JP2014216963A - Display device, control method of display device, and control program of display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect surrounding light in high sensitivity with a simple configuration and enhance users' satisfaction.SOLUTION: The display device includes: a clock section (13) that obtains current time; a surrounding environment determination part (22) that determines a color temperature of a screen displayed by a display section (15) by determining an outdoor light state surrounding the device itself and using the determined outdoor light state and current time; and a display control section (24) that displays with the determined color temperature.

Description

  The present invention relates to a display device that detects ambient light and adjusts the color temperature of a display screen.

  In recent years, display devices having a function of automatically adjusting the brightness and color temperature of a display screen in accordance with the brightness of ambient light (ambient light) are known. For example, Patent Literature 1 discloses a technique in which a display device includes an RGB sensor, ambient light is measured by the RGB sensor, and display on the display screen is adjusted based on the measurement result.

JP 2003-37852 A (published February 7, 2003)

  However, since the above-described prior art uses RGB sensors, the arithmetic processing becomes complicated and the configuration of the apparatus becomes complicated. In addition, in order to increase sensitivity, the window region corresponding to the sensor portion of the RGB sensor must be transparent, which limits the design of the apparatus. Furthermore, since the RGB sensor is expensive, the cost increases.

  In addition, since adjustment is performed using only ambient light, the display cannot always satisfy the user.

  The present invention has been made in view of the above problems, and an object of the present invention is to realize a display device and the like capable of detecting ambient light with a simple configuration and high sensitivity and capable of increasing the user's satisfaction. is there.

  In order to solve the above-described problem, a display device according to one embodiment of the present invention is a display device that controls the color temperature of a display portion in accordance with external light, and determines an external light state around the device. Using the external light state determination means, the current time acquisition means for acquiring the current time, the external light state determined by the external light state determination means, and the current time acquired by the current time acquisition means, the display unit Color temperature determining means for determining the color temperature of the screen to be displayed, and display control means for displaying the display section at the color temperature determined by the color temperature determining means.

  The display device control method according to one embodiment of the present invention is a display device control method for controlling the color temperature of the display portion in accordance with external light, and includes an external light state determination method for determining the ambient light state around the device. The display unit uses the light state determination step, the current time acquisition step for acquiring the current time, the external light state determined in the external light state determination step, and the current time acquired in the current time acquisition step. A color temperature determining step for determining a color temperature of a screen to be displayed; and a display control step for displaying the display unit at the color temperature determined in the color temperature determining step.

  According to one aspect of the present invention, since the color temperature of the screen displayed on the display unit is determined using the determined external light state and the acquired current time, it is compared with the case where only the external light state is used. Thus, there is an effect that the color temperature can be set so that the display is more satisfied by the user. In addition, since only two of the external light state and the current time are used, there is an effect that the configuration can be simplified.

It is a block diagram which shows the principal part structure of the display apparatus which concerns on embodiment of this invention. It is a figure which shows the external appearance of the said display apparatus. It is a figure which shows the relationship between an illuminance value and IR ratio, and the environmental state of ambient light. It is a figure for demonstrating the classification | category of the environmental state of ambient light. It is a figure which shows the relationship between an environmental state and an image processing parameter (color temperature value). It is a flowchart which shows the flow of the process in the said display apparatus.

Embodiment 1
〔Overview〕
Hereinafter, embodiments of the present invention will be described in detail. Note that the display device according to the present invention is applicable to display devices such as smartphones, PDAs (Personal digital assistance), notebook PCs (Personal Computers), and televisions.

  In FIG. 2, the external appearance of the display apparatus 1 which concerns on this embodiment is shown. Here, the case where it applies to a smart phone as the display apparatus 1 is shown. As shown in FIG. 2, the display device 1 includes a display unit 15 and an illuminance sensor 11, and uses the illuminance information detected by the illuminance sensor 11 to determine the ambient state of ambient light (hereinafter also referred to as ambient environment). The color temperature of the display on the display unit is controlled according to the determined environmental state and the current time. As a result, display can be performed at a color temperature corresponding to the environmental state and the current time, and a more natural display can be provided to the user.

[Device configuration]
The configuration of the main part of the display device 1 will be described with reference to FIG. FIG. 1 is a block diagram showing a main configuration of the display device 1. As shown in FIG. 1, the display device 1 includes a control unit 10, an illuminance sensor 11, a GPS (Global Positioning System: position information acquisition unit) 12, a clock unit (current time acquisition unit) 13, a timer 14, and a display unit 15. It is the structure containing.

