WO2012141097A1 - Unité de rétroéclairage, et dispositif d'affichage à cristaux liquides - Google Patents

Unité de rétroéclairage, et dispositif d'affichage à cristaux liquides Download PDF

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Publication number
WO2012141097A1
WO2012141097A1 PCT/JP2012/059516 JP2012059516W WO2012141097A1 WO 2012141097 A1 WO2012141097 A1 WO 2012141097A1 JP 2012059516 W JP2012059516 W JP 2012059516W WO 2012141097 A1 WO2012141097 A1 WO 2012141097A1
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WIPO (PCT)
Prior art keywords
light
light guide
guide member
backlight unit
led
Prior art date
Application number
PCT/JP2012/059516
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English (en)
Japanese (ja)
Inventor
和樹 大福
Original Assignee
シャープ株式会社
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Filing date
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Publication of WO2012141097A1 publication Critical patent/WO2012141097A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0075—Arrangements of multiple light guides
    • G02B6/0078—Side-by-side arrangements, e.g. for large area displays
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines

Definitions

  • the present invention relates to an edge light type backlight unit that emits part of planar light having different luminance, and relates to a liquid crystal display device including the backlight unit.
  • liquid crystal display devices are often used as display devices.
  • the liquid crystal display device includes a liquid crystal panel unit and a backlight unit disposed on the back surface of the liquid crystal panel unit, and the liquid crystal panel unit transmits the degree of transmittance (transmittance) of planar light from the backlight unit. ) For each pixel, and an image is displayed in the image display area in front of the liquid crystal panel unit.
  • a light guide plate method (edge light method) that includes a light guide plate and receives light from the light receiving surface on the side surface of the light guide plate
  • the other is a direct type method in which a light source is arranged on the back surface of the liquid crystal panel unit. is there.
  • an edge light type backlight unit that is effective for thinning is often used (see Japanese Patent Laid-Open No. 9-160035).
  • a light emitting diode In the backlight unit, a light emitting diode (LED) is often used for the light source unit.
  • the LED itself is smaller and has a longer life than a fluorescent lamp (such as a cold-cathode tube) that has been conventionally used, and the drive circuit can be simplified, and the backlight unit can be further reduced in size and thickness. It becomes.
  • the edge light type backlight unit it is preferable to make the light as uniform as possible on the light receiving surface formed on the side surface of the light guide plate, and when using an LED that is a point light source, a plurality of LEDs are arranged in a straight line, A light source unit that turns on the plurality of LEDs uniformly and simultaneously is used.
  • the light receiving surface of the light guide plate is devised so as to be easily diffused, or the shape of the light guide plate is devised to diffuse the light from the LED within the light guide plate and be emitted from the light guide plate. (See Japanese Patent No. 3770558).
  • FIG. 10 is a layout view showing a backlight unit of a conventional liquid crystal display device.
  • the backlight unit 91 includes a light guide plate 92 and a light source unit 93 in which a plurality of LEDs 31 are linearly arranged.
  • the light emission of the light source unit 93 is controlled by the LED drive circuit 94.
  • the light source unit 93 has a plurality of LEDs 31 arranged in a straight line.
  • the light source unit 93 has a configuration in which a plurality of LEDs 31 are divided into LED blocks 931 to 935 every predetermined number (eight in this case). Inside the LED blocks 931 to 935, the LEDs 31 are connected in series, and the LED blocks 931 to 935 are connected in parallel.
  • the LED blocks 931 to 935 are connected to the LED drive circuit 94 in parallel.
  • the LED drive circuit 94 supplies the same current to the LED blocks 931 to 935, and the LED blocks 931 to 935 emit light with the same luminance. That is, the backlight unit 91 is configured to emit uniform planar light.
  • the observer (operator) is alerted when there is a predetermined input, or the performance is enhanced when a predetermined condition is satisfied. is there.
  • the liquid crystal display device an image with display contents that can be easily recognized by an observer is displayed, or an image is switched and displayed, thereby raising attention or enhancing the performance.
  • the liquid crystal display device cannot display a new image or cannot switch the image. It is difficult to call attention or improve performance.
  • the present invention is an edge light type backlight unit using an LED as a light source, and a backlight unit capable of clearly expressing a boundary portion where the luminance changes when adjusting the luminance of a part of the planar light, and
  • An object of the present invention is to provide a liquid crystal display device using the backlight unit.
  • the present invention provides a light source unit in which a plurality of LEDs are linearly arranged, a light guide plate that receives light from the light source unit on a light receiving surface, and emits the light from the light emitting surface as planar light.
