JP2009157045A - Display arrangement and its power control program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display arrangement capable of achieving both of reduction of power consumption and user convenience, and its power control program. <P>SOLUTION: The arrangement comprises a LCD 70 for displaying information on a screen, a backlight device for radiating light from the rear side of the LCD 70 for illuminating the LCD 70, and a power manager 14c for controlling lighting of the backlight device. The backlight device comprises light sources divided into a plurality of blocks. The power manager 14c individually controls first lighting, second lighting with a brightness lower than that of the first lighting, and extinguishment of the light source in each block, and allows the first lighting, the second lighting or the extinguishment of first-third regions A1-A3 of the LCD 70 corresponding to each block. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a display device and a power control program therefor, and more particularly to a display device capable of achieving both user convenience and power consumption reduction and a power control program therefor.

  A display device that performs display using an LCD (Liquid Crystal Display) screen using liquid crystal has many advantages such as being easy to miniaturize. ing. In these liquid crystal display devices, a backlight device that performs illumination from the back of the display screen is required. As such a backlight device, for example, a device using a fluorescent tube is used, and in particular, when it is necessary to reduce the size and the thickness, an LED or an EL (Electronic Luminescence) element is used.

  In the backlight device, there is a high demand for power saving, and various power saving technologies have been proposed. For example, in Patent Document 1, in an image display device including a liquid crystal display unit and a backlight light source, the light source control unit lights only a predetermined light source body to reduce the power consumption of the backlight light source. A technique has been proposed in which only a predetermined range is irradiated and the display control unit displays an image only in a range corresponding to the irradiation range.

  Moreover, in patent document 2, in order to suppress the power consumption of the illuminating device that illuminates the screen from the back side, based on the control of the display / backlight control unit, among the three divided light sources of the backlight device, Further, a technique has been proposed in which only the light source in which an effective display area (window) of a liquid crystal display panel (LCD) exists is turned on to suppress power consumption of the backlight device.

  Further, in Patent Document 3, a backlight control device that controls turning on and off of a plurality of lighting devices arranged on a matrix on the back surface of an LCD, on the LCD based on display information generated by a CPU. A technique for illuminating only the portion of the LCD where the display is performed by specifying the display position of the displayed data with the backlight drive device and turning on only the illumination device corresponding to the specified position is proposed. Has been.

JP 2001-21863 A Japanese Patent Laid-Open No. 9-288272 Japanese Patent Laid-Open No. 11-184442

  However, since the above Patent Documents 1 to 3 divide the backlight into a plurality of parts, irradiate only a predetermined range, and turn off other areas in order to reduce power consumption, user convenience is reduced. There is a problem of being bad. That is, in Patent Documents 1 to 3, since the backlight is controlled in two stages of turning on and off to reduce power consumption, the window used by the user (active window) is turned on. Since other areas on the screen are turned off, there is a problem that other information displayed on the screen other than the window being used cannot be easily confirmed, and the user's usability is poor.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a display device capable of achieving both reduction in power consumption and user convenience and a program for controlling the power thereof.

  In order to solve the above-described problems and achieve the object, the present invention provides a display panel for displaying information on a screen and illumination for illuminating the display panel by irradiating light from the back side of the display panel. And a control means for controlling lighting of the lighting means, wherein the lighting means includes a light source divided into a plurality of blocks, and the control means includes a first lighting of the light source of each block. The second lighting, which is lower in luminance than the first lighting, and the lighting are individually controlled, and each area of the display panel corresponding to each block is turned on for the first lighting, the second lighting, or the lighting. Features.

  Further, according to a preferred aspect of the present invention, the control means, when the position instruction means for giving a position instruction on the screen moves from the first lighting area of the display panel to the extinguishing area, It is desirable to control the illuminating means so that the second lighting is performed.

  According to a preferred aspect of the present invention, when the position indicating means for giving a position instruction on the screen moves from the second lighting area of the display panel to the first lighting area, It is desirable to control the illumination means so that the second lighting area is turned off.

  Further, according to a preferred aspect of the present invention, the control means changes the size of the active window on the screen to the size of the area to be turned on, and then turns on or turns off the area other than the active window by the second time. Is desirable.

