KR20020050766A - Apparatus and method for luminosity control of display in image terminal - Google Patents

Abstract

PURPOSE: An apparatus and method for controlling the brightness of the display part of a moving picture terminal is provided to automatically and optimally adjust the brightness of the LCD of a moving picture terminal by detecting the brightness of an external light through an image sensor and controlling the power of an LCD LED(Light Emitting Diode) or a keypad LED. CONSTITUTION: A moving picture terminal judges whether a moving picture call is selected(S11). If the moving picture call is selected, the moving picture terminal sets a threshold and a check period(S12). If the first check period comes(S14), the moving picture terminal reads an AGC(Auto Gain Control) value(S15). The moving picture terminal compares the read AGC value with the threshold(S16). In case that the AGC value exceeds the threshold, the moving picture terminal turns off an LCD(S17). However, if the AGC value is less than the threshold, the moving picture terminal turns on the LCD(S18). Then the moving picture terminal judges whether an AGC variation is larger than a preset variation width(S19). If the AGC variation is larger than the preset variation width, the moving picture terminal decreases the check period(S20). Meanwhile, if the AGC variation is smaller than the preset variation width, the moving picture terminal increases the check period(S21).

Description

Apparatus and method for luminosity control of display in image terminal}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video terminal, and in particular, to detect the brightness of external light with an image sensor to control the power of a light emitting diode (LED) of a liquid crystal display (LCD) or a keypad light emitting diode. The present invention relates to an apparatus and method for controlling brightness of a display unit in a video terminal to provide an optimal use condition of the brightness of the display unit according to the environment and to extend the use time of the video terminal.

In general, the video terminal is used in a mobile communication system, and is a device capable of transmitting and receiving video, and can make a call while watching the video of the other party during a call.

Conventionally, the wireless terminal adjusts the brightness of the display window step by step according to the brightness control key input or automatically adjusts the brightness of the display window according to the surrounding brightness. Patent Application No. 96-8885, "The display device brightness control device and method of the wireless terminal" is configured as follows.

FIG. 1 is a block diagram of a wireless terminal using the conventional brightness control key. In the brightness control of the display window of the wireless terminal, the brightness control key 7 generating a brightness control key signal to select the brightness can be adjusted in various stages. And an EL on control signal for brightness adjustment in accordance with a key input of the brightness adjustment key 7 and an EL for brightness adjustment from the CPU 1 for generating display data according to each function. An LCD for displaying various information signals provided from the CPU 1 by changing the brightness according to the current supplied from the EL oscillation and driving unit 5 and the EL oscillation and driving unit 5 for supplying a variable current by receiving the ON control signal. It consists of (6).

The brightness control key 7 includes a brightness control up key for increasing the brightness of the display window by one step; It is composed of a brightness control down key to decrease the brightness of the display step by step.

FIG. 2 is a flowchart illustrating a brightness control method of a display unit in the wireless terminal of FIG. 1 as follows.

Displaying data according to the function performed in the wireless terminal (S1), determining which screen brightness key is input after data display (S2), and if the up key of the screen brightness key is input to increase the screen brightness by one step Step (S3), and if the down key of the screen brightness key is input, step (S4) to lower the screen brightness by one step, and after raising or lowering the screen brightness and determining whether to end the screen brightness control, if not finished any screen brightness Step S5 of judging whether a key has been entered is performed.

3 is a block diagram of a wireless terminal using a conventional yellow cadmium (Cds) as a sensor as follows.

In the brightness control of the display window of the wireless terminal, a sensor 9 for sensing the brightness of the surroundings and converting the output to a low voltage, and an A / D converter for converting and outputting the voltage output from the sensor 9 into a digital signal 8 ), The CPU 1 which receives the digitally converted signal from the A / D converter 8 and determines the brightness state of the surroundings, and outputs the EL on control signal, and the EL on control output from the CPU 1. EL oscillation and driving section 5 for adjusting the brightness of the display window by a signal.

The receiver 3 receives a radio signal through an antenna, and the demodulator 4 demodulates the signal input from the receiver 3 and transmits it to the CPU 1, and the memory 2 controls the CPU 1. Store data and processed data.

