KR20080108945A - Compensation device for non-uniform regions in flat panel display and method thereof - Google Patents

Abstract

A device for compensating non-uniform region in a flat panel display and a driving method thereof are provided to compensate for a non-uniform region by using the digital processing. A data base(15) stores position information of non-uniform regions obtained by a test result. A non-uniform region determining unit(21) determines whether a video signal is a non-uniform region pixel or a normal region pixel according to position information of non-uniform regions of a data base. A digital non-uniform processing circuit includes a non-uniform region compensating unit. In the digital non-uniform region processing circuit, a non-uniform region compensating unit(23) compensates for the video signal properly through the digital processing according to the determination result of the non-uniform region determining unit.

Description

Non-uniform Area Compensation Apparatus and Its Compensation Method in Flat Panel Display {COMPENSATION DEVICE FOR NON-UNIFORM REGIONS IN FLAT PANEL DISPLAY AND METHOD THEREOF}

1 is a functional block diagram according to an embodiment of the present invention.

2 is a functional block diagram of a processing circuit 10 for non-uniform regions in accordance with an embodiment of the present invention.

3 is an operation chart for reconstructing a video signal with the video decoder 31 according to an embodiment of the present invention.

4 is a graph relating to mapping of an algorithm.

5A is a diagram illustrating region division of non-uniform regions according to an embodiment of the present invention.

5B is a distribution diagram of non-uniform regions according to an embodiment of the present invention.

6A is a curve diagram of a dynamic operation in accordance with an embodiment of the present invention.

6B is another curved diagram of a dynamic operation in accordance with this embodiment of the present invention.

6C is a curve diagram of a dynamic operation in accordance with another embodiment of the present invention.

7 is another curved diagram of a dynamic operation in accordance with another embodiment of the present invention.

8 is a functional block diagram of a compensation device for one-dimensional non-uniform regions according to an embodiment of the present invention.

9 is a functional block diagram of a compensation device for two-dimensional non-uniform regions according to an embodiment of the present invention.

10A is a general functional block diagram of a display applied to an organic light emitting diode (OLED) backlight module plate.

FIG. 10B is a functional block diagram of a compensation device for non-uniform regions according to an embodiment of the present invention applied to the organic light emitting diode backlight module plate of FIG. 10A.

The present invention relates to a compensation device and a compensation method for non-uniform areas in a flat panel display. More specifically, the present invention relates to a compensation device for non-uniform areas in a flat panel display by digital signal processing and a method of manufacturing the same.

Various flat panel displays have been developed to address the drawbacks of conventional cathode ray tube (CRT) displays that are overweight or bulky. The flat panel displays may be classified into cathode ray tube displays, liquid crystal displays (LCDs), plasma displays, organic light emitting diode (OLED) displays, and the like. Each of the flat panel displays described above has unique advantages.

In the liquid crystal display, the manufacturing process of the liquid crystal display panel involves complex bonding or materials such as plates of the backlight module, polarizing films, brightness enhancing films, and two glass substrates bonded together. If a slight error occurs in one manufacturing step of the liquid crystal display, recognizable non-uniform areas will appear when the final light-on test is performed, and the error may be a bad pixel or It is a so-called mura phenomenon such as non-uniform gray scale or color. Also, varying degrees of recognizable non-uniform areas may appear after the light test if the light provided by the plates of the backlight module is not uniform.

Thus, the non-uniform areas are generally a low quality phenomenon caused, for example, in the non-uniformity in the plates of the backlight module and in the manufacturing processes of the display. The non-uniform regions or mura feature are, for example, gray scales / colors distorted in an uncertain shape. First, for the distorted gray scales / colors, the general non-uniform areas include, for example, white spots, dark spots, light areas and dark areas. The white and dark spots indicate that some pixels have a defect, and the bright and dark areas indicate that the pixels have defects in the regions. Next, the appearance of the non-uniform regions may be, for example, lateral stripes, or 45 ° stripes or straightly cut blocks that appear in one corner or scatter randomly in all regions. have.

The non-uniform areas that greatly affect the visual feeling are largely due to errors during manufacturing processes or assembly processes. To reduce the non-uniform areas, manufacturers generally improve the processes, for example by improving the material, thickness, etching, physical property / chemical property recipes, etc. The mura phenomenon is removed from (de-mura, mura-free fields). In addition, since the liquid crystal display panel is formed by the combination of two glass substrates, an error occurring in the combination of the glass substrates may cause uneven regions. Also, in another aspect, errors in the design, manufacture and assembly of the backlight module plate of the liquid crystal display may cause the non-uniform areas.

Therefore, paying attention to the causes of the non-uniform regions, it is possible to reduce the occurrence of the non-uniform regions by improving the manufacturing process. In addition, the causes of the non-uniform areas can be detected or distinguished by installing several automatic monitoring devices during the advanced process. However, the aforementioned improved method also has disadvantages. For example, process parameters must be changed to improve the processes, which results in more complex panel manufacturing processes. In addition, the manufacturing cost of the panel is greatly increased due to the installation of the monitoring device. US Published Patent 20040179028 proposes a process compensation method, which increases the manufacturing process or panel design costs. In addition, US Published Patent 20050007364 proposes a process inspection method, which greatly increases the complexity of the manufacturing process.