  Further, according to a preferred aspect of the present invention, there is provided battery remaining amount detecting means for detecting the remaining amount of the battery, and when the battery is driven, the first lighting of the display panel is performed based on the remaining amount of the battery. It is desirable to change the size of the area.

  Moreover, according to a preferable aspect of the present invention, it is desirable that the illuminating unit includes a line-type LED module that emits light and a reflector that reflects the light emitted from the line-type LED module.

  In order to solve the above-described problems and achieve the object, the present invention includes a display panel for displaying information on a screen, and a light source divided into a plurality of blocks, from the back side of the display panel. In a power control program mounted on a display device that illuminates the display panel by irradiating light, the first lighting of the light source of each block of the lighting means, the first lighting Second lighting and extinguishment with low brightness are individually controlled to cause the computer to execute a step of causing each area of the display panel corresponding to each block to be first illuminated, second illuminated, or extinguished. And

  According to the present invention, a display panel for displaying information on a screen, illumination means for illuminating the display panel by irradiating light from the back side of the display panel, and control for controlling lighting of the illumination means And the lighting means includes a light source divided into a plurality of blocks, and the control means includes a first lighting of the light source of each block, and a second lower luminance than the first lighting. Since the display panel corresponding to each block is controlled to be turned on first, turned on, or turned off separately, the power consumption is reduced and the convenience of the user is controlled. It is possible to provide a display device that can achieve both.

  Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same.

  FIG. 1 is a diagram showing a schematic hardware configuration example when the display device according to the present invention is applied to a battery-driven notebook personal computer. The display device according to the first embodiment includes a CPU 11, a ROM 12, a RAM 13, a HDD (hard disk) 14, a display 15, an optical drive device 16, a network card 17, an input unit 18, a USB port 19, and a battery 20, as shown in FIG. , A power controller 21, a DC-DC converter 22, an AC adapter 23, and the like, and each unit is connected via a bus.

  The CPU 11 controls the entire notebook personal computer by the multitask OS 14a stored in the HDD 14 connected via the bus, and manages functions based on various programs stored in the HDD 14. The ROM 12 stores the BIOS 12a, data, and the like. The RAM 13 has a memory function used as a work area when the CPU 11 executes various programs.

  The network card 17 is connected to a network such as the Internet and performs data communication, and manages a function of communicating with other devices using infrared rays.

  The input unit 18 is a user interface for a user to perform an input operation. The input unit 18 includes a keyboard including various keys for inputting characters, commands, etc., a mouse for moving a cursor on the screen, and selecting various menus. It has a slice pad.

  The HDD (hard disk) 14 includes, for example, a multi-task OS (multi-window OS) 14a for controlling the entire notebook personal computer such as Windows (R), various drivers 14b, a power manager 14c for controlling power consumption, and various applications. It has a function of storing the program 14d and the like.

  The AC adapter 23 is connected to a commercial power supply, converts an AC voltage into a DC voltage, and outputs the DC voltage to the DC-DC converter 22. The DC-DC converter 22 converts the DC voltage supplied from the AC adapter 23 into a predetermined voltage, supplies power to each unit, and charges the battery 20. The battery 20 is charged by the DC-DC converter 22 and supplies the charged voltage to each unit. The power controller 21 controls the operation of the battery 20 and the DC-DC converter 22. When the power controller 21 receives a request for measuring the remaining amount of the battery 20 from the power manager 14c, the power controller 21 measures the remaining amount of the battery 20 and outputs the measurement result to the power manager 14c. The battery 20 is used when the AC adapter 23 is not connected to a commercial power source.

  The display unit 16 includes a backlight controller 30, first to third LEDCs (first to third LED controllers) 40a to 40c, and first to third LEDBs (first to third LED blocks) 50a to 50a. 50c, LCD controller 60, LCD (liquid crystal display panel) 70, and the like.

  The LCD 70 is a transmissive type or a semi-transmissive type, and has a function of displaying various types of information under the control of the CPU 11. The LCD controller 60 controls the display of the LCD 60 according to the control of the CPU 11 and displays various information on the LCD 60.

  Backlight controller 30, first to third LEDCs (first to third LED controllers) 40 a to 40 c and first to third LEDBs (first to third LED blocks) composed of LED controllers 50a to 50c constitute a backlight device.

