JP2009294293A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device that enables a user to check changes in an electricity bill when luminance of a light source is changed. <P>SOLUTION: A liquid crystal television set (display device) 100 includes a liquid crystal panel 18, a backlight 14 irradiating the liquid crystal panel 18 with light, and a microcomputer 20 for controlling luminance of the backlight 14. The microcomputer 20 computes the rough estimate of an annual electricity bill in accordance with the luminance of the backlight 14 and displays the rough estimate of the computed electricity bill on the liquid crystal panel 18. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a display device including a display panel and a light source.

  Conventionally, a liquid crystal television receiver (display device) including a liquid crystal panel (display panel) and a backlight (light source) is known. In this liquid crystal television receiver, much of the power consumption is occupied by the power consumption in the backlight. Therefore, the power consumption of the liquid crystal television receiver is greatly changed by changing the luminance of the backlight. That is, the electricity charge of the liquid crystal television receiver is greatly changed by changing the luminance of the backlight.

  Conventionally, various types of electrical devices that display power consumption and electricity charges are known (see, for example, Patent Documents 1 to 4).

  Patent Document 1 discloses a power display device for displaying the power consumption of a television receiver. Further, Patent Document 2 discloses a power consumption display system that calculates power consumption by each electrical device in a house and displays it on a television receiver. Moreover, the said patent document 3 is disclosing the sanitary washing apparatus by which the electricity bill corresponding to power consumption is displayed. Further, Patent Literature 4 discloses a television broadcast receiving apparatus that displays an electricity bill at the broadcast time of each program together with program information.

Japanese Utility Model Publication No. 57-261161 Japanese Patent Laid-Open No. 2002-40055 JP 2000-240129 A JP 2006-203720 A

  However, in the conventional liquid crystal television receiver, when the brightness of the backlight is changed, the electricity charge of the liquid crystal television receiver changes greatly, but the user cannot confirm the change in the electricity charge. There is a problem.

  In addition, in the electric appliances disclosed in Patent Documents 1 to 4 described above, the configuration for allowing the user to check the change in the electricity bill of the liquid crystal television receiver when the brightness of the backlight is changed is disclosed. It has not been.

  The present invention solves the above-described problems, and an object of the present invention is to provide a display device that allows a user to confirm a change in electricity bill when the luminance of a light source is changed. That is.

  The display device of the present invention is a display device including a display panel, a light source that irradiates light to the display panel, and a control unit for adjusting the luminance of the light source. The standard is calculated according to the luminance of the light source, and the calculated standard for the electricity bill is displayed on the display panel.

  With this configuration, when the brightness of the light source is changed, a guideline for electricity charges within a predetermined period is calculated according to the changed brightness, and the guideline for electricity charges is displayed on the display panel. The user can confirm the change in the electricity bill by changing the luminance of the light source.

  Preferably, the display device further includes a detection unit for measuring the power supplied to the light source, and the control unit is configured to adjust the luminance of the light source by adjusting the power supplied to the light source. And based on the detection result of a detection part, it is comprised so that the standard of the electricity bill in a predetermined period may be calculated by calculating the standard of the power consumption in a predetermined period.

  By configuring in this way, it is possible to easily calculate a guideline for electricity charges within a predetermined period.

  In this case, it is preferable that the unit price of the electricity charge can be set by the user, and the control unit can set the unit price of the electricity charge within the predetermined period based on the guideline of the power consumption amount within the predetermined period and the unit price of the electricity charge. It is configured to calculate the electricity bill.

  By configuring in this way, even when the unit price of the electricity bill is changed, the user can accurately calculate the standard of the electricity bill within a predetermined period by resetting.

  In the above display device, preferably, the control unit is configured to display the calculated guide of the electricity bill on the display panel together with the luminance information of the light source when the luminance of the light source is changed.

  By configuring in this way, the user can confirm the standard of the electricity bill within a predetermined period together with the luminance information of the light source when the luminance of the light source is changed.

  ADVANTAGE OF THE INVENTION According to this invention, when the brightness | luminance of a light source is changed, the display apparatus with which a user can confirm the change of an electricity bill can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, a case where the present invention is applied to a liquid crystal television receiver (hereinafter simply referred to as “liquid crystal television”) which is an example of a display device will be described.

  FIG. 1 is a perspective view showing an overall configuration of a liquid crystal television according to an embodiment of the present invention. FIG. 2 is a block diagram showing the overall configuration of the liquid crystal television of FIG. 3 and 4 are diagrams showing a liquid crystal panel of the liquid crystal television shown in FIG. First, the configuration of the liquid crystal television 100 according to the present embodiment will be described with reference to FIGS.

