JP2007225695A - Image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-profile image display device of narrow frame with a mark of light emission-type arranged therein with proper balance near a display image. <P>SOLUTION: The mark is arranged in a position concealing the matrix wiring and FPC of an image display panel and a structure for illuminating the mark is housed on the front surface side, or within the side face side of the image display panel. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an image display device in the field of household and industrial electronic devices.

  Various proposals have been made for technologies for recognizing human eyes by using internal lighting, such as letters and figures formed on the surface of equipment, and marks such as trademarks, and various products are on the market. A typical configuration will be described.

  FIG. 10 is a cross-sectional view of the display device disclosed in Patent Document 1. In FIG. 61 is a housing, 62 is a compartment, 63 is a light source, 64 is a color lens mounted in the opening of the compartment 62, 65 is a light transmissive light guide plate, and 66 is a light diffusion portion formed on the surface of the light guide plate 65 , 67 is a dial plate on which a mark is formed, 68 is a light-shielding black print portion formed on the dial plate, and 69 is a print-out portion that forms a character or shape of the mark.

  In the above configuration, the light from the light source 63 first passes through the color lens 64 and passes through the light guide plate 65 as a transmitted light of a specific hue, and becomes diffused light in the light diffusion portion 66 behind the dial 67. Illuminate from. Then, the light is radiated to the outside through the printed part 69 representing the mark, so that the mark can be confirmed with human eyes.

  FIG. 11 is a cross-sectional view of a thin video display device disclosed in Patent Document 2. 71 is the edge of the area where the image of the front panel made of transparent resin is displayed, 72 is the indicator panel for the extension of the front panel, 73 is the operation input unit with the power switch and adjustment switch functions, light-shielding characters and figures , 74 is an inclined surface concaved on the indicator panel 72, and 75 is a light source.

In the above configuration, the light from the light source 75 is incident from the side surface of the indicator panel 72, is reflected forward by the inclined surface 74, and passes through the light transmitting portion of the operation input unit, so that the characters and figures are confirmed by human eyes. it can. In a bright room, the light source is not turned on, and characters and figures are viewed with reflected light. When it is dark, it is illuminated with the light source described above.
Japanese Unexamined Patent Publication No. 08-160890 JP 2005-267897

  FIG. 6 is a front view showing the logo position of the thin image display device, and partially cutting the exterior so that the internal image display module can be seen. 50 is a front frame made of an aluminum alloy that covers the front side of the internal image display module, 51 is a glass front plate attached to the opening of the front frame 50, and black ceramic printing is applied to the frame shape, 52 Is the image display area of the front plate 51 and has a visible light transmittance of about 80% and the surface is anti-reflective. 53 is the light that is printed on the frame-like black printing part of the front plate 51 in a logo shape. It is a transmission part. Reference numeral 54 denotes a face plate (hereinafter referred to as FP) of the image display module, and a conductive treatment film and RGB fluorescent films are applied on the inner side of the glass substrate. 55 is a rear plate (hereinafter referred to as RP) which is arranged so as to be opposed to the back side of the FP to form a vacuum vessel, and is an electron-emitting device for displaying an image on a glass substrate on the FP 54 side. In addition, matrix wirings connected from the periphery are formed. Reference numeral 56 denotes an X-direction FPC for transmitting an electric drive signal (scanning signal) for image display to the electron-emitting device of the RP55, and is connected to the end portion through an anisotropic conductive tape. Reference numeral 57 denotes a Y-direction FPC for transmitting an electric drive signal for image display to the electron-emitting device of the RP55, and is connected to the end portion through an anisotropic conductive tape. 58 represents a wall around the front frame 50.

  In the above configuration, the black wiring portion of the front plate 50 is provided to hide the matrix wiring and the FPCs 56 and 57 around the RP 55, and when the image display device is viewed from the front, the position of the logo 53 is the image display region 52. The center of the black printed portion of the front plate 50 is stable and optimal. However, this part is a narrow space with a space of only about 8mm with the FP54 facing each other. In addition, since the frame width of the image display device is preferably commercially narrow, the space between the Y-direction FPC and the surrounding wall 58 is also a narrow space of only about 10 mm. When considering to illuminate the illumination structure of the previous logo 53 in this portion, the conventional configuration has the following problems.

