JP4450807B2 - Display device - Google Patents

Description

  The present invention relates to a display device that can effectively use a part of light emitted from a backlight device disposed on the back surface of a display panel such as a thin liquid crystal panel, in addition to backlight use.

  In recent years, various display devices have been put into practical use. A liquid crystal display device, which is a type of display device, is characterized by its small size, thinness, and low power consumption. In recent years, the display quality has been improved, replacing the conventional CRT. It is becoming popular as a display. Unlike a self-luminous device such as a PDP or SED, a liquid crystal display device needs to have a backlight device as a light source on the back surface of the liquid crystal panel.

Patent Document 1 includes a display device, a light-emitting tube, a reflector, a diffuser, a first light guide plate, a second light guide plate, and a cabinet. Light guided to the first light guide plate is guided to the second light guide plate. There has been disclosed an information processing apparatus configured to irradiate the front surface of light that has been emitted and further guided to a second light guide plate at a different angle from the display device from the lower part of the display unit. With this configuration, the keyboard can be illuminated using the light of the backlight device, and the keyboard key size, key shape, and key printing can be easily recognized even when the surroundings are dark. It is said that.
JP 2001-67145 A

  The backlight device disclosed in Patent Document 1 is a side-type backlight in which a light-emitting tube is disposed on a side portion of a backlight chassis. Originally, a light guide plate is used to guide light from the light-emitting tube to produce light. To take out. By the way, in a liquid crystal display device with a large display size, a direct type backlight in which a plurality of arc tubes are arranged in a row is used in order to allow a uniform amount of light to enter the display region. As shown in FIG. 5, the direct-type backlight device 100 is configured such that the lamp clip 120 is inserted into a through hole 110 a formed in the backlight chassis 110 and fixed to the backlight chassis 110, and the arc tube 130 is fixed by the lamp clip 120. Is configured to support (grip). When the technology disclosed in Patent Document 1 is applied to such a direct type backlight device, there is a possibility that luminance unevenness is caused by arranging the second light guide plate for extracting light.

  For example, as shown in FIG. 6, when the second light guide plate 140 is arranged on the right side of the backlight device 100 (FIG. 6A), a part of the right side light out of the light emitted from the arc tube 130. Is extracted not only in the direction of the front surface (that is, the liquid crystal panel) but also on the right side, so that the luminance BR of the right region R is lower than the luminance BL of the left region L (BL> BR). On the other hand, when the second light guide plate 140 is disposed on the left side of the backlight device 100 (FIG. 6B), a part of the left side light emitted from the arc tube 130 is a front surface (that is, a liquid crystal panel). Therefore, the luminance BL of the left region L is lower than the luminance BR of the right region R (BL <BR).

  As described above, the technique disclosed in Patent Document 1 is a technique suitable for a side-type backlight device, and when applied to a direct-type backlight device, the luminance varies depending on the display position, resulting in display unevenness. There is a quality problem that appears as

  Further, as shown in FIG. 5, the direct type backlight device 100 supports the tube portion of the arc tube 130 after fixing the lamp clip 120 to the backlight chassis 110. In order to suppress light loss, the lamp clip 120 is preferably a transparent member. However, when the lamp clip 120 is a transparent member, there is a problem that light leaks from the through hole 110a provided in the backlight chassis 110 (FIG. 5: arrow).

  The present invention has been made in view of such circumstances, and light leaked from a through hole provided in a backlight chassis through a lamp clip is guided to a front frame body so that the leaked light functions as a power lamp. An object of the present invention is to provide a display device that can effectively use the light leakage of the backlight device, such as improving the design by using the light leakage as a product design.

In the display device according to the present invention, a translucent lamp clip is inserted into a display panel and a through-hole formed in a backlight chassis disposed on the back of the display panel, and an arc tube is supported by the lamp clip. and in a display device and a backlight unit, out of the light emitted from the light emitting tube, the light leakage leaking to the outside of the backlight chassis through the legs of the lamp clip is inserted into the through-hole, the back The light chassis includes light guide means for guiding the back side and the side of the light chassis to emit light from a position different from the display panel.