  The backlight controller 30 is based on control information (instructions for all lights, light reduction, and light-off of the first, second, and third LEDBs 50a to 50c) input from the CPU (power manager 14c) 11. The third LEDCs 40a to 40c are controlled to individually control all lights (first lighting), light reduction (second lighting), and extinguishing of the first, second, and third LEDBs 50a to 50c. The 1st-3rd LEDC40a-40c converts the DC voltage supplied from the DC / DC converter 22 into the DC voltage of about 20V-40V, and outputs it to 1st, 2nd, 3rd LEDB50a-50c, respectively. To do.

  Functions realized by the CPU 11 reading and executing the power manager 14c stored in the HDD 14 will be described with reference to FIGS. The CPU 11 functions as a control unit and a remaining battery level detection unit by executing the power manager 14c. In the following description, functions realized by the CPU 11 executing the power manager 14c will be described with the power manager 14c as an operating subject.

  The power manager 14c outputs control information (instructions for all lights, light reduction, and extinction of the first, second, and third LEDBs 50a to 50c) to the backlight controller 30, and the first, second, and second 3 LEDBs 50a to 50c are individually controlled for all lamps (first lighting), light reduction (second lighting), and extinction. Further, the power manager 14c executes a first power saving process (see FIGS. 3 to 4-2) and a second power saving process (see FIGS. 5 to 7-2) which will be described later. In the first power saving process, in the power saving mode, after changing the size and position of the active window on the screen to the size and position of the area to be lit, areas other than the active window are turned off or turned off. In the second power saving process, when the mouse cursor (position indicating means) moves from the light-reduced area of the LCD 70 to the full-light area when the battery is driven, the light-reduced area is turned off, while from the full-light area. When moving to the extinguishing area, the extinguishing area is reduced, and the size of the entire lighting area is changed according to the remaining battery level.

  FIG. 2 is a schematic diagram for explaining the configuration of the display unit 16. 1st, 2nd, 3rd LEDB50a-50b is comprised with the line type LED module. In this embodiment, the line-type LED module is divided into a plurality of (three) blocks to form first to third LEDBs 50a to 50b. The first, second, and third LEDBs 50a-50b are disposed below the back side of the LCD 70, and the light emitted from the first, second, and third LEDBs 50a-50b is disposed on the LCD 70. The entire surface of the LCD 70 is illuminated from the back side. The first to third regions A1 to A3 of the LCD 70 are illuminated by the first to third LEDs B50a to 50b and the reflecting plate, respectively. Generally, the line type LED module can be divided into blocks corresponding to the number of LEDs because about 40 to 60 LEDs are arranged in a horizontal row. In this embodiment, the block is divided into three blocks (first, second, and third LEDBs 50a to 50b). The division ratio of the first to third regions A1 to A3 when the line-type LED module is configured with, for example, 50 LEDs arranged in a horizontal row is, for example, (Example 1) A1: A2: A3 = 30 : 10:10, (Example 2) A1: A2: A3 = 25: 15: 10, (Example 3) A1: A2: A3 = 25: 10: 15, (Example 4) A1: A2: A3 = 20: 20 : 10. In this embodiment, as shown in FIG. 2, A1: A2: A3 = 25: 10: 15.

  Therefore, the power manager 14c individually controls all the lights (first lighting), light reduction (second lighting), and extinguishing of the first to third LEDs B 50a to 50b, so that the first LED 70 of the LCD 70 is controlled. The area to the third area A1 to A3 can be individually turned off (first lighting), reduced (second lighting), and extinguished individually. For example, the first to third LEDBs 50a to 50b can adjust the brightness level in a 0 (dark) to 15 (bright) stage, and the second lighting has a lower luminance level than the first lighting. It has become. For example, in the present embodiment, the first lighting (all lights) is a luminance level (for example, “10” to “15”) that allows the user to visually recognize the display screen comfortably, and the second lighting (light reduction) is The brightness level is such that the user can visually recognize the display screen (for example, “3” to “5”). In the present invention, the brightness levels of all lamps (first lighting), light reduction (second lighting), and extinguishing are not limited to this embodiment.

  Next, the first power saving process executed by the power manager 14c will be described with reference to FIGS. 3, 4-1 and 4-2. FIG. 3 is an explanatory diagram for explaining the first power saving process, and FIGS. 4A and 4B are flowcharts for explaining the first power saving process executed by the power manager 14c.

