JP6057367B2 - Lighting control device, lighting control method, lighting control program, and storage medium - Google Patents

Description

  The present invention relates to an illumination control device that controls an illumination device that illuminates a non-light emitting display unit such as a liquid crystal display unit, an illumination control method, an illumination control program, and a storage medium.

  In recent years, non-light emitting display units such as liquid crystal display units have been widely adopted as display units for portable devices. A portable device using such a non-light emitting display unit includes an illumination device such as a backlight device that illuminates the display unit. Since the lighting device consumes a large amount of power, a power saving technique for reducing the power consumption of the lighting device has been conventionally proposed (for example, Patent Document 1).

  In Patent Document 1, the number of characters displayed on the display screen (the number of display characters) is counted. When the number of display characters is large, the lighting time of the backlight device is lengthened, and when the number of display characters is small, the backlight device. A technique for reducing the power consumption of the backlight device by shortening the lighting time is disclosed.

  In Patent Document 1, assuming that the number of displayed characters is proportional to the time required for the user to read the characters, the lighting time of the backlight device is controlled according to the number of displayed characters, thereby reducing unnecessary lighting time. And power consumption is reduced.

JP 2009-004981 A

  However, in Patent Document 1, since the lighting time of the backlight device is controlled based on the number of displayed characters, one character or a small number of characters are enlarged and displayed on the entire display area when checking how to write kanji in an electronic dictionary. When the backlight device (that is, the illumination) is turned on in a state where the backlight device is turned on, the backlight device is turned off in a time shorter than the time assumed by the user.

  Therefore, the present invention has been made in view of the above-described problems, and even if the illumination is turned on in a state where one character or a small number of characters are enlarged and displayed on the entire display area, the time expected by the user is obtained. An object of the present invention is to provide an illumination control device, an illumination control method, an illumination control program, and a storage medium that can prevent the illumination from being turned off in a shorter time.

  In order to solve the above-described problems, the illumination control device of the present invention includes a non-luminous display unit having a display area and displaying characters in the display area, illumination means for illuminating the display unit, and the display Area calculating means for determining a character area occupied by characters displayed in the area and a display area that is the area of the display area; area ratio calculating means for determining an area ratio of the character area to the display area; and Control means for setting the lighting time so that the lighting time of the lighting means becomes longer as the value is larger, and lighting the lighting means based on the set lighting time.

  The illumination control apparatus according to the present invention is the illumination control apparatus described above, wherein the area calculation unit obtains an area of a minimum rectangular area including all characters displayed in the display area as the character area.

  The illumination control device according to the present invention is the illumination control device described above, wherein the area calculation unit is a character dot that is a total number of dots constituting all characters displayed in the display area as the character area. The total number is obtained, and the total number of dots that are the total number of dots in the display area is obtained as the display area.

  The illumination control device according to the present invention is the illumination control device described above, further comprising display control means for enlarging and displaying the display area, and the control means is configured to display the display area while the illumination means is lit. When the number of characters enlarged and displayed in the display area is less than a predetermined number, the lighting time of the illumination unit becomes longer as the total number of strokes of all characters enlarged and displayed in the display area increases. Then, the lighting time is reset so that the lighting means is turned off based on the reset lighting time.

  The illumination control device according to the present invention is the illumination control device described above, further comprising display control means for enlarging and displaying the display area, and the control means is configured to display the display area while the illumination means is lit. When the number of characters enlarged and displayed in the display area is less than a predetermined number, the maximum number of strokes is calculated from the number of strokes of each character enlarged and displayed in the display area. The lighting time is reset so that the lighting time of the illuminating means becomes longer as the number increases, and the illuminating means is turned off based on the reset lighting time.

The illumination control method of the present invention includes an area calculating step for obtaining a character area occupied by a character displayed in a display area of a non-light emitting display unit and a display area which is an area of the display area, and the character corresponding to the display area An area ratio calculating step for obtaining an area ratio of the area, and the lighting time is set so that the lighting time of the illuminating means for illuminating the display unit increases as the area ratio increases, and the lighting time is set based on the set lighting time. And a control step of turning on the illumination means.

  The illumination control device may be realized by a computer. In this case, an illumination control program for realizing the illumination control device by a computer by causing the computer to operate as each unit of the illumination control device, and A computer-readable storage medium storing it is also within the scope of the present invention.

