JP5280608B2 - Display device - Google Patents

Description

  The present invention relates to a display device that performs display with as little eye irritation as possible.

  In modern times, a display device is used in every workplace, and the display device is used for a very long time such as watching a display device as a television at home.

  And it is necessary to consider that the eye irritation does not become strong when using the display device, but guidelines have been created by the Ministry of Health, Labor and Welfare (Non-Patent Document 1).

  According to these guidelines, the brightness of light incident on the screen of the display device should be as small as possible. This means that so-called glare should be prevented. Glare is discomfort or difficulty in viewing due to an excessively bright spot in the field of view, and there are direct glare and indirect glare.

  As an example of the direct glare, as shown in FIG. 19A, there is so-called “reflection” in which lighting or the like in the living room is directly reflected on the display unit of the display device. When lighting or the like is reflected on the screen, it imposes a burden on the brightness adjustment function and the focusing function by the eyes, which causes eye fatigue. Other than that, too bright characters on the screen cause glare directly.

  As an example of indirect glare, as shown in FIG. 19B, extremely bright light near the display device that enters the field of view when the display screen is directly viewed can be cited. Also in this case, the extremely bright light near the display screen hinders direct viewing of the display screen, which is a burden on the eyes.

  On the other hand, viewing the display screen in a dark place has the fact that when the screen blinks greatly, the eye irritation becomes stronger and the eye fatigue level increases.

  Therefore, when using a display device, (1) make the lighting in the room as dark as possible to eliminate glare, and (2) illuminate the periphery of the display screen with indirect lighting that does not irritate the eyes. It can be said that it is preferable to reduce the burden caused by.

  Regarding (1) above, for example, as in Patent Document 1, the light color of the light source of the display device and the screen brightness are automatically adjusted so that the glare of external light reflected on the screen is not a concern. There is something to do.

  Further, in Patent Documents 2 and 3, the brightness in the vicinity of the display screen is detected so as to display characters and the like that are easy to see for the user of the display device in order to ensure visibility in consideration of changes in the characteristics of the human eye. I am trying to display the screen accordingly.

  In addition, although there is no direct relationship with the said subject, there exist many things which adjust the illumination around the installation place of a display apparatus according to the image | video displayed on a display apparatus like patent document 4 grade | etc.,.

  Further, regarding the above (2), in Patent Document 5, when a TV is viewed in a dark environment, blinking light with a large contrast on the TV screen not only gives a large stimulus to the eyes but also light. For people with hypersensitivity, it is possible that abnormalities in the brain waves may be caused, so the brightness around the TV receiver is detected, and if the brightness falls below a certain value during TV operation, the area around the TV receiver is lit. I try to drive it.

  A television lighting device described in Patent Document 5 is shown in FIG. The television illumination apparatus includes an illuminance sensor 201 and a television operation sensor 202. The illuminance sensor 201 detects the illuminance around the television receiver (or the room where the television receiver is placed) by a detection element such as a phototransistor. To do.

  When the detected illuminance is less than or equal to the illuminance set by the variable setting value of the adjustment resistor, the output is set to H level, and when the detected illuminance is greater than or equal to the set illuminance, the output is set to L level. On the other hand, the television operation sensor detects whether or not the television is in an operating state. When the television is on and in an operating state, the output is at an H level, and when the television is off, the output is at an L level.

  The outputs of the illuminance sensor 201 and the TV operation sensor 202 are connected to the input of the NAND gate 203, and the output of the NAND gate 203 becomes "L" only when the inputs from both sensors are "H". Sometimes, a load 204 such as lighting installed around the television receiver is turned on.

  Further, Non-Patent Document 2 discloses a display device that uses indirect illumination. A flat television 211 described here is shown in FIG. This flat television 211 is provided with RGB three-color elongated lighting 212 on both sides of the rear surface of the television. As a result, when the flat television 211 is installed on the wall, the light from the illumination 212 prepared on the back surface is reflected on the wall and plays the role of indirect illumination. In Non-Patent Document 2, this technique is called “Ambright”, and the tone of the color currently displayed on the TV screen is analyzed in real time, and a color close to that tone is automatically emitted. ing. 21B is an image diagram when the illumination 212 is turned off, and FIG. 21C is an image diagram when the illumination 212 is turned on and indirect illumination is used.

  By the way, when the display device is a liquid crystal display device, the configuration of the liquid crystal display device is to have a light source and irradiate light from the light source onto the liquid crystal panel to display an image. If it can be used effectively other than irradiating the liquid crystal panel, it is preferable to use it as much as possible.

  From this point of view, in Patent Document 6, the light leaked from the backlight of the liquid crystal display device is used for irradiation of a keyboard or the like, so that no new elements are added and power consumption is not increased. Even in the dark, it is possible to effectively illuminate the input means such as a keyboard without disturbing the surrounding people.