In the present invention, among the light emitted from the light emitting tube lamp clip having a light-transmitting support, the backlight chassis through the legs of the lamp clip inserted into the through hole provided in the bar click Light chassis Light leaking out to the outside is guided from the back side and the side of the backlight chassis and emitted from a position different from the display panel. As a result, the light emitted from the backlight device is emitted to the display panel, which is the original purpose, and part of the light (light leakage) that inevitably leaks outside the backlight chassis is effectively used to emit light for other purposes. and realized without requiring a lighting circuit for a dedicated light source and the light source.

  The display device according to the present invention is characterized in that the light guide means is a cylindrical reflection member, and the light leakage is guided inside the cylinder of the reflection member.

  In the present invention, a reflecting member formed in a cylindrical shape is used as a light guiding means for guiding light leakage. In this case, the light leakage guides the inside of the reflecting member. Since the light leakage is guided while reflecting inside the cylinder of the reflecting member, the light leakage does not leak to the outside of the cylinder and the light leakage can be used efficiently.

  The display device according to the present invention is characterized in that the light guiding means is a total reflection member, and the light leakage is guided inside the total reflection member.

  In the present invention, a total reflection member is used as a light guiding means for guiding light leakage. In this case, the light leakage is guided inside the total reflection member. Since the light leakage is guided while reflecting the inside of the total reflection member, it does not leak to the outside of the total reflection member, and the light leakage can be used efficiently. Since a member such as an optical fiber is distributed as a total reflection member in the market, it can be easily used as a light guide means. Further, by appropriately bending the optical fiber, the light guide path can be freely designed, and the versatility is excellent.

  The display device according to the present invention is characterized in that power on / off is notified by the light guided by the light guide means.

  In the present invention, the user is notified of power on / off by the light guided by the light guiding means for guiding leakage light. Since the light leakage is turned on / off in synchronization with the on / off of the backlight device, it is possible to notify the user of power on / off by this turning on / off. Thus, the backlight device performs an additional function in addition to the original purpose of irradiating from the back surface of the display panel.

  The display device according to the present invention is characterized in that characters and / or patterns are formed by the light guided by the light guide means.

  In the present invention, light and light are used to form letters and / or patterns with light. Thereby, design nature improves and an attractive product can be provided to consumers. Since vision is the most affected sense among the five human senses, by forming letters and patterns on the surface of the display device, the image of the product can be enhanced, and the superiority over the competitive product can be seen by consumers. You can appeal to.

  The display device according to the present invention is further characterized in that the light guide means further has a function of selecting and guiding light of a specific frequency among the leaked light.

  In the present invention, light having a specific frequency in the light leakage is selected and guided, and the guided light is colored. Thereby, a color is added to a character and / or a pattern, and a more attractive product can be provided to consumers.

According to the present invention, among the light emitted from the light emitting tube, the light leaking to the outside of the backlight chassis through the legs of the insertion ramp clips into a through hole provided in the bar click light chassis of the backlight chassis by guiding the back surface side and side surface side, since the structure to be emitted from the different display panel position, the light emission of the light emitting tube, to effectively utilize the appropriate applications other than the backlight of the display device which is the original purpose be able to.

  According to the present invention, since the light guide means for guiding the light leakage is configured as the cylindrical reflection member, the light leakage is guided while being reflected inside the cylinder of the reflection member, and thus leaks to the outside of the cylinder. The light leakage can be used efficiently.

  According to the present invention, since the light guiding means for guiding light leakage is configured as a total reflection member, the light leakage is guided while reflecting the inside of the total reflection member, and thus leaks to the outside of the total reflection member. And light leakage can be used efficiently. Since a member such as an optical fiber is distributed as a total reflection member in the market, it can be easily used as a light guide means. Moreover, the optical fiber is excellent in versatility, and the light guide path can be freely designed by appropriately bending.

