JP2012129004A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device capable of adjusting brightness of an LED for indicating an operational state or an LED for lighting an operation button, through a simple operation.SOLUTION: A backlight LED 17 irradiates a liquid crystal display 1 with light from behind. Button LEDs 3a-3c irradiate an operation button provided in a display device with light when power of the display device is turned on. A status indicating LED 2 performs light irradiation only when the power of the display device is turned on. A touch pad 13 receives an input of a brightness set point. A light source control unit 99 adjusts brightness of the status indicating LED 2 and the button LEDs 3a-3c in conjunction with the brightness adjustment of the backlight LED 17, based on the brightness set point.

Description

  The present invention relates to a display device, and more particularly to a display device having a display and an LED (Light Emitting Diode) for notifying a user or illuminating a user operation button.

  Conventionally, an apparatus capable of adjusting the brightness of a display by a user operation has been proposed.

  For example, a computer described in Patent Document 1 (Japanese Patent Application Laid-Open No. 2010-117569) is a dual display type computer including a first display and a second display, and the brightness of the first display and the second display. Step value storage means for storing a plurality of operation step values for simultaneously controlling the luminance of the display, and a plurality of first control step values corresponding to the luminance values set in the first display for each operation step value. The operation step value is set so that the luminance value set in the first display and the luminance value set in the second display substantially coincide with each other in the range of the first luminance table to be stored and a predetermined number of consecutive operation step values. A second luminance table storing a plurality of second control step values corresponding to the luminance values set for the second display for each. And a Le. The computer further includes step value selection means for selecting any one of the operation step values from the plurality of operation step values stored in the step value storage means, the selected operation step value and the first luminance. Luminance control means for controlling each backlight with reference to the table and the second luminance table.

  In Patent Document 1, the brightness of the two displays can be adjusted with a single operation by such a configuration.

JP 2010-117569 A

  By the way, when a touch panel is incorporated in a display device and an external device is controlled, an LED for illuminating a user operation button or an operation state (ON or OFF) of the display device is displayed on the display device. LED may be provided.

  When such a display device is used in a dark environment such as a ship at night, in order to avoid glare, the conventional technique described in Patent Document 1 cannot reduce the brightness of the display. However, the brightness of the LEDs for indicating the operating state and the LEDs for illuminating the operation buttons cannot be lowered. Therefore, at present, in order to avoid such glare caused by the LED, the user responds by covering the LED with a seal or the like, which is extremely inconvenient.

  Therefore, an object of the present invention is to provide a display device capable of adjusting the brightness of an LED for indicating an operation state or an LED for illuminating an operation button with a simple operation.

  In order to solve the above-described problems, the present invention is a display device, which is provided in the display device when the display, a backlight light source that irradiates light from behind to the display, and the display device is turned on. An LED that irradiates light to the operation button, an input unit that receives an input of a luminance setting value, and a light source control unit that adjusts the luminance of the backlight light source and the LED based on the luminance setting value.

  The present invention relates to a display device, a backlight source that emits light from behind to the display, an LED that emits light only when the display device is turned on, and a brightness setting value. An input unit that receives an input, and a light source control unit that adjusts the luminance of the backlight light source and the LED based on the set value of the luminance.

  Preferably, the light source control unit stores a table that defines a correspondence between the luminance setting value and the duty ratio, and reads the duty ratio corresponding to the input luminance setting value from the table, and reads the duty A PWM signal generation circuit that outputs a ratio PWM signal, a first driver that controls the luminance of the backlight light source according to the PWM signal, and a second driver that controls the luminance of the LED according to the PWM signal.

  Preferably, the light source control unit includes a first table that defines the correspondence between the luminance setting value and the first duty ratio, and a second table that defines the correspondence between the luminance setting value and the second duty ratio. And a first duty ratio corresponding to the input luminance setting value is read from the first table, and a first PWM signal having the read first duty ratio is output. The second duty ratio corresponding to the input luminance setting value is read from the second table, and the second PWM signal having the read second duty ratio is output. A PWM signal generating circuit; a first driver for controlling the luminance of the backlight light source according to the first PWM signal; and a second driver for controlling the luminance of the LED according to the second PWM signal.

Preferably, the input unit is a touch pad configured integrally with the display.
Preferably, the input unit is a communication circuit that receives a set value of luminance from the outside.

  According to the present invention, it is possible to adjust the brightness of an LED for indicating an operating state or an LED for illuminating an operation button with a simple operation.