  • the light guide plate includes a plurality of light guide members arranged side by side in the same direction as the LED arrangement direction.
  • the light guide plate is divided into a plurality of light guide members, it is difficult to receive interference from the light of the adjacent light guide member.
  • planar light with different luminance is emitted from the plurality of light guide members, it is possible to clarify the boundary where the luminance is different.
  • it is possible to enhance the effect of effect display such as highlight display in which the luminance of a part of the display image is higher than that of the other part and flash display in which a part of the luminance is changed.
  • the light source is divided into LED blocks for a certain number of LEDs, and the plurality of light guide members are formed such that each light receiving surface faces at least one LED block. It may be.
  • this configuration it is possible to accurately adjust the luminance of the light incident on the light guide member.
  • the said structure WHEREIN The said light guide member may have the reflection part formed in the side surface which faces an arrangement direction, and the said reflection part opposes the light guide member adjacent to the light guide member arrange
  • the light guide member may be formed with a light absorption part that absorbs light on a side surface facing the arrangement direction, and the light guide member adjacent to the light guide member disposed adjacent to the light absorption part. You may form in the side surface facing an optical member. Similar to the reflection part, it is possible to suppress the leakage of light from the side surface and enhance the effect.
  • a partition member may be disposed between the light guide members arranged adjacent to each other.
  • the partition member may be formed integrally with a case that is an exterior of the backlight unit.
  • the partition member may include a reflection portion that reflects light leaking from the side surface of the light guide member.
  • the partition member may include a light absorbing portion that absorbs light leaked from a side surface of the light guide member.
  • a liquid crystal display device can be exemplified.
  • an edge light type backlight unit using an LED as a light source and a backlight unit capable of clearly expressing a boundary portion where the luminance changes when adjusting the luminance of a part of the planar light, and A liquid crystal display device using this backlight unit can be provided.
  • FIG. 1 It is a block diagram which shows each part of the backlight unit shown in FIG. It is a figure of the display image in a liquid crystal display device provided with the backlight unit shown in FIG. It is a figure of the display image in a liquid crystal display device provided with the backlight unit shown in FIG. It is a layout view showing a backlight unit of a conventional liquid crystal display device.
  • FIG. 1 is an exploded perspective view of an example of a liquid crystal display device provided with a backlight unit according to the present invention.
  • the liquid crystal display device A includes a backlight unit 1 and a liquid crystal panel unit 5, and the liquid crystal panel unit 5 is disposed on the front side (observer side) of the backlight unit 1.
  • the backlight unit 1 is an illumination device that irradiates the liquid crystal panel unit 5 with planar light.
  • the backlight unit 1 includes a flat light guide plate 2, a light source unit 3 that irradiates light toward a light receiving surface 22 formed on a side surface of the light guide plate 2, and a diffusion unit disposed in the vicinity of the light guide plate 2.
  • an optical sheet group 4 including a sheet, a prism sheet, and the like.
  • the backlight unit 1 includes a case 10, and at least the light guide plate 2 and the light source unit 3 are disposed inside the case.
  • the light guide plate 2 is formed by forming a transparent resin such as polymethyl methacrylate (PMMA) or polycarbonate into a flat plate shape. In addition, it is not limited to these resin, The thing which can be formed in a transparent flat plate shape can be employ
  • the light guide plate 2 is formed by arranging a first light guide member 201, a second light guide member 202, and a third light guide member 203, which are flat members of the same size and shape.
  • the first light guide member 201 and the third light guide member 203 are in contact with the second light guide member 202 around the second light guide member 202.
  • the first light guide member 201 and the second light guide member 202, and the second light guide member 202 and the third light guide member 203 may be bonded.
  • the first light guide member 201, the second light guide member 202, and the third light guide member 203 have light exit surfaces 211, 212, and 213 that emit planar light, and light receiving surfaces that receive light from the light source unit 3, respectively. 221, 222, and 223.
  • the light guide plate 2 includes a light exit surface 21 in which the light exit surfaces 211, 212, and 213 are formed side by side, and a light receiving surface 22 in which the light receiving surfaces 221, 222, and 223 are formed side by side.
  • the light source unit 3 is disposed to face the light receiving surface 22.
  • the light source unit 3 includes a long substrate 30 disposed to face the light receiving surface 22 and a plurality of LEDs 31 (36 in this case) arranged linearly on the substrate 30.
  • the LEDs 31 are arranged at equal intervals, but may be an arrangement in which the intervals are partially changed.
  • FIG. 2 is a diagram showing a wiring state of the light source.
