KR100556707B1 - Image display device for automatically controlling focus and method thereof - Google Patents

Abstract

The present invention relates to an image display device capable of automatic focus adjustment by a user and a method thereof. The video display device includes a VCD IC for outputting a parabola-type dynamic focus voltage waveform, an OSD output unit for displaying a predetermined focus adjustment OSD pattern on a screen according to a request of an "auto focus adjustment" from a user, and the video display A sensor disposed on a screen of the device and detecting a focus adjustment OSD pattern displayed on the screen by the OSD output unit and outputting a sensor output signal corresponding thereto, and receiving a sensor output signal output from the sensor, and outputting the sensor output A control unit for detecting a thickness of the signal and determining and outputting a focus adjustment value according to the detected thickness, a signal synthesizing unit for adding a dynamic focus voltage waveform output from the VCD IC and a focus adjustment value output from the control unit; Amplifying unit for amplifying and outputting the signal output from the signal synthesizing unit The.

The video display device according to the present invention enables a user to automatically adjust focus by using a sensor for automatic convergence adjustment without adding a separate circuit.

Focus, Projection TV, Auto Convergence

Description

Video display device with automatic focus adjustment and method thereof {IMAGE DISPLAY DEVICE FOR AUTOMATICALLY CONTROLLING FOCUS AND METHOD THEREOF}

1 is a screen configuration diagram showing a form in which a predetermined number of sensors are arranged in accordance with the present invention.

2 is a block diagram schematically showing an internal configuration of a video display device according to the present invention;

3 is a waveform diagram illustrating a sensor output signal output from a sensor of an image display device according to the present invention.

4 is a waveform diagram showing a focus adjustment voltage value output from a D / A converter of a video display device according to the present invention;

5 is a waveform diagram showing a dynamic focus voltage output from a VCD IC of a video display device according to the present invention;

6 is a flowchart sequentially illustrating an automatic focus adjustment process of an image display device according to the present invention.

<Explanation of symbols for the main parts of the drawings>

200: VCD IC

210: control unit

220: memory unit

230: D / A Converter

240: signal synthesis unit

250: amplifier

260: Focus Divider

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device capable of automatically adjusting focus by a user, and more particularly to an image display device capable of automatically adjusting focus using a predetermined sensor in response to a request from a user.

Video display devices such as televisions and computer monitors must not only have excellent functions or designs of products to meet consumer's taste, but also need to improve visual emotional quality, thereby enhancing quality inspection. Here, "visual sensibility quality" refers to the quality of the sensory evaluation that is difficult to express in most quantitative values, such as the degree of clarity of pictures or characters, the degree of tired eyes, and the degree of color uniformity.

When displaying an image such as a picture or a character on the screen, the degree of clarity of the image is called focus.

In general, the focus adjustment operation is performed in the final inspection process of the production process of the product. The focus adjustment according to the related art is completed by the operator after displaying a specific pattern on an image display device such as a monitor, when the operator thinks that the pattern on the screen is the most clear while adjusting the focus adjustment button.

As a method for adjusting the focus, Korean Patent Application No. 10-1995-48111 (Publication No. 1997-57632) entitled "Digital Dynamic Focus Circuit" has been proposed. The patent application relates to a technology in which a consumer manually changes the focus shift for each corner portion using a digital circuit in a projection television. In the digital dynamic focusing circuit disclosed in the above application, the PLL unit which receives the vertical and horizontal synchronizing signals displays the OSD pattern for digital focus adjustment, and then the user manually varies the respective portions by the adjustment means to store the adjustment values in the memory. When the adjustment is completed, a technique is disclosed in which a focus value stored in a memory is added to a parabola focus waveform output from a VCD IC to correct an incorrect focus.

The invention disclosed in the above-described patent application can adjust the focus by the user, but the user needs to adjust the focus manually, which causes a lot of time and difficulty in adjusting the focus. In addition, since the conventional focus adjustment method is dependent on the subjective sense of the user, there is a problem that it is difficult to consistently adjust the focus on the product.