  The illuminance sensor 11 detects ambient brightness. Then, a signal corresponding to the amount of incident light is output to the illuminance value / IR ratio calculation unit 21 as illuminance information.

  The GPS 12 uses a radio wave from a satellite to specify a position (location) where the device is present. The specified position (location) is output as position information to the surrounding environment determination unit 22.

  The clock unit 13 outputs the current time to the surrounding environment determination unit 22.

  When the timer 14 executes some processing in the display device 1, the timer 14 outputs the execution timing to the control unit 10.

  The display unit 15 displays an image on the display screen based on the display information received from the control unit 10. The display unit 15 includes a display element such as an LCD (Liquid Crystal Display) or an EL (Electroluminescence) display, and a driver circuit that drives the display element based on received display information.

  The control unit 10 comprehensively controls various components in the display device 1 and includes a processor such as a CPU (Central Processing Unit). Although not shown in the drawing, it includes storage elements such as a random access memory (RAM), a read only memory (ROM), and a flash memory that store various data and programs.

  The control unit 10 includes an illuminance value / IR ratio calculation unit (infrared light amount ratio calculation unit) 21, an ambient environment determination unit (external light state determination unit, color temperature determination unit) 22, an image processing unit 23, and a display control unit ( Display control means) 24.

  The illuminance value / IR ratio calculation unit 21 uses the illuminance information acquired from the illuminance sensor 11 to calculate the illuminance value and the IR ratio. The calculated illuminance value and IR ratio are notified to the surrounding environment determination unit 22.

  Here, the illuminance value refers to a difference between the total light amount detected by the illuminance sensor 11 and the infrared light amount obtained by removing the visible light amount from the total light amount. The IR ratio means a value obtained by dividing the total light amount by the infrared light amount (total light amount / infrared light amount (total light amount-visible light amount)).

  The ambient environment determination unit 22 uses the position information acquired from the GPS 12, the current time acquired from the clock unit 13, the illuminance value acquired from the illuminance value / IR ratio calculation unit 21, and the IR ratio (ambient environment) Outside light state). Then, the image processing parameter (color temperature value) corresponding to the determined environmental state is notified to the image processing unit 23. The details of the environmental condition determination process for ambient light will be described later.

  The image processing unit 23 processes the display data acquired using the image processing parameters acquired from the ambient environment determination unit 22. More specifically, the display data is processed so as to be displayed with the color temperature value indicated by the image processing parameter. Then, processed display data that is display data after processing is sent to the display control unit 24.

  Color temperature is a numerical value that represents the relative intensity of bluish purple light and red light contained in a light source that emits a certain color. The black body emits light of the same color as that light. Temperature. The unit is K (Kelvin).

  The display control unit 24 causes the display unit 15 to display the processed display data acquired from the image processing unit 23. Further, the display control unit 24, after returning from the state in which the display saving function is executed, changes the speed of changing the display on the display unit 15 to the color temperature determined by the ambient environment determination unit 22 within a predetermined time. Slower than outside. The display saving function is a function for turning off the display of the display unit 15 when an operation on the own apparatus is not accepted for a predetermined time.

[Details of ambient environment determination unit 22]
Next, details of processing in the surrounding environment determination unit 22 will be described with reference to FIGS. 3 is a diagram showing the relationship between the illuminance value and the IR ratio and the environmental state of ambient light, FIG. 4 is a diagram for explaining the classification of the environmental state of ambient light, and FIG. It is a figure which shows the relationship between an environmental state and an image processing parameter (color temperature value).

  As a result of the experiment, the inventors of the present application have found that the relationship between the ambient light, the illuminance value, and the IR ratio has a distribution as shown in FIG. The diagram shown in FIG. 3 shows the distribution of ambient light when the ordinate indicates the illuminance value and the abscissa indicates the IR ratio. Here, outdoor (shade / hinata), outdoor (under the roof), living room (window side (blind open)), living room (window side (blind closed)), corridor (fluorescent light + outside light (close to outside light)), corridor ( Fluorescent lamp + outside light (close to fluorescent lamp)) Living room (fluorescent lamp ordinary lamp), dark room (halogen), dark room (three-wavelength daylight color), dark room (bulb-type fluorescent lamp (daylight color)), dark room (LED (daylight color)) 810 lumen), dark room (LED (bulb color) 640 lumen), and dark room (bulb (silica)) in each of the illuminance value (vertical axis) and IR ratio (horizontal axis) distribution.

