JP2013109242A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device capable of reducing power consumption by adjusting brightness of a back light, improving color contrast and improving black tightness.SOLUTION: LED elements 52 composing a light source of a back light 41 are arranged so as to correspond to a plurality of pixels of a liquid crystal display panel 35. A brightness signal in video signals suppresses emission amounts of the LED elements 52 especially in a dark part of a video so that the light sources of the LED elements 52 of the back light 41 emit light at brightness corresponding to brightness levels related to some or all of the plurality of pixels.

Description

  The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device that includes a backlight on the back side of a liquid crystal display panel, and that the liquid crystal display panel performs display according to a video signal with light from the backlight.

  A liquid crystal display device includes a TFT substrate in which pixel electrodes and thin film transistors (TFTs) are formed in a matrix, and a counter electrode in which a color filter is formed at a location corresponding to the pixel electrode of the TFT substrate, facing the TFT substrate. And a structure in which liquid crystal is sandwiched between the TFT substrate and the counter electrode is employed. A color image is formed by controlling the light transmittance of the liquid crystal molecules for each of R (red), G (green), and B (blue) of the pixel.

  Since liquid crystal display devices can be made thin and light, they are used in various fields including television receivers. Since the liquid crystal itself does not emit light, a backlight is disposed on the back of the liquid crystal display panel. In a liquid crystal display device having a relatively large screen such as a television receiver, a fluorescent tube has been conventionally used as a backlight. However, an LED (Light Emitting Diode) is used to reduce the thickness of the liquid crystal display device or to increase the color display area.

  There are two types of backlight light sources: a direct light type in which the light source is arranged directly below (back) the liquid crystal display panel and a side light type in which the light source is arranged on the side of the light guide plate. In a display device, a direct light source is used in order to ensure sufficient screen brightness.

  In the formation of a color image in a liquid crystal display device, light in which the hue and brightness of each pixel are adjusted is generated by adding and mixing R, G, and B colors, and such light is emitted for each pixel. Thus, an image is formed by combining the light of these pixels. Here, the liquid crystal display panel is configured such that the liquid crystal forms a shutter for each of R, G, and B of each pixel for each of the colors R, G, and B, and R, G, and B for white light. The liquid crystal shutters for each color of B were fully opened, and all the light from the back side was transmitted so that white light was emitted by the addition. On the other hand, the black light is made black by closing the R, G, and B liquid crystal shutters so as to block all the light on the back side. For the intermediate color, light of each color of R, G, and B is adjusted by a liquid crystal shutter to generate light having a predetermined luminance and a predetermined hue. Therefore, with respect to the backlight, uniform light is generated over the entire surface of the image.

  However, in order to reduce the power consumption of the backlight of the liquid crystal display device, it is not always necessary to illuminate the backlight of the portion corresponding to the dark portion of the image. A method such as area control in which the luminous intensity is lowered has been proposed (see Japanese Unexamined Patent Application Publication Nos. 2011-29023 and 2010-91729).

  However, even with the conventional area control method, the power consumption cannot be sufficiently reduced. Also, it does not necessarily reduce the brightness of the backlight in unnecessary areas, but the hue or color deteriorates due to the light of the backlight emitted to the front side through the liquid crystal shutter part, and the color sharpness deteriorates. Or a black image is not always clearly displayed.

JP 2011-29023 A JP 2010-91729 A

  An object of the present invention is to provide a liquid crystal display device in which the brightness of the backlight in an unnecessary dark video region is lowered, and thereby the power consumption is surely reduced.

  Another object of the present invention is to provide a direct-type backlight type liquid crystal display device that is easy to manufacture and reduces the manufacturing cost.

  Still another object of the present invention is to provide a liquid crystal display device in which the hue and color are improved and the color is sharpened.

  Still another object of the present invention is to provide a liquid crystal display device in which blackness is improved and grayish black is not produced.

  Still another object of the present invention is to provide a liquid crystal display device in which the stereoscopic effect of an image is increased.

  Still another object of the present invention is to provide a liquid crystal display device suitable for use in a medical display device that requires a subtle color image.

  The above-described problems and other problems of the present invention will be made clear by the technical idea of the present invention described below and the embodiments thereof.