In order to solve the above-mentioned problem, Korean Patent Application No. 10-2000-61383 (Publication No. 2002-30525) has been proposed under the name of the invention "monitor focus automatic adjustment device". The above application relates to a screen focus adjusting device for display products such as various monitors and TVs. In particular, the vertical and horizontal size of the monitor focus adjustment pattern image generated by the monitor is calculated and the voltage adjustment amount is calculated to automatically adjust the monitor. The present invention relates to an automatic monitor focus adjustment device for adjusting focus.

The apparatus for automatically adjusting monitor focus may include a pattern generator for generating and outputting a focus adjustment pattern to a monitor, a camera unit for photographing a pattern image displayed on a monitor by the pattern generator through movement, and a pattern image photographed at the camera unit. An image processing unit converting and outputting the digital image signal, a control unit configured to calculate the voltage applied to the monitor by measuring the horizontal and vertical size of the pattern image by receiving the digital image signal, and to generate and output a voltage adjustment amount; Disclosed is a voltage adjusting unit that performs horizontal and vertical adjusting functions in accordance with the set voltage adjusting amount.

The invention disclosed in the patent application further comprises a separate pattern generator and camera unit to automatically adjust the focus during the production manufacturing process. As a result, when the focus volume is changed due to vibration or the like during the transportation to the consumer's home or when the power is turned on, the focus fluctuations before changing to a certain time or before the heat-run is performed, or the parts are changed or There is a problem that it is impossible to adjust the case in which the focus voltage fluctuates slightly due to aging.

An object of the present invention for solving the above problems is to provide a video display device that the user can automatically adjust the focus.

Another object of the present invention is to provide an image display device capable of automatically adjusting focus by using a sensor used for automatic convergence adjustment.

Still another object of the present invention is to provide a method in which a user can automatically adjust focus by using a sensor used for automatic convergence adjustment.

According to an aspect of the present invention, an image display apparatus capable of automatic focus adjustment includes a VCD IC for outputting a parabola-type dynamic focus voltage waveform, and a request for a " auto focus adjustment " An OSD output unit for displaying a focus adjustment OSD pattern on a screen, the OSD output unit arranged on a screen of the image display device, and detecting a focus adjustment OSD pattern displayed on the screen by the OSD output unit, and outputting a corresponding sensor output signal A controller for receiving a sensor and a sensor output signal output from the sensor, detecting a thickness of the sensor output signal, determining and outputting a focus adjustment value according to the detected thickness, and a dynamic focus voltage waveform output from the VCD IC. And a signal synthesizing unit for adding the focus adjustment value output from the control unit. It amplifies the signal outputted from the signal combiner group comprises amplifying portion for outputting.

Preferably, the video display device divides the screen into a predetermined number of regions and then arranges at least one sensor in each region. More preferably, the image display device further includes a memory unit and a D / A converter between the control unit and the signal synthesizing unit, and the control unit detects a focus adjustment value for each area and outputs the same to the memory unit. The memory unit stores focus adjustment values for each area, and the D / A converter converts and outputs the focus adjustment values stored in the memory unit.

According to another aspect of the present invention, an automatic focus adjusting method in a video display device having a sensor disposed on a screen includes: (a) displaying a focus adjustment OSD pattern on a screen; and (b) moving the sensor on the screen. Measuring the thickness of the displayed focus adjustment OSD pattern; (c) comparing the measured thickness of the OSD pattern for focus adjustment with a preset setting value; and (d) if the measured thickness is less than or equal to the setting value, (B) detecting and storing the optimal focus adjustment value while otherwise changing the focus adjustment value, and (e) summing the stored focus adjustment value and the dynamic focus voltage output from the VCD IC. Equipped.

The video display device according to the present invention enables a user to automatically adjust focus by using a sensor for automatic convergence adjustment without adding a separate circuit.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention. First, in adding reference numerals to the components of each drawing, it should be noted that the same components are denoted by the same reference numerals as much as possible, even if displayed on different drawings.