  According to the present invention, the light guided by the light guiding means that guides the leakage light is configured to notify the user of the power on / off, so that the power is supplied to the user in synchronization with the on / off of the backlight device. It is possible to notify the on / off status. In addition, since the inevitable backlight device is effectively used, a separate light source for notification and a lighting circuit for the light source are not required.

  According to the present invention, since light and light are guided to form a character and / or pattern with light, the design is improved and an attractive product can be provided to consumers. Since vision is the most affected sense among the five human senses, by forming letters and patterns on the surface of the display device, the image of the product can be enhanced, and the superiority over the competitive product can be seen by consumers. You can appeal to.

  According to the present invention, light having a specific frequency of light leakage is selected and guided, and the light is colored. Therefore, colors are added to characters and / or patterns, and a more attractive product is provided to consumers. It is possible to provide an excellent effect. Thus, the backlight device performs an additional function in addition to the original purpose of irradiating from the back surface of the display panel.

  Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.

  1 is a perspective view showing an external appearance of a liquid crystal display device according to an embodiment of the present invention, FIG. 2 is a side sectional view showing an internal configuration of the liquid crystal display device according to the embodiment of the present invention, and FIG. It is a principal part enlarged view. In addition, illustration of a stand etc. is abbreviate | omitted in FIG.

  The liquid crystal display device according to the embodiment of the present invention includes a liquid crystal panel 1 and a backlight device 2 provided on the back side of the liquid crystal panel 1, and the liquid crystal panel 1 and the backlight device 2 include the front cabinet 5 and the back surface. Arranged in the space formed by the cabinet 6. The front cabinet 5 is provided with an opening 5a, and an image is displayed through the opening 5a. The liquid crystal panel 1 and the backlight device 2 are fixed to a plate material (not shown), and a stand 7 is attached to the lower center of the plate material. Various circuits such as a power supply circuit, a drive circuit, and a lighting circuit (not shown) are disposed on the back side of the backlight device 2.

  A product logo display unit 51 and a power supply display unit 52 are turned on / off on the surface of the front cabinet 5. As will be described in detail later, the product logo display unit 51 and the power supply display unit 52 are turned on using light leakage leaked from the backlight device 2 (backlight chassis 21) to the outside. It is synchronized with the lighting of the light device 2.

  The liquid crystal panel 1 has a configuration in which a pair of transparent plates 11 and 12 are arranged to face each other, and a liquid crystal substance 14 is filled in a gap formed by sealing the peripheral portion of the transparent plates 11 and 12 with a sealing material 13 or the like. ing. Of course, it is preferable to use a spherical or columnar spacer to hold the gap with high accuracy. One transparent plate 11 is formed with a transparent pixel electrode such as ITO or NESA arranged in a matrix and a TFT for controlling the supply of electric charges to the pixel electrode. A transparent common electrode called a common electrode is formed in the. The gate and source of the TFT are connected to the output stages of the gate driver and source driver, respectively.

  Two polarizing plates 15 and 16 whose polarization axes are orthogonal to each other are attached to the surfaces of the transparent plates 11 and 12, and each pixel electrode is turned on / off by a gate signal input from a gate driver. The liquid crystal substance 14 is controlled based on the voltage difference between the voltage applied to the pixel electrode and the voltage applied to the counter electrode by applying a controlled data signal input from the source driver to each pixel electrode during the ON period. To control the light transmittance.

  In the liquid crystal panel 1 as described above, the front and back peripheral portions of the liquid crystal panel 1 are sandwiched between two sandwiching members 17 and 18, and one sandwiching member 17 is secured to the backlight device 2 (backlight chassis 21) with screws or the like. The relative position between the liquid crystal panel 1 and the backlight device 2 is prevented from changing.

  In the backlight device 2, a reflection sheet 22 is disposed on the inner surface of a rectangular parallelepiped backlight chassis 21 whose front surface is opened. The reflection sheet 22 is made of a material having excellent light reflectivity, such as aluminum, and reflects light emitted from a cold cathode ray discharge tube (CCFL) 35 described later to the front surface.