The main invention of the present application is a liquid crystal display device comprising a backlight on the back side of the liquid crystal display panel, and the liquid crystal display panel performs display according to a video signal with light from the backlight.
A light source of the backlight is arranged so as to correspond to a plurality of pixels of the liquid crystal display panel, and has control means for controlling the brightness of the light source of the backlight, and the brightness in the video signal is controlled by the control means. The present invention relates to a liquid crystal display device in which a light source of the backlight emits light with a brightness corresponding to a luminance level associated with a part or all of the plurality of pixels.

  Here, the control unit may control the light source of the backlight to emit light at a brightness corresponding to the brightness of a pixel located at the center of the plurality of pixels or in the vicinity thereof. The control unit may control the light source of the backlight to emit light with brightness corresponding to the average luminance of the plurality of pixels. The control unit may control the light source of the backlight to emit light at a brightness corresponding to the weighted average brightness of the plurality of pixels. In addition, a luminance signal extraction unit may be provided to extract the luminance signal from the video signal. The light source of the backlight may be composed of a plurality of LEDs, and all the LEDs may be arranged so that the number of corresponding pixels is equal to each other. In addition, all the LEDs may be connected to bipolar transistors, and the brightness of all the LEDs may be controlled independently of each other by controlling the bipolar transistors. Each of the bipolar transistors may be mounted on or formed on a substrate on which the LED is mounted.

The main invention of this application is:
In a liquid crystal display device comprising a backlight on the back side of the liquid crystal display panel, and the liquid crystal display panel performs display according to a video signal with light from the backlight.
A light source of the backlight is arranged so as to correspond to a plurality of pixels of the liquid crystal display panel, and has control means for controlling the brightness of the light source of the backlight, and the brightness in the video signal is controlled by the control means. The present invention relates to a liquid crystal display device in which a light source of the backlight emits light with a brightness corresponding to a luminance level associated with a part or all of the plurality of pixels.

  Therefore, according to the present invention, the liquid crystal display panel is illuminated from the back side by the backlight having the light source that emits light at the brightness corresponding to the luminance level associated with some or all of the plurality of pixels in the video signal. It becomes possible to do. According to such a configuration, for the black portion or dark color portion in the video, the light source of the backlight at that position becomes dark or does not shine. That is, illumination is performed from the back side with the backlight so that a rough black and white image is formed by the light source of the backlight. Therefore, it is possible to reduce the power consumption by suppressing the power consumption of the unnecessary portion of the light source. Also, in areas that are not bright, dark, or black, the backlight in that area becomes darker or no longer shines, so light that leaks from the back side through the liquid crystal shutter is reduced or eliminated, and hue or color does not blur. , The color becomes sharper. In the dark area or the black image portion, the light from the back side is extremely reduced, so that the black margin is improved and the image looks black. By improving the color and the image of the black part, the stereoscopic effect of the video is increased.

1 is a block diagram illustrating an overall configuration of a liquid crystal color television receiver including a liquid crystal display device according to an embodiment of the present invention. It is a disassembled perspective view of the liquid crystal display panel of the television receiver. It is a block diagram of the drive part of a backlight. It is a block diagram which shows especially a control part and a backlight drive part of the drive part of a backlight. It is a front view of the liquid crystal display device which shows the relationship between a backlight and a pixel. It is a principal part enlarged front view which shows the relationship between a backlight and a pixel. It is a circuit diagram of the drive circuit of LED. It is a circuit diagram of the drive circuit of LED of a modification.

  The present invention will be described below with reference to embodiments shown in the drawings. First, the overall configuration of a color television receiver including the liquid crystal display device of this embodiment will be described with reference to FIG. This television receiver is a three-wave digital television receiver that supports three broadcasts of terrestrial, BS, and 110-degree CS waves. A UHF antenna 11 and a BS / CS antenna 12 are provided on the front side. The front end unit 13 is connected to the front end unit 13 and the back end unit 14 is connected to the rear end side of the front end unit 13.