  According to the illumination control device, the illumination control method, the illumination control program, and the storage medium of the present invention, even if the illumination is turned on in a state where one character or a small number of characters are enlarged and displayed on the entire display area, the user It is possible to prevent the illumination from being turned off in a shorter time than expected.

1 is a schematic configuration diagram of a mobile device according to a first embodiment of the present invention. It is the figure which showed the example of a display of the display screen of a display part. It is the figure which showed the example of a display of the display screen of a display part. It is the figure which showed the example of a display of the display screen of a display part. It is the figure which showed an example of the correspondence of area ratio and backlight lighting time. It is the figure which showed the example of the enlarged display of the display screen of a display part. It is the figure which showed the example of the enlarged display of the display screen of a display part. It is the figure which showed the example of the enlarged display of the display screen of a display part. It is the figure which showed an example of the correspondence of total stroke number and backlight lighting time. It is a flowchart explaining operation | movement of the portable apparatus which concerns on 1st Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<< First Embodiment >>
<Description of configuration>
FIG. 1 is a schematic configuration diagram of a portable device equipped with the illumination control device according to the first embodiment, and FIGS. 2 to 4 are diagrams showing display examples of the display screen of the display unit. FIG. 6 is a diagram showing an example of a correspondence relationship between the area ratio and the backlight lighting time, and FIGS. 6 to 8 are examples of enlarged display of the display screen of the display unit, respectively, and FIG. It is the figure which showed an example of the correspondence with a backlight lighting time.

  As shown in FIG. 1, the mobile device 1 according to this embodiment is configured as an electronic dictionary that searches for the meaning of characters input by the operation of the operation input unit 9 and displays the search results, for example. Characters such as dictionary function search results are displayed in the display area 2b (see FIG. 2) of the non-luminous display unit 2, and the area of the display area 2b (hereinafter referred to as the display area) is displayed for the displayed characters. The area ratio K (= Sb / Sa) of the area occupied by characters with respect to Sa (hereinafter referred to as character area) Sb is obtained, and as the area ratio K increases, the illumination device (illuminating means) illuminates the display unit 2 ) The lighting time is set so that the lighting time of 3 becomes longer. Hereinafter, the portable device 1 will be described in detail.

  The portable device 1 includes a liquid crystal display unit (hereinafter referred to as a liquid crystal display unit 2) that is an example of a non-light emitting display unit 2, and a backlight device (hereinafter referred to as a backlight device 3) that is an example of an illumination device 3. A display control unit (display control unit) 4 that controls the display of the liquid crystal display unit 2, an area calculation unit (area calculation unit) 5 that calculates a display area Sa and a character area Sb of the liquid crystal display unit 2, and a display An area ratio calculation unit (area ratio calculation means) 6 for obtaining an area ratio K (= Sb / Sa) of the character area Sb to the area Sa, a character recognition unit 7 for recognizing characters displayed on the liquid crystal display unit 2, and The storage unit 8 storing data necessary for various processes, the operation input unit 9 for inputting the operation of the mobile device 1, the meaning of the search target character input by the operation of the operation input unit 9, and the like. Search unit 10 for searching, and each of these components 1-1 Control unit for controlling and a (control means) 11.

  The operation input unit 9 includes, for example, a character input key 9a for inputting a search target character, a lighting key 9b for lighting the backlight device 3, an enlargement key 9c for enlarging the display area 2b of the liquid crystal display unit 2, and a reduced display. A reduction key 9d, a scroll key 9e for scrolling the display area 2b of the liquid crystal display unit 2 up, down, left and right are provided.

  The enlargement key 9c is, for example, a push button. The longer the enlargement key 9c is pressed, the larger the display area 2b of the liquid crystal display unit 2 is displayed. The reduction key 9d is, for example, a push button. The longer the reduction key 9d is pressed, the smaller the display area 2b of the liquid crystal display unit 2 is displayed. The reduction key 9d is used, for example, to return the display area 2b enlarged and displayed with the enlargement key to the original display size.

  In the operation input unit 9, the display area 2b is enlarged by the operation of the enlargement key 9c, and then the display area 2b is scrolled in a desired direction by the operation of the scroll key 9e. The user's desired character can be enlarged and displayed.