Therefore, in a de-mura, mura-free field, a technique for processing non-uniform areas in a panel through signal processing should be presented. Through this technique, the non-uniform areas in the panels are properly treated without changing the manufacturing process.

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus and method for compensating for non-uniform areas in a flat panel display by digital processing, which make it possible to eliminate non-uniform areas in a panel by means of a correction / compensation processing method. have.

Another object of the invention is applied to liquid crystal displays, plasma displays, organic light emitting diode displays, rear-projection displays, and the like, and may be applied to light emitting diode (LED) plates of backlight modules that control direct compensation. The present invention provides a device and method for compensating for an uneven area in a flat panel display.

It is another object of the present invention to provide an apparatus for compensating for non-uniform areas in a flat panel display by digital processing, because the non-uniform areas are not processed using a material, an optical film or a manufacturing process, so that the manufacturing cost of the flat panel display does not increase. To provide that method.

In accordance with the above or other objects, the present invention provides a compensation device for non-uniform areas in a flat panel display to eliminate the negative effect of the non-uniform areas in a panel displaying a video signal. The apparatus for compensating for the non-uniform regions includes a digital non-uniform region processing circuit, and the digital non-uniform region processing circuit further includes a non-uniform region compensation unit. According to the test result of the non-uniform regions in the panel, the non-uniform region compensation unit properly compensates for the video signal through digital processing. As a result, the video signal is processed based on the test result, and the uneven areas do not adversely affect the video signal displayed on the panel. The processing structure for the non-uniform regions is achieved by digital compensation rather than by material, optical films or manufacturing processes.

According to the compensation method for the non-uniformity region disclosed in the preferred embodiment, the digital compensation may be performed by a mathematical calculation unit, a logic calculation unit, a direct mapping unit, a dynamic calculation unit or a combination thereof.

In accordance with the foregoing paragraphs or other objects, the present invention provides a method for compensating for non-uniform areas suitable for processing a panel having non-uniform areas. The method may further include determining, according to a test result of the panel, whether the video signal corresponds to a normal region pixel or a non-uniform region pixel, and if the video signal corresponds to a non-uniform region pixel. Compensating for the video signal through processing. The video signal is compensated by digital compensation rather than by material, optical films or manufacturing processes. As a result, the non-uniform areas in the panel can be compensated without complicated manufacturing process or increased manufacturing cost.

According to the compensation method for the non-uniformity region disclosed in the preferred embodiment, the digital compensation may be performed by a mathematical calculation unit, a logic calculation unit, a direct mapping unit, a dynamic calculation unit or a combination thereof.

BRIEF DESCRIPTION OF THE DRAWINGS In order that the above-mentioned objects and other objects, features and advantages of the present invention can be understood, preferred embodiments are described below in conjunction with the drawings.

The present invention solves the problem of non-uniform areas in the panel by digital compensation. As shown in the following embodiments, video signals displayed in non-uniform regions are compensated by digital compensation, such as mathematical operations, logical operations, direct mapping, dynamic operations, or a combination thereof. Even if new types of non-uniform regions appear in the future, these new non-uniform regions may also be addressed by updating the aforementioned processes or adding other digital compensation processes. In a field without demura or mura, the present invention provides digital compensation and handles defective panels, such as liquid crystal display panels or light emitting diode backlight module plates, to improve quality and reduce costs.

1 is a functional block diagram of processing a non-uniform area in accordance with an embodiment of the present invention. The database 15 for the non-uniform regions is made in advance for the panel of the embodiment of the present invention. That is, after a light-on test for the panel is performed, location information / type information / variation amount information and other related information about non-uniform areas in the panel are identified and non-uniform areas Is stored in the database 15 for. As is known, a pixel is the smallest display unit in a panel. In the following description, a pixel corresponding to a non-uniform area is referred to as a non-uniform area pixel, and a pixel corresponding to a normal area is referred to as a normal area pixel. Thus, the positional information of the database 15 includes the positions of all non-uniform region pixels. In addition, as described above, the non-uniform areas may be divided into at least white spots, dark spots, bright areas, dark areas, and the like. Since the compensation method for each type of non-uniform areas is not the same, the type information should be obtained in addition to the location information when the non-uniform areas are detected, thereby performing an optimal compensation according to each type of non-uniform areas. Furthermore, the database 15 may record a correction / compensation method of each of the non-uniform areas, thereby facilitating the processing of the processing circuit 10 for the non-uniform areas.

After receiving the video input signal, the processing circuitry 10 for the non-uniform regions may determine whether non-uniform region processing (compensation) is to be performed on the video input signal, and the non-uniform regions extracted from the database 15. The method determines whether to perform the non-uniform area processing according to the position information / type information / change amount information. Finally, the processed video signal or a video signal that does not need to be processed is output to a post-circuit (not shown). The video input signal includes at least position information of the pixel indicating the position at which the image is displayed, and the gray scale / color information indicating the brightness / color of the image.