  1. The configuration disclosed in Japanese Patent Application Laid-Open No. 08-160890 has a large depth dimension and cannot be stored in the space formed by the front plate 51 and the FP54.

  2. In the configuration disclosed in Japanese Patent Laid-Open No. 2005-267897, the portion that houses the light source interferes with the front frame 50 and cannot be arranged.

  3. In the configuration disclosed in Japanese Patent Laid-Open No. 2005-267897, the light emitted from the light source leaks into the image display area, so that the contrast of the displayed image decreases when the position of the logo 53 is brought close to the image display area 52.

  4). Since the front plate 51 of the present image display device is made of glass, it is difficult to form a slope with a concave surface as in the configuration disclosed in JP-A-2005-267897. The reason why the front plate 51 of the image display device is made of glass is that it has strength to protect the internal image display module and has little deflection with respect to external pressure.

  5. In the illumination method of characters and figures disclosed in Japanese Patent Laid-Open No. 08-160890 and Japanese Patent Laid-Open No. 2005-267897, the black printed portion of the front plate 51 is ceramic printed, so the light cannot be completely blocked, and the periphery of the logo 53 is It is faint and unsightly. The reason why the black printing on the front plate 51 of the present image display device is ceramic is that the adhesiveness of the coating film to the glass surface is taken into consideration.

  6). The lighting operation of characters and figures disclosed in Japanese Patent Application Laid-Open No. 2005-267897 is automated and convenient to turn on when it is dark and turn off when it is bright, but as in this case, the logo 53 is near the image display area 52. Because it is located, depending on the conditions, the logo is too conspicuous and the screen is difficult to see.

In the first embodiment of the present invention,
(1) A light-emitting logo is placed on the front of the image display unit, at a position where the matrix wiring or FPC is concealed, and a thin light guide for illuminating the logo is placed in close contact with the front plate and the front frame vertical wall. The light source was arranged at the corner where the vertical wall and the horizontal wall of the front frame cross each other, the LED circuit board was brought into close contact with the horizontal surface of the front frame, and the light guide and the LED circuit board were arranged in a substantially L shape.

(2) Since the light incident from the lower part of the light guide passes through the bent part and illuminates the logo,
A fine uneven shape by grain molding was provided on the surface of the light guide opposite to the logo.

  (3) A light-shielding coating is applied to the portion facing the FP ahead of the bent portion of the light guide to prevent light leakage.

  (4) At the upper end of the light guide on the side opposite to the light source, a slanted reflecting portion is formed to return light, and the surface of the reflecting portion and the bent portion is white-coated.

  (5) The light guide light emitting part was widened with respect to the logo, and the outline of the light emitting part was concealed with a light-shielding sheet having an opening in the logo region.

  (6) An LED circuit board for illuminating the logo is provided with a three-stage brightness adjustment circuit, and a signal for switching the brightness adjustment circuit corresponding to the power consumption is output from the control board.

In the second embodiment of the present invention,
(1) A light emitting logo is placed on the front of the image display unit, at a position where the matrix wiring or FPC is concealed, and the organic EL unit for illuminating the logo is brought into close contact with the front plate in the space in front of the image display module. The drive circuit board was disposed on the horizontal plane of the front frame in the space at the bottom of the image display module.

  (2) A back light leakage prevention type organic EL unit was adopted, and it was housed in a package that closed the entire circumference.

  (3) The light emitting area of the organic EL unit was widened with respect to the logo, and the outline of the light emitting area of the organic EL unit was concealed with a light-shielding sheet having an opening in the logo area.

  (4) A three-stage luminance adjustment circuit is included in the organic EL driving circuit board for shining the logo, and a signal for switching the luminance adjustment circuit corresponding to the power consumption is output from the control board.