  • the light source unit 3 is divided into three LED blocks 321 to 323 composed of a predetermined number (here, 12) of LEDs 31.
  • the number of LEDs constituting one block is not limited to twelve, and the number of LED blocks is not limited to three.
  • each of the LED blocks 321 to 323 has 12 LEDs 31 connected in series.
  • the light source unit 3 shown in FIG. 2 has a configuration in which the anode sides of the LED blocks 321 to 323 are connected to a common wiring AN, and the cathode side is connected to independent cathode wirings K1 to K3.
  • the present invention is not limited to this configuration, and a configuration that can individually supply current to each of the LED blocks 321 to 323 can be widely employed.
  • the cathode side may be configured to be a common wiring, and both the anode side and the cathode side may be connected to independent wirings.
  • the anode wiring AN and the cathode wirings K1 to K3 are connected to an LED drive circuit 7 described later.
  • the LED 31 is a light emitting element whose luminance changes depending on the magnitude of current. Since the plurality of LEDs 31 in the LED blocks 321 to 323 are electrically connected in series, a current having the same current value is supplied and light is emitted with the same luminance. In addition, although mentioned later for details, the electric current supplied to LED31 is controlled by the pulse width modulation system (henceforth a PWM control).
  • light emitted from the LED block 321 enters from the light receiving surface 221 of the first light guide member 201, is repeatedly reflected in the first light guide member 201, and exits the light output surface 211. It is emitted as planar light with more uniform brightness.
  • light emitted from the LED block 322 enters from the light receiving surface 222 of the second light guide member 202 and is emitted from the light exit surface 212 as planar light.
  • planar light has a rectangular shape based on the shape of the light exit surfaces 211, 212, and 213. Since the light exit surfaces 211, 212, and 213 are arranged side by side, the surface light emitted from the light guide plate 2 is a combination of the surface lights emitted from the light exit surfaces 211, 212, and 213 side by side.
  • the first light guide member 201, the second light guide member 202, and the third light guide member 203 are divided, so that the first light guide member 201, The light received by the second light guide member 202 and the third light guide member 203 is repeatedly reflected inside the first light guide member 201, the second light guide member 202 and the third light guide member 203, and the light exit surfaces 211 and 212. 213. For this reason, the light incident on the first light guide member 201, the second light guide member 202, and the third light guide member 203 is less likely to enter the adjacent light guide member.
  • the liquid crystal panel unit 5 includes a liquid crystal panel 51 in which liquid crystal is sealed, and a polarizing plate 52 attached to the front surface (observer side) and the back surface (backlight unit 1 side) of the liquid crystal panel 51.
  • the liquid crystal panel 51 includes an array substrate, a counter substrate disposed to face the array substrate, and liquid crystal filled between the array substrate and the counter substrate.
  • the array substrate is provided with a source wiring and a gate wiring orthogonal to each other, a switching element (for example, a thin film transistor) connected to the source wiring and the gate wiring, a pixel electrode connected to the switching element, an alignment film, and the like.
  • the counter substrate is provided with a color filter in which colored portions of red, green, and blue (RGB) are arranged in a predetermined arrangement, a common electrode, an alignment film, and the like.
  • a voltage is applied between the array substrate and the counter substrate in each pixel of the liquid crystal panel 51 by driving the switching elements of the array substrate with a drive signal.
  • the degree of light transmission in each pixel is changed.
  • an image is displayed in the image display area on the viewer side of the liquid crystal panel 51.
  • FIG. 3 is a block diagram of a backlight unit included in the liquid crystal display device shown in FIG.
  • the LED blocks 321 to 323 including the LEDs 31 are schematically shown, but actually, the LEDs 31 are arranged on the substrate 30 and are divided into blocks in electrical connection.
  • the backlight unit 1 includes a light guide plate 2, a light source unit 3, an optical sheet group 4, an LED drive circuit 7, and the like.
  • the LED drive circuit 7 is a circuit that controls the light emission of the LEDs 31 of the LED blocks 321 to 323 by the PWM method. Note that the LED drive circuit 7 performs light emission control of the LED blocks 321 to 323 based on a pulse signal (referred to as a PWM signal) used in the PWM method.
  • a pulse signal referred to as a PWM signal
  • the LED drive circuit 7 causes the corresponding LED blocks 321 to 323 to emit light when the PWM signal is at the H level. From this, the light emission time of the LED blocks 321 to 323 is determined by the duty ratio of the PWM signal (hereinafter referred to as PWM value), that is, the light emission luminance of the LED blocks 321 to 323 is determined.
