WO2012141172A1 - 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
WO2012141172A1
WO2012141172A1 PCT/JP2012/059782 JP2012059782W WO2012141172A1 WO 2012141172 A1 WO2012141172 A1 WO 2012141172A1 JP 2012059782 W JP2012059782 W JP 2012059782W WO 2012141172 A1 WO2012141172 A1 WO 2012141172A1
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Prior art keywords
led
liquid crystal
backlight unit
light
luminance
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PCT/JP2012/059782
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English (en)
Japanese (ja)
Inventor
和樹 大福
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シャープ株式会社
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Publication of WO2012141172A1 publication Critical patent/WO2012141172A1/fr

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    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source

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.
  • backlight units There are two types of backlight units.
  • One is a light guide plate method (edge light method) that includes a light guide plate and allows light to enter from the light incident surface of the side surface of the light guide plate, and the other is a direct type method in which a light source is arranged on the back surface of the liquid crystal panel unit. It is.
  • a light guide plate method edge light method
  • a direct type method in which a light source is arranged on the back surface of the liquid crystal panel unit. It is.
  • 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 incident as uniform as possible on the light incident surface formed on the side surface of the light guide plate.
  • a plurality of LEDs are arranged in a straight line.
  • a light source unit that uniformly and simultaneously lights the plurality of LEDs is used.
  • the light incident 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 in the light guide plate.
  • the uniformity of the emitted planar light is improved (see Japanese Patent No. 3770558).
  • FIG. 11 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 divides a plurality of LEDs 31 into LED blocks 931 to 935 every predetermined number (here, 8). 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 drive circuit 94 includes a connector 941 and an LED control circuit 95.
  • the LED blocks 931 to 935 are connected to the LED control circuit 95 in parallel.
  • the LED power supply (LEp), the enable signal (ES), and the luminance adjustment signal (Lm) are input to the LED drive circuit 94 via the connector 941.
  • the luminance adjustment signal (Lm) is a signal for adjusting the luminance of the planar light.
  • the enable signal (ES) and the luminance adjustment signal (Lm) are transmitted to the LED control circuit 95.
  • the LED control circuit 95 switches on / off the LED blocks 931 to 935 in accordance with the input of the enable signal (ES). That is, the LED control circuit 95 confirms the enable signal (ES) and controls the brightness of the LED blocks 931 to 935 (LED 31) based on the brightness adjustment signal (Lm).
  • the LED control circuit 95 is configured to receive a single luminance adjustment signal (Lm) and control light emission of each LED block 931 to 935 based on the luminance adjustment signal (Lm). ⁇ 935 emit light with the same luminance.
  • 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 may be 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 adjusts the luminance of a part of the planar light based on a signal from the outside.
  • An object of the present invention is to provide a backlight unit capable of directing consciousness and a liquid crystal display device using the backlight unit.
  • the present invention includes a light source unit that includes a plurality of LEDs and is divided into a plurality of LED blocks for each of a certain number of LEDs, and receives light from the light source unit and emits planar light.
  • the LED control means can control the light emission of each of the plurality of LED blocks independently. By causing the plurality of LED blocks to emit light with the same luminance, uniform planar light can be emitted.
  • an arbitrary LED block can be made to emit light with a luminance different from that of other LED blocks, and planar light having a partially different luminance can be irradiated.
  • the LED control means may control the light emission of the LED block by PWM control.
  • the luminance adjustment signal supplied to the LED control means may be a PWM signal used for PWM control.
  • a PWM circuit may be provided that generates a brightness adjustment signal based on the brightness information of the LED block and sends the signal to the LED control means.
  • the light source units are systematically divided into a predetermined number of LED blocks, and the LED control means controls the corresponding LED blocks of each system to emit light with the same luminance.
  • a liquid crystal display device including the backlight unit having the above-described configuration and a liquid crystal panel unit arranged in front of the backlight unit can be exemplified.
  • the video signal processing means for generating a liquid crystal drive signal for driving the liquid crystal panel unit based on the input video signal, wherein the video signal processing means includes the luminance adjustment signal and the liquid crystal drive signal. And may be synchronized.
  • the present invention is an edge light type backlight unit using an LED as a light source, and the brightness of a part of the planar light is adjusted based on a signal from the outside. It is possible to provide a backlight unit capable of directing consciousness and a liquid crystal display device using the backlight unit.