  For example, as shown in FIG. 2, the liquid crystal display unit 2 has a rectangular display screen 2a in a dot matrix display system. In the display screen 2a, for example, a rectangular display area 2b in which characters input by the operation of the operation input unit 9 or a search result of the dictionary function of the portable device 1 is displayed is set.

  The backlight device 3 is disposed on the back side of the liquid crystal display unit 2. Lighting / extinguishing of the backlight device 3 is controlled by the control unit 11. In the lighting state, the backlight device 3 uniformly illuminates the entire surface of the display screen 2 a from the back side of the liquid crystal display unit 2 and illuminates the display screen 2 a toward the front side of the liquid crystal display unit 2.

  A transflective reflector (not shown) is disposed between the backlight device 3 and the liquid crystal display unit 2. Under an environment where the surroundings are bright, the reflection plate reflects external light incident on the front surface of the display screen 2a from the outside to the front side of the display screen 2a, and illuminates the display screen 2a. On the other hand, in an environment where the surroundings are dark, the display screen 2 a is illuminated by the lighting of the backlight device 3 by the operation of the operation input unit 9.

  The display control unit 4 displays the search target character and the search result of the search unit 10 on the liquid crystal display unit 2 under the control of the control unit 11. Further, the display control unit 4 enlarges or reduces the display area 2b of the liquid crystal display unit 2 and scrolls the display area 2b of the liquid crystal display unit 2 in a predetermined direction under the control of the control unit 11.

  Under the control of the control unit 11, the search unit 10 uses the search database stored in the storage unit 8 to search the meaning of the search target character input by the operation of the operation input unit 9. The search result is output to the control unit 11.

  For example, as shown in FIG. 2, the area calculating unit 5 is the smallest rectangular area (hereinafter referred to as the smallest rectangular area) that can surround all characters displayed in the display area 2 b in the display area 2 b of the liquid crystal display section 2. W) is set, and the area occupied by the smallest rectangular area W is obtained as the character area Sb of the characters displayed in the display area 2b. Moreover, the area calculation part 5 calculates | requires the display area Sa of the display area 2b based on the size of the display area 2b, for example. Here, since the display area Sa of the display region 2b is a fixed value, it is set in advance as a fixed value, and the area calculation unit 5 uses the fixed value as the display area Sa.

  The area ratio calculation unit 6 uses the display area Sa and the character area Sb obtained by the area calculation unit 5 to obtain an area ratio K (= Sb / Sa) of the character area Sb to the display area Sa.

  The character recognition unit 7 recognizes the characters displayed in the display area 2b by, for example, image processing, and the number of characters (number of characters) displayed in the display area 2b and the total number of strokes (that is, the number of strokes of each character). (Sum). Here, the stroke number information (character stroke number information) of various characters is stored in the storage unit 8, and the character recognition unit 7 detects the stroke number of each character recognized based on the character stroke number information. Then, the sum of the detected number of strokes is calculated to detect the total number of strokes.

  When the character to be searched is input by operating the character input key 9a, the control unit 11 controls the display control unit 4 to display the character on the display area 2b of the liquid crystal display unit 2 on the liquid crystal display unit 2. At the same time, the search unit 10 is controlled to search the meaning of the character using the search database stored in the storage unit 8. When the search by the search unit 10 ends, the control unit 11 controls the display control unit 4 to display the search result in the display area 2b of the liquid crystal display unit 2.

  Further, when the lighting key 9b of the backlight device 3 is operated, the control unit 11 performs the following processes (a1) to (a3) to set the lighting time of the backlight device 3, and from the setting time The backlight device 3 is turned on until the set lighting time has elapsed.

  (A1) The control unit 11 controls the area calculation unit 5 to obtain the character area Sb of the characters displayed in the display region 2b of the liquid crystal display unit 2 and the display area Sa of the display region 2b.

  (A2) The control unit 11 controls the area ratio calculation unit 6 to obtain the area ratio K of the character area Sb to the display area Sa using the display area Sa and the character area Sb obtained by the area calculation unit 5. Let

  (A3) The control unit 11 sets the lighting time of the backlight device 3 so that the lighting time of the backlight device 3 becomes longer as the area ratio K obtained by the area ratio calculation unit 6 is larger. More specifically, the storage unit 8 stores a first correspondence table in which the area ratio K and the lighting time (backlight lighting time) are associated with each other. In the first correspondence table, for example, as shown in FIG. 5, the area ratio K and the lighting time are associated with each other so that the lighting time becomes longer as the area ratio K increases. In the first correspondence table, for example, in the case of the display screens of FIGS. 2 to 4, the area ratio K increases in the order of FIGS. 2, 3, and 4. growing. The controller 11 sets the lighting time corresponding to the area ratio K obtained by the area ratio calculator 6 as the lighting time of the backlight device 3 based on the first correspondence table. For example, when the area ratio K = 0.3, the lighting time is 30 seconds based on the first correspondence table.