2 is a functional block diagram of a non-uniform region processing circuit according to an embodiment of the present invention. As shown in FIG. 2, the processing circuit 10 for non-uniform regions includes a determination unit 21 for non-uniform regions, a type switch unit 22 for non-uniform regions, a compensation unit for non-uniform regions ( 23), delay / bypass unit 24 and path switch unit 25.

The determining unit 21 for the non-uniform regions according to the positional information about the non-uniform regions transmitted from the database 15 for the non-uniform regions, whether the received video input signal corresponds to a normal region pixel or non-uniform It is determined whether it corresponds to an area pixel. That is, the determination unit 21 for the non-uniform regions compares the position information of the pixel of the video input signal with the position information of the non-uniform regions in the database 15. If the two comparison information match, the video input signal is determined to correspond to the non-uniform area pixels, otherwise it is determined to correspond to the normal area pixels. Then, the determination unit 21 for the non-uniform regions is a type switch for the non-uniform regions with the type information M_type conveyed from the database 15 and the video input signal determined to correspond to the non-uniform region pixels. Transmit to the unit 22.

According to the type information M_type, the type switch unit 22 for the non-uniform regions is adapted to calculate the video input signal determined to correspond to the non-uniform region pixels within the compensation unit 23 for the non-uniform regions. Transfer / switch to the unit.

The compensation unit 23 for the non-uniform regions may include a mathematical operation unit 231, a logic operation unit 232, a direct mapping unit 233, and a dynamic operation unit 234. Math operation unit 231 adds, subtracts, multiplications to the video input signal (the gray scale / color information) transmitted from the type switch unit 22 for the non-uniform regions. Perform mathematical operations such as / division and biased-offset. Logic operation unit 232 performs logical operations such as logical product (AND), logical sum (OR), and exclusive logical sum (XOR) on the video input information (grey scale / color information). The direct mapping unit 233 performs mapping such as a look-up table (LUT) method on the video input signal (gray scale / color information). For example, when a bright area appears on the panel, the gray scale / color signal of the non-uniform area pixel may be adjusted or reduced using the LUT method to achieve an effect of compensating the non-uniform areas. Dynamic calculation unit 234 assigns different weighting values to the video input signals based on position or gray scale to perform the compensation described above. In the present invention, the digital compensation may be performed by the mathematical operation unit 231, the logical operation unit 232, the direct mapping unit 233 and the dynamic operation unit 234, and combinations thereof. In addition, other digital computing units may be employed in the compensation unit 23 for the non-uniform regions according to the demand for processing other types of non-uniform regions or non-uniform regions of new digital processing units, thereby an embodiment of the present invention. Has extensibility.

As shown in the embodiments of the present invention, the present invention reduces defective panels, handles non-uniform areas, and provides advanced digital compensation techniques in the Demura and Mura free fields.

Under special circumstances, a particular video input signal may be input simultaneously to two or more units 231-234 so that more appropriate compensation may be performed. The compensation unit 23 for the non-uniform areas inputs the compensated video signal to the path switch unit 25. The path switch unit 25 is used to allow the continuous video signals output from the processing circuit 10 for the non-uniform regions to be corrected. This means that when a plurality of video input signals are continuously input to the processing circuit 10 for non-uniform regions, the processed video signals also have an original sequence so that a distorted video frame does not occur. Because it must be output from the processing circuits 10 for the non-uniform regions.

If the determination unit 21 for the non-uniform regions determines that the video signal corresponds to a normal region pixel, the video signal (corresponding to the normal region pixel) may be input to the delay / bypass unit 24. If necessary, the delay / bypass unit 24 includes a register for registering the video signal corresponding to the normal area pixel. The reason for registering the video signal corresponding to the normal area pixel is as follows. If it is determined that a video signal (or some video signals) corresponds to the non-uniform area pixel, the non-uniform area compensation unit takes some time to process the video signal, in between The video signal is input to the processing circuit 10.

If the subsequent video signal is determined to correspond to the normal region, the video signal must be registered (delayed) in the delay / bypass unit 24, the video signal corresponding to the first non-uniform region pixel is compensated, and the path switch It cannot be output until it is delivered after being delivered to the unit 25. Under some circumstances, the video signal corresponding to the normal area pixel may be transmitted to the path switch unit 25 without being registered / delayed.

The path switch unit 25 is controlled by the control signal CTL output from the determination unit 21 for the nonuniform regions. The control signal CTL specifies at least normal or mura for controlling a series of consecutive input video signals. According to the control signal CTL, the path switch unit 25 may output the corrected / compensated video signal output by the compensation unit 23 for the non-uniform areas as a video output signal. Whether or not to output an uncompensated video signal by the delay / bypass unit 24.

Some embodiments below are intended to clearly explain the principle of operation of the processing circuit 23 for non-uniform regions. Referring to FIG. 3, FIG. 3 is an operational chart for decompressing video signals with the video decoder 31 in accordance with an embodiment of the present invention. 2 and 3, the video signal is input to the video decoder 31. The video decoder 31 decodes the video signal into a video input signal containing position information and uses a determination unit 21 for non-uniform regions to determine whether a portion of the video input signal corresponds to the non-uniform region. Determine. In the panel of FIG. 3, the non-uniformity region 1 NUR1 is defined by the boundaries of the horizontal start 1 H_start1, the horizontal end 1 H_end1, the vertical start 1 V_start1 and the vertical end 1 V_end1, and is non-uniform. Region 2 NUR2 is defined by the boundaries of horizontal start 2 H_start2, horizontal end 2 H_end2, vertical start 2 V_start2 and vertical end 2 V_end2. If a portion of the video signal is determined to correspond to the non-uniform area 1 or 2, digital processing for the video signal will proceed.