  In FIG. 3, reference numeral 100 denotes a window (active window) set as a rectangular effective display area on the screen of the LCD 70. There are a plurality of windows that can be set on the screen of the LCD 70, but there is only one window to be operated, and the window to be operated is called an active window. The active window can be selected by moving the mouse cursor and pressing (clicking) the mouse button on the target window. This window can be resized and moved by operating the mouse.

  In the figure, D1 indicates the screen display of the LCD 70 in the normal mode. In this normal mode, all areas A1 to A3 of the LCD 70 are fully lit. In this state, when the mode is shifted to the power saving mode, the position and size of the active window 100 are adjusted to the size of the entire lighting area, as indicated by D2. D2 shows a case where the first area A1 and the second area A2 are all turned on and the third area A3 is turned off, and the active window 100 corresponds to the first area A1 and the second area A2. Change the position and size. Thereafter, the third area A3 is turned off (D3). Here, the light is turned off after the size and position of the active window 100 are adjusted. However, the size and position of the active window 100 may be adjusted after the light is turned off. When the power saving mode shown in D3 is released, the third area A3 is turned off and the position and size of the active window 100 are returned to the normal mode (D1). In this way, by adjusting the position and size of the active window 100 to the position and size of the area to be turned on and turning off the other areas, the user's convenience (OS function) is consumed without loss. Electric power can be reduced. Here, the area other than the active window is turned off, but the second lighting may be used.

  The first power saving process executed by the power manager 14c will be specifically described with reference to flowcharts shown in FIGS. 4A, first, the power manager 14c determines whether or not it is in the power saving mode (step S11). If it is not the power saving mode (“No” in step S11), it is determined whether or not a condition for entering the power saving mode is satisfied (step S12). If the condition for entering the power saving mode is not satisfied (“No” in step S12), the flow ends. If the condition for entering the power saving mode is satisfied (“Yes” in step S12), the third area A3 (see FIG. 2) of the LCD 70 is turned off (step S13), and then the second area A2 It is determined whether the extinction condition is satisfied.

  When the turn-off condition for the second area A2 is not satisfied (“No” at step S14), the process proceeds to step S16, while when the turn-off condition for the second area A2 is satisfied (“Yes” at step S14). ”), After the second area A2 is turned off (step S15), the process proceeds to step S16. In step S16, the position and size of the active window are changed to the position and size of the first area A1, and the position of the mouse cursor is arranged at the center of the lighting area, and then the flow is finished.

  On the other hand, if it is the power saving mode (“Yes” in step S11), it is determined whether or not a condition for canceling the power saving mode is satisfied (step S21 in FIG. 4-2). If the condition for canceling the power saving mode is satisfied (“Yes” in step S21), the second and third areas A2 and A3 are all turned on, and the active window size is restored (step S21). S22).

  On the other hand, if the condition for canceling the power saving mode is not satisfied (“No” in step S21), it is determined whether or not the second area A2 is being turned off (step S31). When the second area A2 is light-reduced (“Yes” in step S31), the process proceeds to step S35. When the second area A2 is not light-reduced (“No” in step S31), it is determined whether the extinction condition for the second area A2 is satisfied (step S32). If the turn-off condition for the second area A2 is not satisfied (“No” in step S32), the process proceeds to step S35. When the turn-off condition of the second area A2 is satisfied (“Yes” in step S32), after turning off the second area A2 (step S33), the position and size of the active window are set to the first After changing to the size of the area A1 and placing the mouse cursor at the center of the lighting area, the process proceeds to step S35.

  In step S35, it is determined whether or not all lighting conditions in the second area A2 are satisfied. When the all-lamp condition in the second area A2 is not satisfied (“No” in step S35), the process proceeds to step S38. When the all-lamp condition of the second area A2 is satisfied (“Yes” in step S35), after the second area A2 is fully lit (step S36), the position and size of the active window are The size is changed to the sizes of the first and second areas A1 and A2 (step S37), and the process proceeds to step S38.