  As shown in FIG. 1, a liquid crystal television 100 according to an embodiment of the present invention includes a television main body 1 that receives and displays a television broadcast and a remote controller 2 that remotely operates the television main body 1.

  As shown in FIG. 2, the television body 1 includes a bridge rectifier circuit 11, a detection unit 12, an inverter circuit 13, a backlight 14, a tuner 15, a video processing circuit 16, a drive circuit 17, and a liquid crystal panel. 18, a receiving unit 19, and a microcomputer (hereinafter referred to as “microcomputer”) 20. The backlight 14 is an example of the “light source” in the present invention, and the liquid crystal panel 18 is an example of the “display panel” in the present invention. The microcomputer 20 is an example of the “control unit” in the present invention.

  The bridge rectifier circuit 11 includes four diodes and the like, and is configured to convert electric power supplied from the AC power source 150 from AC to DC and output the same to the inverter circuit 13. Although not shown in FIG. 2, the bridge rectifier circuit 11 supplies power to the microcomputer 20 and the like. In the television main body 1, much of the power consumption is occupied by the power supplied to the inverter circuit 13. That is, in the television main body 1, since the power consumption changes greatly when the luminance of the backlight 14 is changed, the electricity rate changes greatly.

  The detector 12 is provided for measuring the power supplied to the inverter circuit 13. The detection unit 12 includes a resistor 12a, a voltage detection circuit 12b, and an A / D conversion circuit 12c. The resistor 12 a is connected in series between the bridge rectifier circuit 11 and the inverter circuit 13. The voltage detection circuit 12b is configured to detect the voltage at the node N1 between the bridge rectifier circuit 11 and the resistor 12a and the voltage at the node N2 between the resistor 12a and the inverter circuit 13. The A / D conversion circuit 12c has a function of converting the detection result of the voltage detection circuit 12b from an analog signal to a digital signal and outputting the result to the microcomputer 20.

  The inverter circuit 13 is provided to convert the DC voltage supplied from the bridge rectifier circuit 11 into a high-voltage AC voltage and supply it to the backlight 14. The backlight 14 is provided for irradiating light from the back surface of the liquid crystal panel 18. The backlight 14 includes a cold cathode tube and the like, and is configured such that the cold cathode tube is turned on by a voltage supplied from the inverter circuit 13.

  The tuner 15 has a function of selecting a television broadcast channel received by the antenna 151 and outputting video data of the selected channel to the video processing circuit 16. The video processing circuit 16 is configured to perform predetermined processing on the video data input from the tuner 15 and output the video data on which the predetermined processing has been performed to the drive circuit 17. The video processing circuit 16 has a function of superimposing OSD data on video data when OSD (On-Screen Display) data is supplied from the microcomputer 20. The drive circuit 17 has a function of generating a drive signal for controlling the aperture ratio of each dot of the liquid crystal panel 18 based on the video data input from the video processing circuit 16. The liquid crystal panel 18 is configured to display an image by transmitting light emitted from the backlight 14 in accordance with a drive signal.

  The receiving unit 19 has a function of receiving a remote control signal output from the remote controller 2 and outputting it to the microcomputer 20. The microcomputer 20 has a function of controlling the operation of the television main body 1. Further, the microcomputer 20 is configured to set the luminance of the backlight 14 to “bright”, “standard”, or “dark” by controlling the inverter circuit 13.

  In addition, the microcomputer 20 has a function of calculating a standard Pt of annual power consumption in the backlight 14. Specifically, the microcomputer 20 stores an average viewing time per day and a resistance value of the resistor 12a. The microcomputer 20 receives the voltage at the node N1 and the voltage at the node N2 from the detection unit 12. Therefore, the microcomputer 20 can calculate the current of the resistor 12a from the difference between the voltage at the node N1 and the voltage at the node N2 and the resistance value of the resistor 12a. As a result, the microcomputer 20 can calculate the electric power P supplied to the inverter circuit 13 from the current of the resistor 12a and the voltage of the node N1. Then, the microcomputer 20 calculates a standard Pt of the annual power consumption from the power P supplied to the inverter circuit 13 and the average viewing time per day.

For example, if the resistance value of the resistor 12a is 0.5 (Ω), the voltage at the node N1 is 30 (V), and the voltage at the node N2 is 28.5 (V),
P = {(30-28.5) /0.5} × 30 = 90 (W)
It becomes. And if the average viewing time per day is 4.5 (hours),
Pt = 90 × 4.5 × 365 / 1000≈148 (kWh / year)
It becomes.

  Here, in the present embodiment, the television main body 1 has a function of calculating the standard A of the annual electricity bill. Specifically, the television main body 1 is configured such that the user can set an electricity bill per kWh using the remote controller 2. Therefore, the television main unit 1 can calculate the standard A of the annual electricity charge from the standard Pt of the annual power consumption and the electricity charge per kWh. The annual electricity charge is an example of the “electricity charge within a predetermined period” of the present invention.

