KR20060025741A - Display controll apparatus and method for readability increasing and prevention of eye-dazzling in the dark place - Google Patents

Abstract

A display control apparatus for increasing recognition rate and preventing glare in a place where light is insufficient, comprising: an optical sensor for detecting an amount of light of an ambient light; and comparing the light amount with a predetermined threshold at which glare starts, and outputting the comparison result A light quantity determining unit, an output method determination unit for selecting one of display modes for outputting white data on a black background screen when the light amount is less than the threshold value, a backlight controller for adjusting an output value of a backlight, and Power consumption by controlling the method of outputting data through a color display in a dark place through a predetermined display mode is configured to include a backlight for output in the applied output method, and the background and the display unit for displaying the data according to the display mode To reduce glare as well as to prevent glare There is an effect that it is possible to minimize the problems that can arise when using the substitute device. In addition, the present invention as described above can be applied to not only a device equipped with a portable display, but also a variety of fields, that is, a special device used in both bright and dark lighting conditions used in industrial sites.

Display, Light sensor, Back Light, Illuminating Power

Description

Display controll Apparatus And Method For readability Increasing And Prevention of eye-Dazzling In the Dark Place}             

1 shows a schematic structure of a device equipped with a portable display device;

Figure 2 shows a schematic structure of a device equipped with a portable display device according to the present invention.

3 shows a representation example of a portable display device under general illumination.

4 is a diagram showing an example of the representation of a display device in a situation where the amount of light is not sufficient.

5 is a view showing an example of the representation of a display device for adjusting the output of a general backlight.

6 is a view showing an example of the display device processed in the Youngsan conversion mode according to the present invention.

7 is a view showing an example of display processing processed in black and white mode according to the present invention;

8 is a flowchart of a display control operation according to the present invention;

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display control device for increasing recognition rate and preventing glare, particularly in a place where light quantity is insufficient.

A device equipped with a portable display device is used for communicating with the outside and controlling the device when performing a task. For example, tablet PCs (Personal Computers) or PDAs (Personal Digital Assistants), which can be applied in various fields, correspond to this, and can be used in various environments depending on which programs are run.

The environment of using a device equipped with a portable display device changes from time to time. In an office using fluorescent lighting, a toilet using incandescent lamps, and a general lighting environment in which sunlight is daylight, there is no big problem in using a display device. However, for example, flip cell phone lights are turned on or in folders, especially in dark situations such as theaters or sleeping, when working in dark places and when there is a special situation where work can be interrupted by light. When you see a bright light suddenly, such as when you open a mobile phone, you can cause damage to people around you in the theater due to glare, and when the mobile phone display device is turned on due to receiving messages during sleep, receiving calls, setting alarms, etc. Sleep disturbances occur.

Most portable display devices use LCD (Liquid Crystal Digital) screen with backlight to output data. In this case, the back light occupies a large portion of power consumption in portable devices such as mobile phones. For example, although rechargeable battery technology has made great strides compared to several years ago, the driving time of a portable device is hardly increased or reduced compared to several years ago. This is because not only various devices such as cameras have been installed in comparison with portable devices in the past, but also power consumption is greatly increased as display devices capable of displaying hundreds of thousands of colors in recent years instead of monochrome single-sided LCDs are mounted on both sides.

Therefore, various portable display devices equipped with optical sensors for controlling the LCD backlight output according to the amount of ambient light have been released. The value output from the light sensor indicates the amount of ambient light [Lux] as a digital or analog value. The purpose of mounting the optical sensor is to reduce power consumption through backlight control.

1 is a view showing a schematic structure of a device equipped with a portable display device according to the prior art.

Referring to FIG. 1, the optical sensor 100 outputs a lux value of the ambient light amount as a digital or analog value. The light quantity determining unit 102 compares the light quantity of the ambient light detected by the optical sensor 100 with a predetermined reference value. If the amount of light of the ambient light is lower than a predetermined reference value, it is determined that the ambient light is dark, and if it is higher than the reference value, it is determined that the ambient light is bright. The backlight controller 104 adjusts the output of the backlight 108 according to the determination result of the light amount determination unit 102. For example, if the ambient light is bright, the backlight output is reduced, and if it is dark, the backlight output is increased. On the contrary, if the ambient light is bright, the backlight output can be relatively increased to increase the recognition rate. If the ambient light is dark, the backlight output can be reduced to prevent glare. This is a matter of simple choice in product development, so it can be selected according to product characteristics and the purpose of reducing power consumption. When the power supply 106 is turned on, the brightness of the backlight 108 is adjusted to an output value controlled by the backlight controller 104. The display 110 outputs a background image and text at the brightness of the adjusted backlight 108 to a color or monochrome LCD.

