KR20040074368A - Method and apparatus for controlling auto convergence of display device - Google Patents

Abstract

PURPOSE: An apparatus and a method for controlling auto convergence of a projection TV are provided to determine whether convergence is corrected or not before the execution of auto convergence of the projection TV. CONSTITUTION: An apparatus for controlling auto convergence of a projection TV having a screen(100) for displaying a picture corresponding to a video signal and the first to eighth sensors(101,102,103,104,105,106,107,108) including the first and second optical sensors for sensing a pattern display on the screen includes an amplification unit(110), a comparison unit(120), and a microcomputer(160). The amplifier receives values sensed by the first to eighth sensors and amplifies the values to predetermined values. The comparator receives the amplified values and compares the received values. The microcomputer receives the output signal of the comparator and judges a degree of introduction of external light to determine whether auto convergence is executed and whether a factory control mode is returned. The microcomputer informs a user whether external light is introduced or not.

Description

Method and apparatus for controlling auto convergence of display device

The present invention relates to an image display device, and more particularly, to an apparatus and method for auto-convergence adjustment of a projection TV to adjust the degree of convergence adjustment by checking whether the external light is input before the execution of auto-convergence when adjusting the auto-convergence of the projection TV.

In general, video display devices are being introduced to consumers in various forms, starting with small models such as 14-inch analog receivers and projection TVs of 60 inches or more.

Projection TV is a device that displays images on the screen by projecting the colors of R, G, and B on the screen using respective CRTs.The quality of the projection TV is W / U (White Uniformity), B / U (Bright). It consists of various items such as Uniformity, Convergence, Focus, and Distortion.

Here, convergence means that the R (Red), G (Green), and B (Blue) beams emitted by the electron gun are collected at a point on the screen by the magnetic field of the deflection yoke, but the influence of the abnormality or the magnetic field of the deflection yoke If the beam is not deflected as desired, mis-convergence occurs and color shift occurs on the screen.

In other words, three beams of R, G, and B must be gathered exactly at one point to become white. When the image is miss-converged, abnormally colored lines such as R, G, and B will be displayed next to the white line. It acts as a factor to decrease.

Therefore, in order to show white color, the light projected from each C, R, G, and B tubes should be collected in one place. Here, the convergence of R, G, and B light in one place is called auto convergence. As the digital TV broadcasting starts, a projection TV is in the spotlight as a display that meets the needs of a large screen.

Such auto convergence generates a specific pattern on the screen, and uses the optical sensor to determine the degree of convergence and then corrects it.

Hereinafter, with reference to the accompanying drawings illustrating a convergence adjustment apparatus of the projection TV according to the prior art.

1 is a block diagram showing the configuration of the convergence adjustment device of the projection TV according to the prior art, Figure 2 is a view showing a detection method of the optical sensor according to the movement of the measurement pattern, Figure 3 is a light according to the movement of the measurement pattern This is a waveform diagram showing the output waveform of the sensor.

As shown in FIG. 1, the convergence adjusting apparatus of the projection TV according to the related art includes a screen 10 for displaying an image signal and first to eighth sensing units mounted on a predetermined area of the screen 10. 11 to 18, an amplification unit 20 that receives the sensed values sensed through the first to eighth sensing units 11 to 18 and amplifies and outputs the amplified by a predetermined multiple, and amplified by the amplifying unit 20. A comparison unit 30 for receiving and comparing the amplified value to the inverting (-) terminal and the non-inverting (+) terminal as preset, and an AND gate 40 for receiving and calculating the output of the comparison unit 30, and Inverter 50 for receiving and inverting the output value of the comparison unit 30, D flip-flop 60 for receiving and latching the output value of the inverter 50, and the D flip-flop 60 The output signal is controlled to receive the latched data through and adjust the convergence. It is composed of 70.