1 and 2 are to adjust the brightness of the display window using the brightness adjustment key (7), press the brightness adjustment up key to brighten the display brightness, press the brightness adjustment down key to darken the brightness, the key The inputs allow you to adjust the brightness of the display.

3 illustrates the EL oscillation and driving unit 5 using the A / D converted value by detecting the amount of light without using the brightness adjustment key by using the yellow river cadmium whose resistance value changes according to the brightness of the light. By controlling the brightness of the display window can be adjusted.

As described above, in the related art, it is cumbersome to assign a separate key to adjust the brightness of the display window, and in order to add yellow yellow cadmium for detecting a separate light to the wireless terminal, a circuit design must be considered. There is a problem that can be configured only by adding the parts required for the D conversion.

The present invention has been made to solve the conventional problems, by detecting the brightness of the external light with an image sensor to control the light emitting diode of the liquid crystal display device or the light emitting diode of the keypad to automatically adjust the brightness of the display window of the video terminal An object of the present invention is to provide an apparatus and method for controlling brightness of a display unit in a video terminal providing an optimal use condition and extending the use time of the video terminal.

1 is a block diagram of a wireless terminal using a conventional brightness control key.

FIG. 2 is a flowchart illustrating a brightness control method of a display unit in the wireless terminal of FIG. 1.

Figure 3 is a block diagram of a wireless terminal using a conventional yellow river cadmium sensor.

Figure 4 is a block diagram of a brightness control device of the display unit in the video terminal according to the present invention.

5 is a flowchart illustrating a brightness control method of a display unit in a video terminal according to the present invention;

<Explanation of symbols for main parts of the drawings>

10: wireless processing unit 11: transmission unit

12 receiver 13 modem

14: memory / keypad 15: power supply

20: video processing unit 21: video detection unit

22: image processing unit 23: memory

24: LCD control unit 25: LCD

A feature of the present invention for achieving the above object is a wireless processing unit for allowing a video terminal to transmit and receive data with the base station and perform a call function; And a video processor connected to the wireless processor and configured to display video data by receiving video data and adjusting an erection according to brightness of external light.

In addition, the video processing unit of the present invention, the image sensing unit for detecting and inputting a video image; An image processor which processes the moving image data sensed by the image sensing unit and displays the moving image data under an optimal condition according to the brightness of the external light; A memory used to process moving image data in the image processing unit; A display means controller for controlling the display means according to the control of the image processor; And display means for displaying the input data under the control of the display means controller.

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

Figure 4 is a block diagram of the brightness control device of the display unit in the video terminal according to the present invention, the wireless processing unit 10, the wireless processing unit 10 and the wireless processing unit 10 so that the video terminal can transmit and receive data with the base station and perform a call function; The video processing unit 20 is configured to receive video data and display the video data under optimal conditions according to the brightness of the external light.

On the other hand, the radio processor 10 is connected to the transmitter 11 for modulating the data transmitted to the base station, the receiver 12 for receiving and demodulating the data transmitted from the base station, the transmitter 11 and the receiver 12 A memory unit (13) having a modem unit (13) for processing transmitted and received data, a memory for data processing of the modem unit (13), and receiving a key input; The power supply unit 15 supplies power to the video terminal.

In addition, the video processor 20 processes the video data detected by the video sensor 21 and the video data sensed by the video sensor 21 to detect the video image, and the video data under optimal conditions according to the brightness of the external light. Display means for controlling the display means (LCD) under the control of the image processor 22, the memory 23 used to process the moving image data in the image processor 22, and the image processor 22 so as to control the display. (LCD) control section 24 and display means (LCD) display means (LCD) 25 for displaying the input data under the control of the control section 24.

The image detecting unit 21 receives the digital data from the sensor unit which receives the video data, the A / D converter which converts the analog data received by the sensor into digital, and the digital data converted by the A / D converter. It consists of a digital signal processor (DSP, Digital Signal Process) for processing and controlling the speed of the shutter according to the brightness of the light.

5 is a flowchart illustrating a brightness control method of a display unit in a video terminal according to the present invention.