  In terrestrial digital broadcasting and BS / 110 degree CS digital broadcasting, digital data such as video and audio is transmitted through a predetermined channel by a modulation method suitable for each transmission path. In the front end unit 13, a channel selection unit 17, a transmission line decoding unit 18, and a TMCC receiving unit 19 are provided for terrestrial digital. The channel selection unit 17 extracts a modulation signal of a desired channel. The transmission path decoding unit 18 extracts digital data from the selected signal. For BS and 110 degree CS, a channel selection unit 21, a transmission path decoding unit 22, and a TMCC reception unit 23 are provided, and a signal of a desired channel is extracted by the same operation as the operation of the front end unit for terrestrial digital. I am doing so. The terrestrial digital signal and the BS · 110 ° CS signal are switched by the switch 24 and sent to the back-end unit 14.

  Next, the back end unit 14 will be described. The back-end unit 14 receives key information (EMM) multiplexed on the B-CAS card 27 and broadcast waves from the signals output from the transmission path decoding units 18 and 22 of terrestrial digital and BS / 110 degree CS digital broadcasts. , ECM, etc.), the descrambling unit 28 releases the scramble and extracts the MPEG-2TS signal.

  In the MPEG-2 demultiplexing unit 29, this TS signal is converted to i. In addition to outputting to the LINX (IEEE 1394) terminal, the PSI information and SI information transmitted by the section method are identified and separated by the PID of the TS header and output to the basic data decoder 30. The basic data decoder 30 constructs an EPG using SI information (SDT, EIT, BAT, TOT), controls the local transmission frequency of the front end unit 13, and selects PSI information to select a channel to be received. The network information of the program acquired from (PAT, PMT, NIT, CAT) is output to the microcomputer 31. Further, the TS packet of the program is extracted using the PID acquired from the PSI information, and the video / audio decoding unit 32 decodes the data of the video / audio signal.

  The decoded audio signal is amplified and output to the speaker 33 and also output to the optical digital audio output terminal. On the other hand, the video signal decoded by the video / audio decoding unit 32 is input to the video signal processing unit 34 and output to a display 35 including a liquid crystal display panel in a predetermined format. The video signal processing unit 34 outputs to the D terminal and the video terminal, and synthesizes signals such as data broadcasting and captions as necessary. Further, a luminance signal extraction unit 40 is connected to the video signal processing unit 34, and the brightness of the backlight 41 is controlled using the extracted luminance signal.

  The microcomputer 31 is connected to a remote control light receiving unit 37 to which signals for control operations such as channel selection are input. The microcomputer 31 is connected to a modem / LAN I / F 36.

  Next, a display 35 that forms an image by receiving a signal from the video signal processing unit 34 of the back-end unit 14 will be described with reference to FIG. The display 35 is composed of a liquid crystal display device. In FIG. 2, a TFT substrate 46 on which TFTs and pixel electrodes are arranged in a matrix, a scanning line, a video signal line, and the like and a counter substrate 47 on which a color filter and the like are formed are connected via an adhesive (not shown). Are glued together. A liquid crystal (not shown) is sandwiched between the TFT substrate 46 and the counter substrate 47.

  A rear polarizing plate 48 is attached to the rear side of the TFT substrate 47, and a front polarizing plate 49 is attached to the front surface of the counter substrate 47. A state in which the TFT substrate 46, the counter substrate 47, the rear polarizing plate 48, and the front polarizing plate 49 are bonded together is referred to as a liquid crystal display panel 35. A backlight 41 is disposed on the back side of the liquid crystal display panel 35. The backlight 41 includes a light source unit and various optical components.

  In FIG. 2, the backlight 41 includes a wiring board 51, and LED elements 52 that form a light source are mounted on the wiring board 51 in a predetermined arrangement. The LED element 51 has a chip shape, and its electrode portion is connected to the electrode portion of the wiring formed on the wiring substrate 51.

  A prism sheet 54 and a diffusion plate 55 are disposed between the liquid crystal display panel 35 and the backlight 41. The prism sheet 54 has a thickness of about 65 μm, for example, and has fine irregularities formed on its surface, which diffuses light incident through the diffusion plate 55. The fine irregularities on the surface serve as a kind of prism, and has a function of directing light incident obliquely to the prism sheet 54 toward the liquid crystal display panel 35.

  As shown in FIG. 3, the backlight 41 is obtained by mounting a predetermined number of LED elements 51 in a predetermined arrangement on the wiring board 12, and the wiring board 51 is substantially the same as the size of the liquid crystal display panel 35. It is structured in size. The LED 52 of the backlight 41 is driven by the video processing unit 34, the luminance signal extraction unit 40, the control unit 58, and the backlight driving unit 59 shown in FIG. A vertical interface 60 and a horizontal direction interface 61 are attached to the side of the wiring board 51, and are driven via these interfaces 60 and 61.