In the first to eighth sensing units 11 to 18, the first, third, fifth, and seventh sensing units 11, 14, 15, and 17 are centered on each of the four sides of the screen 10. The second, fourth, sixth and eighth detectors 12, 14, 16 and 18 are located at the four corners of the screen 10. In addition, the first to fourth detectors 11, 12, 13, and 14 are the first group, and the fifth to eighth detectors 15, 16, 17, and 18 are the second. Divided into groups, the first to eighth sensing units 11 to 18 include a plurality of first and second optical sensors A and B, as shown in FIG. 2.

In addition, the amplification unit 20 is a first amplification for receiving and amplifying the sensed values respectively sensed by the first and second optical sensors (A) (B) in the first to fourth detection units (11 to 14) A second amplifier for receiving and amplifying the sensed values detected by the first and second optical sensors (A) and (B) in the unit 21 and the fifth to eighth sensing units 15 to 18, respectively. It consists of 22.

Here, the first amplifier 21 is a first amplifier (21a) for receiving and amplifying a value detected by the second optical sensor (B) in the first to fourth sensing units (11 to 14), And a second amplifier 21b for receiving and amplifying a sensed value detected by the first optical sensor A in the first to fourth detectors 11 to 14, and the second amplifier 22. Is a third amplifier 22a for receiving and amplifying a detection value detected by the fifth to eighth detectors 15 to 18 through the second optical sensor B, and the fifth to eighth detectors (a). 15 to 18 are configured as a fourth amplifier 22b for receiving and amplifying a sensed value detected through the first optical sensor A.

The comparator 30 may include a first comparator 31 configured to receive and compare output values of the first and second amplifiers 21a and 21b through inverted (-) and non-inverted (+) terminals, respectively, And a second comparator 32 that receives the output values of the third and fourth amplifiers 22a and 22b through the inverting (-) and non-inverting (+) terminals, respectively, and compares them.

Referring to the operation of the automatic convergence adjustment device of the projection TV according to the prior art configured as described above are as follows.

When the user selects the auto convergence adjustment mode, the first to eighth detection units 11 to 18 detect the position of the pattern generated for the convergence adjustment, and the first to eighth detection units 11 to 18. ) And the detected value detected through the first optical sensor A is input to the second and fourth amplifiers 21b and 22b, and the detected value detected through the second optical sensor A is determined by the first and the second optical sensor A. It is input to the three amplifiers 21a and 22a and amplified by twice as much as the amplification degree of the second and fourth amplifiers 21b and 22b and output.

The amplified value b1 amplified by the first amplifier 21a is input to the inverting (−) terminal of the first comparator 31 and amplified value a1 amplified by the second amplifier 21b. Is input to the non-inverting (-) terminal of the first comparator 31 to output a comparison value (c1). The amplified value b2 amplified by the third amplifier 22a is input to the inverting (−) terminal of the second comparator 32 and amplified by the fourth amplifier 22b. Is input to the non-inverting (+) terminal of the second comparator 32 to output a comparison value c2.

Output values of the first and second comparators 31 and 32 are inputted from the AND gate 40 to the inverter 50, and the value inverted through the inverter 50 is the D flip-flop. Input to 60 to latch the data to the input of the microcomputer 70.

Herein, the sensing method according to the movement of the measurement pattern through the first to eighth sensing units 11 to 18 will be described with reference to FIGS. 2 and 3.

First, when the measurement pattern is red (even when green or blue) is moved downward for the pattern, it can be described through the detection process of the third sensor (13). First, as shown in FIG. 2, when the pattern is at the preset first sensing position t1, since the pattern does not overlap with both the first optical sensor A and the second optical sensor B, light is not detected. As shown in FIG. 3, it can be seen that a low signal is also output as a low signal is applied to both the first and second amplifiers 21a and 21b.

In addition, a low signal output from the first and second amplifiers 21a and 21b is input to the non-inverting (+) and inverting (-) terminals of the first comparator 31, respectively. The one comparator 31 outputs a high signal. This is because a slight pull-up resistor is connected to the non-inverting (+) terminal of the first comparator 31.