For example, if the electricity rate per kWh is set to 30 (yen), when Pt is 148 (kWh / year),
A = 148 × 30 = 4440 (yen / year)
It becomes.

  Further, the television main body 1 has a function of displaying an “electricity unit price setting” screen W 1 as shown in FIG. 3 on the liquid crystal panel 18. The television main unit 1 is configured such that the user can set the electricity charge per kWh to a predetermined value when the “electricity unit price setting” screen W1 is displayed.

  In the present embodiment, the television main body 1 is configured such that the user can set whether or not to display the annual electricity bill standard A together with the luminance information of the backlight 14 by using the remote controller 2. Specifically, the television main body 1 has a function of displaying an “electricity charge display setting” screen W2 as shown in FIG. The TV main unit 1 is configured so that the user can set whether or not to display the guideline A of the annual electricity charge when the “electricity charge display setting” screen W2 is displayed. Yes.

  FIG. 5 is a flowchart for explaining the operation of changing the luminance of the backlight of the liquid crystal television according to the embodiment of the present invention. 6 to 8 are views showing a liquid crystal panel of the liquid crystal television shown in FIG. Next, with reference to FIG. 2 and FIGS. 5 to 8, an operation when the luminance of the backlight 14 of the liquid crystal television 100 according to the present embodiment is changed will be described.

  First, in the liquid crystal television 100 (see FIG. 2), in step S1 of FIG. 5, the microcomputer 20 (see FIG. 2) causes the receiving unit 19 (see FIG. 2) to change from the remote controller 2 (see FIG. 2) to the backlight 14 (see FIG. 2). 2), it is determined whether or not a remote control signal indicating that the luminance is to be changed has been received. If the microcomputer 20 determines that the receiver 19 has received the remote control signal, the process proceeds to step S2. On the other hand, if the microcomputer 20 determines that the receiver 19 has not received the remote control signal, step S1 is repeated.

  Next, in step S2, the microcomputer 20 controls the inverter circuit 13 (see FIG. 2), whereby the luminance of the backlight 14 is changed to “bright”, “standard”, or “dark”. The

  Next, in step S3, the microcomputer 20 determines whether or not an electricity rate per kWh is set. If the microcomputer 20 determines that the electricity price per kWh is set (see FIG. 3), the process proceeds to step S4. On the other hand, if the microcomputer 20 determines that the electricity rate per kWh is not set, the process proceeds to step S8.

  Next, in step S4, the microcomputer 20 determines whether or not to display the annual electricity rate guide A. If the microcomputer 20 determines that the display setting of the standard A for the annual electricity bill is made (see FIG. 4), the process proceeds to step S5. On the other hand, if it is determined by the microcomputer 20 that the display setting of the annual electricity bill standard A is not set, the process proceeds to step S8.

  Next, in step S5, the microcomputer 20 calculates a standard Pt of annual power consumption. In step S6, the microcomputer 20 calculates a standard A for the annual electricity bill.

  Next, in step S7, the microcomputer 20 displays the standard A for the annual electricity bill on the liquid crystal panel 18 (see FIG. 2) for a predetermined period (for example, about 5 seconds) together with the luminance information of the backlight 14, and thereafter The brightness changing operation is finished. For example, when the brightness of the backlight 14 is changed to “standard” in step S2, as shown in FIG. 6 by the microcomputer 20, the standard A (4440 yen) of the annual electricity rate calculated in step S6. Is displayed together with luminance information (standard) of the backlight 14. When the brightness of the backlight 14 is changed to “bright” in step S2, as shown in FIG. 7 by the microcomputer 20, the standard A (7391 yen) of the annual electricity bill calculated in step S6. Is displayed together with the luminance information (bright) of the backlight 14. If the luminance of the backlight 14 is changed to “dark” in step S2, the microcomputer 20 uses the microcomputer 20 as shown in FIG. 8 to calculate the annual electricity bill A calculated in step S6 (2874 yen). Is displayed together with the luminance information (dark) of the backlight 14.

  In step S8, only the luminance information of the backlight 14 is displayed on the liquid crystal panel 18 for a predetermined period (for example, about 5 seconds) by the microcomputer 20, and then the luminance changing operation ends.

  In the present embodiment, as described above, by displaying on the liquid crystal panel 18 the standard A of the annual electricity charge according to the brightness of the backlight 14, the user can change the brightness of the backlight 14 by changing the brightness of the backlight 14. Changes can be confirmed. Therefore, when the user lowers the brightness of the backlight 14, it is possible to confirm the annual electricity bill A that greatly decreases. Therefore, the user should use the backlight 14 with the brightness reduced. Can be encouraged. Thereby, promotion of energy saving can be aimed at.

