JPH06148600A - Electronic apparatus with liquid crystal display device - Google Patents

Abstract

PURPOSE:To prolong the lifetime of a light emitting element and save the power consumption by deciding an optimum lightness by a photo-quantity control means from the sensing results of the operating condition and the lightness around the apparatus, and thereupon controlling the output photo-quantity of the back-light. CONSTITUTION:The surrounding lightness is sensed by an ambient lightness sensing part 21 having a visible ray sensor 21a while the information on key operation is sensed by a key entry operation sensing part 22, and the door 2 opening/closing operation is sensed by a door open/close switch 23a and an open/close door On/Off sensing part 23, and the clock information is acquired by a clock information sensing part 24. A timer recording under-execution sensing part 25 acquires timer recording information, while an external appliance communication information sensing part 26 seeks the information whether communications of signals with any external appliance take place, and a power switch 27a and a power On/Off sensing part 27 take in the On/Off sensing information about the power switch. Further a person sensing part 29 having an infrared sensor 29a acquires person sensing information. Therein a microprocessor 14 passes the total judgement from these pieses of information and controls the output photo-quantity of the back-light 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device having a liquid crystal display device with a backlight, and more particularly, to comprehensively determine the output light amount of the backlight of the liquid crystal display device, the ambient brightness and the usage state of the device. The present invention relates to an AV device that judges and controls.

[0002]

2. Description of the Related Art An example of a conventional liquid crystal display device for controlling the light quantity of a backlight will be described.

FIG. 4 is a diagram showing an example of a conventional liquid crystal display device for controlling the light quantity of a backlight, which is disclosed in Japanese Patent Laid-Open No. 3-2.
35985.

In FIG. 4, the ambient brightness of the liquid crystal display device is detected by the ambient brightness detection section 45, and the detection signal is sent to the backlight brightness control section 44. The backlight brightness control unit 44 calculates the optimum brightness of the backlight 42 in accordance with the ambient brightness. Based on this calculation result, the backlight brightness control section 44 sends a light quantity control signal to the backlight drive section 43 to control the output light quantity of the backlight 42 placed behind the liquid crystal display panel 41.

In the example shown in FIG. 4, the brightness of the backlight 42 is automatically adjusted according to the change in ambient brightness, and the brightness is maintained in an optimum state at any time.

Further, in the liquid crystal display device disclosed in Japanese Patent Laid-Open No. 3-249622, in addition to the first light receiving element for detecting the ambient brightness, a second light receiving element for detecting the light quantity of the backlight is further provided. To detect not only the change in ambient brightness but also the change in the output light amount of the backlight itself,
You always get a good display screen.

[0007]

The method of the prior art is a method of controlling the output light amount of the backlight by adapting to the brightness of the surroundings, and this is often recorded and reproduced.
When used to display the function of a device, the following problems occur.

(1) When performing reserved recording with a video device or the like, it is almost unnecessary to illuminate the liquid crystal display surface brightly, but when the surroundings are bright, the output light amount of the backlight increases and light emission occurs. Waste was generated in terms of the life of the element and the power consumption.

(2) When the surroundings are dark, the output light quantity of the backlight also decreases and the display becomes dark, and when it is necessary to see the display, such as when operating the operation button, the display becomes difficult to see and the operability is improved. Was bad.

As described above, as in the conventional liquid crystal display device, if the output light amount of the backlight is simply controlled according to the brightness of the surroundings, in the AV equipment or the like,
It was hard to say that it was fully functioning.

The present invention has been made in view of the above problems, and the light amount of the backlight is controlled not only by controlling the light amount of the surroundings but also by obtaining necessary information and making a comprehensive judgment. An object is to provide an electronic device with a liquid crystal display device that performs control.

[0012]

According to another aspect of the present invention, there is provided an electronic device with a liquid crystal display device, comprising: an ambient brightness detecting section 21 as ambient brightness detecting means for detecting brightness around the device;
Control information detection units 22 to 28 as device operation state detection means for detecting the operation state of the device, and ambient brightness detection unit 2
1. A microprocessor 14 and a backlight lighting control circuit 13 as control means for controlling the brightness of the backlight of the liquid crystal display device in accordance with the output signal of No. 1 and the detection results of the control information detection units 22 to 28. Is characterized by.