  In step S38, it is determined whether or not the light reduction condition of the second area A2 is satisfied. When the light reduction condition in the second area A2 is not satisfied (“No” in step S38), the process proceeds to step S40, while when the light reduction condition in the second area A2 is satisfied (in step S38). After “Yes”), the second area A2 is turned off (step S39), and then the process proceeds to step S40. In step S40, it is determined whether or not the light reduction condition of the third area A3 is satisfied. When the light reduction condition of the third area A3 is not satisfied (“No” in step S40), the process proceeds to step S23, while when the light reduction condition of the third area A3 is satisfied (in step S40). After “Yes”), the third area A3 is turned off (step S41), and then the process proceeds to step S23.

  In step S23, it is determined whether the extinction condition for the second area A2 is satisfied. When the turn-off condition for the second area A2 is not satisfied (“No” at step S23), the process proceeds to step S25, while when the turn-off condition for the second area A2 is satisfied (“Yes” at step S23). ”), After the second area A2 is extinguished (step S24), the process proceeds to step S25. In step S25, it is determined whether the extinction condition for the third area A3 is satisfied. If the turn-off condition for the third area A3 is not satisfied (“No” in step S25), the flow ends. On the other hand, if the turn-off condition for the third area A3 is satisfied (“Yes” in step S25) ”), After the third area A3 is extinguished (step S26), the flow ends.

  Next, the second power saving process executed by the power manager 14c will be described with reference to FIGS. FIGS. 5 and 6 are explanatory diagrams for explaining an example of the second power saving process, and FIGS. 7-1 and 7-2 are diagrams for explaining the second power saving process executed by the power manager 14c. It is a flowchart of.

  In FIG. 5, when the first and second areas A1 are all turned on and the third area 3 is turned off as shown at D4, the first and second areas in which the mouse cursor C1 is a lighting area. When moving from A1 and A2 to the third area A3, which is the extinguishing area, the third area A3, which is the extinguishing area, is reduced (D5). As a result, the user can visually recognize the information displayed in the third area A3, and can perform screen operations. When the mouse cursor C1 moves from the third area A3, which is a light-reduction area, to the first and second areas A1, A2, which are lighting areas, the third area A3, which is an extinguishing area, is turned off. (D4). As described above, since the turn-off / light-off lamp is changed according to the position of the mouse cursor C1, the power consumption can be reduced without impairing the user's convenience (OS function).

  In FIG. 6, when the battery remaining amount is 50% or more during battery operation, the first to third regions A1 to A3 are all turned on to perform full screen display. When the remaining battery level is 25% or more and less than 50%, the third area A3 is turned off and the screen size is set to 4: 3 (D6). If the remaining battery level is less than 25%, the second and third areas A2 and A3 are turned off and the screen size is halved (D7). Thus, by changing the size of the lighting area of the LCD 70 in accordance with the remaining battery level, it is possible to reduce power consumption without impairing user convenience (OS function). In addition, it is good also as a structure which can select the area | region to which the LCD 70 is light-extinguished.

  With reference to the flowcharts shown in FIGS. 7A and 7B, the second power saving process executed by the power manager 14c will be specifically described. 7A, first, the power manager 14c determines whether or not the battery 20 is operating (step S101). If the battery is not operating ("No" in step S101), it is determined whether or not there are areas that are extinguished or reduced in the second and third areas A2 and A3 (step S111). In the second and third areas A2 and A3, when there is no area that is extinguished or reduced ("No" in step S111), the process proceeds to step S106, while the second and third areas A2 and A3 In A3, when there is an area that is extinguished or light-reduced (“Yes” in step S111), the second and third areas A2 and A3 are completely lit (step S112), and then the process proceeds to step S106. . In step S106, after waiting for T1 seconds, the process returns to step S101 to perform the same processing.

  On the other hand, when the battery 20 is operating (“Yes” in step S101), it is determined whether one or more areas in the second and third areas A2 and A3 are all lighted (step S102). . When one or more areas in the second and third areas A2 and A3 are all lighted (“Yes” in step S102), the current remaining battery level is acquired from the power controller 21 (FIG. 7-2). Step S121). And it is judged whether a battery remaining charge is 50% or more (step S122). If the remaining battery level is 50% or more (“Yes” in step S122), the process proceeds to step S103 in FIG.