According to a first embodiment of the invention,
(1) Since the logo illumination structure can be divided and stored in a narrow space on the front and side of the image display module, a thin and narrow frame image display device can be realized. (2) Light that has passed through the light guide is diffused in the logo direction. (3) Light leakage from the light guide to the image display area has been eliminated, so the logo can be approached to the image display area. (4) Light transmission through the light guide Increased efficiency, increased logo brightness or reduced power consumption of the light source (5) Eliminating uneven brightness of the logo and eliminating the phenomenon of faint shining around the logo (6) Brightness of the displayed image Since the logo brightness changes correspondingly, the logo display can be optimized without being noticeable. According to the second embodiment of the present invention,
(1) Since the logo illumination structure can be stored separately in a narrow space on the front and side of the image display module, a thin and narrow frame image display device can be realized. (2) Light leakage from the organic EL unit to the image display unit Since it has been resolved, the logo can be moved closer to the image display area. (3) The brightness unevenness of the logo has been eliminated, and the phenomenon that the periphery of the logo shines has been eliminated. (4) The logo corresponds to the brightness of the displayed image. Because the brightness of the logo changes, the logo display is not noticeable and can be optimized

  Next, details of the present invention will be described in accordance with the description of the embodiments.

  FIG. 1 is a longitudinal sectional view of the bottom of the housing of the thin image display device of the present invention, and FIG. 2 is a plan view seen from the back side of the bottom of the housing with the image display module removed. Reference numeral 1 denotes a face plate (hereinafter referred to as FP) of an image display module. A conductive treatment film and RGB fluorescent films are applied to the inside of a glass substrate, and a high voltage of several tens of Kv is supplied to the conductive treatment film. It has a structure (not shown). Reference numeral 2 denotes a rear plate (hereinafter referred to as RP) which is arranged several mm apart so as to face the FP1, and an electron-emitting device 3 for displaying an image on the glass substrate on the FP1 surface side and the periphery thereof Matrix wiring 4 that is electrically connected is formed. Reference numeral 5 denotes a frame member that is arranged in a frame shape between the FP1 and the RP2 and joins them to form a vacuum vessel. Reference numeral 6 denotes a vacuum region formed by the FP1, RP2 and the frame member 5. Although not shown in the drawing, a plurality of support members called spacers are arranged inside the vacuum vessel in order to prevent the vacuum vessel from being crushed by atmospheric pressure. Yes. Reference numeral 7 denotes a chassis for holding the vacuum container on the back side opposite to the image display, which realizes rigidity and measurement by combining an aluminum alloy plate material and an extruded material. It also has a structure that supports Reference numeral 8 denotes a Y-direction FPC for transmitting an electric drive signal for image display to the matrix wiring 4 of the RP 2 and is connected to the end of the matrix wiring 4 through an anisotropic conductive tape. Reference numeral 9 denotes a Y driver board having a circuit for connecting an electrical drive signal for image display by connecting to the Y-direction FPC 8 and is mounted on the chassis 7. The control board and the drive power supply board are also electrically connected. Reference numeral 10 denotes a front frame which protects the internal image display module and has an appearance, and is made of aluminum alloy members assembled into a frame shape. 10a is a first light guide positioning in which two projections are formed from the vertical surface of the inner wall of the front frame 10, and 10b is a second light guide positioning which is also a horizontal surface of the inner wall of the front frame 10. 10c is an LED circuit positioning which is also a vertical surface of the inner wall of the front frame 10, and 11 is a front plate bonded to the front side of the opening of the front frame 10 with double-sided tape, protecting the image display module and improving the appearance. It is made of glass and has a low reflection treatment on the surface, and a frame-shaped black ceramic print 12 is formed on the surface on the image display module side. Reference numeral 13 denotes a logo portion that can recognize characters of a mark such as a trademark by not printing a part of the black ceramic print 12. 14 is a light guide formed by processing a transparent acrylic resin, and is a member for illuminating the logo portion 13 from the back side. Further, 14a is a diffusion processing surface for diffusing and reflecting the light guided by the light guide 14 to illuminate the previous logo portion 13 with a more uniform luminance, and 14b is a shape straddling the front frame 10 and the front plate 11. It is the bending part of the light guide body bent along. Reference numeral 14c denotes a light incident portion for entering light of a light source, which will be described later, into the light guide 14, and has a smooth mirror finish for efficient introduction. Reference numeral 14d denotes a light emitting portion for light that has traveled in the light guide 14 that is substantially in close contact with the logo portion 13, and is a transparent smooth surface that easily transmits light. In addition, the light guide 14 is reflected on the surface thereof by white printing to improve the reflectance, and the surface of the portion where the light wraps around the image display portion is light-shielded. Reference numeral 14e denotes a vertical positioning portion protruding from the lower end of the light guide, hitting the second light guide positioning 10b of the front frame, and 14f consisting of vertical surfaces of left and right protrusions protruding from the lower end of the light guide. It is a holder positioning part. A light-shielding sheet 15 is attached to the surface of the black ceramic print 12 on the front plate so as to surround the periphery of the logo portion 13, and an adhesive material is laminated on a thin aluminum metal foil. Reference numeral 16 denotes a light source disposed substantially in close contact with the light incident portion 14 c of the light guide 14, and a plurality of white LEDs are arranged so as to match the width of the logo portion 13. Reference numeral 17 denotes an LED circuit board for supplying electricity by soldering the light source 16. 18a is a power cable for supplying current from the power source to the LED circuit board 17, and is connected to the LED circuit board 17 by a connector, and 18b inputs a signal from the control board to the LED circuit board 17. And is connected to the LED circuit board 17 by a connector. Reference numeral 19 denotes a fixing member for mechanically fixing the LED circuit board 17 and is made of an electrically insulating material. Reference numeral 20 denotes a resin molded product which is a holder for positioning the LED circuit board 17 and ensuring insulation with the metal (conductive) front frame 10. Reference numeral 20a denotes two floating prevention portions for sandwiching the holder 20 between the light incident portion 14c of the light guide and the vertical positioning portion 14e of the front frame when the holder 20 is assembled. It is the latching nail | claw arrange | positioned in the right and left in order to fix to a vertical direction. Reference numeral 21 denotes light emitted from the light source 16 from the light incident portion of the light guide 14, travels while reflecting inside, diffuses on the diffusion processing surface 14 a, changes its direction, and then changes the direction from the light emitting portion 14 d to the logo portion of the front plate 11. Illumination trajectory passing through 13 is shown. Reference numeral 22 denotes an electron trajectory that is emitted from the electron-emitting device 3 formed on RP2 and collides with the conductive treatment film formed on FP1. Reference numeral 23 denotes a display light beam that travels through an image display area in which an RGB phosphor film emits light and displays an image due to the collision of electrons.