  • FIG. 6 is a schematic circuit diagram of a light source provided in the backlight unit shown in FIG. 5. It is a figure which shows the display image at the time of an effect display state.
  • FIG. 1 It is a block diagram of the further another example of a liquid crystal display device. It is a figure which shows the display image in the liquid crystal display device shown in FIG. It is a block diagram of the further another example of a liquid crystal display device. 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 is disposed close to the light guide plate 2, the light source unit 3 that emits light toward the light incident surface 22 formed on the side surface of the light guide plate 2, and the light guide plate 2.
  • an optical sheet group 4 including a diffusion sheet, a prism sheet, and the like.
  • the light guide plate 2 is formed by forming a transparent resin such as polymethyl methacrylate (PMMA) or polycarbonate into a flat plate shape.
  • the light guide plate 2 has a rectangular main surface, and one main surface forms a light output surface 21 that emits planar light. Further, the side surface on one long side of the main surface forms a light incident surface 22 that receives light from the light source unit 3.
  • the light source unit 3 is disposed to face the light incident surface 22.
  • the light source unit 3 includes a long substrate 30 disposed to face the light incident surface 22 and a plurality of LEDs 31 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. As shown in FIG. 2, the light source unit 3 is divided into five LED blocks 321 to 325 including a predetermined number (eight in this case) of LEDs 31. The number of LEDs constituting one block is not limited to eight, and the number of LED blocks is not limited to five.
  • each of the LED blocks 321 to 325 has eight LEDs 31 connected in series, and each of the LED blocks 321 to 325 can supply current individually.
  • the light source unit 3 shown in FIG. 2 has a configuration in which the anode sides of the LED blocks 321 to 325 are connected to a common wiring AN, and the cathode sides are connected to independent cathode wirings K1 to K5, respectively. Note that 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 325 can be widely employed.
  • the structure which makes the cathode side common wiring may be sufficient, and both the anode side and the cathode side may be connected to the independent wiring.
  • 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 325 are electrically connected in series, a current having the same current value is supplied and light is emitted with the same luminance. Although details will be described later, the light emission control of the LED blocks 321 to 325 is controlled by a pulse width modulation method (hereinafter also referred to as PWM control).
  • PWM control pulse width modulation method
  • 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 showing each part included in the liquid crystal display device shown in FIG.
  • the LED blocks 321 to 325 including the LEDs 31 are schematically shown. However, actually, the LEDs 31 arranged on the substrate 30 are divided for convenience.
  • the liquid crystal display device A includes a backlight unit 1, a liquid crystal panel unit 5, a receiving unit 61, a liquid crystal panel controller 62, and the like.
  • 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 receiving unit 61 is a video signal (white color) including LCD data signals (LCs) that are driving signals for switching elements of the liquid crystal panel unit 5 and luminance adjustment signals (Lm1 to Lm5) for adjusting the luminance of the backlight unit 1.
  • LCD data signals LCs
  • luminance adjustment signals Lm1 to Lm5
  • the liquid crystal panel controller 62 sends a drive signal to the switching element of the liquid crystal panel unit 5 based on the LCD data signals (LCs). Thereby, a voltage is applied to the liquid crystal arranged in each pixel, and the transmittance (transmittance) of the planar light from the backlight unit 1 is adjusted for each pixel.
  • the LED drive circuit 7 is supplied with LED power (LEp). Further, the LED drive circuit 7 has a configuration in which an enable signal (Es) and luminance adjustment signals (Lm1 to Lm5) for adjusting the luminance of the LED blocks 321 to 325 can be received via the connector 71. .
  • the LED drive circuit 7 includes an LED control circuit 8 (LED control means) that controls the light emission of the LED blocks 321 to 325 of the backlight unit 1.
  • the LED control circuit 8 is configured to receive the luminance adjustment signals (Lm1 to Lm5) and the enable signal (Es).
  • the LED control circuit 8 is a circuit that controls the light emission of the LEDs 31 of the LED blocks 321 to 325 by the PWM method.
  • the luminance adjustment signals (Lm1 to Lm5) input to the LED control circuit 8 are pulse signals (sometimes referred to as PWM signals) used in the PWM method.