The algorithm used by the determining unit 21 for the non-uniform regions is as follows.

IF x∈given [H_start1, H_end1] AND y∈given [V_start1, V_end1],

THEN pixel_ (x, y) ∈NUR1; or IF (x, y) ∈

given BitMAP / Contour / Boundary of NUR1,

THEN pixel_ (x, y) ∈ NUR1; Similar for NUR2

The first line of the algorithm indicates that the horizontal coordinate x corresponds to the area defined by the horizontal start 1 (H_start1) and the horizontal end 1 (H_end1), and the second line indicates that the vertical coordinate (y) is the vertical start1. It corresponds to the area defined by V_start1 and V_end1, whereby the third line determines that the video input signal corresponds to the non-uniform area 1 (NUR1). Alternatively, by another determination method, the video input signal is determined according to the bitmap, contour, and boundary of the non-uniformity region 1 NUR1. The bitmap is an uneven region that includes the boundaries and the interior thereof. The contour is just a non-uniform area that includes the boundaries. After the type of the non-uniform block is determined, the determining unit 21 for the non-uniform regions performs subsequent compensation with respect to the characteristics of the block. The last line indicates that the determination is performed in the same way for non-uniform region 2 (NUR2).

Another algorithm used by the determining unit 21 for the non-uniform regions is as follows.

IF pixel_ (x, y) ∈NUR1, THEN NUR_TYPE = TYPE1;

e.g., TYPE 1 means white-spot, dark-spot ...

similar for TYPE2

The first line of the algorithm says that if the pixel at position (x, y) belongs to non-uniformity region 1 (NUR1), then the parameter NUR_TYPE of the non-uniformity region is for storage types such as white spot and dark spot. By setting to TYPE1, it is determined whether or not the video input signal corresponds to an uneven area of a white point or a dark point. Similar for other types.

Referring to FIG. 2, a mathematical operation unit 231 is used to perform a compensation, and an algorithm using a mathematical operation to perform the compensation is as follows.

[RGB] = MATHFun ([RGB], [dR, dG, dB])

= [RGB] + [dR dG dB]; or

= [RGB]-[dR dG dB]; or

= [RGB] + gain * [dR dG dB]; or

= [RGB] -gain * [dR dG dB] + offset; ...

The first line of the algorithm sets the video output signal [RGB] to an equation (video input signal [RGB], compensation value [dR, dG, dB]), and the equation is based on each non-uniformity region. Perform the compensation mode from the first line to the fifth line. Lines 2 through 5 indicate the addition of various compensation values [dR, dG, dB] to the video output signal [RGB]. For example, to perform compensation in the second row, the compensation value [dR, dG, dB] without any gains is added to the video input signal [RGB]. In order to perform the compensation in the third row, the compensation value [dR, dG, dB] without any gains is subtracted from the video input signal [RGB]. In the fourth row gains are employed to adjust the compensation value [dR, dG, dB] and added to the video input signals [R, G, B]. In addition, in the fifth row, an offset value is further added to the video input signal [RGB] in addition to employing gains to adjust the compensation value [dR, dG, dB]. Those skilled in the art to which the present invention pertains are not limited to the algorithm described above, but the compensation method of the mathematical calculation unit 231 can be adjusted by other mathematical expressions designed according to various non-uniform areas. You will understand.

The logical operation unit 232 is used to perform the compensation, and the algorithm using the logical operation for the compensation is as follows.

[RGB] = LogFun ([RGB], [dR dG dB])

= [RGB] AND [dR dG dB]; or

= [RGB] OR [dR dG dB]; or

= [RGB] XOR [dR dG dB]; ...

The first line of the algorithm sets the video output signal [RGB] to a logic expression (video input signal [RGB], compensation value [dR, dG, dB]), and the logic expression is based on each non-uniformity region. Perform the compensation mode from the line to the fourth line. From the second row to the fourth row, various compensation values [dR, dG, dB] are added to the video output signal [RGB]. For example, in the second line, the video input signal [RGB] controls and compensates the compensation value [dR, dG, dB] by using a logical AND (AND), and in the third line, the video input signal [RGB] uses the OR to control the compensation value [dR, dG, dB] and performs compensation. In the fourth line, the video input signal [RGB] uses an exclusive OR (XOR). The compensation value [dR, dG, dB] is controlled and compensation is performed. Those skilled in the art to which the present invention pertains are not limited to the algorithm described above, and the compensation method of the logical operation unit 232 can be adjusted by other logical expressions designed according to various non-uniform areas. You will understand.

The direct mapping unit 233 is used to perform the compensation, and the algorithm using the direct mapping operation for the compensation is as follows.