The liquid crystal display device described in Patent Document 6 is shown in FIG. A window 222 is formed on the back surface of the frame of the display device 221. Then, light from the backlight unit of the display device leaks from the window 222, and the leaked light is reflected by the reflecting mirror 223 attached to the stand that supports the display device to the display surface side of the display device. It becomes the light which irradiates the keyboard (not shown) arrange | positioned.
JP-A-6-149203 JP-A-6-214508 Japanese Patent Application Laid-Open No. 6-308991 JP-A-2-253503 Japanese Patent Laid-Open No. 11-224529 JP 2002-132378 A “Guidelines for Occupational Health Management in VDT Work” (Ministry of Health, Labor and Welfare) “Learn About Picture and Sound”, [online], PHILIPS, [Search May 16, 2005], Internet <URL: http://www.flattv.philips.com/index.cfm?event=main&cat_id=1&subcat_id = 2 & page = pg3 ##>

  As described above, in consideration of human influences, particularly the effects of eye irritation, when using a display device, it is preferable to make the living room as dark as possible and irradiate the periphery of the display screen with indirect illumination.

  Therefore, it is effective to use indirect illumination as in Non-Patent Document 2 in a dark room. In order to use indirect illumination as in Non-Patent Document 2 when using a display device in a dark room, as described in Patent Document 5, illuminance detection means and television operation It is conceivable to use detection means.

  However, when the display device is used in a dark room, it may be bothersome that the indirect illumination is always turned on. For example, when you tend to be deprived of concentration by other tasks such as preparing dinner while the display is displayed, the setting sun automatically dims and the indirect lighting around the display turns on automatically It feels annoying.

  Considering human rhythms in particular, it is very convenient and inconvenient for the user if the indirect illumination is turned on only in a specific scene such as at bedtime.

  In order to use the indirect illumination more effectively, it is preferable to set the illumination range to an appropriate range according to each scene. And by making it the indirect light of an appropriate range, the influence on eyes can be relieved more.

  Furthermore, depending on the type of display device, a special form of indirect illumination may be used. For example, in a liquid crystal display device, the backlight light may be used not only for video display but also as indirect illumination. .

  The present invention has been made from the above viewpoint, and provides a display device that takes into account eye irritation in an appropriate form.

A display device according to the present invention is a display device including a display unit that displays an image, and a light source that irradiates an irradiation target disposed on a side opposite to the image display surface of the display unit, Illuminance detection means for detecting the illuminance around the part, and control means for controlling whether to irradiate the irradiated object by controlling the light source, the control means is detected by the illuminance detection means When the illuminated illuminance is greater than a predetermined set value, the irradiated object is not irradiated with light, and when the detected illuminance is less than the set value, the irradiated object is irradiated with light. The lighting intensity of the light source is controlled and the screen brightness of the display unit is reduced .

Display device according to the present invention, the illuminance detecting means, the illuminance in the periphery of the above display unit detected by the illuminance level of a plurality of stages, the control means, the illuminance detected by the illuminance detecting means less before SL setpoint In this case, the intensity of light applied to the irradiated object by the light source is controlled according to which illuminance level of the plurality of steps the illuminance detected by the illuminance detection means is.

Display device according to the present invention includes a time detection means for detecting the current time, said control means detects the time detection means when the detected illuminance of the following pre-Symbol set value by the illuminance detecting means Based on the result, the intensity of light applied to the irradiated object by the light source is controlled.

The display device according to the present invention is capable of forcibly controlling whether or not to irradiate the irradiated object by the light source according to a user instruction regardless of the control by the control means.

A display device according to the present invention is a display device including a display unit that displays an image, and a light source that irradiates an irradiation target disposed on a side opposite to the image display surface of the display unit, Illuminance detection means for detecting the illuminance around the part, and control means for controlling the irradiation range of the light to the irradiated object by the light source, wherein the control means has the illuminance detected by the illuminance detection means. The lower the range, the wider the irradiation range of the light to the irradiated object by the light source.

In the display device according to the present invention, the illuminance detection unit detects the illuminance around the display unit at a plurality of levels of illuminance, and the control unit detects the illuminance detected by the illuminance detection unit at the plurality of levels of illuminance level. The irradiation range of light to the irradiated object by the light source is controlled according to which level of the light source.

A display device according to the present invention is a display device that includes a display unit that displays an image, and a light source that irradiates an irradiated object that is disposed on a side opposite to the image display surface of the display unit. A time detection means for detecting time; and a control means for controlling an irradiation range of light to the irradiated object by the light source, wherein the control means has a current time detected by the time detection means in advance. The closer to a predetermined time, the wider the irradiation range of light to the irradiated object.

The display device according to the present invention is characterized in that the predetermined time can be set by a user.

The display device according to the present invention is characterized in that the irradiation range of light to the irradiated object by the light source can be forcibly controlled by a user instruction regardless of the control by the control means.