As shown in FIG. 2, when the pattern is at the second detection position t2, the first optical sensor A overlaps about 1/2 of the pattern, and the second optical sensor B is still a pattern. This overlap does not indicate that the light is not detected. In this case, since the output value of the second amplifier 21b is larger than the output value of the first amplifier 21a, the first comparator 31 continuously outputs a high signal.

In addition, as shown in FIG. 2, when the pattern comes to the third detection position t3, the first optical sensor A overlaps the pattern, and the second optical sensor B overlaps about 1/2. As the state overlaps, the first amplifier 21a in which the output value of the second amplifier 21b that has received the detection value of the first photosensor A receives the detection value of the second photosensor B. Will be twice the output of (A = 2B). Therefore, since the amplification degree of the first amplifier 21a is twice as large as that of the second amplifier 21b, the output values of the first amplifier 21a and the second amplifier 21b are the same. The output value of the first comparator 31 inputted thereafter outputs a low signal.

In this manner, a signal is also output from the second comparator 32, and outputs of the first and second comparators 31 and 32 are calculated by being inputted to the inverter 50 and inverted. A high signal is outputted, and the signal is inputted to the clock of the D flip-flop 60 to latch data, and a high signal is inputted to the microcomputer 70.

The microcomputer 70 determines that the position of the pattern is the third set position t3 when the port connected to the microcomputer 70 goes from low to high, so that the initial of the pattern is determined. The distance from the position to the third set position t3 is measured to determine how far the convergence is, and the correction control signal is output accordingly.

As described above, the projection TV's auto-convergence control device according to the prior art does not recognize that the external light is input when the external light or the light enters when the auto convergence is executed, and thus the convergence adjustment accuracy is lowered by correcting the convergence. There was a problem that the image quality is deteriorated.

The present invention has been made to solve the above problems, and to provide an apparatus and method for auto-convergence adjustment of the projection TV to determine whether the convergence correction by checking the external light input prior to the execution of the auto-convergence TV. have.

1 is a block diagram showing an auto convergence adjustment device of a projection TV according to the prior art.

2 is a diagram illustrating the detection criteria according to the movement of the measurement pattern

3 is a waveform diagram illustrating an output waveform of a comparator according to an output waveform of the amplifier illustrated in FIG. 1.

Figure 4 is a block diagram showing an auto convergence adjustment device of the projection TV according to the present invention

5 is a flowchart illustrating a method for adjusting auto convergence of a projection TV according to the present invention.

Explanation of symbols for main parts of the drawings

100: screen 101-108: detection unit

110: amplifying unit 111: first amplifying unit

112: second amplifier 120: comparison unit

121: first comparator 122: second comparator

140: end gate 150: inverter

160: D flip-flop 170: microcomputer

180: message output unit

In order to achieve the above object, the apparatus for adjusting auto-convergence of a projection TV according to the present invention includes a screen for displaying an image signal, and a first and second for detecting a pattern displayed on the screen by being mounted on a predetermined area of the screen. In the projection TV including the first to eighth sensors having the optical sensors, the detection values sensed through the first to fourth and fifth to eighth sensors are respectively input and amplified by a predetermined multiple. The amplification unit, a comparison unit for receiving and comparing the value amplified by the amplification unit, and determining the degree of external light input by receiving the output signal of the comparing unit to determine whether to execute auto convergence and return to the factory adjustment mode, and It is configured to include a microcomputer to inform the input of external light to have a feature.

In order to achieve the above object, an automatic convergence adjustment method of a projection TV according to the present invention includes a screen and a projection TV having a plurality of detection units mounted at a predetermined position of the screen to detect a degree of convergence. Detecting an external light input when the mode is selected, returning to an initial state when the external light input is detected, outputting a message according to the external light input to the user, and executing auto convergence if the external light input is not detected And receiving the detection values from the plurality of detection units when the auto convergence is executed, and determining whether to return to an initial state according to whether there is an abnormality of the detection values.