It is a figure showing the external appearance of the display apparatus of 1st Embodiment. It is a figure showing the structure of the display apparatus of 1st Embodiment. It is a figure showing the setting screen of a brightness | luminance. It is a figure showing the example of the Duty ratio table of 1st Embodiment. It is a flowchart showing the operation | movement procedure of the display apparatus of 1st Embodiment. It is a figure showing the structure of the display apparatus of 2nd Embodiment. (A) is a figure showing the example of the 1st Duty ratio table of 2nd Embodiment. (B) is a figure showing the example of the 2nd Duty ratio table of 2nd Embodiment. It is a flowchart showing the operation | movement procedure of the display apparatus of 2nd Embodiment. It is a figure showing the structure of the display apparatus of 3rd Embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
[First Embodiment]
(appearance)
FIG. 1 is a diagram illustrating an appearance of a display device according to the first embodiment.

  The display device includes a liquid crystal touch panel in which the liquid crystal display 1 and the touch pad 13 are integrated. In addition, this display device includes a status display LED 2 provided inside a housing outside the liquid crystal panel, and button LEDs 3a to 3c.

  When the user inputs from the touch pad 13, the device can be controlled via the programmable controller connected to the display device. Moreover, the temperature information of an apparatus etc. can be displayed on the liquid crystal display 1 via a programmable controller.

  The button LEDs 3a to 3c are LEDs that irradiate light from behind to operation buttons provided on the display device when the display device is powered on.

The status display LED 2 is an LED that emits light only when the power of the display device is on.
(Constitution)
FIG. 2 is a diagram illustrating the configuration of the display device according to the first embodiment.

  Referring to FIG. 2, the display device 51 includes a memory 11, an MPU (Micro-Processing Unit) 12, a light source control unit 99, a backlight LED 17, a liquid crystal display (LCD: Liquid Crystal Display) 1, A touch pad 13, a status display LED 2, and button LEDs 3a, 3b, 3c are provided.

  The liquid crystal display 1 displays a GUI (Graphical User Interface) image for controlling the device.

The touch pad 13 receives an input from the user for controlling the device.
A brightness setting screen as shown in FIG. 3 is displayed on the liquid crystal display 1. When the user touches the up button 4, the luminance setting value 6 increases. When the user touches the down button 5, the luminance setting value 6 decreases. For example, in the case where the luminance setting value is 32 levels from 0 to 31, any luminance setting value from 0 to 31 is input.

The backlight LED 17 irradiates the liquid crystal display 1 with light from behind.
The memory 11 stores the brightness setting value input from the touch pad 13. For example, in the case where the luminance setting value has 32 levels of 0 to 31, the memory 11 stores the luminance setting value of any of 0 to 31.

  The MPU 12 outputs a control signal representing the luminance setting value stored in the memory 11 to the light source control unit 99. For example, in the case where the luminance setting values are 32 levels from 0 to 31, the MPU 12 outputs a control signal representing any luminance setting value from 0 to 31 stored in the memory 11.

  The light source control unit 99 adjusts the brightness of the backlight LED 17, the buttons LEDs 3a, 3b, and 3c, and the status display LED based on the brightness setting value.

  The light source control unit 99 includes a duty ratio table storage unit 14, a PWM (Pulse Width Modulation) signal generation circuit, a backlight LED driver 16, a status display LED driver 19, and button LED drivers 21a, 21b, and 21c. .

  The duty ratio table storage unit 14 stores a duty ratio table. The duty ratio table defines the correspondence between the luminance setting value and the duty ratio. For example, when the luminance setting value is 32 levels from 0 to 31, the duty ratio table defines the correspondence of the duty ratio corresponding to each level from 0 to 31.

FIG. 4 is a diagram illustrating an example of the duty ratio table according to the first embodiment.
As shown in FIG. 4, this duty ratio table is set so that the duty ratio becomes high when the set value of luminance is large. However, where the luminance setting value is small (shown in A of FIG. 4) and where the luminance setting value is large (shown in C of FIG. 4), the luminance setting value is intermediate (shown in B of FIG. 4). The amount of change in the duty ratio is small with respect to the change in the set value of the brightness so that the adjustment can be made more finely than shown.

  The PWM signal generation circuit 15 receives the control signal output from the MPU 12, reads the duty ratio corresponding to the luminance setting value from the duty ratio table, and outputs the read PWM signal of the duty ratio.