  Further, when the enlargement key 9c is operated, the control unit 11 controls the display control unit 4 to enlarge and display the display area 2b of the liquid crystal display unit 2 at an enlargement ratio proportional to the long press time of the enlargement key 9c. In addition, when the reduction key 9d is operated, the display control unit 4 is controlled to reduce the display area 2b of the liquid crystal display unit 2 at a reduction rate that is inversely proportional to the long press time of the reduction key 9d. In addition, when the scroll key 9e is operated, the control unit 11 controls the display control unit 4 to scroll the display area 2b in the direction specified by the scroll key 9e.

  Further, when the display area 2b is enlarged and displayed while the backlight device 3 is lit, the control unit 11 enlarges a part of the characters displayed in the display area 2b over the entire display area 2b. When displayed, the following processing (b1) to (b4) is performed to reset the lighting time of the backlight device 3, and from the resetting time until the reset lighting time elapses. The light device 3 is turned on.

  (B1) The control unit 11 controls the character recognizing unit 7 to detect the number of characters that are enlarged and displayed in the display area 2b (that is, the part of the characters).

  (B2) Based on the result of the number of characters detected by the character recognition unit 7, the control unit 11 determines whether or not the number of characters enlarged and displayed in the display area 2b is a predetermined number (for example, three characters) or more. I do.

  (B3) As a result of the above determination, if the number of characters in the enlarged display is not equal to or greater than the predetermined number, the control unit 11 controls the character recognition unit 7 to display the total number of strokes in the enlarged display ( That is, the total number of strokes of each character is detected.

  (B4) The control unit 11 resets the lighting time of the backlight device 3 so that the lighting time of the backlight device 3 becomes longer as the total number of strokes detected by the character recognition unit 7 increases (that is, the character is difficult). Set. More specifically, the storage unit 8 stores a second correspondence table in which the total number of strokes and the lighting time are associated with each other. In the second correspondence table, for example, as shown in FIG. 9, the total number of strokes and the lighting time (backlight lighting time) are associated with each other so that the lighting time becomes longer as the total number of strokes increases. For example, in the display screens of FIGS. 6 to 7, the total number of strokes increases in the order of FIGS. 8, 7, and 6, so that the lighting time increases in the order of FIGS. 8, 7, and 6. The control unit 11 resets the lighting time corresponding to the total number of strokes obtained by the character recognition unit 7 as the lighting time of the backlight device 3 based on the second correspondence table. For example, when the total number of strokes is 33, the lighting time is reset to 60 seconds based on FIG.

  Here, the reset lighting time is started from the resetting of the lighting time. Instead, the reset lighting time is started from the enlarged display area 2b. May be.

<Description of operation>
Next, main operations of the portable device 1 (operations for controlling lighting of the backlight device 3 (illumination control method)) will be described with reference to FIG. FIG. 10 is a flowchart for explaining main operations of the mobile device 1.

  In step S1, if the lighting key 9b is turned on (YES), the process proceeds to step S2, and if the lighting key 9b is not turned on (NO), the process returns to step S1.

  In step S2, the controller 11 detects that the lighting key 9b is turned on. When the controller 11 detects that the lighting key 9b is turned on, the area calculation unit 5 causes the character area Sb of the characters displayed on the display area 2b of the liquid crystal display unit 2 and the display area Sa of the display area 2b to be displayed. Is required. Then, the process proceeds to step S3.

  In step S3, the area ratio calculation unit 6 calculates the area ratio K (= Sb / Sa) based on the display area Sa and the character area Sb obtained by the area calculation unit 5. Then, the process proceeds to step S4.

  In step S4, the control unit 11 selects and selects the lighting time corresponding to the area ratio K obtained by the area ratio calculation unit 6 based on the first correspondence table stored in the storage unit 8. The lighting time is set as the lighting time of the backlight device 3. Then, the process proceeds to step S5.