Preferably, the detecting of the external light input may include external light according to whether one of a high, low, and pulse (high and low coexistence) signals input through the plurality of sensing units is input. It is characteristic to judge input level.

Hereinafter, with reference to the accompanying drawings, the auto-convergence adjustment apparatus and method of the projection TV according to the present invention will be described in detail.

4 is a block diagram illustrating an apparatus for adjusting auto convergence of a projection TV according to the present invention, and FIG. 5 is a flowchart illustrating a method for adjusting auto convergence of a projection TV according to the present invention.

As shown in FIG. 4, the apparatus for auto-convergence adjustment of projection TV according to the present invention includes a screen 100 for displaying an image signal and first to eighth sensing units mounted on a predetermined area of the screen 100. 101 to 108, an amplifying unit 110 for receiving the sensed values detected through the first to eighth sensing units 101 to 108, amplifying and outputting the amplified by a predetermined multiple, and amplifying in the amplifying unit 110. And comparison gate receives the amplified value to the inverted (-) terminal and the non-inverted (+) terminal as preset, and the AND gate for receiving the output value of the comparison unit 120 and performs the AND operation 130, an inverter 140 that receives and outputs the output value of the AND gate 130, a D flip-flop 150 that receives and latches the output value of the inverter 140, and the AND gate. The first to eighth sensing units 101 to 108 are inputted by receiving the output value of 130. The microcomputer 160 detects whether external light is input through the microcomputer 160 and controls auto-convergence execution or return to the factory shipment state according to whether the external light input is detected, and a message according to the external light input according to the control signal of the microcomputer 160. Warning message output unit 170 for outputting.

The amplifier 110 receives the first sensed value detected through the second optical sensor B mounted on the first to fourth detectors 101 to 104 and amplifies the first amplifier 111a and the first. A first amplifier 111 comprising a second amplifier 111b for receiving and amplifying a sensed value detected through the optical sensor A, and the fifth to eighth detectors 105 to 108. 2 is detected through the first amplifier (A) mounted on the third amplifier 112a and the fifth to eighth detection units 105 to 108 to receive and amplify the detection value detected through the second optical sensor (B). The second amplifier 112 includes a fourth amplifier 112b for receiving and amplifying the detected value.

The comparison unit 120 receives an output value of the first amplifier 111a of the first amplifier 111 as an inverting (−) terminal and receives an output value of the second amplifier 111b as a non-inverting (+) terminal. The output value of the first comparator 121 and the third amplifier 112a of the second amplifier 112 is input to the inverting (−) terminal, and the output value of the fourth amplifier 112b is received. A second comparator 122 is input to the non-inverting (+) terminal and compared.

Referring to the operation of the automatic convergence adjustment device of the projection TV according to the present invention configured as described above are as follows.

When the user selects the auto-convergence function in the projection TV, before the auto-convergence function is executed, the detection value detected by the second optical sensor B mounted in the first to fourth sensing units 101 to 104 is measured. The sensing value input to the first amplifier 111a and sensed through the first optical sensor A sensed by the first to fourth sensing units 101 to 104 is input to the second amplifier 111b. The amplification degree of the first amplifier 111a is amplified to be twice the amplification degree of the second amplifier 111b.

Similarly, the detection value detected through the second optical sensor B mounted on the fifth to eighth sensing units 105 to 108 is input to the third amplifier 112a, and the fifth to eighth. The detected value detected through the first optical sensor A mounted in the sensing units 105 to 108 is input to the fourth amplifier 112b and amplified, and the fourth amplified by the third amplifier 112a. Amplification is performed so as to double the amplification degree of the amplifier 112b.

In this way, the signals amplified through the first and second amplifiers 111a and 111b are input to the first comparator 121 and compared, and amplified by the third and fourth amplifiers 112a and 112b. The received signal is input to the second comparator 122 and compared, and the outputs of the first and second comparators 121 and 122 perform an AND operation through the AND gate 130, and then, The microcomputer 160 is input to determine whether external light is input.