Conventional portable displays can be divided into black and white LCD and color LCD. When outputting data, the black and white LDC does not separate into a background image and data, but only indicates the presence or absence of data. That is, the background has a color unique to the LCD, and the area in which the text or picture is located is a method of outputting data. Color LCDs often have a variety of colors in addition to data. That is, the displayed information is divided into data on the background screen (generally, a value stored in the memory) and data to be output. In general, the background screen has various screens according to the user.

Depending on the situation, the range of application may vary, but when the difference in the amount of ambient light changes drastically, such as in a theater or during sleep, the conventional backlight control method may be used to output bright light in the dark and dim light in the dark. Have problems. First, illuminating a bright light in a dark place can cause damage to people around you due to glare, which is even worse when the wallpaper is bright. On the contrary, if the dark light is output in a dark place, power consumption and glare can be reduced, but the recognition rate is reduced because it blurs not only the background but also the data part to be recognized.

When the power consumption is reduced by using the simple backlight control according to the prior art as described above, there is a problem that it is difficult to feel the user's convenience without greatly reducing the power consumption felt by the user.

Accordingly, an object of the present invention, which was devised to solve the problems of the prior art operating as described above, is to provide a display control apparatus for reducing power consumption used in a display device while eliminating glare caused by bright lighting according to the amount of ambient light. To provide.

It is still another object of the present invention to provide a display control apparatus supporting various display modes for controlling a method of outputting data through a color display in a dark place.

Method according to an embodiment of the present invention created to achieve the object as described above,                         

In the display control device to increase the recognition rate and prevent glare in the low light amount,

An optical sensor for detecting the amount of ambient light,

A light quantity judging unit which compares the light quantity with a predetermined threshold value at which glare is started and outputs the comparison result;

An output method determination unit for selecting one of display modes for outputting white data on a black background screen when the amount of light is less than the threshold value;

A backlight controller for adjusting an output value of the backlight;

A backlight output by the applied output method,

And a display unit for displaying a background screen and data according to the display mode.

According to another embodiment of the present invention, in the display control method for increasing the recognition rate and preventing glare in a place where the amount of light is insufficient,

Detecting and outputting the amount of ambient light;

Determining whether the measured amount of ambient light is less than or equal to the threshold;

If the output value is less than or equal to the threshold, selecting one of a black and white mode that is a display mode, an image switching mode, a black and white mode / video switching mode, and contrast enhancement algorithms;

Applying the selected display mode to original data;                         

And a process of outputting a background screen and data to which the display mode is applied.

Hereinafter, with reference to the accompanying drawings will be described in detail the operating principle of the preferred embodiment of the present invention. Like reference numerals are used to designate like elements even though they are shown in different drawings, and detailed descriptions of related well-known functions or configurations are not required to describe the present invention. If it is determined that it can be blurred, the detailed description thereof will be omitted. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

In general, in the case of a theater, a sleep, a dark conference room, and the like, a display portable device that emits bright light is rarely used for a long time. However, in such a special situation, bright letters on a dark background are easier to recognize than dark letters on a conventional light color background.

Accordingly, the present invention supports various display modes according to an environment using a device equipped with a portable display device. The display mode is largely divided into a black and white mode, an image inversion mode and a contrast enhancement mode. The display control apparatus of the present invention simply recognizes the light quantity of the environment in which the portable display device is used through an optical sensor, and controls the light before outputting data to be output from the portable display device according to the corresponding environment. It also gives the user the choice of the display mode as well as whether to use the display mode.

Hereinafter, the present invention will be described in detail with reference to FIG. 2.

2 is a view showing a schematic structure of a device equipped with a portable display device according to the present invention.

The optical sensor 200 outputs the light amount of the ambient light through the following Equation 1.