  According to the present invention, the display device can be used with little eye irritation, and the user is not troubled when using the display device.

  Further, the display device can be used in a more appropriate state in consideration of eye stimulation according to the usage scene.

  In addition, depending on the type of display device, the above-mentioned merit can be obtained without causing extra power consumption.

  A display device according to the present invention will be described with reference to FIGS.

  FIG. 1 is a block diagram of a display device, and FIG. 2 is an external view of the display device. The display device includes a display unit 11 that displays video and images, and an illumination 12 that is attached to the back side of the display unit 11 as shown in FIG. The illumination 12 irradiates an object to be irradiated such as a wall surface disposed on the back surface of the display device in a predetermined installation state of the display device.

  And the said display apparatus is provided with the illumination intensity detection part 14 and the time detection part 15, and the illumination intensity detection part 14 is provided in the predetermined position of the display part 11 like FIG. The brightness of the neighborhood is detected. The time detection unit 15 detects the time of the time output unit 16 built in the display device, and detects the current time. Then, the control unit 17 controls turning on / off of the illumination 12 based on the detection results from the illuminance detection unit 14 and the time detection unit 15.

  FIG. 3 is a block diagram illustrating an example of the configuration of the illuminance detection unit 14.

  In FIG. 3, a BRT signal, which is a result of detecting the brightness around the display unit by an illuminance sensor or the like, is input to the discriminator 31, and is compared with a predetermined threshold 32. For example, when the value of the BRT signal is larger than the value of the threshold value X, the LGT signal is output as High, and when the value is lower, the LGT signal is output and the output result is sent to the control unit 17. This threshold value X can be set by a user instruction or the like.

  The control operation in the display device as described above will be described with reference to the flowchart of FIG. First, the time detection unit 15 obtains current time information from the time output unit 16 (S41). Then, it is determined whether or not the current time is between T1 and T2 (S42). These T1 and T2 are predetermined times. For example, the time zone T1 = 21 o'clock at night and T2 = 4 o'clock are determined. Here, if the current time is not between 21:00 and 4 o'clock, the illumination 12 on the back surface of the display device is not turned on (S45).

  In S42, when the current time is between 21:00 and 4 o'clock, when the brightness detection result around the display unit 11 detected by the illuminance detection unit 14 is X or less (S44), the illumination 12 is turned on. In this manner, the control unit 17 controls (S46). The threshold value X is assumed to be a value assuming the indoor brightness at night when only the TV is turned on, and is set to 10 lx, for example. In S44, when the detection result by the illuminance detection unit 14 is 10 lx or more, the illumination 12 is not turned on (S45).

  That is, when the illuminance detection unit 14 outputs a Low signal, it indicates that the illuminance detection unit 14 can be turned on, and when the current time detected by the time detection unit 16 is within a predetermined range of time, When the time detection unit 16 is in a state that can be turned on, and both the illuminance detection unit 14 and the time detection unit 16 are in a state that can be turned on, the lighting 12 is controlled to be lit.

  As described above, the display device according to the above configuration is, for example, in the bedtime period, and only when it is determined that the room is in the sleeping state by turning off the general lighting of the room, the illumination 12 on the back surface of the display unit 11. Is turned on to irradiate the irradiated object located behind the display device, thereby performing display using light of indirect illumination (FIG. 5).

  With such a configuration, the stimulation to the eyes by the display device in the dark at the time of sleeping etc. is softened using the light of the indirect lighting, and the indirect lighting is turned on only at the time of sleeping etc. Thus, it is possible to form a rhythm suitable for human beings such that the indirect illumination is lit only, and the inconvenience that the illumination 12 is always lit in the dark can be avoided.

In addition, it is preferable to be able to change the said time slot | zone according to a user's individual circumstances, and for the user who has the rhythm of going to bed in the morning by night work, the setting of the time T1, T2 in the time detection unit 15 is It may be set according to circumstances. In this case, the threshold value X of the illuminance detection unit 14 may be set higher so that it can be detected that the person is sleeping even in the morning.

For example, if the display device stores a plurality of control patterns as shown in Table 1, the user can use indirect illumination with a favorite pattern. In the above description, the case of pattern 1 has been described as an example. Pattern 2 is a pattern suitable for a user who mainly works at night shift, and pattern 3 is a pattern selected when it is desired to recognize that it is nighttime in a wide time zone.

  In addition, the arrow shown with the dotted line from the control part 17 of FIG. 1 to the display part 11 is based on the detection result of the illumination intensity detection part 14 and the time detection part 15, and when the circumference | surroundings of the display part 11 are dark at night time zone. In addition to the control for turning on the illumination 12, the control for reducing the screen brightness may be performed. If this control is added, the influence on the eyes caused by blinking in the display unit 11 can be further alleviated.