In the electronic device with a liquid crystal display device according to a second aspect, the device operation state detection means is an opening / closing door ON / OF as a means for detecting the opening / closing state of the opening / closing door of the operation panel of the device.
The electronic device with a liquid crystal display device according to claim 1, wherein the electronic device is an F detection unit 23.

According to a third aspect of the present invention, the electronic device with a liquid crystal display device is an AV device, and the device operation state detection means is a timer recording execution detecting section 25 as a means for detecting the operation state of reserved recording of the device. The electronic device with a liquid crystal display device according to claim 1, wherein the electronic device is equipped with a liquid crystal display device.

An electronic device with a liquid crystal display device according to a fourth aspect further comprises a human sensing unit 29 as a human sensing means for confirming the presence of a human in the vicinity of the device. It is an electronic device with the described liquid crystal display device.

[0016]

In the electronic device with the liquid crystal display device having the structure of claim 1, the visible light sensor 21a and the ambient brightness detecting unit 21 detect the brightness around the device and the operation state of the device is controlled by the control information detecting unit. 22 to 28, the microprocessor 14 determines the optimum brightness based on the detection results, and controls the output light amount of the backlight 12.

In this way, unnecessary lighting of the backlight 12 is prevented, the life of the light emitting element is extended, and power consumption is saved. Furthermore, the operability of the device can be improved.

In the electronic device with the liquid crystal display device according to the second aspect, the brightness around the device is detected by the visible light sensor 21a and the ambient brightness detecting section 21, and
ON / OFF of the open / close door of the open / close door 2 of the operation panel
The microprocessor 14 determines the optimum brightness based on the detection results detected by the detection unit 23, and controls the output light amount of the backlight 12. That is, when the opening / closing door 2 with the operation panel is opened, the output light amount of the backlight 12 is increased (brightly lit) to facilitate the operation,
When the opening / closing door 2 of the operation panel is closed, the output light amount of the backlight 12 is decreased (dimmed).

In this way, unnecessary lighting of the backlight is prevented, the life of the light emitting element is extended, and power consumption is saved. Furthermore, the operability of the device can be improved.

In the electronic device with a liquid crystal display device according to the third aspect of the present invention, the visible light sensor 21a and the ambient brightness detecting section 21 detect the brightness around the device, and
The timer recording under-execution detecting unit 25 detects the operation state of reserved recording, and the microprocessor 14 determines the optimum brightness based on the detection results, and controls the output light amount of the backlight 12. That is, during the scheduled recording, the backlight 12 is turned on darkly or turned off.

In this manner, unnecessary lighting of the backlight is prevented, the life of the light emitting element is extended, and power consumption is saved.

The electronic device with a liquid crystal display device having the structure according to claim 4 further comprises a human sensing unit 29 for confirming the presence of a human in the vicinity of the device, so that the backlight is provided when there is no operator of the device. Turn 12 on darkly or turn off.

In this way, unnecessary lighting of the backlight is prevented, the life of the light emitting element is extended, and power consumption is saved.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing an embodiment of an AV device with a liquid crystal display device to which an electronic device with a liquid crystal display device of the present invention is applied. FIG. 1 (a) is an external perspective view of the AV device. 1 (b)
FIG. 3 is a block diagram showing a configuration example of a backlight control circuit of a liquid crystal display device. It should be noted that the present embodiment relates to claims 1 to 4.
It is an embodiment commonly corresponding to the described invention.

In FIG. 1A, a liquid crystal display device 4 and an opening / closing door 2 with an operation panel which can be opened and closed are attached to the front surface (operation surface) of an AV device (video device) body 1.
The opening / closing door 2 with the operation panel is provided with a cutout portion 2a, and the opening / closing door 2 with the operation panel rotates in the direction of the arrow a, so that the main body 1
The liquid crystal display device 4 is configured to be visible from the outside of the device even when it is housed inside. The operation panel on the open / close door 2 with the operation panel has an operation key 3a and an operation button 3b.
Etc. are installed.

