JP2005077206A - Display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a user friendly display capable of reducing power consumption regarding the display provided with a plurality of light sources for illuminating display elements. <P>SOLUTION: The display comprises the display elements 1, a back light device 2 provided with a plurality of light sources 21-24 for illuminating the display elements 1, the display switching switch 3 for selecting either a full surface display using the full surface of the display elements 1 or a partial display state using a part of the display elements 1, the integrated lighted time storage part 5 for storing the data of the integrated lighted time of the lighted light source when the display elements are in partially display state, and the control part 4 for controlling when the switch 3 selects the partial display state that lighting the light source from among the plurality of light sources 21-24 stored in the integrated lighted time storage part 5 and switching the lighted light source for every specific time, and also displaying on the display elements 1 corresponding to the lighted light source. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a display device including a plurality of light sources that illuminate a display element.

A conventional display device uses a liquid crystal display element as a display element, and includes a backlight device that illuminates the liquid crystal display element. This backlight device illuminates the liquid crystal display element from behind, and this backlight device includes a plurality of light emitting diodes as light sources (for example, Patent Document 1).
JP 2002-72901 A (FIGS. 1, 5 and 8)

  The display device is used for a vehicle navigation device, a mileage accumulator of a vehicle instrument device, a warning display device, and the like. In particular, in the case of a navigation device, unlike a mileage accumulator or the like, the display can be stopped even when the vehicle is operating (or during operation of the internal combustion engine of the vehicle) by the user's selection. In particular, the display may be stopped in order to reduce power consumption and prevent the vehicle battery from running out, or in consideration of the life of the display device (display element or light source).

  However, in recent years, the mounting rate of navigation devices for vehicles has increased, and in such a situation, the display device is not a display device dedicated to the navigation device, but any information on the vehicle, such as time and audio devices. Since information, radio information, and the like are displayed, there is a problem that if the display of the display device is stopped, the vehicle information cannot be displayed at all, which makes it difficult to use.

  Therefore, an object of the present invention is to provide a display device that can reduce power consumption and is easy to use.

  The present invention provides a display element that can be displayed using only a part of the screen, a plurality of light sources that illuminate the display element, and turns on an arbitrary light source among the plurality of light sources, And a control unit that performs display in the display area of the display element corresponding to the light source that is turned on.

  Select a display element, a plurality of light sources for illuminating the display element, and a full screen display state using the full screen of the display element or a partial display state using only a part of the screen of the display element. A display state selection unit to be selected, a light source that is lit when the display element is in a partial display state, a lighting time integration storage unit that stores data obtained by integrating the lighting time, and a partial display state selected by the display state selection unit The light source stored in the lighting time integration storage unit is turned on from among the plurality of light sources, and the light source that is turned on every predetermined time is switched and controlled, and the display area of the display element corresponding to the light source that has been turned on And a control unit that performs display.

  Select a display element, a plurality of light sources for illuminating the display element, and a full screen display state using the full screen of the display element or a partial display state using only a part of the screen of the display element. A display state selection unit, a lighting time integration storage unit that stores data obtained by integrating the lighting times of the plurality of light sources, and each of the plurality of light sources when a partial display state is selected by the display state selection unit. The light source that is preferentially turned on from the light source with a short integration time is determined from the integration time of each light source in the lighting time integration storage unit so that the lighting time is equivalent, and the light source corresponding to the determined light source And a control unit that performs display in the display area of the display element.

  The display device of the present invention can achieve the initial purpose, can reduce power consumption, and can provide a user-friendly display device.

  The present invention provides a display element 1 that can display using only a part of the screen, a plurality of light sources 21 to 24 that illuminate the display element 1, and an arbitrary one of the plurality of light sources 21 to 24 A control unit 4 that turns on the light source and performs display in the display area of the display element 1 corresponding to the light source that has been turned on is provided. With this configuration, it is possible to provide a display device that can reduce power consumption and is easy to use.

  In addition, the display device 1, the backlight device 2 including a plurality of light sources 21 to 24 that illuminate the display device 1, and the full screen display state using the full screen of the display device 1 or the screen of the display device 1 A display changeover switch 3 that is a display state selection unit that selects whether a partial display state using only a part is selected, and a light source that is lit when the display element 1 is in a partial display state and a lighting that stores data obtained by integrating the lighting time When a partial display state is selected by the time integration storage unit 5 and the display changeover switch 3, the light source stored in the lighting time integration storage unit 5 is turned on from the plurality of light sources 21 to 24 and is turned on at predetermined intervals. And a control unit 4 that performs switching control of the light source and performs display in the display area of the display element 1 corresponding to the light source that has been turned on. With this configuration, it is possible to provide a display device that can reduce power consumption and is easy to use.