  In addition, the backlight chassis 21 has a stepped portion 21a on the opening side of the side wall. On the stepped portion 21a, a diffusion plate 23 and an optical sheet 24 having substantially the same size are arranged, and a frame body 25 having an opening smaller than the area of the diffusion plate 23 and the optical sheet 24 is arranged from the upper side. Is attached to the backlight chassis 21 with screws or the like.

The backlight chassis 21 has a plurality of through holes 21b are formed, the lamp clip 30, the legs of each are fixed by inserting into each other through holes 21b. In this example, since the lamp clip 30 is inserted from the upper side of the reflection sheet 22, the reflection sheet 22 is provided with a through hole at a position overlapping the through hole 21b.

The lamp clip 30 supports straight tube portions of a plurality of linear CCFLs 35 serving as light sources arranged substantially in parallel. The lamp clip 30 is made of a material having excellent translucency, such as acrylic, and part of the light emitted from the CCFL 35 passes through the through hole 21b , more specifically, through the leg of the lamp clip 30 inserted into the through hole 21b. Leaks outside the backlight chassis 21.

  On the back and side surfaces of the backlight chassis 21, light guide members 40 that guide light leaked to the outside of the backlight chassis 21 through the through holes 21b to the front cabinet 5 serving as a front frame body are disposed. Note that the shape of the light guide member 40 is appropriately designed according to the position where light leakage is to be guided.

  The light guide member 40 is obtained by coating the surface of a material having excellent translucency, such as acrylic, with a reflective material. For example, as shown in FIG. 3, the front cabinet 5 is processed so that characters and patterns such as the product logo display unit 51 and the power supply display unit 52 become a blank pattern, and the acrylic member 41 is inserted into the blank pattern. At the same time, it is brought into contact with the leg portion of the lamp clip 30 protruding from the through hole 21 b of the backlight chassis 21. The acrylic member 41 is designed in advance so as to match the punching pattern processed in the front cabinet 5. The surface of the acrylic member 41 is coated with a reflective film 42 such as aluminum so that light leaked to the outside of the backlight chassis 21 through the through-hole 21b guides the inside of the acrylic member 41.

  That is, the reflection film 42 functions as a light guide unit that guides light leakage, and the light leakage is guided while reflecting inside the cylinder formed by the reflection film 42 (that is, inside the acrylic member 41). Leakage light can be used efficiently. In addition, the acrylic member 41 should just have translucency, and may be colorless and transparent. Originally, the CCFL 35 emits white light, so that even if the acrylic member 41 is colorless and transparent, characters and patterns are formed with white light. Further, from the viewpoint of design, a colored product may be used to select and guide light having a specific frequency in the leaked light, so that the product is rich in color. The amount of light guided can be adjusted by the number of lamp clips 30 with which the light guide member 40 is brought into contact.

As described above in detail, the present invention provides the direct-type backlight device, through the legs of the lamp clip 30 inserted into the through hole 21b provided in the server click light chassis 21, leaking to the back of the backlight chassis 21 The purpose is to guide light so as to be emitted from a position different from that of the display panel (liquid crystal panel 1). For example, by guiding light leakage to the front surface, it is possible to improve the design and provide an attractive product to the consumer. Since vision is the most affected sense among the five human senses, it is possible to enhance the image of the product by forming letters and patterns with the light including the product name on the surface, and superiority over competitive products Can appeal to consumers.

  In addition, by using the light guided to the front as the power display unit 52, it is not necessary to notify the user of power on / off of the liquid crystal display device using a light source such as an LED. The power supply display section 52 in this example is turned on / off in synchronization with the operation (on / off) of the backlight device 2.

  As described above, the backlight device 2 according to the present invention effectively utilizes the light leaking to the back surface of the backlight chassis 21, which is a conventional problem, in addition to the original purpose of irradiating the back surface of the liquid crystal panel 1. Can be used for additional purposes. In addition, since the light leakage of the backlight device 2 is used, the power consumption does not increase and, conversely, a light source such as a power lamp (LED) is unnecessary, so that the power consumption can be reduced. Of course, a lighting circuit for lighting the light source is also unnecessary.