  If the remaining battery level is not 50% or more (“No” in step S122), it is determined whether the remaining battery level is 25% or more (step S123). When the remaining battery level is 25% or more (“Yes” in step S123), it is determined whether or not the third area A3 is fully lit (step S124). When the third area A3 is not in full lighting (“No” in step S124), the process proceeds to step S103 in FIG. When the third area A3 is fully lit (“Yes” in step S124), the third area A3 is turned off (step S126), and the process proceeds to step S103 in FIG. That is, when the remaining battery level is 25% or more and less than 50% during battery operation, the third area A3 is turned off and the screen size is set to 4: 3 (see FIG. 6 above).

  If the remaining battery level is not 25% or more (“No” in step S123), it is determined whether or not the second area A2 is fully lit (step S125). When the second area A2 is not in full lighting (“No” in step S125), the process proceeds to step S103 in FIG. If the second area A2 is fully lit ("Yes" in step S125), the second and third areas A2 and A3 are turned off (step S129), and then the step of FIG. The process proceeds to S103. That is, during battery operation, when the remaining battery level is less than 25%, the second and third areas A2 and A3 are turned off to halve the screen size (see FIG. 6 above).

  In step S103 of FIG. 7A, the current position of the mouse cursor C1 is acquired from the multitask OS 14a. Subsequently, it is determined whether or not the second and third regions A2 and A3 are turned off (step S104). If the second and third areas A2 and A3 are not turned off ("No" in step S104), the process proceeds to step S105.

  If the second and third areas A2 and A3 are turned off (“Yes” in step S104), it is determined whether or not the position of the mouse cursor C1 is in the second and third areas A2 and A3. (Step S141). When the position of the mouse cursor C1 is not in the second and third areas A2 and A3 (“No” in step S141), the process proceeds to step S105. If the position of the mouse cursor C1 is in the second and third areas A2 and A3 ("Yes" in step S141), the second and third areas A2 and A3 are turned off (step S142). ), The process proceeds to step S105. That is, when the mouse cursor C1 moves from the full light area of the LCD 70 to the extinguished area during battery operation, the extinguished area is reduced to make it visible to the user so that the user can use it ( (See FIG. 5 above).

  In step S105, it is determined whether or not the second and third areas A2 and A3 are light-down. When the second and third areas A2 and A3 are not light-reduced ("No" in step S105), after waiting for T1 seconds (step S106), the process returns to step S101 and the same processing is performed.

  When the second and third areas A2 and A3 are light-reduced (“Yes” in step S105), it is determined whether or not the position of the mouse cursor C1 is in the first area A1 (step S151). ). When the position of the mouse cursor C1 is not in the first area A1 (“No” in step S151), the process proceeds to step S106. When the position of the mouse cursor C1 is in the first area A1 (“Yes” in step S151), the second and third areas A1 are turned off (step S152), and the process proceeds to step S106. That is, when the mouse cursor C1 moves from the reduced light area of the LCD 70 to the full light area during battery operation, the reduced light area is turned off to reduce power consumption.

  Note that the first power saving process and the second power saving process described above may be performed in combination, or only one of them may be performed.

  As described above, according to the present embodiment, the LCD 70 for displaying information on the screen, the backlight device that illuminates the LCD 70 by irradiating light from the back side of the LCD 70, and the lighting of the backlight device are controlled. The backlight device includes a light source divided into a plurality of blocks. The power manager 14c includes a first lighting of the light source of each block, and a second lower luminance than the first lighting. Is turned on and off individually, and the first to third areas A1 to A3 of the LCD 70 corresponding to each block are turned on for the first time, the second lighting, or turned off. It is possible to achieve both the reduction in the user-friendliness and the convenience for the user.

  Further, when the mouse cursor C1 moves from the first lighting area of the LCD 70 to the extinguishing area, the power manager 14c sets the extinguishing area to the second lighting, so that the window used by the user Other information displayed on the screen other than can be easily confirmed, and the convenience of the user can be improved.

  In addition, when the mouse cursor C1 moves from the second lighting area of the LCD 70 to the first lighting area, the power manager 14c turns off the second lighting area, thereby reducing power consumption. It becomes possible.

  Further, since the power manager 14c changes the size of the active window on the LCD 70 to the size of the area to be lit, the area other than the active window is turned on or off for the second time. This makes it possible to achieve both user operability and reduced power consumption.

  Further, since the power manager 14c changes the size of the first lighting area of the LCD 70 based on the remaining battery level when the battery is driven, the power manager 14c can reduce power consumption without impairing the convenience for the user. Can do.