In FIG. 1B, a backlight 12 is arranged behind the liquid crystal display panel 11 in the liquid crystal display device 4. The backlight 12 is driven by a backlight lighting control circuit 13 and a microprocessor 14 is provided. The light is turned on with the output light amount according to the light amount command signal (Pr) from the (light amount control means).

FIG. 2 is a block diagram showing the configuration of the light quantity control system in the embodiment of the present invention.

In FIG. 2, the microprocessor 14 obtains the following control information from each of the control information detectors 21 to 29, makes a comprehensive judgment according to the contents programmed in advance, and controls the output light amount of the backlight 12. I do.

(1) It is sent from the ambient brightness detecting section 21 (ambient brightness detecting means) having the visible light sensor 21a,
Ambient brightness information.

(2) Key operation information sent from the operation key input detection unit 22 (device operation state detection means).

(3) Opening / closing information of the open / close door 2 with an operation panel, which is sent from the open / close door switch 23a and the open / close door ON / OFF detector 23 (device operation state detecting means).

(4) Clock information sent from the clock information detecting section 24 (device operation state detecting means).

(5) Information on whether or not timer recording is being executed, which is sent from the timer recording execution detecting section 25 (device operation state detecting means).

(6) Information about whether or not signals are exchanged with the external device, which is sent from the external device communication information detection unit 26 (device operation state detection means).

(7) Power switch 27a and power ON /
ON / OF detection information of the power switch sent from the OFF detection unit 27 (device operation state detection means).

(8) Cassette insertion sensor 28a and cassette IN / OUT detection section 28 (device operation state detection means)
Information about whether or not a video cassette tape is inserted in the device body 1, which is sent from.

(9) Human detection information sent from the human detection unit 29 (human detection means) having the infrared sensor 29a, indicating whether or not there is a human (person operating the device) in the vicinity.

Note that the above control information is one example, and other information may be added depending on the system configuration, or some of the above information may be omitted depending on circumstances.

The microprocessor 14 can obtain the above information and perform the following control, for example.

(1) First, when the surroundings are bright, the backlight 12 is turned on brightly to make the liquid crystal display easier to see. When the surroundings are dark, the backlight 12 is turned on darkly to extend the life of the backlight 12 and reduce power consumption.

(2) Similarly, according to the clock information, the backlight 12 is lit dark at night and bright at daytime.

(3) Since the display is not necessary during the timer reservation, the backlight 12 is turned on darkly or turned off.

(4) Even when the surroundings are dark, when the operation panel is operated or when the opening / closing door 2 with the operation panel is opened, the backlight 12 is illuminated brightly to make the liquid crystal display easy to see and to assist the operation panel. Play the role of lighting.

(5) In addition, when there is a person in the vicinity, when exchanging signals with an external device or when a video cassette tape is inserted, the backlight 12 is used.
Illuminate by to make it easier to see the operating status of the device.

FIG. 3 is a diagram showing a specific example of the light quantity control of the backlight in the embodiment of the present invention, where the maximum allowable output light quantity of the backlight 12 is 100% and the output light quantity when the backlight is off is 0%. , Shows a specific output light amount according to the surrounding situation.

In the example of FIG. 3, first, the time zone is divided into a first time zone from 6:00 am to 12:00 pm and a second time zone from 12:00 pm to 6:00 am Depending on the ambient brightness and the open / closed state of the open / close door 2 with the operation panel,
As shown below, the output light amount of the backlight 12 is controlled.

(1) When the open / close door is closed and the power source is 0N.-When the surroundings are bright 1st time zone 100% 2nd time zone 70% -When the surroundings are dark 1st time zone 50% 2nd time Obi 20%

(2) When the open / close door is closed and timer recording is being performed: -Bright surroundings 1st time zone 50% 2nd time zone 0% -Dark surroundings 1st time zone 0% 2nd Time 0%

(3) When the open / close door is open-When the surrounding area is bright The first time zone is 100% The second time zone is 80% -When the surrounding area is dark The first time zone is 80% The second time zone is 70%

As described above, the following effects can be obtained by using the AV equipment with the liquid crystal display device of the present invention.

(1) To prevent unnecessary lighting of the backlight 12 and extend the life of the light emitting element.

(2) The power consumption of the liquid crystal display device can be effectively saved.