  • the LED control circuit 8 causes the corresponding LED blocks 321 to 325 to emit light when the luminance adjustment signals (Lm1 to Lm5) are at the H level. From this, the light emission time of the LED blocks 321 to 325 is determined by the duty ratio of the PWM signal (hereinafter referred to as PWM value), and the light emission luminance of the LED blocks 321 to 325 is determined.
  • 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 enable signal (Es) is a signal for controlling turning on / off of the LED 31. That is, when the LED control circuit 8 confirms that the enable signal (Es) has become H level, the LED control circuit 8 starts the light emission control of the LED blocks 321 to 325 based on the luminance adjustment signals (Lm1 to Lm5). To do.
  • the LED blocks 321 to 325 have their anodes connected to the LED control circuit 8 via the anode wiring AN.
  • the cathode side is connected to the LED control circuit 8 via cathode wirings K1 to K5 independent for each LED block.
  • the LED control circuit 8 applies the same voltage to the anode side of the LED blocks 321 to 325, and sets the voltage on the cathode side of the corresponding LED blocks 321 to 325 based on the luminance adjustment signals (Lm1 to Lm5). By controlling, current is supplied to the LED blocks 321 to 325 to perform light emission control.
  • FIG. 4A is a diagram showing a display image in the normal state of the liquid crystal display device shown in FIG. 3, and FIG. 4B is a diagram showing the display image when the display is switched to the effect display state.
  • FIGS. 4A and 4B for convenience of explanation, a gray display screen is used, and a portion with high luminance in FIG. 4B is displayed in white.
  • the liquid crystal display device A normally displays a display image with uniform brightness, but when a specific condition is satisfied ⁇ for example, when used as a display of a game device, when a game role is completed (so-called hit ) Or just before the hit (so-called reach) ⁇ , there is a case where an effect display for enhancing the effect is performed.
  • the liquid crystal display device A will be described as a case where it is used as a display unit of a game device, but the present invention is not limited to this.
  • the planar light emitted from the backlight unit 1 needs to have a uniform luminance distribution. Therefore, the luminance adjustment signals (Lm1 to Lm5) having the same PWM value (for example, 0.5) are input to the LED drive circuit 7.
  • the LED control circuit 8 controls the light emission of the LED blocks 321 to 325 based on the luminance adjustment signals (Lm1 to Lm5). Since the PWM values of the luminance control signals (Lm1 to Lm5) are the same, the LED blocks 321 to 325 emit light with the same luminance.
  • uniform (substantially uniform) light enters the light incident surface 22 of the light guide plate 2, and planar light having a uniform luminance distribution (substantially uniform) is emitted from the light exit surface 21. .
  • planar light having a uniform luminance distribution is emitted from the light exit surface 21.
  • the image display area of the liquid crystal panel unit 5 is uniform (substantially uniform) as shown in FIG. 4A.
  • a luminance display image Im1 is displayed.
  • a display image having a high luminance such as the display image Im2 shown in FIG. 4B is displayed in the image display area of the liquid crystal display device A.
  • an effect display image such as the display image Im2 shown in FIG. 4B
  • the areas corresponding to the LED blocks 321 to 325 of the display image are A1 to A5.
  • the area A2 and the area A4 are higher in luminance than the other areas A1, A3, and A5, that is, the area A2 and the area A4 are highlighted.
  • the planar light emitted from the backlight unit 1 has a high luminance distribution in portions corresponding to the areas A2 and A4.
  • the luminance adjustment signals (Lm1 to Lm5) received by the LED drive circuit 7 have the PWM values (for example, 0.8) of the luminance adjustment signals (Lm2, Lm4) and the luminance adjustment signals (Lm1, Lm3). , Lm5) is higher than the PWM value (for example, 0.5).
  • the LED control circuit 8 performs light emission control of the LED blocks 321 to 325 based on the luminance adjustment signals (Lm1 to Lm5). Since the PWM value of the luminance adjustment signals (Lm2, Lm4) is higher than the PWM value of the luminance adjustment signals (Lm1, Lm3, Lm5), the emission luminance of the LED blocks 322, 324 is the LED blocks 321, 323, 325. It becomes higher than the emission luminance of
  • the planar light emitted from the light exit surface 21 The luminance distribution is also higher in the portions corresponding to the LED blocks 322 and 324 than in the other portions.