  The backlight LED driver 16 controls the luminance of the backlight LED 17 by changing the current or voltage to the backlight LED 17 based on the PWM signal.

  The status display LED driver 19 controls the luminance of the status display LED by changing the current or voltage to the status display LED based on the PWM signal.

  The button LED drivers 21a, 21b, and 21c control the luminance of the buttons LED 3a, 3b, and 3c by changing the current or voltage to the buttons LED 3a, 3b, and 3c based on the PWM signal.

(Operation)
FIG. 5 is a flowchart showing an operation procedure of the display device according to the first embodiment.

  Referring to FIG. 5, first, when the user inputs a luminance setting value from touchpad 13, MPU 12 stores the input luminance setting value in memory 11 (step S101).

  Next, the MPU 12 outputs a control signal representing the luminance setting value to the PWM signal generation circuit 15 (step S102).

  Next, the PWM signal generation circuit 15 reads the duty ratio corresponding to the luminance setting value from the duty ratio table, and outputs a PWM signal based on the read duty ratio (step S103).

  The backlight LED driver 16 controls the luminance of the backlight LED 17 in accordance with the PWM signal. At the same time, the status display LED driver 19 and the button LED drivers 21a, 21b, and 21c also control the brightness of the status display LED2 and the button LEDs 3a, 3b, and 3c according to the PWM signal (step S104).

(effect)
As described above, according to the display device of the first embodiment, the button is operated in conjunction with the adjustment of the luminance of the light source of the backlight of the display based on a simple operation of inputting the luminance setting value from the user. The brightness of the LED and the status display LED can be adjusted.

[Second Embodiment]
(Constitution)
FIG. 6 is a diagram illustrating the configuration of the display device according to the second embodiment.

  The difference between the display device 52 of the second embodiment and the display device 51 of the first embodiment is as follows.

  The display device 52 of the second embodiment includes a first duty ratio table storage unit 42, a first PWM signal generation circuit 43, a second duty ratio table storage unit 44, and a second PWM signal generation circuit 45.

  The first duty ratio table storage unit 42 stores a first duty ratio table. The first duty ratio table defines the correspondence between the luminance setting value and the first duty ratio.

  The second duty ratio table storage unit 44 stores a second duty ratio table. The second duty ratio table defines the correspondence between the luminance setting value and the second duty ratio.

  FIG. 7A is a diagram illustrating an example of a first duty ratio table according to the second embodiment. FIG. 7B is a diagram illustrating an example of a second duty ratio table according to the second embodiment.

  In this example, in the second duty ratio table, the duty ratio when the luminance setting value is small (dark) is larger than in the first duty ratio table. This is because the buttons LED 3a, 3b, 3c and the status display LED 2 and the backlight LED 17 are driven by the PWM signal having the same duty ratio, and the buttons and the status display are illuminated by the button LEDs 3a, 3b, 3c and the status display LED 2. Is considered to be different from the apparent brightness of the liquid crystal display 1 illuminated by the backlight LED 17.

  The first PWM signal generation circuit 43 receives the control signal output from the MPU 12, reads the duty ratio corresponding to the luminance setting value from the first duty ratio table, and outputs the first PWM signal of the read duty ratio. Output.

  The second PWM signal generation circuit 45 receives the control signal output from the MPU 12, reads the duty ratio corresponding to the luminance setting value from the second duty ratio table, and outputs the second PWM signal having the read duty ratio. Output.

(Operation)
FIG. 8 is a flowchart showing an operation procedure of the display device 52 according to the second embodiment.

  Referring to FIG. 8, first, when the user inputs a luminance setting value from touch pad 13, MPU 12 stores the input luminance setting value in memory 11 (step S101).

  Next, the MPU 12 outputs a control signal representing the set value of luminance to the first PWM signal generation circuit 43 and the second PWM signal generation circuit 45 (step S202).

  Next, the first PWM signal generation circuit 43 reads the duty ratio corresponding to the luminance setting value from the first duty ratio table, and outputs the first PWM signal having the read duty ratio (step S203).

  Further, the second PWM signal generation circuit 45 reads the duty ratio corresponding to the luminance setting value from the second duty ratio table and outputs the second PWM signal having the read duty ratio (step S204).