When the video call is selected in the video terminal, a first step S11 to S15 of setting a threshold value and a check period and reading an AGC (Auto Gain Control) value and a second controlling the display means by comparing the read AGC value and the set threshold value Steps S16 to S18 and a third step S19 to S22 for checking the degree of change of the AGC after the second step to vary the check period.

The first step is a step of determining whether a video call is selected in the video terminal (S11) and, if the video call is selected, set a threshold and set a first check period of the AGC value to supply power to the video sensing unit 21. If the video call is not selected (S12) and the video call is not selected, the threshold value is set, and a second check period of the AGC value is set so that the power supply status of the image sensing unit 21 can be grasped so that the same threshold value is obtained. And performing the display under optimal conditions using the first and second check periods (S13).

On the other hand, the second step is a step (S14) (S15) of reading the AGC value when the check period is reached, the step of comparing the read AGC value and the set threshold (S16), and if the AGC value exceeds the threshold, the display means is turned off Step S17, and turning on the display means when the AGC value is equal to or lower than the threshold value (S18).

In addition, the third step is to read the AGC value to determine whether the AGC change is greater than the predetermined change width (S19), and if the AGC change is larger than the predetermined change width, reducing the check period (S20), and the AGC change is If smaller than the preset change width, the check period is increased (S21).

The brightness control device and method of the display unit in the video terminal according to the present invention are as follows.

The configuration of the video terminal according to the present invention is as shown in FIG. Unlike the existing terminal, the video terminal has a video related part added. The video terminal includes a wireless processing unit 10 and a video processing unit 20. The wireless processing unit 10 allows the video terminal to transmit and receive data with a base station and perform a call function. 12), modem section 13, memory / keypad 14, and power supply section 15.

The transmitter 11 modulates data and transmits the data to the base station. The receiver 12 receives and demodulates the data transmitted from the base station. The modem unit 13 is connected to the transmitter 11 and the receiver 12 to transmit and receive data. Process the data.

It also has a memory to be used to process the data of the modem unit 13 and a keypad for receiving key input, the power supply unit 15 supplies power to the video terminal.

On the other hand, the video processor 20 is connected to the wireless processor 10, and receives the video data to display the video data in the optimum conditions according to the brightness of the external light, the image sensing unit 21, the image processing unit 22 ), A memory 23, an LCD control unit 24, and an LCD.

The image detecting unit 21 includes a sensor unit which receives video data, an A / D converter which converts analog data received by the sensor into digital, and a digital signal processor (DSP) which processes and controls digital data. Digital signal processors can implement Auto Light Control (ALC), which controls the shutter speed based on light brightness.

The image processor 22 processes the video data sensed by the image detector 21 to control the video data to be displayed under the optimal condition according to the brightness of the external light, and includes a large scale integrated circuit (LSI). . Thus, the image processor 22 converts the data received from the video sensor 21 during the video call according to the communication standard and transmits the data to the air through the transmitter 11 through the modem unit 13. The received data is transmitted to the image processing unit 22 through the modem unit 13, and is displayed to the user through the LCD 25 via the LCD control unit 24.

The memory 23 is used to process video data by the image processor 22, and the LCD controller 24 controls the LCD according to the control of the image processor 22.

The LCD 25 displays the input data under the control of the LCD control unit 24, and may mainly use a TFT (Thin-Film Transistor) LCD, and may use a transmissive type, a reflective type, and a transflective type. In the case of the transmissive type, the LED light must always be used during use so that the user can see the displayed result. In the case of the reflective type and the semi-transmissive type, the light is emitted only in the dark and the light is displayed in the bright area without using the light emitting diode.

Therefore, in the process of receiving the image data from the image sensing unit 21 in the video terminal using the transmissive or transflective type LCD, it reads the AGC gain value of the ALC and senses the brightness of the light. By controlling, the user can easily use the video terminal in a bright or dark place without unnecessary operation of the user. In addition, it is possible to extend the use time of the video terminal by minimizing unnecessary power consumption.

Meanwhile, the brightness control method of the display unit in the video terminal according to the present invention is illustrated in FIG. 5.

