KR20100045871A - Method and apparatus for displaying screen size and brightness of projector in wireless terminal - Google Patents

Abstract

PURPOSE: A method and a device for displaying screen size and brightness of projector in a wireless terminal are provided to automatically control a screen size of a projector and the brightness of a screen according to a distance of a screen and illumination of surrounding. CONSTITUTION: A controller measures a distance value from a projector to a screen by a distance sensor(S307). The controller calculates a screen size through the distance value(S309). The controller drives a projector driver for displaying the screen to the screen size(S311). The controller measures an illumination value through an illumination sensor(S313). The controller selects a screen brightness control value by inputting the distance value and the illumination value about a control value table(S315).

Description

METHOD AND APPARATUS FOR DISPLAYING SCREEN SIZE AND BRIGHTNESS OF PROJECTOR IN WIRELESS TERMINAL}

The present invention relates to a method and apparatus for controlling the screen size and brightness of a projector provided in a mobile terminal, and more particularly, to automatically adjust the screen size and the screen brightness of a projector of a mobile terminal according to distance and illuminance to reduce unnecessary power consumption. The present invention relates to a method and apparatus for controlling the projector screen size and brightness of a portable terminal, which can reduce battery life.

A portable terminal refers to a terminal that can be wirelessly carried by an individual, such as a mobile communication terminal, a personal mobile communication terminal, a personal digital assistant (PDA), and the like. Today's portable terminals provide a variety of application functions by combining with other information devices. For example, the communication function provides a function of transmitting and receiving various messages together with the existing voice communication. In addition, a video recording function using an internal / external camera module, an MP3 player function, and a TV reception function are provided. Could provide.

In addition, a project function may be given to enlarge the view of the liquid crystal display of a narrow field of view of the mobile terminal display unit.

In the portable terminal provided with the projector, the screen brightness of the projector shows a constant brightness regardless of the illuminance environment or the viewing distance.

In the case of a projector portable terminal, unlike the existing terminal, the image of the LCD screen may be projected to the outside through a projector to view the screen, so the ambient illumination environment becomes a very sensitive factor for adjusting the screen brightness. In addition, since the user does not always watch at the same distance, the distance displayed is also an important factor. If the brightness of the screen is kept constant without limiting the surrounding environment and distance, there is a problem in that unnecessary power consumption is caused in a low illuminance environment or close distance, thereby reducing the battery usage time. In addition, since the size of the screen changes according to the distance, there is a disadvantage in that the size of the screen cannot be known from a user's point of view.

Accordingly, an object of the present invention is to provide a method and an apparatus capable of extending battery life by reducing unnecessary power consumption by simultaneously controlling screen size and screen brightness according to distance and illuminance.

Another object of the present invention is to provide a method for frequently knowing the size of the screen from the user's point of view according to the screen distance.

In accordance with another aspect of the present invention, a method for adjusting a projector screen brightness of a portable terminal includes: a predetermined screen determined by a distance value measured by a distance from a screen to be projected by the distance sensor; A screen brightness adjustment step of displaying a size, a screen brightness selection step of selecting a screen brightness control value using a distance value and an ambient light value measured by the ambient light sensor in the screen size adjustment step, and the screen brightness selection step And adjusting the brightness of the screen by using the selected screen brightness control value.

In another aspect of the present invention, there is provided a portable terminal including a projector, wherein the projector screen brightness adjusting device of the portable terminal includes a memory unit configured to store a control value table for controlling screen brightness according to distance and illuminance. A sensor configured to measure a distance from the screen to be projected and a peripheral illumination, a controller configured to automatically control a screen size and screen brightness according to a control value table of the memory unit and a screen distance and peripheral illumination by the detector; And a projector unit displaying the screen size according to the instruction of the controller and projecting the screen at a corresponding brightness.

The controller calculates a screen size to be projected using the measured distance value and converts the screen size into a corresponding screen size, and the screen from the control value table stored in the memory unit using the measured distance value and illuminance value. It characterized in that it comprises a screen brightness control unit for adjusting the brightness.

According to the present invention, the screen size and the brightness of the projector can be simultaneously controlled according to the screen distance and the ambient illumination, thereby reducing unnecessary power consumption and extending the battery usage time.