[RGB] = MapFun ([RGB], [dR dG dB])

= curves decided by LUT

Referring to FIG. 4, FIG. 4 is a graph relating to mapping of the algorithm. The horizontal axis represents pixel luminance before mapping, and the vertical axis represents pixel luminance after mapping. The first line of the algorithm sets the video output signal [RGB] to a mapping equation (video input signal [RGB], compensation value [dR, dG, dB]), and the compensation is performed by mapping curves 401, 402 and 403. Each is performed. The mapping curves 401, 402, 403 are determined by a lookup table (LUT). Where different color ranges (such as dR and R are mapped, dG and G are mapped, dB and B are mapped, or dR and G are mapped, dG and B are mapped, and dB and R are mapped) gamut) can be mapped to each other. Those skilled in the art to which the present invention pertains understand that the method of compensating the direct mapping unit 233 is not limited to the above algorithm, but can be adjusted by other mapping curves designed according to various non-uniform regions. I can understand.

As shown in the embodiments of the present invention, the defective panels in the present invention are compensated by gains, offsets, lookup tables (LUTs) and logic operations rather than by materials, optical films and manufacturing processes. Can be.

In the dynamic arithmetic unit 234, the difference between the dynamic arithmetic unit 234 and the mathematical arithmetic unit 231, the logical arithmetic unit 232, and the direct mapping unit 233 described above is that the dynamic arithmetic unit 234 is progressive. Compensation is performed in a progressive way, using position or gray scale brightness and adjusting the weighting value for the compensation. 5A is an area division diagram of the non-uniform regions according to an embodiment of the present invention. Straight lines LV1-LV6 having different slopes mark out the non-uniform regions. 5B is a distribution diagram of the non-uniform regions according to the embodiment of the present invention. Referring to FIGS. 5A and 5B, the outer contour 1 C1 includes the region 1 R1 and the region 2 R2, the inner contour 2 C2 includes the region 2 R2, and the region 1 ( R1) is disposed between outer contour 1 C1 and inner contour 2 C2.

An algorithm employing position dynamic calculation to perform the compensation is as follows.

[R`G`B`] = SpaceFadingFun ([R G B], [dR dG dB], SpaceWeighting (·))

e.g.,

[R`G`B`] _A = [R G B] _A + [dR dG dB] _A * SpaceFadingWeighting (R_A);

e.g.,

[Y`U`V`] _A = [Y U V] _A + [dY dU dV] _A * SpaceFadingWeighting (R_A);

Where R_A: distance of A point to NUR central point similarly, for YUV, YCbCr ...

The first line of the algorithm converts the video output signal [R'G'B '] into a position dynamic calculation equation (video input signal [RGB], compensation value [dR, dG, dB] * position adjustment weight (·)). And the compensation performs a dynamic operation of the algorithm according to the contour and boundary of the non-uniformity region NUR. The video output signal [R`G`B`] _A is set to a value obtained by adding the video input signal [RGB] _A to the position adjustment weight SpaceFadingWeighting (R_A) times the compensation value [dR dG dB] _A. . Similarly, the video output signal [Y`U`V`] _A is obtained by multiplying the position adjustment weight value (SpaceFadingWeighting (YUV_A)) by the compensation value [dY dU dV] _A plus the video input signal [YUV] _A. Is set. Here, R_A is a distance from the compensation point to the center of the non-uniform area. Referring to the algorithm, FIGS. 5B and 6A, FIG. 6A is a curve diagram of dynamic operation in accordance with an embodiment of the present invention. The horizontal axis represents position, the vertical axis represents weight, and different weights of various pixels are adjusted by curves 601-604 according to the position between inner contour 1 (C1) and outer contour 2 (C2). . For example, the center point S1 has a weight of 1, and in such a gradual way a more natural visual compensation effect can be achieved by the curves 601-604. Those skilled in the art to which the present invention pertains are not limited to the dynamic calculation curves, but the compensation method of the dynamic calculation unit 234 is controlled by other position dynamic calculation curves designed according to various non-uniform regions. It can be understood. 6B is another curved diagram of a dynamic operation in accordance with this embodiment of the present invention. The horizontal axis represents position, the vertical axis represents weight, and different weights of various pixels are adjusted by curves 605-608 according to the position between inner contour 1 (C1) and outer contour 2 (C2). do. Furthermore, referring to FIG. 6C, FIG. 6C is a curve diagram of dynamic operation in accordance with another embodiment of the present invention. Here, the horizontal axis represents a position, and the vertical axis represents a weight. The difference between FIGS. 6A and 6C is that, in FIG. 6C, six sections B1-B6 are located between the inner contour 1 C1 and the outer contour 2 C2 for performing the compensation, that is, the width of each interval, that is, The spatial delay / shift is 2 ⁿ .

The weight according to the embodiment of the present invention is gradually reduced from the center point to the edge. On the other hand, those having ordinary knowledge in the field of the present invention are not limited to the weight of the present invention is gradually reduced from the normal region to the non-uniform region, and may be gradually increased from the normal region to the non-uniform region. I can understand. In addition, the compensation can be performed from a single side or a double side.

Another algorithm that employs position gray scale dynamic operations to perform the compensation is as follows.