Hereinafter, a configuration of an image display device capable of automatic focus adjustment according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS. 1 to 5.

1 illustrates a screen of an embodiment of a video display device according to the present invention, in which at least one sensor is disposed in a predetermined area of the screen. Referring to FIG. 1, the screen is divided into nine regions, and sensors are disposed at predetermined positions in the remaining regions except the center region. Sensors are preferably disposed at the top, bottom, left and right corners of the screen, respectively. On the other hand, the sensor may use a sensor for automatic convergence adjustment.

When a request for " auto focus adjustment " occurs from a user, the OSD output unit of the video display device outputs a predetermined auto focus adjustment OSD pattern at a position where the sensor is arranged. At this time, it is preferable that the OSD pattern for automatic focus adjustment uses a rectangular pattern. The sensor detects a thickness of the OSD pattern for automatic focus adjustment displayed on the screen. The image display device automatically adjusts the focus by using a thickness of the OSD pattern for automatic focus adjustment detected by the sensor.

2 is a block diagram schematically showing the internal configuration of a projection television according to a preferred embodiment of the present invention.

2, the projection television according to the present invention includes a VCD IC 200, a controller 210, a memory 220, a D / A converter 230, a signal synthesizer 240, and an amplifier 250. , A focus divider 260 and an OSD output (not shown).

The VCD IC 200 outputs a parabola type dynamic focus voltage as shown in FIG. 5.

The controller 210 may be a microcontroller or the like. When a request for "auto focus adjustment" from the user occurs, the controller 210 displays an OSD pattern for auto focus adjustment at a position where a sensor on the screen is arranged. In addition, the controller 210 determines whether the focus is good or bad using the thickness d of the sensor output signal input from the sensor as shown in FIG. 3.

The memory unit 220 stores optimal focus information for each region in which each sensor is disposed, and the optimal focus information is used when the controller 210 determines the focus of each position. The optimal focus information stored in the memory unit includes optimal thickness data of a sensor output signal input from the sensor.

In addition, the memory unit 220 stores a predetermined focus adjustment voltage value (hereinafter, referred to as a 'focus adjustment value') for each region adjusted by the controller using a sensor output signal output from each sensor. .

The D / A converter 230 converts a digital focus adjustment value of each region stored in the memory unit 220 into an analog nonlinear DC signal and outputs the analog signal to the signal synthesis unit 240. 4 is a waveform diagram illustrating a focus adjustment value that is a nonlinear DC signal output from the D / A converter.

The signal combiner 240 synthesizes a dynamic focus voltage and a focus adjustment value output from the VCD IC 200 and the D / A converter 230, respectively, and outputs the synthesized dynamic focus voltage and the focus adjustment value to the amplifier 250.

The amplifier 250 amplifies and outputs the focus signal output from the signal combiner 240 through the focus divider 260.

Hereinafter, with reference to the accompanying Figure 6, the automatic focus adjustment process of the projection television having the above-described configuration will be described in detail.

First, when the "auto focus adjustment mode" is executed by a request from the user (step 600), the video screen currently being watched is muted, and then a rectangular focus adjustment OSD pattern is sequentially displayed for each sensor. (Step 620).

Next, the OSD pattern for automatic focus adjustment displayed near the first sensor corresponding to the first area is moved past the first sensor (step 622). In this case, when the sensor is attached to the upper and lower edges of the screen, the OSD pattern is moved from right to left, and if the sensor is attached to the left and right corners of the screen, the OSD pattern is moved upward and downward. It is preferable. As the OSD pattern for the auto focus adjustment is moved to pass the corresponding sensor, a square wave sensor output signal is output from the sensor (step 630), and the sensor output signal output from the sensor is input to the controller, and the controller The thickness of the sensor output signal is detected (step 640).