  As shown in FIG. 3, when the illuminance value is taken on the vertical axis and the IR ratio is taken on the horizontal axis, the area where the daylight color is concentrated (area A), the area where the LED bulb color is concentrated (area B), the daytime Area (area C) where white light (fluorescent lamp ordinary light) is concentrated, area (area D) where outdoor light is concentrated, area (area E) where external light is concentrated under the roof, Area (area F) where outdoor light + fluorescent lamps are concentrated indoors (in the living room and hallway), area (area G) where halogen is concentrated, and area (area H) where light bulbs (silica) are concentrated ).

  The inventors of the present application divided this distribution into five regions and set the color temperature corresponding to each region. Specifically, the area where the IR ratio is about 0.6 to about 0.75 and the illuminance value is about 145 to about 250 is an outdoor area, the IR ratio is 0 to about 0.35, and the illuminance value is about 40 to about 250. The area A is the environment A area, the IR ratio is about 0.35 to about 0.75, and the illuminance value is about 40 to about 250. The area not included in the outdoor area is the environment B area, and the IR ratio is about 0. An area having an illuminance value of about .75 to 1.0 and an illuminance value of about 40 to about 250 was an environment C area, and an area having an IR ratio of 0 to 1.0 and an illuminance value of 0 to about 40 was an environment D area.

  In this way, by dividing the distribution map in which the ordinate indicates the illuminance value and the abscissa indicates the IR ratio into a plurality of regions, if the illuminance value and the IR ratio are known, the environmental state of ambient light in the place is estimated. It becomes possible.

  Then, the ambient environment determination unit 22 uses the table associating the ambient light ambient condition (ambient environment) with the image processing parameter (color temperature value) as shown in FIG. Determine image processing parameters. In the present embodiment, the image processing parameter is determined using the current time and location information in addition to the illuminance value and the IR ratio.

  Specifically, when the surrounding environment is an outdoor region and not around the home, the image processing parameter is set to 6500K. In the case of an outdoor area, a configuration for controlling the contrast may be used.

  Also, if the surrounding environment is the environment A area and not around the house, it is 5000K from midnight to 6 o'clock, 8000K from 6 o'clock to 9 o'clock, 6500K from 9 o'clock to 20 o'clock, from 9 o'clock It will be 5000K until midnight.

  As described above, the environment A region is a region in which ambient ambient light is concentrated. And since the color temperature of daylight color is 5884K-6498K, by setting the color temperature to 5000-8000K, the color temperature of display on the display unit can be close to the color temperature of ambient light, and the user feels strange. It is possible to provide a display without any problem. In addition, the stimulation given to the user is reduced by lowering the color temperature of the time corresponding to the sleep time zone, and the user is refreshed by raising the color temperature of the time corresponding to the activity start time zone. Is possible.

  Also, if the surrounding environment is the environment B area and not around the home, it is 5300K from midnight to about 6:00, 6500K from 6:00 to 9:00, 5500K from 9:00 to 20:00, and from 9:00 It will be 3000K until midnight.

  As described above, the environment B area is an area where ambient ambient light is concentrated. And since the color temperature of daylight is about 4000K, setting the color temperature to 3000-6500K can make the display color temperature close to that of ambient light, It is possible to provide a display without a sense of incongruity. In addition, the stimulation given to the user is reduced by lowering the color temperature of the time corresponding to the sleep time zone, and the user is refreshed by raising the color temperature of the time corresponding to the activity start time zone. Is possible. That is, the color temperature can be set according to the human life cycle.

  Hereinafter, the same applies to the environment C region and the environment D region. In addition, by setting the color temperature lower in the vicinity of the home, it is possible to give a calm feeling to the user when the user comes around the home. Note that a configuration in which the color temperature is set lower around the home is not essential.

  The environment D region is a region having a low illuminance value, that is, a region where ambient ambient light is dark. In such a region, if the display is too bright, the eye irritation becomes strong. Therefore, the backlight is lowered. In addition, the image processing parameters are set corresponding to the time zone in the same manner as in the environment A area, the environment B area, and the environment C area.

  In addition, as shown in FIG. 5, a mode in which image processing parameters are set in accordance with the surrounding environment according to the image quality mode (fully automatic), a mode in which the color temperature is always 6500K (image quality mode 1), and a color temperature that is always 9300K. Mode (image quality mode 2), or a mode in which the color temperature is always 8000K (image quality mode 3).

[Process flow]
Next, the flow of processing in the display device 1 will be described with reference to FIG. FIG. 6 is a flowchart showing the flow of processing in the display device 1.

  As shown in FIG. 6, when the process start timing of the color temperature setting process comes (YES in S1), the illuminance value / IR ratio calculation unit 21 acquires illuminance information from the illuminance sensor 11 (S2). Then, the illuminance value / IR ratio calculation unit 21 calculates the illuminance value and the IR ratio using the acquired illuminance information (S3).