  The backlight LED driver 16 controls the luminance of the backlight LED 17 according to the first PWM signal. At the same time, the status display LED driver 19 and the button LED drivers 21a, 21b, and 21c control the brightness of the status display LED2 and the buttons LED 3a, 3b, and 3c according to the second PWM signal (step S205).

(effect)
As described above, according to the display device of the second embodiment, similarly to the first embodiment, the light source of the backlight of the display is based on a simple operation of inputting a set value of luminance from the user. Simultaneously with the brightness adjustment, the brightness of the button LED and the status display LED can also be adjusted. Further, according to the display device of the second embodiment, the duty ratio table for adjusting the brightness of the backlight LED and the table for adjusting the brightness of the status display LED and the button LED are separately provided. By appropriately adjusting the value of the duty ratio with respect to the setting value of the brightness, the brightness of the button and the status display illuminated by the button LED and the status display LED, and the brightness of the liquid crystal display illuminated by the backlight LED are adjusted. It can be the same level.

[Third Embodiment]
FIG. 9 is a diagram illustrating a configuration of a display device according to the third embodiment.

  The third embodiment is used when the luminance is changed according to the output value of an illuminance sensor or the like. In the third embodiment, the output value of the illuminance sensor is taken into the programmable controller. The display device 53 of the third embodiment includes a communication circuit 49 for receiving a set value of luminance corresponding to the output of the illuminance sensor from the programmable controller instead of the touch pad. The brightness setting value received by the communication circuit 49 is sent to the MPU. Other configurations and operations are the same as those in the first embodiment.

(effect)
As described above, according to the display device of the third embodiment, the button LED and the status display LED are simultaneously adjusted with the adjustment of the luminance of the light source of the backlight of the display based on the reception of the luminance setting value from the outside. You can also adjust the brightness.

(Modification)
The present invention is not limited to the above embodiment, and includes, for example, the following modifications.

(1) Backlight light source In the embodiment of the present invention, the backlight light source is an LED, but is not limited to this, and may be, for example, a CCFL (Cold Cathode Fluorescent Lamp).

(2) Adjustment of luminance according to time The luminance of the state LED and the button LED may be changed together with the backlight LED according to the time.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1 LCD, 2 status display LED, 3a-3c button LED, 11 memory, 12 MPU, 14 Duty ratio table memory | storage part, 15 PWM signal generation circuit, 16 backlight LED driver, 17 backlight LED, 19 status display LED driver, 21a-21c Button LED driver, 42 1st duty ratio table storage unit, 43 1st PWM signal generation circuit, 44 2nd duty ratio table storage unit, 45 2nd PWM signal generation circuit, 51, 52, 53 Display device, 98, 99 Light source control Department.

Claims (6)

A display device,
Display,
A backlight light source for irradiating light from the back of the display;
An LED that emits light to an operation button provided on the display device when the display device is turned on;
An input unit that receives an input of a set value of brightness;
A display device comprising: a backlight source and a light source control unit that adjusts the brightness of the LED based on the brightness setting value. A display device,
Display,
A backlight light source for irradiating light from the back of the display;
An LED that emits light only when the display device is powered on;
An input unit that receives an input of a set value of brightness;
A display device comprising: a backlight source and a light source control unit that adjusts the brightness of the LED based on the brightness setting value. The light source controller is
A storage unit that stores a table that defines the correspondence between the luminance setting value and the duty ratio;
With reference to the table, a PWM signal generation circuit that outputs a PWM signal having a duty ratio corresponding to the input luminance setting value;
A first driver for controlling the brightness of the backlight according to the PWM signal;
The display device according to claim 1, further comprising: a second driver that controls luminance of the LED according to the PWM signal. The light source controller is
A storage unit that stores a first table that defines the correspondence between the set value of brightness and the first duty ratio, and a second table that defines the correspondence between the set value of brightness and the second duty ratio;
A first PWM signal generating circuit for referring to the first table and outputting a first PWM signal having a first duty ratio corresponding to the set luminance value;
A second PWM signal generation circuit that outputs a second PWM signal having a second duty ratio corresponding to the input luminance setting value with reference to the second table;
A first driver for controlling the brightness of the backlight according to the first PWM signal;
The display device according to claim 1, further comprising: a second driver that controls the luminance of the LED according to the second PWM signal.   The display device according to claim 1, wherein the input unit is a touch pad configured integrally with the display.   The display device according to claim 1, wherein the input unit is a communication circuit that receives a luminance setting value from the outside.

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