<Second Embodiment>
Next, a second embodiment will be described with reference to FIGS.

  The block diagram of the display device according to this embodiment is the same as that of FIG. 1 shown in the first embodiment, but the configuration of the illuminance detection unit 14 is different. The control operation of the control unit 17 is also different from that of the first embodiment.

  FIG. 6 shows a block diagram of the illuminance detection unit 14 according to the present embodiment. The illuminance detection unit 14 inputs a BRT signal detected by an illuminance sensor or the like to the two comparators 1 (63) and 2 (65) and compares them with predetermined thresholds ma and mb, respectively. .

  The comparator 1 compares the input BRT signal with a preset threshold value ma, and outputs the comparison result to the discriminator 67 as a CMP-A signal. For example, when the CMP-A signal exceeds the threshold value ma, a High (hereinafter referred to as “H”) signal is output, and when not exceeded, a Low (hereinafter referred to as “L”) signal is output.

  Similarly, the comparator 2 compares the input BRT signal with a preset threshold value mb, and outputs the comparison result to the discriminator 67 as a CMP-B signal. For the CMP-B signal, for example, a signal of “H” is output when the threshold value mb is exceeded, and an “L” signal is output when it does not exceed the threshold value mb.

  The discriminator 67 receives the CMP-A signal and the CMP-B signal, calculates an LGT signal that is a three-stage illuminance detection result from both signals, and outputs the discrimination result. For example, when the CMP-A signal is “H” and the CMP-B signal is “H”, “bright”, when the CMP-A signal is “L”, and when the CMP-B signal is “H”, “dim”, When the CMP-A signal is “L” and the CMP-B signal is “L”, it is determined as “dark” or the like, and a signal (“H”, “M”, “L”, etc.) that can identify a plurality of levels. (For example, in the above calculation method, ma> mb is assumed, and the CMP-A signal is not “L” and the CMP-B signal is “H”.) .

  As described above, in this embodiment, illuminance detection of two systems with different threshold values is performed, and the illuminance level is detected in three stages. From the detection result of the illuminance by the illuminance sensor or the like, the LGT signal takes three values such as “bright”, “dim”, and “dark”. The illuminance detection unit 14 outputs this BRT signal to the control unit 17.

  For example, assuming that ma = 10 and mb = 3 (lx), when a 40 (lx) BRT signal is input, the CMP-A signal is output as “H” and the CMP-B signal is output as “H”. Therefore, it is judged as “bright” and an “H” LGT signal is output.

  Further, for example, when a 5 (lx) BRT signal is input, the CMP-A signal is output as “L” and the CMP-B signal is output as “H”. The LGT signal is output.

  In the display device according to the present embodiment having the illuminance detection unit 14 as described above, the control unit 17 performs lighting control of the illumination 12 based on the time detection result and the illuminance detection result, as shown in the flowchart of FIG.

  First, the time detection unit 15 obtains current time information from the time output unit 16 (S71). Then, it is determined whether or not the current time is between T1 and T2 (S72). For example, if it is assumed that T1 = 21: 00 and T2 = 4 o'clock, the illumination 12 on the back surface of the display device is not turned on unless the current time is between 21:00 and 4 o'clock (S78).

  In S72, when the current time is between 21:00 and 4 o'clock, the brightness detection result (LGT signal) around the display unit 11 detected by the illuminance detection unit 14 is “L” (illuminance detection unit 14), the illumination 12 is turned on strongly (S74 → S75 → S76), and when it is “M” (when the illuminance detection unit 14 determines “dim”), The illumination 12 is turned on weakly (S74 → S75 → S77). On the other hand, when the LGT signal is “H” (when the illuminance detection unit 14 determines “bright”), the illumination 12 is not turned on (S74 → S78).

  In the above description, the LGT signal is output in three stages such as “bright”, “dim”, and “dark”. However, the threshold is further increased so that the LGT signal is output in four or more stages. Good. By doing so, finer control becomes possible, and the irradiation level of the illumination 12 can be finely adjusted.

  Further, as described in the first embodiment, the time for turning on the illumination 12 may be selected according to a user instruction from a plurality of predetermined setting patterns.

  According to the configuration as described above, in addition to the effects obtained in the first embodiment, the light of indirect illumination is strengthened as the illuminance around the display device becomes darker. Can prevent eye fatigue.

  In the above configuration, the illumination result of the illumination 12 is controlled in multiple stages by outputting the detection result of the illumination detection unit 14 in a plurality of stages, but the illumination 12 is controlled according to the detection result of the time detection unit 15. The illuminance may be controlled in a plurality of stages.