  • PWM value the duty ratio of the PWM signal
  • the light emission luminance of each of the LED blocks 321 to 323 is represented by a PWM value.
  • the PWM value is displayed as a decimal number between 0.0 (H level of PWM signal, 0%) to 1.0 (H level of PWM signal 100%).
  • the LED blocks 321 to 323 are connected to the LED drive circuit 7 via the common anode wiring AN on the anode side. Further, the cathode side is connected to the LED drive circuit 7 via cathode wirings K1 to K3 independent for each LED block.
  • the LED drive circuit 7 supplies a current to the LED blocks 321 to 323 individually by applying a constant voltage to the anode wiring AN and controlling the voltages applied to the cathode wirings K1 to K3. It is possible to do.
  • the LED drive circuit 7 applies voltages to the respective cathode wirings K1 to K3 so that the LED blocks 321 to 323 emit light at the corresponding PWM values, whereby each of the LED blocks 321 to 323 is applied. Perform light emission control.
  • FIG. 4A is a diagram showing a display image on the liquid crystal display device shown in FIG. 1, and FIG. 4B is a diagram showing an effect display image on the liquid crystal display device.
  • 4A and 4B are diagrams showing a three-digit number matching game (roulette).
  • FIG. 4A shows when the numbers change in all the display portions RL, RC, RR (normal state) Display image.
  • FIG. 4B shows a display image when the number of the display parts RL and RR on the left and right sides of the three-digit number is “9” (so-called reach state) (the effect display state is set). It is an example.
  • a highlighted display in the following description, sometimes referred to as highlight display
  • the areas corresponding to the LED blocks 321 to 323 of the display image will be described as A1 to A3.
  • the backlight unit 1 when displaying a display image Im1 having a uniform brightness as shown in FIG. 4A in the image display area, the backlight unit 1 emits planar light having a uniform brightness distribution, The LED blocks 321 to 323 emit light with the same light emission luminance. At this time, the LED drive circuit 7 controls the light emission of all the LED blocks 321 to 323 with the same PWM value (for example, 0.5).
  • the light emitted from the LED block 321 is incident on the light receiving surface 221 of the first light guide member 201, and the light emitted from the LED block 322 is incident on the light receiving surface 222 of the second light guide member 202. Further, the light emitted from the LED block 323 is incident on the light receiving surface 223 of the third light guide member 203. Since the LED blocks 321 to 323 are controlled to emit light with the same luminance as described above, the light emission surfaces 211, 212, and 213 of the first light guide member 201, the second light guide member 202, and the third light guide member 203 are uniform and Planar light with the same luminance is emitted.
  • Planar light emitted from the backlight unit 1 is emitted from the light exit surface 211 of the first light guide member 201, the light exit surface 212 of the second light guide member 202, and the light exit surface 213 of the third light guide member 203. Therefore, the planar light emitted from the backlight unit 1 has a uniform luminance distribution, and a display image Im1 having a uniform luminance is displayed (see FIG. 4A). At this time, the left display portion RL, the center display portion RC, and the right display portion RR of the roulette have the same luminance.
  • the central display portion RC is emphasized by emphasizing the central portion. It is possible to attract the attention of the observer (here, the player who is playing). That is, in the display image Im2 shown in FIG. 4B, the stage A2 has higher brightness than the areas A1 and A3 (highlighted display of the area A2), thereby enhancing the performance.
  • the planar light emitted from the backlight unit 1 has a high brightness in a portion corresponding to the area A2. It has a luminance distribution.
  • the luminance of the planar light emitted from the second light guide member 202 is higher than the luminance of the planar light emitted from the first light guide member 201 and the third light guide member 203.
  • the LED drive circuit 7 controls the light emission of the LED block 322 with a high PWM value (for example, 0.8) and the LED blocks 321 and 323 with a low PWM value (for example, 0.4).
  • the LED block 322 is controlled to emit light with a PWM value higher than that of the LED blocks 321, 323, the light emission luminance of the LED block 322 is higher than the light emission luminance of the LED blocks 321, 323.
  • the light emitted from the LED blocks 321, 322, and 323 is incident from the light receiving surfaces 221, 222, and 223 of the first light guide member 201, the second light guide member 202, and the third light guide member 203, respectively.
  • the brightness of the planar light emitted from the light exit surface 212 of the light guide member 202 is higher than the brightness of the planar light emitted from the light exit surface 211 of the first light guide member 201 and the light exit surface 213 of the third light guide member 203. Get higher.