In addition, even if the size of the screen changes according to the screen distance, there is an advantage in that the user can often know the size of the screen.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this case, the same components in the accompanying drawings should be noted that the same reference numerals as possible. And a detailed description of known functions and configurations that can blur the gist of the present invention will be omitted.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 is a diagram illustrating an internal configuration of a portable terminal having a projector according to an exemplary embodiment of the present invention.

Referring to FIG. 1, the controller 110 controls a general operation related to screen brightness and screen size of the projector 151 of the portable terminal. The controller 110 includes a screen brightness controller 111 and a screen size converter 113. The screen brightness control unit 111 has a distance value and illuminance value measured by the distance sensor 141 and the illuminance sensor 143, respectively, in the screen brightness control value table stored in the memory unit 130, and the corresponding screen brightness control value. Select to adjust the screen brightness. The screen size converting unit 113 calculates the projected screen size using the distance value and converts the screen size into the corresponding size. The controller 110 may automatically control the screen size and the screen brightness according to the peripheral illumination and the screen distance of the screen image of the display unit 160. However, in the present invention, the screen brightness controller 111 and the screen size converter 113 are implemented by FIG. 3.

The input unit 120 provides a plurality of keys for operating the projector 151, and a selection signal according to a user's key selection is input to the controller 110. The input unit 120 includes a project mode key 121 that commands to project an image input to the projector 151. The input unit 120 may be a keypad, a pointing device such as a touch pad, or an input device such as a touch screen.

The memory unit 130 may include program memory and data memories. The program memory includes programs for controlling a general operation of the portable terminal. In particular, the memory unit 130 stores a program for controlling the brightness of the screen projected from the projector 151 for carrying out the present invention, and a screen brightness control value table for each distance / illuminance.

The projector unit 150 includes a projector driver 153 and a projector 151. The projector driver 153 adjusts the projector 151 to project the screen at the corresponding brightness according to the brightness control signal of the controller 110. The projector 151 projects the screen at the corresponding brightness according to the instruction of the projector driver 153 and displays the screen size. The projector driver 153 may be included in the controller 110.

The sensing unit 140 includes a distance sensor 141 and an illuminance sensor 143. The distance value is the distance measured by the distance sensor 141, and the illuminance value refers to the illuminance measured by the illuminance sensor 143. The distance sensor 141 inputs a distance value measuring the distance of the screen to be projected to the controller 110. The illuminance sensor 143 inputs an illuminance value of measuring peripheral illuminance to the controller 110.

The display unit 160 displays the screen image to be projected by the projector 151 under the control of the controller 110, and displays a series of operation states, operation results, and a plurality of pieces of information made in the internal block of the portable terminal. In this case, the display unit 160 may be configured as a display device such as a liquid crystal display (LCD), organic light emitting diodes (OLED), a plasma display panel (PDP), or the like. In this case, when the LCD is implemented using a touch screen method, the LCD may operate as the input unit 120.

A method of calculating the size of the projected screen will be described with reference to FIGS. 2A and 2B.

2A is a side view of a projector for projecting a screen according to an embodiment of the present invention, and FIG. 2B is a plan view of a projector for projecting a screen according to an embodiment of the present invention.

FIG. 1 and FIG. 2a and FIG. 2b, r _X is Is the measured distance value from the projector 151 to the screen 210, θ is the angle of view of the screen projected by the projector 151, d and c are the horizontal and vertical lengths of the projected screen 220, respectively When the ratio is a screen size ratio and a unit is inches, the screen size W may be calculated by Equation 1 below.

화면 크기(W) = 0.8 × ｒ_X × tanθ × (inch)

Screen size (W) = 0.8 × ｒ _X × tanθ × (inch)

The screen size (W) is represented by the diagonal length (ℓ) of the screen 220, the size of the screen 220 is the measured distance value (R _X ) and the angle of view (θ) and the ratio of the horizontal length ( It can be seen that it is proportional to d).

In FIG. 1, in order to automatically control screen brightness, the memory unit 130 previously stores control values calculated by a plurality of experimental values in a screen brightness control value table for each distance / illuminance.

For example, the implementation of the screen brightness control value table for each distance / illuminance which calculates a control value based on a plurality of experimental values may be performed in the following manner.

`` Table 1 ''

Table 1 shows a table of brightness control values by distance / illuminance.