In this case, in order to execute auto convergence, a measurement pattern is generated and moved from the top to the bottom of the screen 100 or from the left to the right to the detected values detected by the first to eighth detectors 101 to 108. The degree of convergence is determined.

In this case, the method of moving the pattern at the time of executing the auto convergence will be described with reference to FIG. 2 mentioned in the related art.

In other words, when the measurement pattern is at the first setting position t1, the first optical sensor A and the second optical sensor B do not overlap with each other. Therefore, since no light is detected, a low signal is output from both the first and second amplifiers 111a and 111b of the first amplifier 111 and the first and second amplifiers 111a ( At 111b, a low signal is input to the first comparator 121. However, since some pull-up resistors are connected to the non-inverting (+) terminal of the first comparator 121, the output of the first comparator 121 becomes a high signal.

Next, when the pattern comes to the second setting position t2, the first optical sensor A overlaps about 1/2 of the pattern, and the second optical sensor B does not overlap the pattern. It is detected only by the light sensor (A). In this case, since the current value input to the non-inverting (+) terminal of the first comparator 121 is large, the first comparator 121 outputs a high signal.

Next, when the pattern reaches the third set position t3, the first optical sensor A overlaps the pattern, and the second optical sensor B overlaps about 1/2. Since the amplification degree of the amplifier 111a is twice the amplification degree of the second amplifier 111b, the output values of the first and second amplifiers 111a and 111b are the same. Therefore, since the same value is input through the inverting (-) and the non-inverting (+) of the first comparator 121, the output of the first comparator 121 outputs a low signal.

As described above, when the pattern for auto-convergence is moved from the upper side to the lower side of the screen 100, the third sensing unit is also provided through the seventh sensing unit 107 mounted on the screen 100. Since the same value as the value detected through 103 is detected, the same value will be output from the second comparator 122.

Therefore, when both outputs of the first comparator 121 and the second comparator 122 are output low signals, the AND gate 130 performs an AND operation to output a low signal. Low signal is inverted while passing through the inverter 140 and input to the microcomputer 160 as a high signal.

Since the microcomputer 160 is at the third setting position t3 when the pattern at the point of time when the input becomes high from the low signal is high, the microcomputer 160 can be moved from the initial position of the pattern to the third setting position t3. The distance is measured to determine how much convergence is corrected.

Therefore, the microcomputer 160 recognizes a low signal before the pattern passes through the third setting position t3. However, when external light such as external illumination or light is inputted, since the first and second optical sensors A and B are all affected by light, the position of the pattern is positioned at the fourth setting position t4. Will produce the same output as it does.

Accordingly, the apparatus for adjusting auto-convergence of the projection TV according to the present invention receives the output of the AND gate 130 that AND-operates the outputs of the first comparator 121 and the second comparator 122 before the auto-convergence execution. By determining whether the external light is input, it is first checked whether the output of the AND gate 130 is a high signal, and if it is not the high signal, it is determined that external light is coming in. In addition, when a small amount of external light is input (the minimum amount of external light to detect the presence or absence of external light), the output of the AND gate 130 alternately outputs high and low in a clock form. Since the signal is input to the microcomputer 160, when the external light is checked, the output of the AND gate 130 is low, and it is not assumed that external light is not input, and it is also necessary to check whether the oscillation is performed.

In addition, according to the control signal of the microcomputer 160 outputs a warning message according to the external light input through the warning message output unit 170.

Referring to FIG. 5, the method for adjusting the auto convergence of the projection TV according to the present invention is first determined whether the user has selected auto convergence (S11).

Subsequently, when the user selects auto convergence, the determination result (S11) determines whether external light is input (S12).

Subsequently, if the external light is not inputted as a result of the determination (S12), auto convergence is executed (S13).

Then, while executing auto convergence, it is determined whether there is an abnormality in the detection value by receiving the detection values from a plurality of detection units mounted in the predetermined area of the screen (S 14).