[Lux] = 1 lumen / (distance (m)) ²

이므로, 1㏅의 점광원(點光源)에서 방출되는 전광속(全光束)은 4

lm이 된다.Lux, a unit that represents the quantity of light, refers to the proportion of the speed of light and the area where light is shined. 1 lux refers to the time when the luminous flux of 1 lm (lumen) is uniformly shined over an area of 1㎡. Here, the lumen is a practical unit of luminous flux, and the luminous flux emitted to a portion of the unit stereoscopic angle from a light source having a uniform luminous intensity of 1 mW is 1 lm. The solid angle with respect to the center of the bulb is 4

Therefore, the total luminous flux emitted from one point of light source is 4

lm.

The light quantity determining unit 202 determines whether the output value of the optical sensor 200 is equal to or less than a predetermined lux-dazzling at which the glare starts. As a result of the determination, if the output value is equal to or less than the lux-dazzling, the backlight controller 204 and the output method determination unit 208 inform the current amount of ambient light is insufficient. The backlight controller 204 turns on the power 206 and determines an output value of the backlight 210.

The output method determination unit 208 selects one of a display mode, a black and white mode, an image inversion mode, and a contrast mode, and informs the display unit 212. In this case, the display mode may be selected according to a user's request, or the display control apparatus may be selected in advance according to a determination result of the output method determination unit 208. The display mode will be described later in detail with reference to FIGS. 3 to 7.

The display unit 212 applies the display mode selected by the output method determination unit 208 to the original data, and outputs the adjusted backlight and the background screen and data to which the display mode is applied.

Hereinafter, the display mode according to the present invention will be described in detail.

In the display mode according to the present invention, the recognition rate is increased in a place where the amount of light is insufficient, and white data is output on a black background to prevent glare. For this purpose, the display mode includes a black and white mode using a white and black distinction algorithm, an image inversion mode using a black and white conversion algorithm, and a contrast enhancement mode using a contrast enhancement algorithm.

The display information of the color display is not only always expressed in various colors but also black data on a white background or various other cases. Therefore, the display mode is applied according to the display information. Specifically, in the case of an SMS message represented by only a simple text, the black and white mode may be applied, and in the case of a multimedia message represented by various colors, an image reversal mode may be applied in which a recognition rate is increased while preventing glare. When the recognition rate is low even in the image reversal mode or the black and white mode, a contrast enhancement mode through a histogram smoothing process (binarization) may be additionally applied.

3 is an example of the output of the display device under general illumination. As shown, dark output data (i.e. text) is displayed on a bright background.

4 is an example of output of the display apparatus when the amount of light is not sufficient. Referring to FIG. 3, since the intensity of light in the white portion is recognized more strongly because the amount of ambient light is not sufficient, it is relatively difficult to recognize letters compared to FIG. 2. When the amount of ambient light is very small, such as in a theater, the brightness of the portable display as shown in FIG. 3 causes a great damage not only to the viewer but also to the surrounding people. In this case, there is a method of simply adjusting the output of the backlight as shown in FIG. 5. However, referring to FIG. 5, a situation in which the output of the backlight is weakened and the entire background screen becomes dark, thereby blurring the data information.

6 is an exemplary representation of a display apparatus processed in an image inversion mode according to the present invention.

As shown in the drawing, the display control device applies an image inversion mode in an environment in which light quantity is insufficient to display white output data on a black background. Here, the original data as shown in FIG. 2 is inverted by Equation 2 below.

Inversion Data = 255-Input Data

In this case, a value of 255 is generally a maximum value when each size of the RGB pixel value is represented by an '8Bit' size. Applying Equation 2 converts light pixel values to dark and dark pixel values to light.

If the input data has various indices, the display control device applies the contrast highlight mode through the contrast enhancement process after applying Equation 2 above. In this case, the contrast enhancement process removes the color information by leaving the RGB pixel values having the same size and leaves only the brightness information. The display control apparatus obtains an average value of the original data as shown in Equation 3 below.

Output (RED) = output (GREEN) = output (BLUE) = (input (RED) + input (GREEN) + input (BLUE)) / 3

When the above Equation 3 is applied, the range of the brightness value of the output data is from 0 to 255.

7 is an example of display processing processed in black and white mode according to the present invention.

The black and white mode simply represents the color of data to be output by using a binarization method according to Equation 4 to accurately recognize an urgent or important message in a short time in a dark situation.