  In addition, the display device 1, the backlight device 2 including a plurality of light sources 21 to 24 that illuminate the display device 1, and the full screen display state using the full screen of the display device 1 or the screen of the display device 1 A display changeover switch 3 that is a display state selection unit that selects whether a partial display state using only the unit, a lighting time integration storage unit 5 that stores data obtained by integrating the lighting times of the plurality of light sources 21 to 24, and From the accumulated time of each light source 21 to 24 in the lighting time integration storage unit 5 so that the lighting times of the plurality of light sources 21 to 24 become equal when the partial display state is selected by the display changeover switch 3. A control unit 4 that determines a light source to be preferentially turned on from a light source with a short time and performs display in a display area of the display element 1 corresponding to the determined light source. With this configuration, it is possible to provide a display device that can reduce power consumption and is easy to use.

  Hereinafter, a case where the first embodiment of the display device of the present invention is employed in a vehicle navigation device will be described as an example with reference to the accompanying drawings.

  The display device 100 according to the present embodiment includes a display element 1, a backlight device 2 including light sources 21 to 24 that illuminate the display element 1, and a display switching that is a display state selection unit that switches the display state of the display element 1. A switch 4, a control unit 4 that controls the display element 1 and the backlight device 2, and a lighting time integration storage unit 5 that integrates the lighting times of the light sources 21 to 24 of the backlight device 2 are provided.

  The display element 1 is a transmissive display element, and in this embodiment, a matrix type liquid crystal display element is adopted so as to be compatible with all vehicle information and navigation map display. It is possible to perform display by using a part of the screen.

  The backlight device 2 is provided behind the display element 1 and includes a plurality of light sources 21 to 24. In this embodiment, the number of the light sources 21 to 24 is four. In this embodiment, the light sources 21 to 24 employ light emitting diodes as small and durable light sources.

  The display changeover switch 3 is used by the driver of the vehicle to change the display state of the display element 1. There are two display states of the display element 1, that is, a full screen display state that uses the entire display element, or a partial display state that uses only a part of the screen of the display element. The full screen display state is used when displaying information such as a map of the navigation device, and the partial display state is information that can be displayed without using all the display elements, such as time and audio device information. Used when displaying.

  The display changeover switch 3 also serves as a display state selection unit that detects the display state of the display element 1. In this embodiment, the display changeover switch 3 detects the display state of the display element 1 selected by the driver and controls the control unit 4. Send a signal to.

  Since the lighting time integration storage unit 5 is used in a vehicle, it is preferable that the stored contents can be held even when a power switch (ignition switch) of a vehicle (not shown) is off. In this embodiment, for example, an EEPROM is stored. Adopted. The lighting time integration storage unit 5 stores a light source that is lit among a plurality of light sources 21 to 24 provided in the backlight device 2 when the display element 1 is in a partial display state, and stores the lighting time. The accumulated integration time is stored.

  The control unit 4 is composed of a microcomputer and receives the detection signal from the display changeover switch 3 to switch the display state of the display element 1. The control unit 4 turns on a predetermined light source from among the light sources 21 to 24 of the backlight device 2 when the display element 1 is in a partial display state. Then, the lighting time is measured by a counter built in the control unit 4 and stored in the lighting time integration storage unit 5, and when the integration time stored in the lighting time integration storage unit 5 exceeds a predetermined integration lighting time, For example, the light source to be turned on next is turned on when it exceeds 1 hour. That is, when the cumulative lighting time of the light source 21 exceeds 1 hour, the light source 21 is turned off and the light source 22 is turned on. The order of turning on the light sources is to control the lighting of the light sources 21 to 24 clockwise in the backlight device 2 of FIG. 1 such as the light source 21, the light source 22, the light source 24, the light source 23, and the light source 21.

  Next, the operation of this embodiment will be described. The driver switches the display state from a full screen display state such as a navigation display to a partial display state such as a time display by a display changeover switch 3. The control unit 4 receives the detection signal from the display changeover switch 3, and selects the light source that was lit in the previous partial display state from the plurality of light sources 21 to 24 and the accumulated time thereof as the lighting time accumulated storage unit 5. , And turn off the light sources other than the light source that was turned on last time. For example, if the light source 22 has been lit for 45 minutes in the previous partial display state, the light source 22 is lit in the current lighting as in the previous time. In the display element 1, the control unit 4 performs control so that display is performed in the display area of the display element 1 corresponding to the light source 22.