  3 and 4 are enlarged front views showing the overlapping positions of the respective parts so that the features constituting the logo portion 13 of the thin image display device of the present invention can be understood, and the same configurations as those in FIGS. 1 and 2 are the same. A number is assigned and description is omitted. 14g shows the external shape of the light guide 14, and is represented by a broken line, and 14d represents the range of the light emitting portion of the light guide 14 described above by a solid line. 15a indicates the outer shape of the light shielding sheet 15 and is represented by a broken line, and 15b similarly represents an opening range through which light of the light shielding sheet 15 can pass and is represented by a broken line.

  A feature of the present invention in the above configuration, a method for assembling the structure for shining the logo will be described (the assembly of the image display module is omitted).

  A front plate formed with the black ceramic printing 12 to form the logo portion 13 is bonded to the front surface of the opening portion of the front frame 10 having a frame shape by using a double-sided tape (not shown). Next, the light shielding sheet 15 is bonded to the position shown in FIG. 3 so that the logo portion 13 is not hidden. Next, a double-sided tape (not shown) surrounding the light emitting portion 14d of the light guide 14 in a frame shape is adhered, and the light guide 14 is adhered to the light shielding sheet 15 of the logo portion 13 described above. . At this time, the light guide 14 is positioned in the right and left side portions of the light guide 14 on the left and right sides of the first light guide body 10a of the front frame 10, and in the vertical direction on the top and bottom positioning portions 14e of the front frame 10. It abuts on the positioning 10b. Thus, the position of the light emitting portion 14d of the light guide 14 with respect to the logo portion 13 is fixed and fixed.