A _i (Lux) in Table 1 (i = 1, 2, 3, 4, 5, ... n, n = integer) is an illuminance value variable interval, r _j (M) (i = 1, 2, 3) , 4, 5, …… n, n = integer) are distance value variable intervals.

S _{ai and rj} are a plurality of control values for controlling screen brightness and are experimentally measured by the variables of a _i and r _j . Of course, the r _j and a _i must be within the range of the distance value and illuminance value measured by the distance sensor 141 and the illuminance sensor 143.

In more detail, first, the illuminance value variable a _i will be examined in relation to the distance value variable r _j . The automatic control of screen brightness should increase as the illuminance value increases, and at the same time as the distance value increases. That is, as the distance value and illuminance value increase, the values satisfying the increase in the control value at the same time correspond to the diagonals in the table (S _{a1, r1,} S _{a2, r2,} S _{a3, r3,} S _{a4, r4,} ……).

On the other hand, the actual situation is not as described above and the distance (distance value) is far, but the illuminance (illuminance value) may be low, on the contrary, although the illuminance is high, the distance may be short. That is, the values for the distance and illuminance to satisfy the above situation are values other than the diagonal (S _{a2, r1,} S _{a3, r1,} S _{a4, r1,} S _{a3, r2,} S _{a4, r2,} S _{a1, r3,} S _{a2, r3,} S _{a1, r4,} S _{a2, r4,} S _{a3, r4,} ...

Specifically, the table is as follows.

`` Table 2 ''

Table 2 shows an example of screen brightness control values for each distance / illuminance.

Looking at Table 2 as follows.

First, the variables a _i and r _j of Table 2 may be configured by subdividing a range for each section. The illuminance value variable a _i is a _1, a _2, a _3, a _4, a ₅ ,. … In this case, 0 to 5 Lux or less, 5 to 10 Lux or less, 10 to 15 Lux, 15 to 20 Lux, 20 to 25 Lux,. … And the distance value variable r _{j is} also from top to bottom, r _1, r _2, r _3, r _4, r ₅ ,. … In this regard, 0 to 0.5M or less, 0.5 to 1M or less, 1 to 1.5M, 1.5 to 2M, 2 to 2.5M,... … And the like. Of course, the a _i and r _j may be set by further subdividing the range.

Control values (S _{ai, rj} ) corresponding to the above values can be made. That is, based on the distance of 0 to 0.5M (r ₁ ), 0 to 5 Lux (a ₁ ), 5 to 10 Lux (a ₂ ), 10 to 15 Lux (a ₃ ), 15 to 20 Lux (a ₄ ),. … Control values 30 (S _{a1, r1} ), 40 (S _{a2, r1} ), 50 (S _{a3, r1} ),... _, Corresponding to various illuminance values, and the like may be made. If the distance is 0.5 to 1 M (r ₂ ), 0 to 5 Lux (a ₁ ), 5 to 10 Lux (a ₂ ), 10 to 15 Lux (a ₃ ), 15 to 20 Lux (a ₄ ),. … Control values 130 (S _{a1, r2} ), 140 (S _{a2, r2} ), 150 (S _{a3, r2} ),... _, Corresponding to various illuminance values, may be made. The control values 30, 40, 50, 130, 140, 150, etc. are preferably set to values obtained by experimental values.

In the above example, a _i and r _j have a range for each section, but the present invention is not limited thereto, and the range for each section may be replaced with a single value. That is, a _i is 0 to 5 Lux, 5 to 10 Lux, 10 to 15 Lux, 15 to 20 Lux, 20 to 25 Lux,... … Instead of 0Lux, 1Lux, 2Lux, 3Lux, 4Lux, 5Lux,… … It can also be set as an alternative. The above r _{j is} also 0 to 0.5M, 0.5 to 1M, 1 to 1.5M, 1.5 to 2M, 2 to 2.5M,... … Instead 0.5M, 1M, 1.5M, 2M, 2.5M,... … It can also be set as an alternative. It is also possible to further refine the single value.

An example of applying the measured distance value and illuminance value to Table 1 is as follows.