  • the luminances of the regions A2 and A4 corresponding to the LED blocks 322 and 324 of the effect display image Im2 are higher than those of the other regions A1, A3, and A5. In other words, the areas A2 and A4 are highlighted (see FIG. 4B).
  • the LED control circuit 8 can receive the luminance adjustment signal for adjusting the light emission luminance of each LED block supplied from the outside, and based on the luminance adjustment signal, the LED blocks 321 to 325 can be received.
  • the brightness of a part (areas A2 and A4) of the effect display image Im2 can be made higher (highlighted display) than the other parts (area A1, area A3, area A5), It is possible to improve the performance as compared with the display image Im1 in a normal state with uniform luminance.
  • the LED control circuit 8 can perform an effect display such that the highlight portion moves. For example, the LED control circuit 8 determines that one PWM value of the luminance adjustment signals (Lm1 to Lm5) is 0.8, the remaining PWM value is 0.5, and the PWM value is 0.8 each time a certain time elapses. Assume that a luminance adjustment signal is received such that the luminance adjustment signals are sequentially switched. After the luminance adjustment signal (Lm5), the PMW value of the luminance adjustment signal (Lm1) is switched to 0.8.
  • the LED control circuit 8 receives the luminance adjustment signals (Lm1 to Lm5) as described above, and causes the LEDs 322, 323, 324, and 325 to emit light with high luminance in order from the LED block 321. As described above, the LED blocks 321 to 325 are controlled to emit light by the LED control circuit 8, so that the area A 2, the area A 3, The brightness of the area A4 and the area A5 is increased, that is, the highlight display portion is moved, and a higher visual effect (effect effect) than the above-described effect display can be obtained.
  • the PWM value of the luminance adjustment signal (Lm5) when a certain time elapses after the PWM value of the luminance adjustment signal (Lm5) has reached 0.8, the PWM value changes to 0.8 in the order of the luminance adjustment signals Lm4, Lm3, Lm2, and Lm1. In some cases, it is possible to obtain a visual effect (production effect) in which the highlight display portion of the display image reciprocates left and right. In addition to these, various effects can be obtained by the luminance adjustment signals (Lm1 to Lm5).
  • FIG. 5 is a block diagram showing a liquid crystal display device provided with another example of a backlight unit according to the present invention
  • FIG. 6 is a schematic circuit diagram of a light source provided in the backlight unit shown in FIG.
  • the liquid crystal display device B has the same configuration as the liquid crystal display device A shown in FIG. 3 except that the light source 3 is different. .
  • the light source 3 includes ten LED blocks including a plurality (four in this case) of LEDs 31.
  • the LED blocks are divided into LED blocks 331 to 335 on the left side (referred to as A system) and LED blocks 331 to 335 on the right side (referred to as B system).
  • the anode side wirings of the A system LED blocks 331 to 335 and the B system LED blocks 331 to 335 are common.
  • the cathode side of each of the A system LED blocks 331 to 335 and the B system LED blocks 331 to 335 is connected to a common cathode side wiring K1 to K5. More specifically, the A-system LED block 331 and the B-system LED block 331 are connected to a common cathode-side wiring K1.
  • the cathode side of each of the A system LED blocks 332 to 335 and the B system LED blocks 332 to 335 is connected to cathode side wirings K2 to K5.
  • the anode side wiring AN and the cathode side wirings K1 to K5 are connected to the LED control circuit 8.
  • the LED control circuit 8 receives luminance adjustment signals (Lm1 to Lm5).
  • the LED control circuit 8 receives luminance adjustment signals (Lm1 to Lm5) having a constant PWM value (for example, 0.5) when displaying a display image with uniform luminance.
  • the LED blocks 331 to 335 of the A system and the B system each emit light with the same luminance. Thereby, in the liquid crystal display device B, for example, a display image with little luminance unevenness as shown in FIG. 4A can be displayed.
  • FIG. 7 is a view showing a display image in the effect display state.
  • the display image Im3 will be described from the left as a region B1 to a region B10.
  • the regions B1 to B5 correspond to the A system LED blocks 331 to 335
  • the regions B6 to B10 correspond to the B system LED blocks 331 to 335.