  Next, the light source 16 is attached. After the LED circuit board 17 on which the light source 16 and the connectors are mounted is accommodated by bending the locking claw 20b of the holder 20, it is inserted forward along the horizontal plane of the inner wall of the front frame 10 from the back direction, and further guided. While the left and right end portions of the holder 20 are aligned inside the left and right holder positioning portions 14f of the light body 14, the light body 14 abuts against the LED circuit positioning 10c on the vertical surface of the inner wall of the front frame 10. Next, the fixing member 19 is pressed against the LED circuit board 17 from the back side, and is fixed to the front frame 10 using screws (not shown). Thereafter, the power cable 18a and the control cable 18b are connected to the respective connectors of the LED circuit board 17, and the assembling work is completed.

  Next, the characteristic features of the present invention will be explained. (1) Displaying a light-emitting logo at a position where the matrix wiring or FPC of the image display section is concealed: In the image display device of the present invention, as shown in FIG. The upper end of the logo portion 13 is located at the top, and the main members such as the light guide 14, the light source 16 and the LED circuit board 17 which are structures for illuminating the logo portion 13 are combined. Further, although not shown in the drawing, a portion facing the FP 1 ahead of the bent portion of the light guide 14 is applied with a light shielding coating to prevent a decrease in contrast of the display light beam 23 due to light leakage. In order to realize a thin and narrow frame appearance, it has the following features. (2) The light source 16 is arranged at the corner where the vertical wall and the horizontal wall of the front frame 10 intersect, and the thin light guide 14 and the LED circuit board 17 are arranged in an approximately L shape: guided as shown in FIG. The light body 14 has an average thickness of 2.5 mm, and has a bent portion 14 b for extending along the front frame 10 and the front plate 11 in the middle. There is a device to return. A white coating (not shown) is applied to the surfaces of the reflecting portion and the bent portion 14 b of the light guide body 14. On the other hand, the LED circuit board 17 on which the light source 16 is mounted is fixed to the horizontal surface of the front frame 10 by the holder 20 and the fixing member 19. (3) Surface shape that realizes bending of light emission angle and light diffusion at low cost: Surface on the FP1 side of the light guide 14 facing the logo portion 13 by bending and diffusing the angle of light from the light source Provided. The treatment is an inexpensive method in which a fine unevenness (wrinkle) shape is formed on the mold by etching and the light guide 14 is integrally processed by injection molding. (4) Light-shielding sheet that clearly shows the letters on the ceramic print: In order to illuminate the characters on the logo portion 13 with transmitted light, the shape of the light emitting portion 14d of the light guide may be the same as that of the logo portion 13. However, it is difficult for mass production to produce the output portion 14d in the form of a fine character Candy as in the present case and to overlap the logo portion 13 unless the positional accuracy is obtained. Therefore, as shown in FIG. 4, by providing the light emitting portion 14d in a wide range with respect to the logo portion 13, the characters (logo portion 13) are not collapsed and the luminance unevenness is also eliminated. However, since the black ceramic print 12 around the logo portion 13 transmits light slightly, when the logo portion 13 is observed from the front in an illuminated state, the outline of the light emitting portion 14d (rounded corners) around the brightly illuminated character. It is a problem in appearance because it can be recognized slightly. However, this problem is solved when the outer shape line of the light emitting portion 14d is covered with the light shielding sheet 15. Strictly speaking, the opening range 15b of the light shielding sheet around the logo portion 13 should be slightly shining, but since it is in the immediate vicinity of the brightly shining logo portion 13, this slight light cannot be confirmed with the naked eye. It doesn't matter.

  (5) Light source controlled to an appropriate illuminance that does not disturb the screen: a mark such as a trademark, in this case, the purpose of shining the Candy logo 13 is to produce a high-quality product. Since the logo portion 13 of the present invention is close to the image display area, it has the disadvantage that it becomes difficult to see the displayed image if it is too conspicuous. The LED circuit board 17 includes a circuit (not shown) that can adjust the brightness in three stages, and further selects the circuit that can be adjusted by a signal from the control board. Further, the control board sets the power consumption value of the power supply in advance. The selection signal of the circuit is output in comparison with the obtained value. That is, the luminance of the light source 16 is low / middle / high, that is, low, as shown in FIG. 5, by switching the three-stage luminance adjustment circuit of the LED circuit board 17 according to the power consumption (corresponding to the luminance of the display screen). / Medium / High could be changed.