The operation state of the video terminal can be largely divided into a video call and a non-video call.In the case of a video call, the threshold value of the AGC value is set to X, the check period of the AGC value is set to T1, and the video call is If not, the threshold of the AGC value is set to X and the check period of the AGC value is set to T2.

On the other hand, the threshold value X is set to be the same, and the check period is set differently as follows. That is, the threshold value X sets the optimal value to the threshold value X after the AGC value read out from the image sensing unit 21 is tested several times in the displayable state of the LCD, and power is supplied to the image sensing unit 21. In this state, the check period is set to T1, and when the power is not applied to the image sensing unit 21, the check period is set to T2 in consideration of power consumption to set different check periods of T1 and T2.

When the check period is reached, the AGC value is read. When the AGC value is larger than the set threshold X, the light emitting diode of the keypad 14 and the light emitting diode of the LCD 25 are turned off. When the AGC value is smaller than the set threshold X, the LED on the keypad 14 and the LED on the LCD 25 are turned on, so that the user can use the LCD and the keypad without additional operation. Can give

On the other hand, by comparing the amount of change in the AGC value to reduce the check period when the change is large, it is possible to reduce the inconvenience in use, and if the change in the AGC value is small by increasing the period to check the video detector 21 It can reduce the time that power is applied.

If the display is not terminated on the LCD, the check cycle is compared again. If the display is terminated on the LCD, the operation ends.

As described above, the present invention detects the brightness of the external light with an image sensor and controls the light emitting diode of the LCD or the light emitting diode of the keypad to be turned on / off to provide an optimal use condition according to the surrounding brightness of the display window of the video terminal. It will extend the usage time of the video terminal.

As described above, in the present invention, the brightness of the external light is sensed by the image sensor to control the power of the LED or keypad LED of the LCD to provide the optimal use conditions according to the brightness of the video terminal according to the surrounding brightness and It is effective to prolong the use time.

In addition, by controlling the brightness of the display unit by detecting the brightness of the external light by using the image sensing unit in the video terminal can be applied without changing the additional circuit or mechanism structure, and minimize the unnecessary waste of power of the video terminal It also increases the use time.

Claims (7)

A wireless processor for allowing a video terminal to transmit and receive data with a base station and perform a call function; And a video processor connected to the wireless processor and configured to display video data by receiving video data and adjusting brightness according to brightness of external light. The method of claim 1, wherein the video processing unit, An image detecting unit for detecting and inputting a moving image; An image processor which processes the moving image data sensed by the image sensing unit and displays the moving image data under an optimal condition according to the brightness of the external light; A memory used to process moving image data in the image processing unit; A display means controller for controlling the display means according to the control of the image processor; And display means for displaying the input data under the control of the display means control unit. The method of claim 2, wherein the image detection unit, A sensor unit which receives video data; An A / D converter converting the analog data received by the sensor into digital; The brightness control device of the display unit in the video terminal comprising a digital signal processing unit for receiving the digital data converted by the A / D conversion unit to process and control the digital data to control the shutter speed according to the brightness of the light . Setting a threshold and a check period and reading an AGC value when a video call is selected in the video terminal; A second step of controlling the display means by comparing the read AGC value with a set threshold value; And a third step of varying a check period by checking a degree of change of the AGC after the second step. The method of claim 4, wherein the first step, Determining whether a video call is selected in the video terminal; When the video call is selected, setting a threshold value and setting a first check period of an AGC value to determine a power-on state of the video detector; If the video call is not selected, the threshold value is set, and a second check period of the AGC value is set so that the power supply state of the video sensing unit can be grasped so that the same threshold value and the first and second check periods are used. The brightness control method of the display unit in the video terminal further comprising the step of performing the display under the condition. The method of claim 4, wherein the second step, Reading the AGC value when the check period is reached; Comparing the read AGC value with a set threshold value; Turning off the display means if the AGC value exceeds a threshold; And turning on the display means when the AGC value is less than or equal to the threshold value. The method of claim 4, wherein the third step, Reading an AGC value to determine whether an AGC change is greater than a predetermined change width; Reducing the check period if the AGC change is greater than a predetermined change width; If the AGC change is smaller than a predetermined change width, further comprising increasing a check period.