[RGB] = GrayFadingFun ([RGB], [dR dG dB],

GrayWeighting (·));

e.g.,

[R`G`B`] _A = [RGB] _A + [dR dG dB] _A *

GrayWeighting ([RGB] _A);

e.g.,

[Y`U`V`] _A = [YUV] _A + [dY dU dV] _A *

GrayWeighting ([YUV] _A);

Where Gray Weight ([RGB]): weighting depends on [RGB] grays; Similarly, for YUV, YCbCr

The first line of the algorithm sets the video output signal [R'G'B '] to the gray scale dynamic calculation equation (video input signal [RGB], compensation value [dR dG dB] * gray scale weight (·)). The compensation performs dynamic calculation of the algorithm according to the gray scale value of the video input signal RGB. The video output signal [R`G`B`] _A is set to a value obtained by multiplying the gray scale weight GrayWeighting (R_A) by the compensation value [dR dG dB] _A and adding the video input signal [RGB] _A. . Similarly, the video output signal [Y`U`V`] _A is obtained by multiplying the gray scale weight (GrayWeighting (R_A)) by the compensation value [dY dU dV] _A and adding the video input signal [YUV] _A. Is set. Here, the gray scale weight (GrayWeighting (R_A)) of the RGB signal is determined by the gray scale distribution of the RGB, which is also the same for the signals YUV and YCbCr. 7 together, FIG. 7 is a curve diagram of a dynamic operation according to another embodiment of the present invention. Here, the horizontal axis represents a gray scale value of RGB, and the vertical axis represents a weight. In the algorithm, curves 701-704 are used to perform dynamic compensation, and different compensations are performed on each side of center point S2. One of ordinary skill in the art will understand that the compensation method of the dynamic calculation unit 234 is not limited to the dynamic calculation curves, but may be defined by other gray scale dynamic calculation curves designed according to various non-uniform regions. It will be appreciated that it can be adjusted. On the other hand, those skilled in the art to which the present invention pertains are not limited to the scale up according to the gray scale value, but the scale down according to the gray scale value. It will be appreciated.

8 is a functional block diagram of a compensation device for one-dimensional non-uniform regions according to an embodiment of the present invention. The compensation device for the one-dimensional non-uniform regions includes a determination unit 81 for non-uniform regions, a type switch unit 82 for non-uniform regions, a compensation unit 83 for non-uniform regions, and a delay / bypass unit ( 84, a path switch unit 85, a database 86 for non-uniform regions, an input line buffer 87, an output line buffer 88, a pixel counter 89, and a delay unit D1. Input line buffer 87 receives the data and sends the data to type switch unit 82 and delay / bypass unit 84 for non-uniform regions. The data of the pixel counter 89 and the database 86 for the non-uniform regions are passed to the determination unit 81 for the non-uniform regions in order to receive the type determination for the non-uniform regions, and to receive further decisions. It is input to the type switch unit 82 for the non-uniform regions, and then to the compensation unit 83 for the non-uniform regions.

The compensation unit 83 for the non-uniform regions is the first compensation unit 831, the second compensation unit 832, the third compensation unit 833, the fourth compensation unit 834, and the fifth compensation unit 835. And a multiplexer 836. Compensation units 831-833 perform compensation using only one method. The method is selected, for example, among logical operations, mathematical operations, direct mapping and dynamic operations. Compensation units 834, 835 perform compensation using various methods. The method can be, for example, any combination from logical operations, mathematical operations, direct mapping, and dynamic operations. The compensation units 831-835 then input the compensated signal to the multiplexer 836, and the data of the multiplexer 836 and the delay / bypass unit 84 together are input to the path switch unit 85. It is then output by the output line buffer 88. In addition, the compensation device for the one-dimensional non-uniform areas are characterized by low cost but high complexity.

9 is a functional block diagram of a compensation device for two-dimensional non-uniform regions according to an embodiment of the present invention. The compensation device for the two-dimensional non-uniform regions includes a processing circuit 93, a DRAM (DRAM) 96, an input line buffer 97 and an output line buffer 98 for the non-uniform regions. The data of the input line buffer 97 is input to the output line buffer 98 following the processing circuit 93 for the non-uniform regions. The processing circuit 93 for the non-uniform regions includes a limiting processor 931, a computing unit 932, a data processor 933 and a gray scale adjuster 934, the limiting processor 931 being the magnitude of the video signal. Used to limit Data for the non-uniform areas and the change amount information are stored in the DRAM 96 in advance, and the calculation unit 932 may perform, for example, a logical operation and a mathematical operation. The data processor 933 receives data from the DRAM 96 to perform decoding / decompressing, and inputs the data to the gray scale controller 934. Then, according to the magnitude of the video signal, the gray scale adjuster 934 performs gray scale fading of different weights with respect to variation amount information of non-uniform regions stored in the DRAM 96. . The video signal is then input to arithmetic unit 932. Compared with the compensation device for the one-dimensional non-uniform areas, the compensation device for the two-dimensional non-uniform areas is characterized by low complexity but high cost.