  The video signal processing unit 34 is provided in the back-end unit 14 of the television receiver shown in FIG. 1, where a video signal is created and supplied to the display 35. The luminance signal is extracted from the video signal extracted from the video signal processing unit 34 by the luminance signal extraction unit 40. The luminance signal is sent to the control unit 58, where a control operation necessary for driving each LED element 52 of the backlight 41 is performed, and the controlled output is sent to the backlight driving unit 59. The backlight drive unit 59 performs drive control with a current value according to a control signal sent from the control unit 58, and thereby drives each LED element 52 to have a predetermined brightness.

  Each LED element 52 of the backlight 41 is provided in association with each pixel of the display unit of the liquid crystal display panel 35. That is, the LED element 52 is arranged at the center of a region having a predetermined number of pixels in the vertical and horizontal directions. Corresponding to the number of pixels of the high-definition television set in the horizontal direction 1,920 × vertical direction 1,080, for example, the number of LED elements 52 of the horizontal direction 80 × vertical direction 45 is arranged. Therefore, one LED element 52 is arranged at the center of the area of 24 pixels in the horizontal direction and 24 pixels in the vertical direction. The area of 24 × 24 pixels is a corresponding area of one LED element 52 constituting the light source of the backlight 41. Each LED element 52 shines with brightness luminance corresponding to the luminance of the corresponding pixel pixel.

  Table 1 exemplarily shows the relationship between the number of LED elements 52 constituting the backlight and the arrangement thereof in liquid crystal display screens of various dimensions. In this table, θ is an irradiation angle of the LED element 52 and is a value indicating the degree of light opening. The number of LEDs indicates the number of LED elements 52 in the vertical and horizontal directions on the screen. The LED interval indicates an interval between adjacent LED elements 52 in the vertical direction and the horizontal direction. The total number of LEDs indicates the total number of LED elements 52 on one screen. The number of pixels / LED indicates the number of vertical and horizontal pixels corresponding to one LED element 52. Table 1 is merely an example and does not limit the scope of the present invention.

  In order to simplify the description now, the liquid crystal display panel 35 is a panel of 20 pixels wide × 10 pixels high as shown in FIG. The LED elements 52 are arranged one by one so as to correspond to a square area of 5 pixels wide × 5 pixels long. In this case, for example, the arrangement of the LED elements 52 at a position corresponding to 5 pixels wide × 5 pixels long in the upper left portion of the display panel 35 is as shown in FIG. Here, in the 25 pixel area of 5 horizontal pixels × 5 vertical pixels, the pixels in the top column are G1 to G5, the pixels in the second column are G6 to G10, and the pixels in the third column are G11 to G15. The pixels in the fourth column are G16 to G20, and the pixels in the fifth column are G21 to G25. Further, the luminance at a certain moment of the pixels G1 to G25 is defined as B1 to B25. As a result, the center of the LED element 52 arranged in the region of horizontal 5 pixels × vertical 5 pixels coincides with the center of the central pixel G13.

  When the control unit 58 that controls the backlight driving unit 59 in the driving circuit shown in FIG. 3 has the circuit configuration shown in FIG. 4A, the LED element 52 is the central pixel G13 in 25 pixels in FIG. The light is emitted with the brightness corresponding to the luminance B13 of the third central pixel G13 in the third vertical direction. That is, the central pixel luminance signal extraction unit 40 extracts the luminance B13 of the G13 pixel. The backlight drive signal generation unit 64 generates a drive signal with brightness according to the luminance B13 of the pixel G13, and sends the drive signal to the backlight drive unit 59 to drive the LED element 52. Therefore, in this case, the LED element 52 emits light with brightness corresponding to the luminance signal B13 of the pixel G13 at the center of 25 pixels.

  When the central portion of the pixel region corresponding to one LED element 52 is located at the boundary of a plurality of pixels, the pixel closest to the central portion is set in advance, or a predetermined pixel is set in advance. The luminance signal of the pixel may be extracted by the central pixel luminance signal extraction unit 40.