  In step S <b> 5, the backlight device 3 is turned on by the control unit 11. Then, the process proceeds to step S6.

  In step S6, the controller 11 starts measuring the lighting time set in step S4 from the lighting of step S5. Then, the process proceeds to step S7.

  In step S7, if the time measurement in step 6 is completed, the process proceeds to step S8. On the other hand, if the time measurement in step 6 is not completed, the process proceeds to step S9.

  In step S8, the backlight unit 3 is turned off by the control unit 11, and the process ends.

  In step S9, when the enlargement key 9c is not operated while the backlight device 3 is lit (NO), the process returns to step S7. On the other hand, when the enlargement key 9c is operated while the backlight device 3 is lit (YES). ) Proceeds to step S10.

  In step S10, the display area 2b of the liquid crystal display unit 2 is enlarged and displayed by the display control unit 4 at an enlargement ratio proportional to the long press time of the enlargement key 9c. Then, the process proceeds to step S11.

  In steps S9 and S10, for convenience of explanation, it is assumed that only the operation of the enlargement key 9c is performed and a certain character is enlarged and displayed on the entire display area 2b, but the enlargement key 9c, the reduction key 9d, and the scroll key The desired characters may be enlarged and displayed on the entire display area 2b by combining the operations of 9e.

  In step S <b> 11, the character recognition unit 7 detects the number of characters displayed in the display area 2 b of the liquid crystal display unit 2. Then, the control unit 11 determines whether or not the number of characters detected by the character recognition unit 7 is a predetermined number (for example, three characters) or more. As a result of the determination, if the number of characters is equal to or greater than the predetermined number (YES), the process returns to step S7. On the other hand, if the number of characters is not equal to or greater than the predetermined number (NO), the process proceeds to step S12.

  In step S <b> 12, the character recognition unit 7 detects the total number of strokes of characters displayed in the display area 2 b of the liquid crystal display unit 2. Then, the process proceeds to step S13.

  In step S13, the control unit 11 selects a lighting time corresponding to the total number of strokes detected by the character recognition unit 7 based on the second correspondence table stored in the storage unit 8, and the selected lighting is performed. The time is reset as the lighting time of the backlight device 3. Then, the process proceeds to step S14.

  In step S14, the control unit 11 stops measuring time in step S7, and starts measuring the lighting time reset in step S13 from the reset time in step S13. Then, the process proceeds to step S15.

  In step S15, when the timing of step 14 is completed, the process proceeds to step S8, and the backlight device 3 is turned off by the control unit 11 and the process is terminated. On the other hand, the timing of step 15 is not completed. The process returns to step S15.

  Thus, in this portable device 1, the area ratio K of the character area Sb to the display area Sa of the display area 2b is obtained for the characters displayed in the display area 2b of the liquid crystal display unit 2, and the area ratio The lighting time is set so that the lighting time of the backlight device 3 becomes longer as K is larger, and the backlight device 3 is turned on based on the set lighting time (steps S 1 → S 2 → S 3 → S 4 → S5 → S6 → S7 → S8). As a result, not only when the display area 2b is not enlarged, but also when the backlight device 3 is turned on, particularly when the display area 2b is enlarged, it is shorter than the time expected by the user. It is possible to prevent the backlight device 3 from being turned off over time.

  If the display area 2b is enlarged and the number of characters displayed in the display area 2b is less than a predetermined number while the backlight device 3 is lit, the total number of strokes of all the enlarged characters is large. The lighting time is reset so that the lighting time of the backlight device 3 becomes longer, and when the reset lighting time elapses, the backlight device 3 is turned on (steps S9 → S10 → S11 → S12 → S13 → S14 → S15 → S8). As a result, a more optimal lighting time is reset based on the total number of strokes of all characters displayed in an enlarged manner, so that the backlight device 3 can be further lighted for the time expected by the user.

  In this embodiment, the backlight device 3 is turned on by turning on the lighting key 9b. However, the backlight device 3 may be automatically turned on when characters are displayed in the display area 2b.