  • the LED control circuit 8 When performing effect display in the liquid crystal display device B, the LED control circuit 8 supplies current to each of the LED blocks 331 to 335 of the A system and the B system based on the luminance adjustment signals (Lm1 to Lm5). For example, the LED control circuit 8 controls the light emission of the LED blocks 331 of the A system and the B system based on the luminance adjustment signal Lm1. The supply of current to the LED blocks 331 to 335 by the LED control circuit 8 is the same as described above, and will be omitted. The LED control circuit 8 controls the light emission of the LED blocks 332 to 335 of the A system and the B system based on the luminance adjustment signals Lm2 to Lm5.
  • the A system The LED blocks 332 and 334, and the B system LED blocks 332 and 334 have higher emission luminance.
  • the display image Im3 displayed on the liquid crystal display device B has luminance as shown in FIG. That is, the brightness of the region B2, the region B4, the region B7, and the region B9 is higher than that of other regions.
  • the liquid crystal display device B it is possible to display a display image with high performance by displaying high luminance in a part of the region.
  • the liquid crystal display device A it is possible to change the brightness of some of the LED blocks, or to move an area with high brightness next to each other in order, thereby improving performance.
  • the region B1 to the region B5 corresponding to the A system and the region B6 to the region B10 corresponding to the B system perform the same effect display, so that the effect display with higher performance can be performed. it can.
  • the LED blocks 331 to 335 in the A area are arranged from left to right
  • the LED blocks 331 to 335 in the B area are arranged from right to left
  • brightness adjustment is performed so that the LED block 331 to the LED block 335 emit light with high luminance in order.
  • the light source 3 is provided with two systems of the A system and the B system.
  • the present invention is not limited to this, and more systems may be provided.
  • FIG. 8 is a block diagram of still another example of the liquid crystal display device
  • FIG. 9 is a diagram showing a display image on the liquid crystal display device shown in FIG.
  • the liquid crystal display device C is a display unit of the gaming device, and displays a three-digit roulette as shown in FIG.
  • the state shown in FIG. 9 is a so-called reach state in which the left and right display portions RL and RR have a number “9” and the center display portion RC has a number “9”. It is.
  • the liquid crystal display device C shown in FIG. 8 has substantially the same configuration as the liquid crystal display device A. Further, the left display portion RL is displayed in the region C2, the right display portion RR is displayed in the region C4, and the center display portion RC is displayed in the region C3.
  • the liquid crystal display device C is the same as the liquid crystal display device A when performing uniform image display. That is, the LED control circuit 8 receives luminance adjustment circuits (Lm1 to Lm5) having the same PWM value, and causes the LED blocks 321 to 325 to emit light so as to have the same luminance. At this time, planar light having a uniform luminance distribution is emitted from the backlight unit 1 regardless of the display image in the image display area.
  • the liquid crystal display device C includes a signal processing unit 63 that synchronizes the luminance adjustment signals (Lm1 to Lm5) and the LCD data signals (LCs).
  • the signal processing unit 63 synchronizes the LCD data signals (LCs) and the luminance adjustment signals (Lm1 to Lm5) in consideration of the difference in operation time between the liquid crystal panel controller 62 and the LED drive circuit 7, thereby producing the effect.
  • the display image and the planar light are accurately synchronized.
  • the LED control circuit 8 receives the luminance adjustment signal Lm3 having a PWM value of 0.8 and the luminance adjustment signals (Lm1, Lm2, Lm4, Lm5) having a PWM value of 0.4.
  • the LED control circuit 8 performs light emission control of the corresponding LED blocks 321 to 325 based on the luminance adjustment signals (Lm1 to Lm5). At this time, since the LED block 323 is controlled with a PWM value of 0.8, the LED block 323 emits light with higher brightness than when an image with uniform brightness is displayed. On the contrary, since the LED blocks 321, 322, 324, and 325 are controlled with a PWM value of 0.4, the light emission luminance is reduced as compared with the case of displaying an image with uniform luminance as described above. Since the LED blocks 321 to 325 emit light with such luminance, as shown in FIG. 9, the luminance of the region C3 which is the left and right central portion of the display image Im4 is high, and the remaining regions C1, C2, C4, The brightness of the area C5 is lowered.
  • the LCD data signals (LCs) and the brightness adjustment signals (Lm1 to Lm5) are synchronized by the signal processing unit 63, the area C1, the number of the left and right display parts RL and RR in FIG. C2, C4, and C5 are darkened, and a highlight display is performed in which the region C3 including the central display portion RC where the display of numbers is switched is displayed brightly.