  In addition, the backlight device includes a line-type LED module that emits light and a reflector that reflects the light emitted from the line-type LED module. Therefore, the backlight device is configured with a low-cost and compact configuration. It becomes possible.

  In the above embodiment, an LCD (liquid crystal display panel) is used as the display panel. However, the present invention is not limited to this, and another backlight type display panel is used. Also good. In the above embodiment, the line-type LED module is used as the backlight device. However, the present invention is not limited to this, and the backlight device is divided into a plurality of books and independently lit for each block. Any other light source such as an EL element may be used, or full-screen illumination may be used. In the above embodiment, the case where the line type LED module is divided into three parts has been described. However, the present invention is not limited to this, and it is divided into two parts or four parts or more according to the screen size of the LCD 70. It may be. In the above embodiment, the mouse cursor is exemplified as the position instruction means for giving a position instruction on the screen. However, the present invention is not limited to this, and the keyboard cursor, slice pad cursor, etc. The present invention can be applied to other cursors.

  The display device and its power control program according to the present invention can be applied to various backlight-driven display devices.

1 is a diagram showing an example of a schematic hardware configuration when a display device according to the present invention is applied to a battery-driven notebook personal computer. It is a schematic diagram for demonstrating the structure of a display unit. It is explanatory drawing for demonstrating a 1st power saving process. It is a flowchart for demonstrating the 1st power saving process which a power manager performs. It is a flowchart for demonstrating the 1st power saving process which a power manager performs. It is explanatory drawing for demonstrating a 2nd power saving process. It is explanatory drawing for demonstrating a 2nd power saving process. It is a flowchart for demonstrating the 2nd power saving process which a power manager performs. It is a flowchart for demonstrating the 2nd power saving process which a power manager performs.

Explanation of symbols

11 CPU
12 ROM
13 RAM
14 HDD (hard disk)
DESCRIPTION OF SYMBOLS 15 Optical disk apparatus 16 Display unit 17 Network card 18 Input part 19 USB port 20 Battery 21 Power controller 22 DC-DC converter 23 AC adapter
30 backlight controller 40a-40c 1st-3rd LEDC (1st-3rd LED controller)
50a-50c 1st-3rd LEDB (1st-3rd LED block)
60 LCD controller 70 LCD (liquid crystal display panel)

Claims (7)

A display panel for displaying information on the screen;
Illuminating means for illuminating the display panel by irradiating light from the back side of the display panel;
Control means for controlling lighting of the illumination means;
With
The illumination means includes a light source divided into a plurality of blocks,
The control means individually controls the first lighting of the light source of each block, the second lighting having a lower brightness than the first lighting, and the turning off, and thereby each area of the display panel corresponding to each block is controlled. A display device characterized in that the first lighting, the second lighting, or the lighting is turned off.   When the position indicating means for giving a position instruction on the screen moves from the first lighting area to the extinguished area of the display panel, the control means performs the illumination so that the extinguished area becomes the second lighting. The display device according to claim 1, wherein the means is controlled.   The control means turns off the second lighting area when the position instruction means for giving a position instruction on the screen moves from the second lighting area of the display panel to the first lighting area. The display device according to claim 1, wherein the illumination unit is controlled as described above.   The said control means changes the size of the active window on the said screen into the size of the area | region to light, and turns off area | regions other than an active window to 2nd lighting or extinction second. The display device according to any one of the above. A battery remaining amount detecting means for detecting the remaining amount of the battery is provided.
5. The size of the first lighting area of the display panel is changed based on the remaining amount of the battery when the battery is driven. 6. Display device.   The said illumination means is comprised with the line type LED module which emits light, and the reflecting plate which reflects the light emitted from the said line type LED module, The any one of Claims 1-5 characterized by the above-mentioned. The display device described in one. A display panel for displaying information on a screen; and a light source that has a light source divided into a plurality of blocks, and illuminates the display panel by irradiating light from the back side of the display panel. In the power control program installed in the display device,
Each area of the display panel corresponding to each block is controlled by individually controlling the first lighting of the light source of each block of the illuminating means, the second lighting having a lower luminance than the first lighting, and the turning off. A power control program that causes a computer to execute a step of turning on, turning on, or turning off.

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