  For example, if the user has a rhythm that normally enters a sleeping place around 23 and goes to sleep while watching a TV (display device), all lights other than the display device in the room are turned off around 23:00. Therefore, the illumination 12 on the back of the display device is strongly lit around 23:00 (for example, from 22:00 to 24:00), the indirect light is strengthened, and the use of the display device in the dark is a strong stimulus to the eyes. It should be set so that it does not. And the time zone (for example, 20:00 to 22:00, 24:00 to 4 o'clock) that is determined to be nighttime is a time zone that is outside the time zone around 23:00 (22:00 to 24:00) is 23:00. It is preferable to set so that the light is lit at an intensity lower than the intensity of the light of the illumination 12 in the preceding and following time zones.

  This will be described with reference to the flowchart of FIG. First, the illuminance detection unit 14 detects the illuminance around the display unit 11. If the detected illuminance is X (for example, 10 lx) or more, the illumination 12 is not turned on (S86), and if it is X or less, the time detection result of the time detector 15 is continuously referred to (S83). If it is determined that the referenced time is between T1 and T2 (in the above example, 20:00 to 4 o'clock) (“Y” in S84), T3 to T4 (in the above example, 22:00) ˜24 o'clock) (S85). When it is determined that the current time is between T3 and T4 ("Y" in S85), the illumination 12 is controlled to be lit strongly (S88), and when it is determined that it is between T3 and T4 (“N” in S85) is controlled to turn on the illumination weakly (S87). On the other hand, when it is determined in S84 that the current time is not between T1 and T2, the illumination 12 is not turned on (S86).

  With the control as described above, even when the display device is used for a long time, it is possible to use the indirect light by the appropriate illumination 12 that does not increase the burden on the eyes according to the user's bedtime.

  Note that the settings of the above T1 to T4 vary depending on the life rhythm of the user. For example, as shown in Table 2, a plurality of patterns may be prepared in advance so that the user can select them.

Further, as exemplified by the pattern 3, the light intensity level is not limited to the two levels of “strongly lit” and “weakly lit”, so that the light emission of the illumination 12 is controlled with three or more levels of lighting intensity. It may be.

Furthermore, the control for changing the emission intensity of the illumination 12 stepwise according to the detection result of the illuminance detection unit 14 and the control for changing the emission intensity of the illumination 12 stepwise according to the detection result of the time detection unit 15. When the combined control of finer light emission intensity is possible, fatigue to the user's eyes can be reduced by fine adjustment of the illumination 12 more appropriately.

<Third Embodiment>
Subsequently, a display device according to a third embodiment of the present invention will be described with reference to FIGS. 9 to 13. FIG. 9 is a block diagram illustrating the display device according to the present embodiment, and FIG. 10 is an external view of the display device. Similar to the first embodiment, the display device includes a display unit 11 that displays video and images, and an illumination 12 (FIG. 10B) attached to the back side of the display unit 11. The illumination 12 plays a role of generating indirect illumination when viewing the display unit 11 by irradiating an irradiated object such as a wall surface disposed on the back surface of the display device in a predetermined installation state.

  In addition, the display device includes an illuminance detection unit 14, and the illuminance detection unit 14 is provided at a predetermined position of the display unit 11 as shown in FIG. To detect.

  The display device according to the present embodiment includes a light shielding unit 90. As shown in the rear view of the display device in FIG. 10B, the light shielding unit 90 includes an upper light shielding piece 101 and a lower light shielding piece 102 that regulate irradiation in the upper direction and the lower direction by the illumination 12, and from the rear surface. The left light-shielding piece 103 and the right light-shielding piece 104 are configured to restrict irradiation by the illumination 12 in the left direction and the right direction as viewed. Note that the upper light shielding piece 101 and the lower light shielding piece 102 provided in each of the two illuminations 12 may be made common as shown in FIG. 11 as one upper light shielding piece 111 and a lower light shielding piece 112.

  Each of these light-shielding pieces is provided so as to stand upright in the cabinet on the back surface of the display unit 11, and is tilted in the opposite direction (outward) from the illumination 12 side from the standing state of this light-shielding piece. The irradiation restriction of the illumination 12 by the light shielding piece is eliminated, and the irradiation range of the illumination 12 is widened.

  The control unit 17 controls the light irradiation range by the illumination 12 by controlling the light shielding unit 90 based on the detection result of the illuminance detection unit 14.

  FIG. 12 is another configuration example of the light shielding unit 90 that regulates the irradiation of light of the illumination 12, and includes four upper long pieces 121, a lower long piece 122, a left long shape in the cabinet on the back of the display unit 11. A piece 123 and a right long piece 124 are provided so as to stand upright and surround the illumination 12.

  Each long piece is provided with a predetermined number of light transmission holes 125, and each light transmission hole 125 is provided with a shutter 126 for opening the light transmission hole 125. In FIG. 12, an image when the upper long piece 121 is tilted outward is schematically shown, and each of the shutters 126 can be controlled independently so that a fine light irradiation range and irradiation amount can be controlled. It can be controlled.