  • the first light guide member 201, the second light guide member 202, and the third light guide member 203 are independent, the light is emitted from the LED block 321, the LED block 322, and the LED block 323. It is difficult for light to interfere, and the boundary of luminance of planar light is not easily blurred. As a result, as shown in FIG. 4B, the boundary portions of the areas A1 and A2 and A2 and A3 of the display image Im2 appear clearly, and the visual effect (production effect) by changing the luminance of the planar light can be enhanced. Is possible.
  • the PWM value is switched at a constant timing (for example, the PWM value is alternately switched to 0.4 or 0.8), and the LED block 322 is controlled to emit light, whereby the region A2 of the display image Im2 Can be switched at a constant timing.
  • the PWM value is switched at a constant timing (for example, the PWM value is alternately switched to 0.4 or 0.8)
  • the LED block 322 is controlled to emit light, whereby the region A2 of the display image Im2 Can be switched at a constant timing.
  • the LED drive circuit 7 causes the LED block 321 to emit light with a PWM value (0.8), and causes the LED blocks 322 and 323 to emit light with a PWM value (0.4). Then, every time a certain time elapses, the LED drive circuit 7 switches the PWM value (0.4) to the PWM value (0.8) in order of the LED block 322 and the LED block 323, and performs light emission control. The light emission control of the LED block having the PWM value (0.8) until then is performed with the PWM value (0.4). Further, after the LED block 323 is controlled to emit light with the PWM value (0.8), when a certain time elapses, the LED block 321 is controlled to emit light again with the PWM value (0.8).
  • the LED drive circuit 7 controls the current supplied to the LED blocks 321 to 323 as described above, so that the LEDs 322 and 323 can be made to emit light with high luminance in order from the LED block 321. For this reason, the highlight display of the effect display image moves in the order of the region A1, the region A2, and the region A3 every time a predetermined time elapses. As described above, the highlight display moves, so that it is possible to obtain a visual effect (production effect) with higher performance than the above-described production display state.
  • the light emission is controlled with the PWM value (0.8) in the order of the LED block 322 and the LED block 321 every time a certain time elapses. It is possible to obtain a visual effect (production effect) in which the high-luminance portion of the display image reciprocates left and right.
  • various visual effects production effects, for example, highlighting the areas A1 to A3 at random, etc.
  • FIG. 5 is an exploded perspective view of another example of the backlight unit according to the present invention.
  • the backlight unit 1B shown in FIG. 5 has the same configuration as that of the backlight unit 1 shown in FIG. 3 and the like except that the light guide plate 2B is different. Detailed description is omitted. Further, in the backlight unit 1B shown in FIG. 5, the optical sheet group 4 is omitted, but the same optical sheet group 4 as that of the backlight unit 1 is provided.
  • the first light guide member 201 and the second light guide member 202 face each other.
  • Reflecting portions 241 and 242 are formed at 231 and 232.
  • Reflecting portions 243 and 242 are similarly formed on the surfaces 233 and 232 of the third light guide member 203 and the second light guide member 202 facing each other. That is, the first light guide member 201 and the third light guide member 203 have a surface (one surface) adjacent to the second light guide member 202, and the second light guide member 202 has the first light guide member 201.
  • the reflection part is formed on both the surface adjacent to the third light guide member 203.
  • the opposing surfaces 231, 232, and 233 can also be referred to as side surfaces that face the arrangement direction of the first light guide member 201, the second light guide member 202, and the third light guide member 203.
  • the reflective part may be formed with a highly reflective metal film (reflective film) such as aluminum, or may be colored with a white pigment, dye, or the like.
  • a reflective member for example, reflection sheet
  • the structure which affixes a reflective member (for example, reflection sheet) with a high reflectance may be sufficient.
  • the structure (a structure etc. which has an unevenness
  • the light inside the first light guide member 201, the second light guide member 202, and the third light guide member 203 is reflected by the reflecting portions 241, 242, and 243.
  • the light of the 1st light guide member 201, the 2nd light guide member 202, and the 3rd light guide member 203 leaks from the surfaces 231, 232, and 233 which counter, and the 1st light guide member 201 which adjoins by the leaked light,
  • the effect of suppressing interference with the light inside the second light guide member 202 and the third light guide member 203 is further enhanced.
  • the reflective portions 241, 242, and 243 are formed on the first light guide member 201, the second light guide member 202, and the third light guide member 203, so that the display partially differs in luminance as shown in FIG. 4B.
  • the luminance boundary can be made clearer. As a result, it is possible to clarify a portion where an observer (player) wants to draw attention, and display of a display image with enhanced visual effect (production effect) becomes possible.