  • the luminance of each region of the effect display image Im4 can be switched quickly or late, resulting in a rendering effect. Can be suppressed. It is not limited to highlight display, and even when the flash or highlight moves, the brightness of the planar light is adjusted according to the effect display image, so that the effect of the effect is prevented from being lowered. It is possible.
  • the signal processing unit 63 resynchronizes them again.
  • the signal processing unit 63 resynchronizes them again.
  • FIG. 10 is a block diagram of still another example of the liquid crystal display device.
  • the liquid crystal display device D shown in FIG. 10 has the same configuration as the liquid crystal display device A shown in FIG. 3 except that the LED drive circuit 7 includes a PWM circuit 81 (current value determination circuit).
  • PWM circuit 81 current value determination circuit
  • the liquid crystal display device D includes a PWM circuit 81 inside the LED drive circuit 7.
  • the receiver 61 receives luminance adjustment data Ld1 to Ld5 from the outside.
  • the brightness adjustment data Ld1 to Ld5 are data indicating the brightness of the LED blocks 321 to 325, and are, for example, 12-bit digital data.
  • the brightness adjustment data Ld1 to Ld5 are sent to a PWM circuit 81 provided in the LED drive circuit 7.
  • the PWM circuit 81 generates luminance adjustment signals (Lm1 to Lm5) based on the luminance adjustment data Ld1 to Ld5, and sends them to the LED control circuit 8.
  • the LED control circuit 8 performs light emission control of the LED blocks 321 to 325 based on the luminance adjustment signals (Lm1 to Lm5).
  • the LED drive circuit 7 of the backlight unit 1 receives a luminance adjustment signal or luminance adjustment data for adjusting the luminance of each LED block from the outside, and performs light emission control of each LED block. Yes.
  • the backlight unit according to the present invention can generate a PWM signal internally, so that it can also be employed as a backlight unit of a display device of an electronic device that does not have a circuit for performing PWM control. It is.
  • the liquid crystal display devices A to D are described as being used as display units of the game device.
  • the present invention is not limited to this, and electronic devices such as information home appliances, notebook PCs, and mobile phones are used. It can also be used as a display unit.
  • 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 brightness of the LED block corresponding to the predetermined area of the display image is increased in the effect display state, but the LED corresponding to the predetermined area of the display image is displayed. You may make it perform control which makes the brightness
  • 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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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

L'invention porte sur une unité de rétroéclairage qui comporte : une unité de source de lumière (3) ayant une pluralité de DEL (31) et divisée en une pluralité de blocs de DEL (321 à 325) pour un nombre prédéterminé de DEL (31) ; une plaque de guide de lumière (2) pour recevoir la lumière provenant de l'unité de source de lumière (3) et pour émettre une lumière plane ; et un moyen de commande de DEL (7) apte à commander l'émission de lumière des blocs de DEL (321 à 325) sur la base d'un signal d'ajustement de luminance. Le moyen de commande de DEL (7) reçoit un signal d'ajustement de luminance pour chaque bloc de DEL (321 à 325).
PCT/JP2012/059782 2011-04-15 2012-04-10 Unité de rétroéclairage et dispositif d'affichage à cristaux liquides WO2012141172A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011-091274 2011-04-15
JP2011091274 2011-04-15

Publications (1)

Publication Number Publication Date
WO2012141172A1 true WO2012141172A1 (fr) 2012-10-18

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104266113A (zh) * 2014-07-30 2015-01-07 友达光电股份有限公司 背光模块

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007293339A (ja) * 2006-04-21 2007-11-08 Samsung Electro-Mechanics Co Ltd 液晶表示装置用のバックライトユニット
JP2011054964A (ja) * 2009-09-01 2011-03-17 Samsung Electronics Co Ltd Ｌｅｄ駆動装置及び方法、これを利用するｌｅｄ駆動システム及び液晶表示装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007293339A (ja) * 2006-04-21 2007-11-08 Samsung Electro-Mechanics Co Ltd 液晶表示装置用のバックライトユニット
JP2011054964A (ja) * 2009-09-01 2011-03-17 Samsung Electronics Co Ltd Ｌｅｄ駆動装置及び方法、これを利用するｌｅｄ駆動システム及び液晶表示装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104266113A (zh) * 2014-07-30 2015-01-07 友达光电股份有限公司 背光模块

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