Next, the controller, to which the sensor output signal is input, measures the thickness d of the sensor output signal in the form of a square wave, and compares the measured thickness d with a preset value (step 650). If the thickness of the sensor output signal measured in step 650 is equal to or smaller than the set value, it is determined that the focus is good and the current DC voltage value is stored as a focus adjustment value for the first region in the memory unit (see FIG. Step 660). If the thickness of the sensor output signal measured in step 650 is greater than the set value, it is determined that the focus is not good, and a predetermined focus adjustment value for varying the dynamic focus voltage for the first area is output through the controller. (Step 652), the output focus adjustment value is summed with the dynamic focus voltage output from the VCD IC, amplified and supplied to the PRT (step 654), and the flow returns to step 620 to detect the thickness of the focus adjustment OSD pattern again. And repeat the process of comparison.

When the focus adjustment operation for the first region is completed through the above-described process, the above-described process is repeated for the remaining regions such as the second region and the third region, and the focus adjustment operation is performed for all the regions.

On the other hand, it is preferable to obtain the average value of the DC voltage value of the peripheral area in the area corresponding to the center portion of the entire screen and to adjust the focus by using the average value. The auto focus adjustment mode is completed through the above process (step 680).

When the auto focus adjustment mode is completed, the non-linear DC voltage value corresponding to each area stored in the memory unit and the dynamic focus waveform output from the VCD IC are summed, amplified, and provided to the PRT, thereby operating the entire screen to be in focus. .

As described above, in the detailed description of the present invention, specific embodiments have been described, but various modifications can be made 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 claims below, but also by those equivalent to the claims.

According to the present invention, the user can automatically adjust the focus, so that the user can easily adjust the focus of the projection television at any time. In addition, the image display device according to the present invention can easily implement the auto focus function without the addition of a complicated circuit by using a sensor used for automatic convergence adjustment.

Claims (8)

In the video display device capable of automatic focus adjustment, A VCD IC for outputting a parabola type dynamic focus voltage waveform; An OSD output unit for sequentially displaying an OSD pattern for automatic focus adjustment of a predetermined shape on each screen of the image display device divided into a predetermined number of areas according to a request of an "auto focus adjustment" from a user; At least one sensor disposed on each of the divided screens to detect the OSD pattern for auto focus adjustment sequentially displayed by the OSD output unit; A controller which receives a detection signal output from the sensor and detects a thickness of an OSD pattern for automatic focus adjustment included in the sensor output signal and determines a focus adjustment voltage value according to the detected thickness of the OSD pattern for automatic focus adjustment; A signal synthesizer configured to add a dynamic focus voltage waveform output from the VCD IC and the focus adjustment voltage value output from the controller; And An amplifier for amplifying and outputting the signal output from the signal synthesis unit It is equipped with a video display device capable of automatic focus adjustment. delete The image display device of claim 1, wherein the sensor is an automatic convergence adjustment sensor. The display apparatus of claim 1, wherein the image display device further comprises a memory unit and a D / A converter between the control unit and the signal synthesis unit. The control unit detects a focus adjustment value for each region and outputs it to the memory unit, and the memory unit stores the optimum focus information for each region and the detected focus adjustment value, and the D / A converter stores the memory unit. And converting and outputting a focus adjustment value for each of the areas stored in the image display device. In the automatic focus adjustment method in a video display device having a sensor arranged on the screen, (a) sequentially displaying an OSD pattern for automatic focus adjustment on each screen of the video display device divided into a predetermined number of regions; (b) measuring the thickness of the auto focus adjustment OSD pattern by moving the auto focus adjustment OSD pattern through at least one sensor on each of the divided screens; (c) comparing the thickness of the measured OSD control pattern for auto focus with a preset setting value; (d) if the measured thickness is less than or equal to the set value, storing the current focus adjustment voltage value; otherwise, detecting and storing the optimum focus adjustment voltage value while changing the focus adjustment voltage value; (e) obtaining an average value of the focus adjustment voltage values detected on the peripheral area screen on which the sensor is disposed, and storing the average value of the focus adjustment voltage values on the center area screen on which the sensor is not disposed; And (f) summing the stored focus adjustment voltage value and the dynamic focus voltage output from the VCD IC. The automatic focus adjustment method comprising a focus adjustment. delete delete delete

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