  Since the light irradiation range and light irradiation amount can be adjusted by opening and closing each of these shutters, the display device can be used with appropriate indirect illumination. Note that the control of the shutter 126 may be performed in units of each long piece, and in that case, the control becomes easy.

  FIG. 13 is a flowchart showing the operation of the display device according to the present embodiment.

  First, the illuminance detection unit 14 detects the illuminance around the display unit 11 (S131), and determines whether the illuminance is X or less (S132). If the illuminance is greater than X, the illumination 12 is not turned on (S134). If the illuminance is less than or equal to X, it is further determined whether or not the illuminance is less than or equal to Y. If the illuminance is less than or equal to Y, the light shielding unit 90 is controlled to reduce the range in which the illumination 12 is shielded, Increase the light irradiation range. On the other hand, if the illuminance is greater than Y in S133, the light shielding unit 90 is controlled to increase the range of shielding the illumination 12 and reduce the light shielding range.

  With the operation as described above, the darker the brightness around the display unit, the larger the irradiation range of the light to the irradiated object by the illumination 12, and the use of the display device by appropriate indirect illumination irradiation becomes possible. .

  Subsequently, a modification of the present embodiment will be described with reference to FIGS. This modification includes a time output unit 16 and a time detection unit 15 as in the first and second embodiments. The control unit 17 controls the light shielding unit 90 not only based on the detection result of the illuminance detection unit 14 but also based on the detection result of the time detection unit 15.

  The operation of the display device having such a configuration will be described with reference to the flowchart of FIG.

First, the time information output by the time output unit 16 is detected by the time detection unit 15 (S151), and it is determined whether or not the detected current time is between T1 and T2 (S152). At this time, if the current time it detects is not between T1~T2, the illumination 12 is not lit (S156), if the detected present time is between T1~T2 is followed by the illuminance detecting unit 14 Thus, the illuminance around the display unit 11 is detected (S153). If the detected illuminance is X or less (S154), it is determined whether the illuminance is Y or less (S155). If the illuminance is Y or less, the light shielding unit 90 is controlled to reduce the light shielding range. By doing so, the irradiation range of the illumination 12 is increased. On the other hand, if it is determined in S155 that the illuminance is greater than Y, the irradiation range of the illumination 12 is reduced by increasing the light shielding range. If the illuminance detected by the illuminance detection unit 14 in S154 is greater than X, the illumination 12 is not turned on.

  According to the above, as the brightness around the display portion is darker, the irradiation range of the light to the irradiated object by the illumination 12 becomes larger, the display device can be used by appropriate indirect illumination, and for example, sleeping By setting the indirect lighting to be turned on only at times, a human-friendly rhythm can be formed that the indirect lighting is turned on only at bedtime, etc., and the illumination 12 is always turned on in the dark. Can be avoided.

  In the above example, the example in which the light shielding range is switched in two stages has been described. However, the light shielding range may be switched in three or more stages by providing three or more illuminance thresholds.

  Moreover, although the example which switches the light-shielding range by the detection result of an illumination intensity was shown in the said example, as shown in 2nd Embodiment, you may make it stepwise according to the detection result of the time detection part 15 (FIG. 8). reference). In this way, the illumination range can be maximized during the bedtime, and the irradiation range can be increased in the time zones before and after the bed as it is closer to the bedtime. Moreover, you may make it control finely combining these.

<Fourth Embodiment>
Next, a case where a liquid crystal display device is used as the display device will be described. 16 and 17 are external views of the display device according to this embodiment.

  FIG. 16A is a side sectional view of the display device. It has a plurality of fluorescent tubes 162 as light sources and is housed in a housing 160. Various optical members 163 are mounted on the front surface of the housing 160, and images and images are further displayed on the front surface. A liquid crystal panel 161 for display is provided. FIG. 16B is a view of the display device as viewed from the front with the liquid crystal panel 161 and the optical member 163 removed, and a plurality of fluorescent tubes 162 are arranged at equal intervals substantially in parallel with the horizontal direction. (A backlight device that is used to display images by illuminating the liquid crystal panel 161 on the front surface with the fluorescent tubes 162 laid out at equal intervals in this manner is called a direct backlight device).

  In the display device according to the present embodiment, a part of the material forming the upper side surface and the lower side surface of the housing 160 is formed of a light transmissive material that transmits light emitted from the fluorescent tube 162 (light transmissive portion). 164). And the upper side and lower side of the casing are directed to the rear side so that the upper and lower sides of the casing appropriately irradiate the irradiated object arranged on the rear side of the display device. It has an inclination in the direction of the equipartition line (line A in FIG. 16A) perpendicular to the lower surface. That is, the upper side surface of the housing is inclined to the rear side of the apparatus so as to have a horizontal direction and a depression angle, and the lower side surface is inclined to have a horizontal direction and an elevation angle on the rear side of the apparatus (note that the inclination is inclined). Even if it does not have, it is possible to irradiate the irradiated object arranged in the display device by the light diffusing action, and it has an effect as a temporary indirect illumination).

