality of discharge lamps are provided in multiples of 3, which emit red light.

5. The linear light source according to claim 4, comprising the same number of green light emitting elements and that emitting blue light.

7. The linear light source according to claim 1, wherein four or more of the plurality of discharge lamps are provided so as to emit light in four or more different colors.

[8] The wall body is integrally formed by a cylindrical outer peripheral wall and a partition wall that divides the inside in a circumferential direction, and the pair of electrodes is provided in the partitioned interior. The linear light source according to claim 1, characterized by the following.

[9] The linear light source according to claim 1 or claim 2, wherein the discharge lamp is a fluorescent lamp.

10. The linear light source according to claim 1 or 2, wherein the discharge lamp is a cold cathode tube.

11. The linear light source according to claim 1 or claim 2, wherein the discharge lamp is a hot cathode tube.

12. The linear shape according to claim 9, wherein the wall of the discharge lamp blocks ultraviolet rays and is coated with a phosphor that emits light of a predetermined color on its inner surface. Light source

[13] An illumination device for a display device, comprising the linear light source according to claim 1 or claim 2.

14. The linear light source is formed by being installed on a reflecting plate.

14. A lighting device for a display device according to item 13.

15. The display device illumination according to claim 13, wherein the linear light source is installed at an end portion of a plate-like light guide, and the emitted light is reflected on the light guide in multiple reflections. apparatus.

[16] A display device comprising a display panel capable of displaying an image in front of the display device illumination device according to [13].

[17] A display device, wherein a display panel capable of displaying an image is provided behind the illumination device for a display device according to claim 13.

18. The display device according to claim 16, wherein an image is formed on the display panel by adjusting a discharge amount of the discharge lamp to control a light intensity thereof.

19. The display device according to claim 16, wherein an image is formed on the display panel by sequentially switching lighting of the plurality of discharge lamps having different emission colors.