  In the present embodiment, the embodiment using the reflection member (reflection film 42) formed in a cylindrical shape as the light guide means for guiding light leakage has been described. However, the total reflection member such as an optical fiber is used as the light guide means. The light leakage may be guided inside the total reflection member and guided to the front cabinet 5 as a front frame. For example, the optical fiber as the total reflection member is brought into contact with the leg portion of the lamp clip 30 protruding from the through hole 21 b of the backlight chassis 21, and the optical fiber is routed to the positions of the product logo display unit 51 and the power supply display unit 52.

  In this case, the optical fiber functions as a light guiding means for guiding leakage light, and the leakage light is guided to the position of the product logo display unit 51 and the power supply display unit 52 while reflecting the inside of the optical fiber. The light leakage can be used efficiently without leaking to the outside. The optical fiber may be a general-purpose product distributed in the market, and the light guide path can be freely designed by appropriately bending the optical fiber.

In addition, if the shape of the acrylic member is designed in consideration of the light guide path, the acrylic member may not be coated with a reflective film. For example, as shown in FIG. 4, the lamp clip 30 in the optical pickup position 45, the light guide path Z ₁ is the shape of the acrylic member 41 so that it can guide the light reflected by the surface of the acrylic member 41 to the left decide. Further, at the bent position 46 of the light guide path, the shape of the acrylic member 41 is determined so that the light guide path Z ₂ is reflected by the surface of the acrylic member 41 and can guide light upward. By doing so, it is possible to prevent light from leaking to the outside of the acrylic member 41. Therefore, the light leakage can be efficiently guided to the target direction and position without coating the surface of the acrylic member 41 with a reflective film. Can be made.

  Moreover, although the form which used the light leakage from the backlight chassis 21 effectively in the product logo display part 51 and the power supply display part 52 was demonstrated, of course, it is not limited to this, If it is those skilled in the art, Various changes or improvements can be added to the configurations and functions of the invention according to the above-described embodiments without departing from the gist of the present invention.

It is a perspective view which shows the external appearance of the liquid crystal display device of embodiment which concerns on this invention. It is a sectional side view which shows the internal structure of the liquid crystal display device of embodiment which concerns on this invention. It is a principal part enlarged view of FIG. It is sectional drawing which shows an example of the shape of a light guide member. It is sectional drawing which shows the structure of the conventional direct type | mold backlight apparatus. It is explanatory drawing for demonstrating a problem at the time of applying the technique currently disclosed by patent document 1 to a direct type | mold backlight apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal panel 2 Backlight apparatus 5 Front cabinet 6 Rear cabinet 21 Backlight chassis 21b Through-hole 30 Lamp clip 35 CCFL
40 Light guide member 41 Acrylic member 42 Reflective film 51 Product logo display part 52 Power supply display part

Claims (6)

A display comprising: a display panel; and a backlight device in which a translucent lamp clip is inserted into a through-hole formed in a backlight chassis disposed on the back surface of the display panel, and an arc tube is supported by the lamp clip. In the device
Of the light emitted from the light emitting tube, the light leakage leaking to the outside of the backlight chassis through the legs of the lamp clip is inserted into the through hole, guiding the back surface side and side surface side of the backlight chassis And a light guide means for emitting light from a position different from that of the display panel. The light guiding means is a cylindrical reflecting member,
The display device according to claim 1, wherein the light leakage is guided inside a cylinder of the reflecting member. The light guide means is a total reflection member,
The display device according to claim 1, wherein the light leakage is guided inside the total reflection member. The display device according to any one of claims 1 to 3, wherein the light guided by the light guiding unit is notified of power on / off. The display device according to claim 1, wherein characters and / or patterns are formed by the light guided by the light guide unit. The display device according to any one of claims 1 to 5, wherein the light guide unit has a function of selecting and guiding light of a specific frequency among the leaked light.

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