  The light transmission part 164 is formed of a resin such as milky white acrylic. If the light transmission part 164 is such a color, the light from a light source can be converted into a gentle soft light, and it can become appropriate as indirect light. Further, the light transmitting portion 164 may be an off-white color or the like, and the material may be glass or the like. In short, from the viewpoint of relieving eye irritation, it is important not to be too dazzling light but to be suitable as indirect illumination.

  Then, as shown in the first to third embodiments, the display device according to the present embodiment uses the illuminance around the display device and the current time to control the on / off of the indirect illumination, the lighting intensity, and the lighting range. In order to perform this, a shutter 165 as a light transmission control unit is provided so that transmission control of the light transmission unit 164 by the light emitted from the fluorescent tube 162 can be performed.

  Specifically, a light transmission hole 166 is provided at a position on the reflection plate 168 provided inside the housing facing the light transmission portion 164 provided in the housing 160, and is emitted from the light source 162. The leaked light passes through the light transmitting hole 166 and the light transmitting portion 164 and leaks to the outside of the housing 160. The shutter 165 is provided so as to open the light transmission hole 166 provided in the reflecting plate (FIG. 16 (c). In FIGS. 16 (a) and 16 (b), for convenience of explanation. Therefore, the reflector is not shown). The shutter 165 can be controlled so that light from the fluorescent tube 162 is not transmitted outside the housing 160 by sliding along the upper surface of the reflection plate 167 so as to close the light transmission hole 166.

  The reflecting plate 167 is used to reflect the light from the fluorescent tube 162 and guide the light to the liquid crystal panel 161 without waste. Therefore, it is essential to make a hole in the reflecting plate 167. It is not preferable for the purpose. Therefore, the shutter 165 is formed of the same material as the reflector 167 so that the light from the light source can be reflected and guided to the liquid crystal panel 161 without waste in a state where the light transmission hole 166 of the reflector 167 is closed. In FIG. 16C, the shutter 166 is shown in black and the reflecting plate 167 is shown in white, but this is for convenience of explanation, and both of them easily reflect white light. Are preferred).

  With the configuration as described above, light from the light source can be leaked to the outside of the housing 160, and as a result, whether or not to irradiate the irradiated object outside the housing 160, how much It will be possible to control the intensity and range of irradiation.

  As described above, if the display device that implements the first to third embodiments is a liquid crystal display device, the light of the light source provided in the liquid crystal display device is also used as light for indirect illumination. Thus, like the illumination 12 shown in the first to third embodiments, the invention of the first to third embodiments can be realized without providing a new light source outside.

  Note that when a part of the light source in the backlight device leaks to the outside, the amount of light used to display an image on the liquid crystal panel 161 is reduced, and the display image becomes slightly dark. As shown in the third embodiment, indirect lighting is used mainly in a dark room. In a dark room, it is desirable to reduce the screen brightness, both in terms of sharpness of the video display and eye irritation. Therefore, even if the light usage efficiency is slightly reduced by leaking the backlight, The problem does not occur. Then, like the illumination 12 shown in the first to third embodiments, power consumption and manufacturing cost can be reduced considering that a new light source is separately provided outside.

  FIG. 17 is an image diagram when using indirect illumination using the display device according to the present embodiment. Here, not only the upper side surface and the lower side surface of the housing 160 but also the light transmission parts 164 are formed on both side surfaces.

  Note that the configuration of the light transmission portion 164 and the light transmission hole 166 is not limited to the hole shape shown in FIG. 16C, and the light transmission portion 164 includes a housing as shown in FIG. A light transmission groove 186 may be provided on the upper surface of the body 160 in a line shape, and a light transmission groove 186 may be provided at a position of the reflecting plate 168 facing the body 160, and the groove may be controlled by a shutter.

  Even with such a configuration, indirect light can be used with an image as shown in FIG.

  Further, in the present embodiment, the case where the backlight device is a direct type backlight device has been described. However, even if the backlight device is a side edge type backlight device, the intended effect of the present invention can be obtained.

  While the present invention has been described with a plurality of embodiments, modifications can be made without departing from the spirit of the present invention.

  For example, the time output unit 16 may not be built in the display device, and may be an external time output unit. Furthermore, the time output unit 16 may be eliminated, and the time information transmitted simultaneously with the television signal may be received directly by the time detection unit 15 to obtain the time information.

The illumination 12 is not particularly limited as long as a plurality of colors capable emitting light, such as by a user setting, if you to select the color of the indirect light, is excellent as the interior. Moreover, the illumination 12 does not need to be a fluorescent tube, and may be a light emitter such as an LED.