First, referring to Tables 1 and 2, if the distance value measured by the distance sensor 141 of the sensing unit 140 is 1.3M, and the illuminance value measured by the illuminance sensor 143 is 3Lux, the distance value variable section (r _j ) The control value to which the screen brightness is applied as 230 _{, which} is the value (S _{a1, r3} ) where the value of the 1 to 1.5M section (r ₃ ) of the illuminance value variable section (a _i ) meets the 0 to 5 Lux section value (a ₁ ) of the illumination section (a _i ). Becomes

3 is a flowchart illustrating a screen size and screen brightness control method of a projector included in a mobile terminal according to an exemplary embodiment of the present invention.

A detailed embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3, in step S301, the controller 110 previously stores a screen brightness control value table for each distance / illuminance in the current memory unit 130. Doing.

Here, in the control value table of the memory unit 130, as described in Tables 1 and 2, the screen brightness is gradually classified according to the distance from the projector 151 to the screen projected on the screen 210 and the peripheral illumination. A number of control values are stored.

The control values are values implemented to automatically adjust the screen brightness without discomfort for the user by the actual experimental value.

2A and 2B, the illuminance value refers to a value in which the illuminance value increases and the screen brightness increases as the peripheral illuminance of the projector 151 built in the portable terminal increases. The distance value refers to a value in which the screen brightness is increased by increasing the distance value as the measurement distance of the projector 151 built in the portable terminal increases. That is, the illuminance value means that as the peripheral illuminance increases, the distance value should also increase the screen brightness as the measurement distance increases.

As such, the controller 110 stores a control value for controlling screen brightness using the illuminance value and the distance value in the control value table of the memory unit 130.

First, in step S303, the controller 110 performs a project function when a user receives a project mode key 121 of the input unit 120, and otherwise performs another function in step S305. The other functions refer to various functions other than the control unit 110 performing in the project mode.

In step S303, when entering the project mode, in step S307, the control unit 110 detects the distance through the distance sensor 141, and as shown in FIG. 2A, a screen on which the screen is projected by the projector 151. The distance value (r _X ) to 210 is measured.

In operation S309, the controller 110 calculates the screen size W by using the measured distance value r _X. The screen size W is represented by the diagonal length l of the screen 220, as shown in FIG. 2B.

In operation S311, the controller 110 drives the projector driver 153 to display the calculated screen size W on the screen 210. The projector driver 153 projects the screen size W calculated by driving the projector 151 on the screen 210. That is, the controller 110 decreases the screen size as the measurement distance approaches, and increases the screen size when the measurement distance value increases. Also, referring to FIGS. 2A, 2B, and Equation 1, the controller 110 may control a ratio (d: c) of horizontal and vertical lengths, which is the screen size ratio, to display the screen size.

That is, the angle of view θ and d and c, which are ratios of the horizontal length and the vertical length, that are the screen size ratios, are determined according to the screen contents to be projected.

For example, when the contents of a multimedia format such as a video or a picture displayed on the display unit 160 are projected onto the screen 210 by the projector 151 built in the mobile terminal, the controller 110 may have a horizontal aspect ratio. The ratio between width and height (d: c) is such that the ratio of length to height (d: c) can be a wide aspect ratio such as 3: 1 or 16: 9 for multimedia formats. I can regulate it.

In addition, when conference or presentation data such as power point for presentation is projected onto the screen 210 by the projector 151 embedded in the mobile terminal, the controller 110 controls the ratio of the aspect ratio to the aspect ratio. You can adjust the width and height ratio (d: c) so that (d: c) can be a screen size ratio such as 2: 3 or 3: 5 to suit your presentation.

The angle of view θ is also determined according to the project screen size ratio. That is, when the target of the content to be projected through the projector 151 is determined, the ratio of the horizontal length to the vertical length (d: c), which is the screen size ratio according to the target, is determined, and the control unit 110 determines the determined screen. Since the screen size according to the size ratio is projected on the screen 210 through the projector 151, the angle of view angle θ to be projected is automatically determined.

Then, in step (S313), the controller 110 detects the ambient illuminance through the illuminance sensor 143 to measure the illuminance value.

In operation S315, the controller 110 inputs a distance value and an illuminance value respectively measured by the distance sensor 141 and the illuminance sensor 143 into a control value table already stored in the memory unit 130. Select the screen brightness control value.

In the screen brightness control value selection, as described in Tables 1 and 2, the screen brightness control value is selected according to the measured distance value and illuminance value.

Next, in step S317, the controller 110 drives the projector driver 153 to automatically adjust the screen brightness according to the distance to the screen 210 and the ambient illumination.