  In the previous partial display state, since the light source 22 has been lit for 45 minutes, the integrated lighting time exceeds 1 hour 15 minutes after the light source 22 is turned on this time. The stored accumulated time is erased, the light source 22 is turned off, the light source 24 in the lighting order is turned on, and the lighting time accumulated storage unit 5 stores data obtained by integrating the lighting time. At this time, in the display element 1, the control unit 4 performs control so that display is stopped in the display area of the display element 1 corresponding to the light source 22 and display is performed in the display area of the display element 1 corresponding to the light source 24. Hereinafter, when the accumulated lighting time exceeds 1 hour, the light source to be turned on is switched in the order of the light source 23, the light source 21, and the light source 22 after the light source 24. As the light sources 21 to 24 are switched, display is performed. The display area used in the element 1 is also switched.

  With the above configuration, the number of light sources 21 to 24 to be lit is reduced, so that power consumption is reduced. In addition, the display element 1 is easy to use by displaying information and the light sources 21 to 24 to be lit. By switching the light source, the light sources 21 to 24 can be used evenly, it is possible to prevent only a specific light source from continuing to be lit, and the light sources 21 to 24 are consumed evenly, whereby the lifetime of the backlight device 2 Can be provided.

  Similarly to the light sources 21 to 24, the display element 1 can equally use the display area of the display element 1 by changing the display area when the light sources 21 to 24 are changed. Therefore, it is possible to provide a display device capable of extending the life of the display element 1 by preventing the display device from being continuously driven and consuming the display area evenly. In this embodiment, the time for switching the light sources 21 to 24 is 1 hour. However, the time is not limited to 1 hour, and may be set as appropriate.

  In this embodiment, the number of light sources that are turned on when the display element 1 is partially displayed is one. However, the present invention is not limited to this embodiment, and for example, two light sources are turned on simultaneously. You may do it. In this case, the combinations of the light sources 21 to 24 include the light sources 21 and 22 that divide the light source into two upper and lower parts, the combination of the light sources 23 and 24, the light sources 21 and 23 that divide the light source into two left and right, and the light sources 22 and 24. There are combinations.

  In some cases, data does not exist in the lighting time integration storage unit 5. At this time, the control unit 4 is set to light up from a predetermined light source, for example, the light source 21.

  Next, a case where the second embodiment of the display device of the present invention is adopted in a vehicle navigation apparatus as in the first embodiment will be described as an example. In addition, the same code | symbol is attached | subjected to the same and equivalent part as 1st Example, and the detailed description is abbreviate | omitted.

  A display device 200 according to the present embodiment includes a display element 1, a backlight device 2 including light sources 21 to 24 that illuminate the display element 1, a display changeover switch 3 that switches a display state of the display element 1, and a display element. 1 and the backlight device 2, and a lighting time integration storage unit 51 that integrates the lighting times of the light sources 21 to 24 of the backlight device 2.

  The lighting time integration storage unit 51 employs an EEPROM as in the first embodiment. The lighting time integration storage unit 51 holds data obtained by integrating the lighting times of the plurality of light sources 21 to 24 provided in the backlight device 2 when the display element 1 is in a partial display state. In particular, in this embodiment, when the display element 1 is in a partial display state, data obtained by integrating the time during which the light sources 21 to 24 are lit is held. With this configuration, the number of times of rewriting of the EEPROM is reduced, and the cost can be reduced by employing an inexpensive EEPROM. However, the light sources 21 to 24 can be connected regardless of the display state of the display element 1. You may make it hold | maintain lighting time.

  The control unit 41 is formed of a microcomputer, and switches the display state of the display element 1 in response to a detection signal from the display changeover switch 3. Moreover, when the display element 1 is in a partial display state, the control unit 41 causes the lighting times of the light sources 21 to 24 to be equal among the light sources 21 to 24 of the backlight device 2. Further, based on the accumulated time of each light source 21 to 24 stored in the lighting time accumulation storage unit 51, the light source that is preferentially turned on from the light source with the shortest accumulated time is determined and turned on. In addition, when a predetermined time elapses after the light source is turned on, the light source is switched to the light source with the shortest integration time.