  FIG. 7 is a longitudinal sectional view of the bottom of the housing of the thin image display device according to the second embodiment of the present invention, and FIG. 8 is a plan view seen from the back side of the housing bottom with the image display module removed. 9 is an enlarged front view showing the overlapping position of each component so that the features constituting the logo portion 13 can be understood. A description of the same functions and configurations as those of the first embodiment will be omitted. Reference numeral 30 denotes an organic EL unit that has a property of emitting light when a voltage is applied. After an electron transport layer and a hole transport layer are stacked on the back side reflective electrode to which the voltage is applied, the other transparent electrode to which the voltage is applied is provided. It has a sandwiched structure, and an input connector for supplying electricity is provided on the back side. Reference numeral 30 a denotes a light emitting region of the organic EL unit 30. Reference numeral 31 denotes an output cable for supplying electricity to the organic EL unit 30, and extends downward between the front plate 11 and the image display module. Reference numeral 32 denotes an organic EL driving circuit board for supplying electricity to the organic EL unit 30 and includes a circuit for stabilizing the light emission of the organic EL unit 30 and a luminance adjusting circuit capable of changing the luminance in three stages. . An output connector 33 is soldered to the organic EL drive circuit board 32 and is mechanically and electrically connected to the previous output cable 31. Reference numeral 34 denotes a front frame which protects the internal image display module and has an appearance, and is made of aluminum alloy members assembled into a frame shape. 34a is a holder positioning formed at the lower corner of the vertical surface of the inner wall of the front frame 34, and has a groove shape for inserting a holder to be described later. Reference numeral 35 denotes a fixing member that is fixed to the front frame by screws (not shown) at a position where it is in close contact with the back side of the organic EL drive circuit board 32 and supported. Reference numeral 36 denotes an illumination light beam in which light emitted from the organic EL unit 30 as a light source passes through the logo portion 13 of the front plate 11. Reference numeral 37 denotes a holder that accommodates and supports the organic EL drive circuit board 32 and fits into the holder positioning 34a of the front frame 34. 37a is arranged on the left and right to fix the organic EL drive circuit board 32 in the vertical direction. It is a latching claw.

  A feature of the present invention in the above configuration, a method for assembling the structure for shining the logo will be described (the assembly of the image display module is omitted).

  A front plate formed with the black ceramic printing 12 in advance to form the logo portion 13 is bonded to the front surface of the opening portion of the front frame 34 having a frame shape by using a double-sided tape (not shown). Next, the light shielding sheet 15 is bonded to the position shown in FIG. 3 so that the logo portion 13 is not hidden. Next, the organic EL unit 30 in which a frame-like double-sided tape (not shown) is bonded to the peripheral portion in advance on the light emitting surface side is superposed on and adhered to the light shielding sheet 15 of the logo portion 13 described above. At this time, the positioning method of the organic EL element 30 is adjusted so that the opening range 15b of the light shielding sheet is within the light emitting region 30a of the organic EL unit and the organic EL unit 30 does not protrude the outer shape 15a of the light shielding sheet. With the above operation, the position of the organic EL unit 30 with respect to the logo portion 13 is fixed and fixed. Next, the organic EL drive circuit board 32 is attached. After the organic EL driving circuit board 32 on which the connectors are mounted is accommodated by bending the locking claws 37a of the holder, the holder 37 is inserted forward along the horizontal plane of the inner wall of the front frame 34 from the back side. Further, the holder 37 is inserted and abutted along the left and right ends of the holder 37 so as to be fitted to the holder positioning 34a of the front frame. Next, the fixing member 35 is pressed against the organic EL drive circuit board 32 from the back direction, and the front frame 34 is fixed using screws (not shown). Thereafter, one of the connectors attached to both ends of the output cable 31 is connected to the connector on the back surface of the organic EL element 30, and the other is connected to the output connector 33 on the organic EL drive circuit board 32. Finally, the power cable 18a and the control cable 18b are connected to the respective connectors of the organic EL drive circuit board 32, and the assembling work is completed.