  Next, the ambient environment determination unit 22 determines the ambient state of ambient ambient light using the illumination value and IR ratio calculated by the illumination value / IR ratio calculation unit 21 (S4, ambient light state determination step). Then, the ambient environment determination unit 22 determines an image processing parameter (color temperature value) using the determined environment state, current time (current time acquisition step), and location information (S5, color temperature determination step). Thereafter, the image processing unit 23 processes the display data acquired using the image processing parameters determined by the ambient environment determination unit 22 (S6), and the display control unit 24 has processed the processed data processed by the image processing unit 23. The display data is displayed on the display unit 15 (S7, display control step). The above is the flow of processing in the display device 1.

[Additional Notes]
In the embodiment described above, the IR ratio used to determine the environmental state of ambient light is obtained by dividing the total light amount by the infrared light amount (total light amount / infrared light amount (total light amount-visible light amount)). However, the IR ratio is not limited to this, and any IR ratio may be used as long as the ratio of the infrared light quantity to the total light quantity can be recognized. For example, the ratio of the visible light quantity to the total light quantity may be used.

  In the embodiment described above, the color temperature is adjusted with the time zone fixed. However, the present invention is not limited to this, and the time zone for adjusting the color temperature is set in accordance with the activity time of each user. May be.

[Embodiment 2]
In the above-described embodiment, the illuminance value and the IR ratio are calculated using the illuminance information acquired from the illuminance sensor 11. In the present embodiment, two illuminance sensors 11 are provided, and the output from one illuminance sensor 11 is obtained by removing the visible light amount from the total light amount. Thereby, since the illuminance value / IR ratio calculation unit 21 can acquire the total light amount and the infrared light amount (one obtained by removing the visible light amount from the total light amount), in the illuminance value / IR ratio calculation unit 21, There is no need to calculate the amount of light.

  The illuminance value is a difference between the total light amount and the infrared light amount, but is not a simple difference and may be obtained by multiplying each light amount by a coefficient to obtain the difference. That is, when the coefficients are α and β, the illuminance value = α × total light amount−β × infrared light amount may be obtained.

[Embodiment 3]
The control blocks of the display device 1 (particularly the control unit 10 (illuminance value / IR ratio calculation unit 21, ambient environment determination unit 22, image processing unit 23, display control unit 24)) are formed in an integrated circuit (IC chip) or the like. Alternatively, it may be realized by a logic circuit (hardware) or by software using a CPU (Central Processing Unit).

  In the latter case, the display device 1 includes a CPU that executes instructions of a program that is software that implements each function, a ROM (Read Only Memory) in which the program and various data are recorded so as to be readable by a computer (or CPU), or A storage device (these are referred to as “recording media”), a RAM (Random Access Memory) that expands the program, and the like are provided. And the objective of this invention is achieved when a computer (or CPU) reads the said program from the said recording medium and runs it. As the recording medium, a “non-temporary tangible medium” such as a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used. The program may be supplied to the computer via an arbitrary transmission medium (such as a communication network or a broadcast wave) that can transmit the program. The present invention can also be realized in the form of a data signal embedded in a carrier wave in which the program is embodied by electronic transmission.

[Summary]
The display device according to the first aspect of the present invention is a display device that controls the color temperature of the display unit according to external light, and is an external light state determination unit (ambient environment determination) that determines an external light state around the device itself. Unit 22), a current time acquisition unit (clock unit 13) for acquiring a current time, an external light state determined by the external light state determination unit, and a current time acquired by the current time acquisition unit, Color temperature determination means (ambient environment determination unit 22) for determining the color temperature of the screen displayed on the display unit, and display control means (display control) for displaying the display unit at the color temperature determined by the color temperature determination unit Part 24).

  The display device control method according to aspect 5 of the present invention is a display device control method for controlling the color temperature of the display unit in accordance with external light, and is an external device that determines the ambient light state around the device itself. The display unit uses the light state determination step, the current time acquisition step for acquiring the current time, the external light state determined in the external light state determination step, and the current time acquired in the current time acquisition step. A color temperature determining step for determining a color temperature of a screen to be displayed, and a display control step for displaying the display unit at the color temperature determined in the color temperature determining step.

  According to the above configuration or method, the color temperature of the screen displayed on the display unit is determined using the external light state determined by the external light state determination unit and the current time acquired by the current time acquisition unit. Therefore, compared to the case where only the outside light state is used, the color temperature can be set to a display that satisfies the user.