  • the first light guide member 201 and the third light guide member 203 are formed with the reflection portions 241 and 243 only on the surface facing the second light guide member 202.
  • a reflective portion may also be formed on the surface opposite to the surface facing the member 202.
  • a reflective portion is formed on one of the mutually facing surfaces of the first light guide member 201 and the second light guide member 202 and on one of the mutually facing surfaces of the third light guide member 203 and the second light guide member 202. May be.
  • the reflection part 241 is formed on the surface 231 facing the second light guide member 202 of the first light guide member 201, the surface 232 corresponding to the first light guide member 201 of the second light guide member 202 is formed.
  • the reflection part may not be formed.
  • the light in the second light guide member 202 is also reflected by the reflecting portion 241 and hardly leaks to the first light guide member 201 side. In this way, by forming the reflection portion on either the first light guide member 201 or the second light guide member 202, leakage of light from each light guide member 201, 202 can be suppressed. The same applies to the second light guide member 202 and the third light guide member 203.
  • the reflection part is formed only on one of the opposing surfaces in different light guide members, it is possible to save labor and time for forming the reflection part.
  • the light guide member is formed by forming the reflective part on the same side (for example, the right side when viewed from the front). It is possible to unify the configurations of the members 201, 202, and 203.
  • each light guide member replaces with a reflection part, and is used as a light absorption part which absorbs the light which leaks from each light guide member. Also good. In this case, since light leaking from the light guide member is absorbed, it is possible to prevent light from leaking to the adjacent light guide member.
  • a light absorption part what comprises and coat
  • FIG. 6 is an exploded perspective view of still another example of the backlight unit according to the present invention.
  • the backlight unit 1C shown in FIG. 6 has the same configuration as that of the backlight unit 1 shown in FIG. 1 except that the shape of the case 10C is different. The detailed description of is omitted.
  • the optical sheet group 4 is omitted, but the same optical sheet group 4 as that of the backlight unit 1 is provided.
  • the case 10 ⁇ / b> C of the backlight unit 1 ⁇ / b> C includes a first partition member 101 that partitions the first light guide member 201 and the second light guide member 202, and a second light guide member 202 and a third light guide member 203. And a second partition member 102 that partitions the space.
  • the first partition member 101 and the second partition member 102 are formed integrally with the case 10C, and are plate-like members that protrude from the bottom surface of the case 10C.
  • the first light guide member 201 is disposed inside the case 10C so as to be surrounded on all sides by the side wall protruding from the outer periphery of the case 10C and the first partition member 101.
  • the second light guide member 202 is disposed inside the case 10C so as to be surrounded on all sides by the first partition member 101, the second partition member 102, and the side wall of the case 10C.
  • the third light guide member 203 is disposed inside the case 10C so as to be surrounded on all sides by the side wall of the case 10C and the second partition member 102.
  • the first light guide member 201, the second light guide member 202, and the third light guide member 203 are arranged in the case 10 ⁇ / b> C so that light leaking from each light guide member can be separated from the first partition member 101 or the second light guide member 101. It can be blocked by the partition member 102. Thereby, the boundary of the part where the brightness of the display image changes in the effect display state is clarified, and the visual effect (effect effect) can be enhanced. Further, the first light guide member 201, the second light guide member 202, and the third light guide member 203 need only be arranged in the case 10C, and the labor for manufacturing / assembling the light guide member and the backlight unit 1C can be saved. Is possible.
  • both surfaces of the first partition member 101 and the second partition member 102 may be formed as reflective portions (for example, a metal film having a high reflectance is formed on the surface, or a white member). Moreover, both surfaces of the 1st partition rate 101 and the 2nd partition member 102 may be formed as a light absorption part (for example, black board member) which absorbs light.
  • the first partition member 101 and the second partition member 102 are formed integrally with the case 10C.
  • the present invention is not limited to this, and the first partition member 101 and / or the second partition member 102 are not limited thereto.
  • the two partition members 102 are formed separately from the case, and the first partition member 101 and the second partition member 102 are inserted between the first light guide member 201, the second light guide member 202, and the third light guide member 203. You may make it do.
  • FIG. 7 is an exploded perspective view showing another example of the backlight unit according to the present invention
  • FIG. 8 is a block diagram of the backlight unit shown in FIG.
  • the backlight unit 1D has the same configuration as the backlight unit 1 shown in FIG. 3 except that the light source 3 is different, and substantially the same parts are denoted by the same reference numerals and detailed description of the same parts is omitted.