  Next, the characteristic features of the present invention will be explained. (1) Displaying a light-emitting logo at a position where the matrix wiring or FPC of the image display unit is concealed: In the image display device of the present invention, as shown in FIG. The upper end of the logo portion 13 is located at the top, and main components such as an organic EL unit 30, an output cable 31, and an organic EL drive circuit board 32 that are structures for illuminating the logo portion 13 are combined. In order to realize a thin and narrow frame appearance, it has the following features. (2) The main member is stored in two spaces: the thin and wide organic EL element 30 is stored in the space in front of the front plate 11 and the image display module, and the organic EL drive circuit board 32 is in the horizontal plane of the front frame 34. And stored in the space on the side of the image display module. In order to prevent light leakage to the screen, (3) Adopting a back light leakage prevention type organic EL unit: Although not shown in the figure, the back side electrode to which the voltage of the organic EL unit 30 is applied is an opaque reflection type, In addition, since it is housed in a package (not shown) that covers the entire periphery of the side surface, the contrast of the display light beam 23 is prevented from lowering due to light leakage. (4) Light-shielding sheet that clearly shows the letters printed on the ceramic print: In order to illuminate the letters on the logo part 13 with transmitted light, the light emitting area 30a of the organic EL unit may be manufactured in the same shape as the logo part 13. As in this case, it is difficult to produce the shape of the detailed character Candy. However, since the black ceramic print 12 around the logo portion 13 slightly transmits light, when the logo portion 13 is illuminated from the front, the outline of the light emitting region 30a of the rectangular organic EL unit around the brightly lit character Is a problem in appearance because it can be recognized slightly. However, this problem has been solved when the outline of the light emitting region 30a of the organic EL unit is covered with a light shielding sheet 15. Strictly speaking, the light shielding sheet opening range 15b around the logo portion 13 should be slightly shining, but since it is in the immediate vicinity of the brightly shining logo portion 13, this slight light cannot be confirmed with the naked eye. Not.

  (5) Light source controlled to an appropriate illuminance that does not disturb the screen: a mark such as a trademark, in this case, the purpose of shining the Candy logo 13 is to produce a high-quality product. Since the logo portion 13 of the present invention is close to the image display area, it has the disadvantage that it becomes difficult to see the displayed image if it is too conspicuous. The organic EL drive circuit board 32 includes a brightness adjustment circuit (not shown) that can adjust the brightness in three levels, and further selects the brightness adjustment circuit based on a signal from the control board. Is compared with a preset value to output a selection signal of the luminance adjustment circuit. That is, the luminance of the organic EL unit 30 is reduced to Low / Middle / as shown in FIG. 5 by switching the three-level luminance adjustment circuit of the organic EL drive circuit board 32 according to the power consumption (corresponding to the luminance of the display screen). High, ie, low / intermediate / high could be changed (see FIG. 5).

[Industrial applicability]
It can be used for a structure that displays characters, symbols, figures, and marks of electronic devices, and marks such as trademarks by internal lighting. This is effective when the internal storage capacity is small. In particular, if it is used in a thin image display device, it can be introduced without impairing the thin features and narrow frame features. Further, even if the structure of the present invention is adopted in the vicinity of the image display unit, the quality of the display image is not deteriorated, and the display image is not difficult to see.

Longitudinal sectional view of the bottom of the housing representing the best features of the thin image display device of the first invention Plan view seen from the back side of the bottom of the housing with the image display module removed Enlarged front view showing the overlapping positions of the parts that make up the logo Enlarged front view showing the overlapping positions of the parts that make up the logo A diagram showing the change in the brightness of the lighting corresponding to the power consumption Front view showing the logo position of a thin image display device, with the exterior partially cut out so that the internal image display module can be seen Longitudinal sectional view of the bottom of the housing representing the best features of the thin image display device of the second invention Plan view seen from the back side of the bottom of the housing with the image display module removed Enlarged front view showing the overlapping positions of the parts that make up the logo Sectional view of a display device disclosed in Japanese Patent Application Laid-Open No. 08-160890 Cross-sectional view of a thin video display device disclosed in JP-A-2005-267897