  In the present embodiment, by providing the detection unit 12, it is possible to calculate power consumption corresponding to the luminance of the backlight 14. Therefore, it is possible to easily calculate the annual electricity bill A.

  Further, in the present embodiment, by configuring the electricity rate per 1 kWh so that the unit price of the electricity rate is changed, the user can set the electricity rate for the annual electricity rate accurately even if the unit price is changed. Can be calculated.

  The present invention can adopt various embodiments other than those described above. For example, in the above embodiment, the user may set an average viewing time per day. Alternatively, the microcomputer 20 may calculate the average viewing time per day based on the usage history. If comprised in this way, the standard A of the annual electricity bill according to a user's utilization condition is computable.

  Moreover, in the said embodiment, although the backlight 14 which can change a brightness | luminance in three steps was shown, you may use the backlight 14 which can change a brightness | luminance linearly not only in this.

  Moreover, although the example which calculates the standard Pt of the annual power consumption in the backlight 14 was shown in the said embodiment, it does not restrict to this but calculates the standard of the annual power consumption in the television main body 1. Also good.

  Moreover, in the said embodiment, when the brightness | luminance of the backlight 14 was changed, the example which displays the standard A of the annual electricity bill according to the brightness | luminance after a change was shown, but it is not restricted to this, The backlight 14 When the brightness is changed, an annual electricity bill guide according to the brightness before the change and an annual electricity bill guide according to the brightness after the change may be displayed. In addition, when the brightness of the backlight 14 is changed, the difference between the estimated annual electricity charge according to the brightness before the change and the estimated annual electricity charge according to the brightness after the change is displayed. May be.

  Moreover, in the said embodiment, when the brightness | luminance of the backlight 14 was changed, the example which displays the standard A of an annual electricity bill was shown, but it is not restricted to this, Without changing the brightness | luminance of the backlight 14 A guideline A for the annual electricity bill according to the current luminance may be displayed. In addition, a list of annual electricity bill guidelines A corresponding to each luminance (“bright”, “standard”, and “dark”) may be displayed.

  Moreover, in the said embodiment, when the brightness | luminance of the backlight 14 was changed, the example which displays the standard A of an annual electricity bill with the brightness | luminance information of the backlight 14 was shown, but it is not restricted to this, The backlight 14 When the brightness of is changed, only the guideline A of the annual electricity bill may be displayed.

  Moreover, although the example which displays the standard A of an annual electricity bill was shown in the said embodiment, it is not restricted to this, For example, you may make it display the standard of the monthly electricity bill.

  Further, the liquid crystal television may be configured so that the user can set the upper limit of the annual electricity charge, and the backlight may be controlled so that the luminance is in accordance with the set upper limit of the annual electricity charge.

It is the perspective view which showed the whole structure of the liquid crystal television by one Embodiment of this invention. It is the block diagram which showed the whole structure of the liquid crystal television of FIG. It is the figure which showed the liquid crystal panel of the liquid crystal television of FIG. It is the figure which showed the liquid crystal panel of the liquid crystal television of FIG. 5 is a flowchart for explaining a luminance changing operation of a backlight of a liquid crystal television according to an embodiment of the present invention. It is the figure which showed the liquid crystal panel of the liquid crystal television of FIG. It is the figure which showed the liquid crystal panel of the liquid crystal television of FIG. It is the figure which showed the liquid crystal panel of the liquid crystal television of FIG.

Explanation of symbols

12 detector 14 backlight (light source)
18 Liquid crystal panel (display panel)
20 Microcomputer (control unit)
100 LCD TV (display device)

Claims (4)

A display panel;
A light source for irradiating the display panel with light;
In a display device comprising a control unit for adjusting the luminance of the light source,
The control unit is configured to calculate a guideline of the electricity bill within a predetermined period according to the luminance of the light source, and to display the calculated guideline of the electricity bill on the display panel. Display device. The display device according to claim 1,
A detector for measuring the power supplied to the light source;
The control unit is configured to adjust the luminance of the light source by adjusting the power supplied to the light source, and based on the detection result of the detection unit, the power consumption amount within the predetermined period The display device is configured to calculate a guideline for electricity charges within the predetermined period by calculating a guideline. The display device according to claim 2,
It is configured so that the user can set the unit price of electricity charges,
The control unit is configured to calculate a guideline for an electricity bill within the predetermined period based on a guideline for power consumption within the predetermined period and a unit price of the electricity bill. Display device. The display device according to any one of claims 1 to 3,
The control unit is configured to display, on the display panel, the calculated guide of the electricity bill together with the luminance information of the light source when the luminance of the light source is changed. .

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