<Main effects>
According to the portable device 1 configured as described above (accordingly, the illumination control device and the illumination control method), the lighting time of the backlight device 3 becomes longer as the area ratio K of the character area Sb to the display area Sa is larger. Since the lighting time of the backlight device 3 is set and the backlight device 3 is turned on based on the set lighting time, the backlight device 3 is displayed in a state where one character or a small number of characters are enlarged on the entire display area 2b. Even if the light device 3 is turned on, the backlight device 3 can be prevented from being turned off in a time shorter than the time expected by the user.

  Here, assuming that the area ratio K increases, the amount of information displayed in the display region 2b increases, and the time required for the user to read the information also increases. The lighting time of the backlight device 3 is set so that the lighting time of the backlight device 3 becomes longer as the value becomes larger.

  Further, since the area of the minimum rectangular area W including all the characters displayed in the display area 2b is obtained as the character area Sb, the character area Sb can be easily estimated.

  When the display area 2b is enlarged and the number of characters enlarged and displayed in the display area 2b is less than a predetermined number, the backlight device 3 is turned on as the total number of strokes of all the enlarged characters increases. Since the lighting time is reset so that the time becomes longer and the backlight device 3 is turned off based on the reset lighting time, the time as expected by the user (that is, expected by the user). The backlight device 3 can be turned off in a time shorter or shorter than the time).

  Here, it is assumed that the larger the total number of characters displayed, the more time it takes for the user to read, and the larger the total number of characters displayed, the more the backlight device 3 has. The lighting time of the backlight device 3 is set so that the lighting time becomes long.

<< Modification 1 >>
In the first embodiment, the area calculation unit 5 obtains the area of the smallest rectangular area W that can enclose all characters displayed in the display area 2b as the character area Sb. The calculation unit 5 obtains the total number of dots constituting all the characters displayed in the display area 2b (hereinafter referred to as the total number of character dots) as the character area Sb. In this modification, the area calculation unit 5 obtains the total number of dots in the display area 2b (hereinafter referred to as the total number of display dots) as the display area Sa, and displays the total number of display dots as the area ratio K (= Sb / Sa). The dot ratio of the total number of character dots for is calculated.

  According to this configuration, the total number of characters that is the total number of dots constituting all characters displayed in the display area 2b is obtained as the character area Sb, and the total number of dots in the display area 2b is obtained as the display area Sa. Since the total number of display dots can be obtained, the area ratio K of the character area Sb to the display area Sa can be accurately obtained.

<< Modification 2 >>
In the first embodiment, when the number of characters enlarged and displayed in the display area 2b is not equal to or larger than a predetermined number, the character recognition unit 7 determines the total number of characters (that is, the number of strokes of each character). The lighting time is set so that the lighting time of the backlight device 3 becomes longer as the sum (total) increases. In this modification, the character recognition unit 7 sets the maximum number of strokes of each enlarged character. (Maximum number of strokes) is determined, and the lighting time is set so that the lighting time of the backlight device 3 becomes longer as the maximum number of strokes increases.

  According to this configuration, when the backlight device 3 is turned on, when the display area 2b is enlarged and the number of characters enlarged and displayed in the display area 2b is less than a predetermined number, The maximum number of strokes of character strokes is obtained, and the lighting time is reset so that the lighting time of the backlight device 3 becomes longer as the maximum number of strokes increases, and the backlight device 3 is set based on the reset lighting time. Is turned off, the backlight device 3 can be turned off in a time as expected by the user (that is, a time shorter or shorter than the time expected by the user).

  Here, it is assumed that the larger the maximum number of strokes of each displayed character, the longer the time required for the user to read, and the larger the maximum number of strokes, the more the backlight device 3 is turned on. The lighting time of the backlight device 3 is set so as to increase the time.

<< Modification 3 >>
Each functional block of the mobile device 1 (that is, the lighting control device) of the first embodiment, particularly the display unit 2, the lighting device 3, the display control unit 4, the area calculation unit 5, the area ratio calculation unit 6, the character recognition unit 7, and the memory The unit 8, the operation input unit 9, the search unit 10, and the control unit 11 may be configured by hardware logic, or may be realized by software using a CPU as follows.

  That is, the mobile device 1 includes a CPU that executes instructions of a control program (lighting control program) that realizes each function, a ROM that stores the control program, a RAM that expands the control program, the control program, and various data. A storage device (recording medium) such as a memory for storing is provided. And the recording medium which recorded the program code of the control program of the portable device 1 which is software which implement | achieves each function of the portable device 1 so that reading by a computer is supplied to the portable device 1, and the computer of the portable device 1 records a recording medium The portable device 1 is realized by reading and executing the program code recorded in the.