  In FIG. 4B, the average value of the pixels in the region corresponding to the LED element 52 is taken and emitted. Here, in the extraction of the luminance signal of the corresponding area of the LED element 52, the luminance signal extraction unit 40 extracts the luminance signals B1 to B25 of 5 × 25 × 25 pixels shown in FIG. Thereafter, the arithmetic unit 65 calculates the average value of the luminance signals B1 to B25 of the corresponding pixels. That is, the arithmetic average or geometric average shown in the following equations 1 and 2 is calculated by the calculation unit 65, and the backlight drive signal is generated by the signal generation unit 64 with the value obtained by this calculation. The corresponding LED element 52 is driven.

Arithmetic average (B1 + B2 + ... + B25) / 25 (1)
Geometric mean (B1 / B2 ... B25) ^1/25 (2)

  The configuration shown in FIG. 4C is to determine the brightness by performing a weighted average calculation of the corresponding area of 5 × 5 = 25 pixels in FIG. The luminance signal extraction unit 40 extracts the luminance signal of the corresponding region. For example, in the case of the configuration shown in FIG. 6, luminance signals B1 to B25 of horizontal 5 × vertical 5 = 25 pixels are extracted. Then, the arithmetic unit 66 performs a weighted average calculation of the luminance signals B1 to B25 of the 25 pixels. Here, the pixels G7, G8, G9, G12, G14, G17, G18, and G19 around the center pixel G13 are multiplied by a weight of 0.7, and the surrounding pixels G1, G2, G3, G4, G5, G6, G10, G11, G15, G16, G20, G21, G22, G23, G24, and G25 are multiplied by a weight of 0.3. An example of the weighted calculation is expressed by the following equation 3. The weighting factors 0.7 and 0.3 can be changed as appropriate.

    Weighted average {B13 + (B7 + B8 + B9 + B12 + B14 + B17 + B18 + B19) × 0.7 / 8 + (B1 + B2 + B3 + B4 + B5 + B6 + B10 + B11 + B15 + B16 + B20 + B21 + B22 + B23 + B24 + B25) × 0.3 / 16} × 1/3

  After performing the average calculation, the drive signal generation unit 64 generates a signal, and the backlight drive unit 59 is driven based on such a signal to control the lighting brightness of the LED element 52. ing.

  The luminance control as shown in FIGS. 4A, 4B, and 4C as described above is performed for all the LED elements 52 of the backlight 41 shown in FIGS. Therefore, the LED elements on the wiring board 51 emit light as if they were a monochrome television with few pixels.

  FIG. 7 shows a more specific configuration for driving the LED element 52 of the backlight 41 as described above. Here, the LED element 52 is connected to the subsequent stage of the control circuit 69 including the control IC via the interface 70. The same number of bipolar transistors 71 are connected. The individual bipolar transistors 71 drive and control the corresponding LED elements 52. Here, the control of the LED element 52 by the bipolar transistor 71 may adjust the current value applied to the LED element 52. Alternatively, this bipolar transistor 71 may control the pulse width by pulse width control (PWM). In any case, the LED element 52 emits light with brightness corresponding to the luminance of the pixel in the corresponding region. For this reason, the LED element 52 forms a black and white image with coarse pixels on the wiring board 51. It becomes like this.

  The bipolar transistor 71 may be arranged on the wiring board 51 on which the LED elements 52 are mounted so as to form a pair with each LED element 52. FIG. 6 shows a state where bipolar transistors 71 are arranged on the left side of the LED element 52. The bipolar transistor 71 is a chip-like transistor mounted on the wiring substrate 51. Instead of the chip-shaped transistor as described above, the bipolar transistor 71 can be formed on the wiring substrate 51 by the same film formation as the TFT.

  The configuration shown in FIG. 8 shows a configuration in which the plurality of LED elements 52 of the backlight 41 are controlled by the electronic switch 72 for each group. In this case, instead of controlling the individual LED elements 52 by the bipolar transistor 71, the grouped LED elements 52 are controlled by the electronic switch 72. The electronic switch 72 may control the plurality of LED elements 52 in a time-sharing manner, or the multiple electronic elements 72 can simultaneously control the plurality of LED elements 52 in the group. In this case, the light emission control for the LED element 52 may be current control or may be pulse width control (PWM).