(3) The glare caused by the backlight 12 can be eliminated at the time of reserved recording during sleep.

(4) When the operation button is operated, the backlight 12 is brightly lit to facilitate the operation.

(5) When the opening / closing door 2 with the operation panel is opened, the backlight 12 is brightly turned on to turn on the backlight 1.
2 can be used as auxiliary lighting for the operation surface inside the door.

[0056]

According to the electronic equipment with the liquid crystal display device of the first aspect, the brightness around the equipment is detected, the operation state of the equipment is detected, and the light amount control means is based on the detection results. Since the optimum brightness is determined and the output light amount of the backlight is controlled, wasteful lighting of the backlight is prevented, the life of the light emitting element is extended, and power consumption is saved. Furthermore, the operability of the device can be improved.

According to the electronic equipment with the liquid crystal display device of the second aspect, the brightness around the equipment is detected and
The open / close door with the operation panel is designed to detect the open / closed state of the open / close door with the operation panel, and to determine the optimal brightness based on the detection results to control the output light quantity of the backlight. When is opened, the backlight is brightly lit to facilitate operation, and when the opening / closing door with the operation panel is closed, the backlight is dimmed.
It is possible to prevent wasteful lighting, extend the life of the light emitting element, and save power consumption.

According to the electronic equipment with a liquid crystal display device of the third aspect, the brightness around the equipment is detected, and
The operation status of reserved recording is detected, and the light intensity control unit determines the optimum brightness based on the detection results to control the output light intensity of the backlight, so the backlight is dimmed during reserved recording. The backlight can be turned on or off to prevent unnecessary lighting of the backlight, extend the life of the light emitting element, and save power consumption.

According to the electronic device with the liquid crystal display device of the fourth aspect, the backlight is provided when there is no operator of the device by further comprising human detection means for confirming the presence of a human around the device. Since it is turned on darkly or turned off, useless lighting of the backlight can be prevented, the life of the light emitting element can be extended, and power consumption can be saved.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of an AV device with a liquid crystal display device of the present invention.

FIG. 2 is a block diagram showing a configuration of a light amount control system in the embodiment of the present invention.

FIG. 3 is a diagram showing a specific example of light quantity control of a backlight in an embodiment of the present invention.

FIG. 4 is a diagram showing an example of a conventional liquid crystal display device that controls the light amount of a backlight.

[Explanation of symbols]

1 AV equipment (video equipment) main body 2 Open / close door with operation panel 3a Operation key 3b Operation button 4 Liquid crystal display device 11 Liquid crystal display panel 12 Backlight 13 Backlight lighting control circuit 14 Microprocessor 21 Ambient brightness detection part (ambient brightness 21a visible light sensor 22 operation key input detection unit (device operation state detection unit) 23 open / close door ON / OFF detection unit (device operation state detection unit) 23a door open / close switch 24 clock information detection unit (device operation state) Detecting means) 25 Timer recording in-execution detecting section (device operating state detecting means) 26 External device communication information detecting section (device operating state detecting means) 27 Power ON / OFF detecting section (device operating state detecting means) 27a Power switch 28 cassette IN / OUT detection section (device operation state detection means) 28a Cassette insertion sensor 9 Human sensing unit (human sensing means) 29a infrared sensor

Claims (4)

[Claims] 1. An ambient brightness detecting means for detecting brightness around the equipment, an equipment operating state detecting means for detecting an operating state of the equipment, an output signal of the ambient brightness detecting means and the equipment operating state. An electronic device with a liquid crystal display device, comprising: a light amount control device for controlling an output light amount of a backlight of the liquid crystal display device according to a detection result of the detection device. 2. The electronic device with a liquid crystal display device according to claim 1, wherein the device operation state detection means is a means for detecting an open / closed state of an opening / closing door of an operation panel of the device. 3. The electronic device with a liquid crystal display device is an AV device with a liquid crystal display device, and the device operation state detection means is a means for detecting an operation state of reserved recording of the device. Item 1. An electronic device with a liquid crystal display device according to item 1. 4. A human detection means for confirming the presence of a human around the device is further provided.
Alternatively, the electronic device with a liquid crystal display device according to the item 3.