  Examples of the recording medium include tapes such as magnetic tapes and cassette tapes, magnetic disks such as floppy (registered trademark) disks / hard disks, and disks including optical disks such as CD-ROM / MO / MD / DVD / CD-R. Card system such as IC card, IC card (including memory card) / optical card, or semiconductor memory system such as mask ROM / EPROM / EEPROM / flash ROM.

  The portable device 1 may be configured to be connectable to a communication network, and the program code may be supplied via the communication network. The communication network is not particularly limited. For example, the Internet, intranet, extranet, LAN, ISDN, VAN, CATV communication network, virtual private network, telephone line network, mobile communication network, satellite communication. A net or the like is available. Further, the transmission medium constituting the communication network is not particularly limited. For example, even in the case of wired such as IEEE 1394, USB, power line carrier, cable TV line, telephone line, ADSL line, etc., infrared rays such as IrDA and remote control, Bluetooth ( (Registered trademark), 802.11 wireless, HDR, mobile phone network, satellite line, terrestrial digital network, and the like can also be used. The present invention can also be realized in the form of a computer data signal embedded in a carrier wave in which the program code is embodied by electronic transmission.

≪Attached matters≫
As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to such an example. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. It is understood.

  Moreover, it is understood that the invention combining any two or more of the first embodiment, the first modification, the second modification, and the third modification belongs to the technical scope of the present invention.

  The present invention is most suitable for application to a portable device (for example, an electronic dictionary) including an illumination control device that controls an illumination device that illuminates a non-light emitting display unit.

1 Mobile device 2 Liquid crystal display (display)
2b Display area 3 Backlight device (illumination means)
4. Display control unit (display control means)
5 Area calculation part (Area calculation means)
6 Area ratio calculation hand (Area ratio calculation means)
11 Control unit (control means)
K Area ratio Sa Display area Sb Character area W Minimum rectangular area

Claims (8)

A non-luminous display unit having a display area and displaying characters in the display area;
Illuminating means for illuminating the display unit;
Area calculating means for obtaining a display area which is a character area occupied by characters displayed in the display area and an area of the display area;
Area ratio calculating means for obtaining an area ratio of the character area to the display area;
The control means for setting the lighting time so that the lighting time of the lighting means becomes longer as the area ratio is larger, and lighting the lighting means based on the set lighting time;
An illumination control device comprising: The illumination control device according to claim 1,
The area calculation means determines the area of a minimum rectangular area including all characters displayed in the display area as the character area. The illumination control device according to claim 1,
The area calculating means obtains a total number of characters that is the total number of dots constituting all characters displayed in the display area as the character area, and displays the total number of dots in the display area as the display area. An illumination control device characterized by obtaining a total number of dots. The illumination control device according to any one of claims 1 to 3,
A display control means for enlarging and displaying the display area;
The control means displays an enlarged display in the display area when the display area is enlarged and the number of characters enlarged in the display area is less than a predetermined number while the lighting means is turned on. The lighting control device resets the lighting time so that the lighting time of the lighting unit becomes longer as the total number of strokes of all the characters is increased, and turns off the lighting unit based on the reset lighting time . The illumination control device according to any one of claims 1 to 3,
A display control means for enlarging and displaying the display area;
The control means displays an enlarged display in the display area when the display area is enlarged and the number of characters enlarged in the display area is less than a predetermined number while the lighting means is turned on. The number of strokes of each character is calculated, the lighting time is reset so that the lighting time of the lighting means becomes longer as the maximum number of strokes increases, and the lighting means is set based on the reset lighting time. A lighting control device that is turned off. An area calculation step for obtaining a character area occupied by characters displayed in a display area of a non-light emitting display unit and a display area which is an area of the display area;
An area ratio calculating step for obtaining an area ratio of the character area to the display area;
A control step of setting the lighting time so that the lighting time of the lighting means for illuminating the display unit becomes longer as the area ratio is larger, and lighting the lighting means based on the set lighting time;
An illumination control method comprising:   A lighting control program for causing a computer to function as the lighting control device according to any one of claims 1 to 5, wherein the lighting control program causes the computer to function as each of the above means.   A computer-readable storage medium storing the illumination control program according to claim 7.

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