In order to more clearly illustrate the difference between FIGS. 8 and 9, referring together to FIGS. 8 and 9, the essential elements in FIG. 8 are the database 86 for non-uniform regions, the determination for non-uniform regions. Unit 81 and compensation unit 83 for non-uniform regions, and the essential elements in FIG. 9 are database 96 for non-uniform regions and processing circuit 93 for non-uniform regions. In FIG. 8, the non-uniform area database is used for storing one-dimensional data, and the one-dimensional data must be extended to the two-dimensional space through the determination unit 81. In FIG. 9 a database 96 for non-uniform areas is used to store two-dimensional data, which compensate for the non-uniform areas in the panel through a point-to-point manner. Can be employed directly to perform.

10A is a functional block diagram of an embodiment of the present invention applied to a display of a typical organic light emitting diode (OLED) backlight module plate. The display includes a temperature sensor 1001, a color sensor 1002, a microprocessor 1003, an LED power supply driver 1004, an LED backlight module plate 1005, and an LCD panel 1006. Color sensor 1002 inputs the video signal to microprocessor 1003, which also receives the signal from temperature sensor 1001 to drive LED power supply driver 1004. The microprocessor 1003 includes a compensation device for non-uniform areas, the compensation device previously storing data for non-uniform areas for the LED backlight module plate 1005 and then compensating the video signal to supply an LED power supply. Input to driver 1004. Thus, the LED power supply driver 1004 can be used to drive the LED backlight module plate 1005. One of ordinary skill in the art can compensate for the video signal in advance by placing a compensation device for non-uniform regions on the path of the video signal, thereby adjusting the LED backlight module plate 1005. It will be appreciated that the image quality of the LCD panel 1006 can be improved while emitting light of a predetermined brightness or color.

FIG. 10B is a functional block diagram of a compensation device for non-uniform regions according to an embodiment of the present invention applied to the general organic light emitting diode backlight module plate of FIG. 10A. Processing circuit 1007 for non-uniform regions and database 1008 for non-uniform regions constitutes a compensation device for non-uniform regions. The video input signal is input to the LED power supply driver 1004 following processing circuit 1007 for non-uniform regions so that compensation can be performed. In the previous embodiment of the present invention, non-uniform areas of the LED backlight module plate are processed without material, optical films or manufacturing processes, thereby increasing the manufacturing cost and complexity of the LED backlight module plate. In addition, the present invention can be applied to cathode ray tube displays, liquid crystal displays, plasma displays, organic light emitting diode displays and rear projection displays, and provides a digital compensation device and a compensation method in a field without a demura or mura. can do.

Although the present invention has been disclosed by the above preferred embodiments, the present invention is not limited to the above disclosed embodiments. Those skilled in the art may make several modifications without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention should be in accordance with the claims.

According to the present invention, the digital processing can compensate for the non-uniform areas without increasing the cost.

Claims (64)