Explanation of symbols

1 Face plate (FP)
2 Rear plate (RP)
3 Electron emitting device 4 Matrix wiring 5 Frame member 6 Vacuum region 7 Chassis 8 Y direction FPC
9 Y driver board 10 Front frame 10a First light guide positioning 10b Second light guide positioning 10c LED circuit positioning 11 Front panel 12 Black ceramic printing 13 Logo part 14 Light guide 14a Diffusion processing surface 14b Bending part 14c Light Incident portion 14d Light emitting portion 14e Positioning portion 14f Holder positioning portion 14g Light guide outer shape 15 Light shielding sheet 15a Light shielding sheet outer shape 15b Light shielding sheet opening range 16 Light source 17 LED circuit board 18a Power cable 18b Control cable 19 Fixing member 20 Holder 20a Lifting prevention part 20b Locking claw 22 Electronic track 23 Display light beam 30 Organic EL unit 30a Light emitting area of the organic EL unit 31 Output cable 32 Organic EL drive circuit board 33 Output connector 34 Front frame 34a Holder positioning 35 fixing member 36 illumination beams 37 holder 37a engagement claw 50 before frame 51 front plate 52 image display area 53 light transmitting unit 54 face plate (FP)
55 Rear plate (RP)
56 X direction FPC 57 Y direction FPC
58 Wall around the front frame 61 Housing 62 Compartment 63 Light source 64 Color lens 65 Light guide plate 66 Light diffusing unit 67 Dial plate 68 Black printing unit 69 Print-out unit 71 Edge of the area where the image is displayed 72 Indicator panel 73 Operation input 74 slopes 75 light sources

Claims (17)

In an image display device incorporating an image display module equipped with an image display panel,
The front appearance portion includes a front plate that protects the image display module and a frame that attaches the front plate. Further, a light-emitting mark is disposed at a position that conceals the matrix wiring and FPC of the image display panel, An image display device characterized in that a structure for illuminating a mark is housed in an internal space on the front and side surfaces of the image display panel.   The structure for illuminating the mark includes an electric circuit having a light source and a light guide for guiding a light beam to a predetermined position. The light guide includes a light incident part near the light source and a light output part near the mark. The image display apparatus according to claim 1, further comprising: a structure in which an angle of a light beam emitted from the light emitting unit with respect to a light beam entering from the light incident unit is changed by about 90 °.   The image display apparatus according to claim 1, wherein the mark is expressed by a method of printing out a part of a print area on a transparent plate.   The image display device according to claim 1, wherein the light emission luminance of the mark mark changes according to an average luminance of a display image of the image display panel.   The image display device according to claim 2, wherein the light source is an LED element.   4. The image display device according to claim 3, wherein the printing on the transparent substrate is ceramic printing.   5. The image display device according to claim 2, wherein a circuit that changes light emission luminance of the mark is mounted on the electric circuit. 6.   Positioning of the electric circuit and the light guide is provided on the vertical surface inside the front surface of the frame and the horizontal surface inside the side surface, and the electric circuit and the light guide form a substantially L shape around the light source. The image display device according to claim 1, wherein the image display device is an image display device.   The light shielding member having a larger opening than the mark and having a larger outer shape than the light emitting part is inserted in a gap between the mark and the light emitting part. The image display device described.   The image display device according to claim 2, wherein the structure that changes the angle of the light beam by about 90 ° is a texture formed on a surface of the light guide opposite to the mark.   A bent portion is provided in the middle of the light incident portion and the light emitting portion of the light guide, and a slope is formed at the end of the light guide farthest from the light incident portion. 2. The image display device according to 2.   The image display device according to claim 10, wherein a white film is formed on a surface of the texture, the bent portion, and the inclined surface.   12. The image display device according to claim 2, wherein a film that blocks light in the light guide is formed on the light emitting portion side surface from the bent portion of the light guide.   The image display device according to claim 1, wherein the structure for illuminating the mark includes an electric circuit and a light emitting element.   The image display apparatus according to claim 14, wherein the electric circuit is an organic EL drive circuit, and the light emitting element is an organic EL module.   A light emitting area of the organic EL module having a larger opening than the mark in a gap between the mark and the organic EL module after increasing the light emitting area of the organic EL module than the mark. 16. The image display device according to claim 1, wherein a larger light shielding member is inserted.   The image display device according to claim 1, wherein the image display panel is a surface conduction electron emitter display (SED).

Images