  Further, since only two of the external light state and the current time are used, the configuration can be simplified.

  The display device according to aspect 2 of the present invention is the red light that calculates the ratio between the illuminance sensor, the total light amount detected by the illuminance sensor, and the infrared light amount obtained by removing the visible light amount from the total light amount. External light ratio calculation means (illuminance value / IR ratio calculation unit 21), and the external light state determination means calculates the ratio between the total light quantity calculated by the infrared light quantity ratio calculation means and the infrared light quantity. It is used to determine the external light state.

  According to said structure, since an external light state is determined using the ratio of an infrared light quantity and a total light quantity, an external light state can be determined correctly and easily.

  In addition, since the ambient light state can be determined using the illuminance sensor, the configuration can be simplified compared to the case where the RGB sensor is used.

  The display device according to aspect 3 of the present invention includes, in the above aspect 1 or 2, a position information acquisition unit that acquires information related to the position of the own device, and the color temperature determination unit is configured to detect the external light state and the current time. In addition, the color temperature is determined using the location of the apparatus acquired by the position information acquisition means.

  According to the above configuration, since the color temperature is determined using the information regarding the position, the color temperature can be set in consideration of the position of the own apparatus.

  The display device according to aspect 4 of the present invention has a display save function in any one of the above aspects 1 to 3, which turns off the display on the display unit when no operation is received for the device for a predetermined time. The display control means, after returning from the state in which the display save function is executed, within a predetermined time, the display control means changes the display speed of the display unit to the color temperature determined by the color temperature determination means. This is slower than when it is outside the predetermined time.

  According to said structure, the speed which changes the color temperature of a display part will become slow within the predetermined time from the state in which the display save function is performed. As a result, it is possible to prevent the color temperature of the display unit from changing abruptly immediately after returning from the state in which the display saving function is being executed, which gives the user an uncomfortable appearance. That can be reduced.

  The display device according to each aspect of the present invention may be realized by a computer. In this case, the display device is realized by the computer by causing the computer to operate as each unit included in the display device. A control program and a computer-readable recording medium on which the control program is recorded also fall within the scope of the present invention.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention. Furthermore, a new technical feature can be formed by combining the technical means disclosed in each embodiment.

  The present invention can be used for an apparatus including a display unit.

1 Display Device 10 Control Unit 11 Illuminance Sensor 12 GPS (Position Information Acquisition Unit)
13 Clock part (current time acquisition means)
14 Timer 15 Display Unit 21 Illuminance Value / IR Ratio Calculation Unit (Infrared Light Ratio Calculation Unit)
22 Ambient environment determination unit (external light state determination means, color temperature determination means)
23 Image Processing Unit 24 Display Control Unit (Display Control Unit)

Claims (6)

A display device that controls the color temperature of a display unit according to external light,
An external light state determination means for determining an external light state around the device,
Current time acquisition means for acquiring the current time;
A color temperature determination unit that determines a color temperature of a screen displayed on the display unit using the external light state determined by the external light state determination unit and the current time acquired by the current time acquisition unit;
Display control means for displaying the display unit at the color temperature determined by the color temperature determination means;
A display device comprising: An illuminance sensor;
Infrared light quantity ratio calculating means for calculating a ratio between the total light quantity detected by the illuminance sensor and the infrared light quantity obtained by removing visible light quantity from the total light quantity,
The said external light state determination means determines the said external light state using the ratio of the said total light quantity and the said infrared light quantity which the said infrared light quantity ratio calculation means calculated. Display device. A position information acquisition means for acquiring information related to the position of the own device;
The color temperature determination means determines the color temperature using the location of the own apparatus acquired by the position information acquisition means in addition to the outside light state and the current time. The display device described. It has a display save function that turns off the display of the display unit when an operation for the device is not accepted for a predetermined time,
The display control means sets the speed at which the display on the display unit is changed to the color temperature determined by the color temperature determination means within the predetermined time after returning from the state in which the display save function is executed. The display device according to any one of claims 1 to 3, wherein the display device is slow compared to the outside.   A display device control program for causing a computer to function as the display device according to any one of claims 1 to 4, wherein the display device control program causes the computer to function as each of the means. A control method for a display device that controls the color temperature of a display unit according to external light,
An external light state determination step for determining an external light state around the device;
A current time acquisition step for acquiring the current time;
A color temperature determination step for determining a color temperature of a screen to be displayed on the display unit using the external light state determined in the external light state determination step and the current time acquired in the current time acquisition step;
A display control step for displaying the display unit at the color temperature determined in the color temperature determination step;
A control method for a display device, comprising:

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