The projector driver 153 controls the screen brightness projected on the screen 210 by driving the projector 151. That is, the controller 110 decreases the light emission amount of the projector 151 when the screen distance is closer and the peripheral illumination is lowered. In addition, the controller 110 increases the amount of light emitted by the projector 151 when the screen distance increases and the peripheral illuminance increases.

However, when the screen distance is far but the peripheral illuminance is low or the screen distance is close but the ambient illuminance is high, the control unit 110 uses the control values of the portions where the distance and the illuminance are not proportional to each other in Table 1 and Table 2. The amount of light emitted.

The controller 110 may display the screen size and the screen brightness on the display unit 160. The screen size and the screen brightness are displayed on the display unit 160 to know the user's current situation.

In step S319, when the user re-enters the project mode key 121, the control unit 110 terminates the project function. Otherwise, the control unit 110 repeatedly performs the functions (steps S307 to S317).

As a result, in Figures 1 to 3, the control unit 110 is more accurate by reflecting not only the ambient illumination but also the distance to the screen 210 in automatically controlling the light emission amount of the projector 151 built in the portable terminal. You can finely control the screen brightness.

Since the controller 110 can measure the distance to the screen 210, the controller 110 can calculate the screen size so that the predetermined screen size can be projected onto the screen 210 through the projector 151 built in the mobile terminal. Can be.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the technical field of the present invention without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

1 is an internal configuration diagram of a mobile terminal having a projector according to an embodiment of the present invention;

2A is a side view of a projector projecting a screen according to an embodiment of the present invention;

2B is a plan view of a projector projecting a screen according to an embodiment of the present invention;

3 is a flowchart illustrating a screen size and screen brightness control method of a projector included in a mobile terminal according to an exemplary embodiment of the present invention.

Claims (10)

A screen size adjusting step of displaying a predetermined screen size with a distance value measured from a distance to a screen to be projected; A screen brightness selection step of selecting a screen brightness control value based on a distance value and an ambient light value measured in the screen size adjusting step; And a screen brightness control step of adjusting the brightness of the screen using the screen brightness control value selected in the screen brightness selection step. The method of claim 1, The screen size adjustment step A screen size calculating step of calculating a size of a projected screen by using the measured distance value; And a screen size display step of displaying the calculated screen size on a screen. The method of claim 2, The screen size [W (inch)] of the screen size calculating step is calculated according to < Equation 1 > , characterized in that the screen size and brightness control method of the projector of the mobile terminal. < Equation 1 > _{W = 0.8 × r X × tanθ} ×

(inch), _X is Represents a measured distance value, where θ represents the angle of view of the screen projected by the projector, and c and d represent the ratio between the vertical and horizontal lengths of the projected screen, respectively. The method of claim 1, The screen brightness selection step And a screen brightness control value is selected from a memory table according to the measured distance value and illuminance value. The method of claim 4, wherein The control value is And a plurality of screen brightness control values in which brightness information is recorded according to the screen distance and ambient illuminance. The method of claim 1, The screen brightness control step of controlling the screen size and brightness of the projector of the mobile terminal, characterized in that for automatically controlling the screen brightness of the projector with the control value. In a portable terminal having a projector, A memory unit for storing a control value table for controlling screen brightness according to distance and illuminance; A sensor for measuring a distance from the screen to be projected and a peripheral illuminance; A control unit for automatically controlling a screen size and a screen brightness according to a control value table of the memory unit and a screen distance and peripheral illumination by the sensing unit; And a projector unit for displaying the screen size according to the instruction of the controller, and projecting the screen at the corresponding brightness. The method of claim 7, wherein The sensing unit and a distance sensor for measuring the distance to the projected screen; Screen size and brightness control device of the projector of the portable terminal comprising a light sensor for measuring the ambient light. The method of claim 7, wherein The controller may include: a screen size converter configured to calculate a screen size to be projected using the measured distance value and convert the screen size into a corresponding screen size; And a screen brightness controller configured to adjust screen brightness from a control value table stored in the memory unit by using the measured distance value and illuminance value. The method of claim 7, wherein The projector unit includes a projector driver for adjusting screen size and screen brightness according to a control signal of a controller; And a projector for displaying the screen size according to the instruction of the projector driver and projecting the screen at the corresponding brightness.

Images