Subsequently, if there is no abnormality in the detected result (S14), the auto convergence correction is executed based on the detected value (S15).

On the other hand, if there is an abnormality in the detection result (S15), the detection value is returned to the factory shipment state (S16).

Then, it is determined whether the external light is input again for the second execution (S17).

Subsequently, when external light is input, the result of the determination (S17) is returned to the following steps (S22 to S23).

On the other hand, if the determination result (S17), the external light is not input, the second auto convergence is executed (S18).

When the auto convergence is executed, it is determined whether or not there is an abnormality in the detection values detected through the plurality of detection units (S19).

Subsequently, when there is an abnormality in the detected value (S19), the detected value is returned to the factory shipment state (S21).

On the other hand, if there is no abnormality in the detection result (S19), the detection of the automatic convergence based on the detected detection value (S20).

As a result of the determination (S12), if the external light is inputted, it returns to the factory shipment state and displays an OSD for informing the user whether the external light is inputted (S22 to S23).

As described above, the automatic convergence adjustment method of the projection TV according to the present invention first checks whether the external light is turned on when the user executes the auto convergence, and if it is determined that the external light has entered, the convergence adjustment value is returned to the factory default state. The OSD is displayed to notify the user that external light has been entered.

Here, the phrase displayed through the OSD is "dim the ambient light and adjust again." You can display phrases such as

In addition, if it is determined that no external light is input, auto-convergence is executed to obtain a detection value from each detection unit, and it is determined whether the detection value is abnormal, and if no abnormality is found in the detection value, auto-convergence correction is performed by the detection value. Is carried out. If an abnormality is detected in the detected value, the convergence is returned to the factory shipment state without correcting the convergence.

As described above, the apparatus and method for auto-convergence adjustment of the projection TV according to the present invention have the following effects.

First, it is possible to prevent auto convergence from being executed due to an erroneous detection value by determining whether auto convergence is executed by determining whether external light is input before auto convergence execution.

Second, when the external light input is input to the user whether the external light input or not can improve the degree of adjustment of the auto convergence.

Third, as the adjustment degree of auto convergence is improved, a clear image of high quality can be seen.

Claims (6)

In the projection TV having a first to eighth sensing unit having a screen for displaying an image signal, and the first and second optical sensors for detecting a pattern mounted on a predetermined area of the screen and displayed on the screen, An amplifying unit configured to receive a sensed value detected through the first to fourth sensing units and the fifth to eighth sensing units, respectively, and amplify the predetermined value by a predetermined multiple; A comparison unit for receiving and comparing a value amplified by the amplification unit; An AND gate for ANDing the output value of the comparator; And, The input of the output value of the AND gate determines the degree of external light input to determine whether or not to execute the auto convergence and factory adjustment mode, and comprises a microcomputer for telling the user whether or not the external light input, the projection TV auto Convergence Control. The method of claim 1, The microcomputer determines the amount of external light input light depending on whether a low signal or a high / low signal is repeatedly input to the output value of the AND gate. Convergence Control. The method of claim 1, And a warning message output unit for outputting a warning message according to external light input according to the control signal of the microcomputer. In the auto-convergence adjustment method of the projection TV having a screen and a plurality of detection unit mounted at a predetermined position of the screen for detecting the degree of convergence, Detecting an external light input when the user selects the auto convergence mode; If the external light input is detected, returning to an initial state and outputting a message according to the external light input to a user; Executing auto convergence if the external light input is not detected; And, And determining whether to return to an initial state according to whether there is an abnormality in the detection value when the detection value is input from the plurality of detection units when the auto convergence is executed. The method of claim 4, wherein Detecting the external light input And determining the input degree of external light according to whether one of the high, low, and pulse (high and low coexistence) signals is input to the sensed values detected by the plurality of detection units. How to adjust the auto convergence of a projection TV. The method of claim 4, wherein The step of outputting the message according to the external light input Auto-convergence adjustment method of the projection TV, characterized in that the step of outputting a message of the OSD type.