  In order to improve usability, in all the embodiments, it is only necessary to forcibly set the lighting 12 on / off, lighting intensity, and lighting range in accordance with a user instruction.

  The present invention is applicable to a display device such as a television receiver.

1 is a block diagram of a display device according to a first embodiment of the present invention. 1 is an external view of a display device according to a first embodiment of the present invention. It is a block diagram of the illumination intensity detection part of the display apparatus which concerns on the 1st Embodiment of this invention. It is a flowchart which shows operation | movement of the display apparatus which concerns on the 1st Embodiment of this invention. It is an image figure when using the display apparatus which concerns on the 1st Embodiment of this invention. It is a block diagram of the illumination intensity detection part of the display apparatus which concerns on the 2nd Embodiment of this invention. It is a flowchart which shows operation | movement of the display apparatus which concerns on the 2nd Embodiment of this invention. It is a block diagram of the illumination intensity detection part of the display apparatus which concerns on the other example of the 2nd Embodiment of this invention. It is a block diagram of the display apparatus which concerns on the 3rd Embodiment of this invention. It is an external view of the display apparatus which concerns on the 3rd Embodiment of this invention. It is an external view of the display apparatus which concerns on the other example of the 3rd Embodiment of this invention. It is an external view of the display apparatus which concerns on the other example of the 3rd Embodiment of this invention. It is a flowchart which shows operation | movement of the display apparatus which concerns on the 3rd Embodiment of this invention. It is a block diagram of the display apparatus which concerns on the modification of the 3rd Embodiment of this invention. It is a flowchart which shows operation | movement of the display apparatus which concerns on the modification of the 3rd Embodiment of this invention. It is an external view of the display apparatus which concerns on the 4th Embodiment of this invention. It is an image figure when using the display apparatus which concerns on the 4th Embodiment of this invention. It is an external view of the display apparatus which concerns on the other example of the 4th Embodiment of this invention. Is an image diagram for explaining a grayed rare. It is a block diagram of a display device according to Patent Document 5. Flat TV appearance described in Non-Patent Document 2, an image view. It is an external view of a display device according to Patent Document 6.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Display part 12 Illumination 14 Illuminance detection part 15 Time detection part 17 Control part 90 Light-shielding part

Claims (9)

A display device comprising: a display unit that displays an image; and a light source that irradiates an irradiated object disposed on a side opposite to the image display surface of the display unit,
Illuminance detecting means for detecting illuminance around the display unit;
Control means for controlling whether to irradiate the irradiated object by controlling the light source;
The control means does not irradiate the irradiated object with light when the illuminance detected by the illuminance detection means is larger than a predetermined set value, and when the detected illuminance is less than the set value, A display device, wherein the lighting intensity of the light source is controlled so as to irradiate the irradiated body with light, and the screen brightness of the display unit is reduced . The illuminance detection means detects the illuminance around the display unit at a plurality of illuminance levels,
Wherein, by the light source depending on whether the illuminance illuminance detected by the illuminance detecting means is detected by the illuminance detecting means when the following pre SL setpoint are in which illumination level of said plurality of stages The display device according to claim 1 , wherein the intensity of light applied to the irradiated object is controlled. Having time detection means for detecting the current time;
The control means, that the illumination illuminance detected by the detection means controls the intensity of the infrared radiation the the irradiated body by the light source based on a detection result of said time detection means when the following pre SL setpoint The display device according to claim 1 . Display device according to any one of claims 1 to 3, wherein the possible forcibly controlling whether to irradiate the object to be irradiated by the light source by the user instruction irrespective of control by said control means . A display device comprising: a display unit that displays an image; and a light source that irradiates an irradiated object disposed on a side opposite to the image display surface of the display unit,
Illuminance detecting means for detecting illuminance around the display unit;
Control means for controlling an irradiation range of light to the irradiated object by the light source;
Have
The display device is characterized in that the control means widens the light irradiation range of the light source by the light source as the illuminance detected by the illuminance detection means is lower. The illuminance detection means detects the illuminance around the display unit at a plurality of illuminance levels,
The control means controls a light irradiation range to the irradiated object by the light source according to which of the plurality of illuminance levels the illuminance detected by the illuminance detection means is. The display device according to claim 5 . A display device comprising: a display unit that displays an image; and a light source that irradiates an irradiated object disposed on a side opposite to the image display surface of the display unit,
Time detection means for detecting the current time;
Control means for controlling the irradiation range of light to the irradiated object by the light source,
The control means, a display apparatus characterized by widening the irradiation range of light to the detected The closer to a predetermined time the current time the irradiation object by the time detection means. The display device according to claim 7 , wherein the predetermined time can be set by a user. Display device according to any one of claims 5-8, characterized in that capable of controlling the irradiation range of the light to the irradiated body by forcibly the light source in response to an instruction of the user regardless of the control by the control means .