  Next, the operation of this embodiment will be described. The driver switches the display state from a full screen display state such as a navigation display to a partial display state such as a time display by the display changeover switch 3. The control unit 4 receives the detection signal of the partial display state from the display changeover switch 3 and gives priority to the light source with the shortest integration time based on the integration time of each light source stored in the lighting time integration storage unit 5. The light source to be turned on is determined, and the selected light source is turned on. And in the display element 1, the control part 41 controls so that it displays on the display area | region of the display element 1 corresponding to the selected light source.

  Then, one hour after the light source is turned on, the control unit 41 again switches to the light source with the shortest integration time. At this time, in the display element 1, the control unit 41 controls so that display is stopped in the display area of the display element 1 corresponding to the light source, and display is performed in the display area of the display element 1 corresponding to the next selected light source. I do.

  The switching of the light source is not limited to the above-described embodiment. For example, the selected light source is kept on until the display state of the display element 1 is switched, and the display element 1 is again displayed on the full screen. When the partial display state is changed from the display state, a light source that is preferentially turned on from the light source with the shortest integration time may be determined, and the selected light source may be turned on.

  When there are two or more light sources with the shortest integration time, the control unit 4 may collate with a predetermined order and turn on the corresponding light source. For example, the lighting order is determined as light source 21, light source 22, light source 23, and light source 24, and light source 22 is turned on when the integration time of the two light sources of light source 22 and light source 24 is the shortest.

  With the above configuration, the number of light sources 21 to 24 to be lit is reduced, so that power consumption is reduced. In addition, the display element 1 is easy to use by displaying information and the light sources 21 to 24 to be lit. By switching the light source, the light sources 21 to 24 can be used evenly, it is possible to prevent only a specific light source from continuing to be lit, and the light sources 21 to 24 are consumed evenly, whereby the lifetime of the backlight device 2 Can be provided.

  Similarly to the light sources 21 to 24, the display element 1 can equally use the display area of the display element 1 by changing the display area when the light sources 21 to 24 are changed. Therefore, it is possible to provide a display device capable of extending the life of the display element 1 by preventing the display device from being continuously driven and consuming the display area evenly.

  As described above, in each of the above-described embodiments, only the vehicle navigation device is illustrated. However, the present invention is not limited to the above-described embodiment, and any display device may be used as long as the display device includes a plurality of light sources. For example, you may use for the mileage accumulator of the instrument apparatus for vehicles mentioned by the prior art, a warning display apparatus, etc.

  In each of the above embodiments, the number of light sources provided in the backlight device 2 is four. However, the number of light sources is not limited to the above embodiment. May be set as appropriate. Further, the light source is not limited to the light emitting diode, and any light source may be adopted as long as the display element 1 can be illuminated.

  In each of the above embodiments, light emitting diodes are used for the light sources 21 to 24. However, the present invention is not limited to the above embodiment, and an incandescent lamp, a cold cathode tube, or the like may be used.

The block diagram of 1st Example of this invention. The block diagram of 2nd Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Display element 2 Backlight apparatus 3 Display changeover switch (display state selection part)
4, 41 Control unit 5, 51 Lighting time integration storage unit 21, 22, 23, 24 Light source 100, 200 Display device

Claims (3)

A display element that can be displayed using only a part of the screen, a plurality of light sources that illuminate the display element, an arbitrary light source among the plurality of light sources is lit, and the lit light source And a control unit that performs display in a display area of the corresponding display element. A display element, a plurality of light sources for illuminating the display element, and a display for selecting a full screen display state using the full screen of the display element or a partial display state using only a part of the screen of the display element A state selection unit, a lighting time integration storage unit that stores data obtained by integrating the light source and its lighting time when the display element is in a partial display state, and a partial display state selected by the display state selection unit In the display area of the display element corresponding to the lit light source, the light source stored in the lighting time accumulation storage unit is turned on and the light source that is lit at a predetermined time is switched. A display device comprising: a control unit that performs display. A display element, a plurality of light sources for illuminating the display element, and a display for selecting a full screen display state using the full screen of the display element or a partial display state using only a part of the screen of the display element A state selection unit, a lighting time integration storage unit for storing data obtained by integrating the lighting times of the plurality of light sources, and lighting times of the plurality of light sources when a partial display state is selected by the display state selection unit In the lighting time integration storage unit, a light source that is preferentially turned on from a light source with a short integration time is determined in the lighting time integration storage unit, and the display element corresponding to the determined light source And a control unit that performs display in the display area.

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