  • the optical sheet group 4 is omitted, but the same optical sheet group 4 as that of the backlight unit 1 is provided.
  • FIGS. 9A and 9B show display images in the effect display state when the backlight unit shown in FIG. 8 is used.
  • the light source 3 includes six LED blocks 331 to 336 including a plurality of (here, six) LEDs 31.
  • the light from the LED blocks 331 and 332 is the first light guide member 201
  • the light from the LED blocks 333 and 334 is the second light guide member 202
  • the light from the LED blocks 335 and 336 is the third light guide member. 203, respectively.
  • the anode sides of the LED blocks 331 to 336 are connected to the LED driving circuit 7 via a common anode wiring AN
  • the cathode sides are connected to the LED driving circuit 7 via independent cathode wirings K1 to K6, respectively.
  • the LED drive circuit 7 is a circuit that supplies current to the LED blocks 331 to 336, and the current supply method is the same as that described in the first embodiment, and a specific description thereof is omitted.
  • the LED drive circuit 7 causes the LED blocks 331 to 336 to emit light based on the common PWM value.
  • the LED blocks 331 to 336 emit light with the same or substantially the same luminance, and a display image Im1 with a uniform luminance is displayed in the image display area of the liquid crystal panel unit 5 (see FIG. 4A).
  • the LED drive circuit 7 controls the light emission of the LED blocks 333 and 334 with a PWM value (for example, 0.8), and the LED blocks 331, 332, 335, and 336 with a PWM value (for example, 0.4). ) To control the light emission.
  • the current supplied to the LED blocks 333 and 334 is approximately twice the current supplied to the LED blocks 331, 332, 335, and 336, and the luminance is also approximately doubled.
  • the luminance of the planar light emitted from the second light guide member 202 is approximately twice the luminance of the planar light emitted from the first light guide member 201 and the third light guide member 203, and the liquid crystal panel unit
  • the effect display image displayed in the image display area 5 is substantially the same as the effect display image Im2 shown in FIG. 4B.
  • the effect display image Im2 in the effect display state is displayed.
  • the area A2 can be flushed at a constant timing. Thereby, it is possible to easily attract the attention of the observer (player) and enhance the visual effect (production effect). Note that when the area A2 of the effect display image Im2 is flashed, the current value supplied to the LED blocks 333 and 334 is constant.
  • the backlight unit 1D is configured such that light from two LED blocks enters one light guide member. That is, the light from the LED blocks 331 and 332 is input to the first light guide member 201, the light from the LED blocks 333 and 334 is input to the second light guide member 202, and the LED is input to the third light guide member 203. Light from the blocks 335 and 336 is incident on each of the blocks.
  • the region of the display image is subdivided, and the portion corresponding to the light from the LED block 331 in the region A1 is referred to as region A11, and the portion corresponding to the light from the LED block 332 is referred to as A12.
  • the area A2 is divided into areas A21 and A22, and the area A3 is divided into areas A31 and A32.
  • the brightness of the areas A21 and A22 in the area A2 are alternately changed in order to attract more attention to the area A2. By changing, it is possible to further enhance the visual effect (production effect).
  • the left LED block 333 is caused to emit light at a PWM value (0.8), and the right LED block 334 is caused to emit light at 0.6.
  • light emission control is performed so that the PWM values are switched at a predetermined timing, so that light having different luminances enters the second light guide member 202 and is emitted from the light exit surface 212.
  • the light has a luminance difference between the left and right.
  • luminance is replaced
  • the light from the LED block 333 interferes with the light from the LED block 334.
  • the boundary between the region A21 and the region A22 of the display image Im3 is not as clear as the boundary between the region A1 and the region A2, but the luminance changes between the region A21 and the region A22 of the display image Im3.
  • a visual effect (directing effect) that attracts the attention of a person).
  • the LED block with high emission luminance is changed from left to right. It is possible to move. Also at this time, in the first light guide member 201, the second light guide member 202, and the third light guide member 203, the light from the adjacent LED block interferes, but conversely, the boundary where the luminance is switched is not clear. The viewer (player) can visually recognize the high-luminance portion of the display image as if it moves smoothly. Thereby, it is possible to enhance the visual effect (production effect).
  • the effect is not limited to the above, and a display having more effect by controlling the light emission of the LED block (for example, a high-luminance portion that randomly generates a high-luminance portion of a display image is left and right). And so on).
  • the backlight unit 1D has the same configuration as that of the backlight unit 1.
  • the present invention is not limited to this, and the same configuration as the backlight unit 1B or the backlight unit 1C may be used.