  Since the liquid crystal display panel 35 having such a backlight 41 does not emit light particularly in a dark part or black part of an image, the power consumption is greatly reduced, and the power consumption is further lower than the area control. The configuration of the backlight according to the embodiment and shown in FIG. 7 is only required to dispose the LED element 52 and the transistor 71 on the wiring substrate 51, and the manufacturing cost is low. In particular, when the bipolar transistor 71 is used, it can be manufactured at low cost.

  In addition, when the backlight 41 of the present embodiment is used, the dark portion or black portion of the image formed by the liquid crystal display panel 35 is hardly irradiated with light from the back side. There is an advantage that almost no light leaks to the front side through the light, the hue and color are stabilized, and the color is sharpened. In addition, the black area of the image does not tend to be gray due to light leaking from the back side, and that portion becomes black. In addition, such a color effect and particularly the sharpness of the black portion make the image appear three-dimensional. Such a liquid crystal display device is suitable for use in a liquid crystal display panel for medical use that requires generation of an image with a subtle hue.

  Although the present invention has been described above with reference to the illustrated embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea of the present invention. For example, various changes can be made to the arrangement example of the LED elements with respect to the number of pixels in the above embodiment.

  The present invention can be used for a display panel of a liquid crystal color television receiver and various other liquid crystal display devices. In particular, the present invention is suitable for use in a large-sized and large-screen liquid crystal display device.

11 UHF antenna 12 BS / CS antenna 13 Front end unit 14 Back end unit 17 Channel selection unit 18 Transmission path decoding unit 19 TMCC reception unit 21 Channel selection unit 22 Transmission path decoding unit 23 TMCC reception unit 24 Switch 27 B-CAS card 28 Descramble Unit 29 MPEG-2 demultiplexing unit 30 basic data decoder 31 microcomputer 32 video / audio decoding unit 33 speaker 34 video signal processing unit 35 display (liquid crystal display panel)
36 Modem / LAN I / F
37 Remote control light receiving unit 40 Luminance signal extracting unit 41 Backlight 46 TFT substrate 47 Counter substrate 48 Rear polarizing plate 49 Front polarizing plate 51 Wiring substrate 52 LED element 54 Prism sheet 55 Diffuser plate 58 Control unit 59 Backlight drive unit 60 Vertical interface 61 Horizontal Interface 64 Backlight Drive Signal Generation Unit 65 Luminance Signal Average Value Calculation Unit 66 Luminance Signal Weighted Average Value Calculation Unit 69 Control Circuit 70 Interface 71 Bipolar Transistor 72 Electronic Switch

Claims (8)

In a liquid crystal display device comprising a backlight on the back side of the liquid crystal display panel, and the liquid crystal display panel performs display according to a video signal with light from the backlight.
A light source of the backlight is arranged so as to correspond to a plurality of pixels of the liquid crystal display panel, and has control means for controlling the brightness of the light source of the backlight, and the brightness in the video signal is controlled by the control means. A liquid crystal display device in which a light source of the backlight emits light with a brightness corresponding to a luminance level associated with a part or all of the plurality of pixels.   2. The liquid crystal display device according to claim 1, wherein the control unit controls the light source of the backlight to emit light at a brightness corresponding to the brightness of a pixel located at the center of the plurality of pixels or in the vicinity thereof.   The liquid crystal display device according to claim 1, wherein the control unit controls the light source of the backlight to emit light at a brightness corresponding to an average luminance of the plurality of pixels.   The liquid crystal display device according to claim 1, wherein the control unit controls the light source of the backlight to emit light at a brightness corresponding to the weighted average brightness of the plurality of pixels.   The liquid crystal display device according to claim 1, further comprising a luminance signal extraction unit, which extracts the luminance signal from the video signal.   The liquid crystal display device according to claim 1, wherein the light source of the backlight includes a plurality of LEDs, and all the LEDs are arranged so that the number of corresponding pixels is equal to each other.   The liquid crystal display device according to claim 6, wherein all the LEDs are connected to bipolar transistors, and the brightness of all the LEDs is controlled independently of each other by the control of the bipolar transistors.   The liquid crystal display device according to claim 7, wherein each of the bipolar transistors is mounted on or formed on a substrate on which the LED is mounted.

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