(If the size of the original data is below the threshold)

                Output (RED) = output (GREEN) = output (BLUE) = '0'

(If the size of the original data is above the threshold)

                Output (RED) = output (GREEN) = output (BLUE) = '255'

That is, the display control apparatus sets a predetermined threshold value, and all of the original data is expressed as 255 when the original data is greater than or equal to the threshold value through Equation 4 below. 255 Output only two values.

8 is a flowchart of a display control operation according to the present invention.

Referring to FIG. 8, in step 800, the optical sensor measures the amount of light of the ambient light and outputs the Lux value. In step 802, it is determined whether the measured amount of ambient light is less than or equal to a predetermined threshold at which glare starts.

In step 804, if the determined value is greater than the threshold, the method returns to step 800. If the measured value is less than or equal to the threshold, the stored display mode is selected. Here, the display method is a black and white mode 806, an image inversion mode 808 and an image inversion mode + contrast enhancement algorithm 810.

In step 812, the selected display mode is applied to the original data, and the flow proceeds to step 814. In operation 814, the background image and the data to which the display mode is applied are output.

When the image inversion mode 808 is applied, the screen as shown in FIG. 6 is displayed, and when the monochrome mode 806 is applied, the screen as shown in FIG. 7 is displayed.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

In the present invention operating as described in detail above, the effects obtained by the representative ones of the disclosed inventions will be briefly described as follows.

The present invention, by controlling the way to output the data through the color display in the dark place through a predetermined display mode, the effect that can reduce the power consumption as well as minimize the problems that can occur when using a portable device to prevent glare There is. In addition, the present invention as described above can be applied to not only a device equipped with a portable display, but also a variety of fields, that is, a special device used in both bright and dark lighting conditions used in industrial sites.

Claims (12)

In the display control device to increase the recognition rate and prevent glare in the low light amount, An optical sensor for detecting the amount of ambient light, A light quantity judging unit which compares the light quantity with a predetermined threshold value at which glare is started and outputs the comparison result; An output method determination unit for selecting one of display modes for outputting white data on a black background screen when the amount of light is less than the threshold value; A backlight controller for adjusting an output value of the backlight; A backlight output by the applied output method, And a display unit for displaying a background image and data according to the display mode. The method of claim 1, wherein the output method determination unit, And the display mode can be selected at the request of a user. The method of claim 1, wherein the display mode, Apparatus characterized in that the image inversion mode, black and white mode and contrast mode. The method of claim 3, wherein the display unit, And when the image inversion mode is selected, output data is generated by subtracting a pixel of the input data at 255, which is a maximum value when each size of the RGB pixel value is represented by an '8 bit' size. The method of claim 3, wherein the display unit, When the black and white mode is selected, all of the original data is represented as '255' when the predetermined data is greater than or equal to a predetermined threshold value, and when the black and white mode is less than the threshold value, all are represented as '0'. The method of claim 1, wherein the display unit, And when the contrast enhancement mode is selected, the RGB pixel values of the original data have the same size to remove the color information and leave only the brightness information. In the display control method for increasing the recognition rate and preventing glare in the low light amount, Detecting and outputting the amount of ambient light; Determining whether the measured amount of ambient light is less than or equal to the threshold; If the output value is less than or equal to the threshold, selecting one of a black and white mode that is a display mode, an image switching mode, a black and white mode / video switching mode, and contrast enhancement algorithms; Applying the selected display mode to original data; And displaying a background image and data to which the display mode is applied. The method of claim 7, wherein the selecting process, And the display mode can be selected at the request of a user. The method of claim 7, wherein the display mode, And a video inversion mode, a black and white mode, and a contrast mode. The method of claim 9, wherein applying the display mode comprises: And when the image inversion mode is selected, output data is generated by subtracting a pixel of the input data at 255, which is a maximum value when each size of the RGB pixel value is represented by an '8 bit' size. The method of claim 9, wherein applying the display mode comprises: When the black and white mode is selected, all of the original data is represented as '255' when the predetermined data is greater than or equal to a predetermined threshold value, and when the monochrome data is less than the threshold value, all are represented as '0'. The method of claim 9, wherein applying the display mode comprises: When the contrast enhancement mode is selected, the RGB pixel values of the original data have the same size so that color information is removed and only brightness information remains.

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