  • the structure which the light from two LED blocks injects into each of the 1st light guide member 201, the 2nd light guide member 202, and the 3rd light guide member 203 it is not limited to this, You may make it the light from three or more LED blocks inject.
  • the number of LED blocks corresponding to the first light guide member 201, the second light guide member 202, and the third light guide member 203 may be different.
  • the first light guide member 201, the second light guide The member 202 and the third light guide member 203 may be configured to emit uniform planar light.
  • the liquid crystal display device using the backlight unit is described as being used as a display unit of a game device, but is not limited thereto, and is not limited to information appliances, notebook PCs, mobile phones, and the like. It can also be used as a display portion of electronic equipment. In that case, for example, the effect display state can be used as a caution display state for alerting the user when an incorrect input is made or when some trouble occurs.
  • the light guide plate includes three light guide members.
  • the present invention is not limited to this, and the light guide plate includes two or four or more light guide members. May be.
  • the light guide plate includes a light guide member having the same size and shape, but is not limited thereto, and includes light guide members having different sizes or shapes. It is good also as a structure.
  • the brightness of the LED block corresponding to the predetermined area of the display image is increased in the effect display state.
  • the brightness of the LED block corresponding to the predetermined area of the display image is described. You may make it perform control which lowers. By displaying in this way, sufficient effect display such as highlight display and flash display is possible due to the relative brightness difference between the regions of the display image, and the power consumption is reduced because the brightness of the LED block is lowered. It is possible.
  • the liquid crystal display device is described as an image display device using the backlight unit of the present invention.
  • the present invention is not limited to this, and the backlight unit according to the present invention is a transmissive type. It can be widely used in image display devices.
  • the backlight unit and the liquid crystal display device according to the present invention can be used as a display unit of an electronic device such as an information appliance, a notebook PC, a mobile phone, or a game device.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Planar Illumination Modules (AREA)

Abstract

L'invention porte sur une unité de rétroéclairage (1) comportant une pluralité d'éléments de guidage de lumière (201, 202, 203), qui possède : une unité de source de lumière (3) dans laquelle une pluralité de diodes électroluminescentes (31) sont disposées en ligne droite, et qui est divisée en bloc de diodes électroluminescentes (321 à 323) par un nombre prédéterminé de diodes électroluminescentes ; et une plaque de guidage de lumière (2) qui reçoit la lumière à partir de l'unité de source de lumière (3) en une surface de réception de lumière, et qui émet la lumière précédemment mentionnée sous la forme d'une lumière plane à partir d'une surface émettrice de lumière. La plaque de guidage de lumière (2) est disposée dans la même direction que la direction de disposition des diodes électroluminescentes (31).
PCT/JP2012/059516 2011-04-12 2012-04-06 Unité de rétroéclairage, et dispositif d'affichage à cristaux liquides WO2012141097A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011-088554 2011-04-12
JP2011088554 2011-04-12

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WO2012141097A1 true WO2012141097A1 (fr) 2012-10-18

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003098545A (ja) * 2001-09-20 2003-04-03 Sharp Corp 両面表示型液晶表示装置およびそれを備えた携帯型電子機器
JP2007122971A (ja) * 2005-10-26 2007-05-17 Sharp Corp 面光源装置およびそれを用いた画像表示装置
JP2009104911A (ja) * 2007-10-24 2009-05-14 Aristo Engineering Pte Ltd 平面照明装置
JP2009152022A (ja) * 2007-12-20 2009-07-09 Citizen Electronics Co Ltd シート状導光体及び操作キー照明装置並びに電子機器
WO2009144853A1 (fr) * 2008-05-30 2009-12-03 シャープ株式会社 Dispositif d'éclairage, dispositif d'affichage et plaque de guidage de lumière

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003098545A (ja) * 2001-09-20 2003-04-03 Sharp Corp 両面表示型液晶表示装置およびそれを備えた携帯型電子機器
JP2007122971A (ja) * 2005-10-26 2007-05-17 Sharp Corp 面光源装置およびそれを用いた画像表示装置
JP2009104911A (ja) * 2007-10-24 2009-05-14 Aristo Engineering Pte Ltd 平面照明装置
JP2009152022A (ja) * 2007-12-20 2009-07-09 Citizen Electronics Co Ltd シート状導光体及び操作キー照明装置並びに電子機器
WO2009144853A1 (fr) * 2008-05-30 2009-12-03 シャープ株式会社 Dispositif d'éclairage, dispositif d'affichage et plaque de guidage de lumière

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