A non-uniform region compensation device used in a flat panel display to remove negative effects of non-uniform regions in a panel displaying a video signal, A database for storing location information of non-uniform areas obtained according to the test result; A non-uniform area determining unit that determines whether the video signal corresponds to a non-uniform area pixel or a normal area pixel according to the positional information of the non-uniform areas in the database; And And a non-uniform region processing circuit including a non-uniform region compensation unit, wherein the non-uniform region compensation unit in the digital non-uniform region processing circuit appropriately receives the video signal through digital processing in accordance with the determination result of the non-uniform region determination unit. Non-uniform area compensation device, characterized in that for compensating. The method of claim 1, The database stores the type information of the non-uniform regions obtained according to the test result, and the non-uniform region determination unit performs the determination according to the type information of the non-uniform regions, and the video signal corresponds to the non-uniform region pixel. And if determined, the non-uniform area determining unit further determines a non-uniform area type of the non-uniform area pixel. The method of claim 2, The digital non-uniform region processing circuit further comprises non-uniform region type switch units for switching the video signal determined to correspond to the non-uniform region pixel to the non-uniform region compensation unit according to the output non-uniform region type. Uneven area compensation device. The method of claim 3, wherein The digital non-uniform region processing circuit is a delay / bypass unit for receiving and delaying or bypassing the video signal transmitted from the non-uniform region determination circuit and determined to correspond to the non-uniform region pixels, and the delay / bypass unit. A path switch circuit for switching and outputting the video signal delivered from the unit and / or the compensated video signal delivered from the non-uniform region compensation unit, to ensure a display sequence of the video signal. A nonuniform area compensation device. The method of claim 1, And wherein the non-uniform region compensation unit comprises a mathematical operation unit, and the non-uniform region compensation unit performs compensation for the video signal through the mathematical operation unit. The method of claim 1, And wherein the non-uniform region compensation unit comprises a logic operation unit, and the non-uniform region compensation unit performs compensation for the video signal through the logic operation unit. The method of claim 1, The non-uniform region compensation unit includes a direct mapping unit, and the non-uniform region compensation unit performs compensation for the video signal through the direct mapping unit. The method of claim 1, And the non-uniform region compensation unit includes a dynamic operation unit for performing compensation for the video signal according to a weighting value of each pixel of the panel. The method of claim 8, And the weight of each pixel of the panel is a position function. The method of claim 8, And the weight of each pixel of the panel scales up from the normal region to the non-uniform region. The method of claim 8, And the weight of each pixel of the panel scales down from the normal region to the non-uniform region. The method of claim 8, And the weight of each pixel of the panel is a function of gray scale. The method of claim 8, And the weight of each pixel of the panel scales up with a gray scale value. The method of claim 8, And the weight of each pixel of the panel scales down according to a gray scale value. The method of claim 1, The non-uniform region compensation device compensates for the video signal through digital processing, and inputs the video signal to a light emitting diode (LED) power supply driver to control the LED backlight module plate. The method of claim 1, And said panel is a liquid crystal display (LCD) panel. The method of claim 1, And the panel is a light emitting diode plate of a backlight module. A non-uniform region compensation method used in a flat panel display to remove negative effects of non-uniform regions in a panel displaying a video signal, the method comprising: Determining whether the video signal corresponds to a normal region pixel or a non-uniform region pixel according to a test result of the panel including position information of non-uniform regions and type information of non-uniform regions; And If it is determined that the video signal corresponds to a non-uniform region pixel, compensating for the video signal through digital processing. The method of claim 18, And determining a non-uniform region type of the video signal corresponding to the non-uniform region pixel according to the type information of the non-uniform regions. The method of claim 19, And compensating for the video signal through digital processing in accordance with the non-uniform region type of the non-uniform region pixel. The method of claim 20, Delaying or bypassing the video signal determined to correspond to the non-uniformity region pixel; And And continuously switching and outputting the video signal and / or the compensated video signal determined to correspond to the non-uniform area pixel to secure a display sequence of the video signal. . The method of claim 18, And the compensating step performs a mathematical operation to compensate the video signal. The method of claim 18, And the compensating step performs a logic operation to compensate the video signal. The method of claim 18, The compensating step comprises performing direct mapping to compensate for the video signal. The method of claim 18, And the compensating step performs a dynamic operation to compensate the video signal according to a weighting value of each pixel of the panel. The method of claim 25, And wherein the dynamic calculation step includes determining a weight of each pixel of the panel according to a position of each pixel of the panel. The method of claim 25, And the weight of each pixel of the panel scales up from the normal region to the non-uniform region. The method of claim 25, And the weight of each pixel of the panel is scaled down from the normal region to the non-uniform region. The method of claim 25, And the weight of each pixel of the panel is a function of gray scale. The method of claim 25, And the weight of each pixel of the panel scales up with a gray scale value. The method of claim 25, And the weight of each pixel of the panel scales down according to a gray scale value. The method of claim 18, Compensating for the video signal through digital processing and inputting the video signal to a light emitting diode (LED) power supply driver to control the light emitting diode backlight module plate. The method of claim 18, And said panel is a liquid crystal display (LCD) panel. The method of claim 18, And the panel is a light emitting diode plate of a backlight module. A non-uniform region compensation device used in a flat panel display to remove negative effects of non-uniform regions in a panel displaying a video signal, A database for storing location information of non-uniform areas obtained according to the test result; And And a non-uniform area processing circuit including a non-uniform area compensation unit, wherein the non-uniform area compensation unit in the digital non-uniform area processing circuit receives the video signal through digital processing according to the position information of the non-uniform areas of the panel. Non-uniform area compensation device, characterized in that it is properly compensated. The method of claim 35, wherein And the non-uniform area compensation unit further comprises a data processor used to process the positional information of the non-uniform areas. The method of claim 35, wherein And the non-uniform region compensation unit further comprises a limiting processor used to limit the magnitude of the video signal. The method of claim 35, wherein And an input line buffer for receiving the video signal. The method of claim 35, wherein And an output line buffer for outputting the video signal. The method of claim 35, wherein The non-uniform area compensation device, characterized in that the database (DRAM). The method of claim 35, wherein And the database further stores variation amount information of the panel. 42. The method of claim 41 wherein The non-uniform region compensation unit further includes a gray scale fader, wherein the gray scale adjuster has different weighting values for the variation information of the non-uniform regions stored in the database according to the magnitude of the video signal. And non-uniform region compensation device for performing gray scale fading. The method of claim 35, wherein The non-uniform region compensation unit further includes a gray scale adjuster, wherein the gray scale adjuster performs gray scale adjustment of different weights on the variation information of non-uniform regions stored in the database according to the magnitude of the video signal. A nonuniform area compensation device. The method of claim 35, wherein And wherein the non-uniform region compensation unit comprises a mathematical operation unit, and the non-uniform region compensation unit performs compensation for the video signal through the mathematical operation unit. The method of claim 35, wherein And wherein the non-uniform region compensation unit comprises a logic operation unit, and the non-uniform region compensation unit performs compensation for the video signal through the logic operation unit. The method of claim 35, wherein The non-uniform region compensation unit includes a direct mapping unit, and the non-uniform region compensation unit performs compensation for the video signal through the direct mapping unit. The method of claim 35, wherein The non-uniform region compensation device compensates for the video signal through digital processing, and inputs the video signal to a light emitting diode (LED) power supply driver to control the LED backlight module plate. The method of claim 35, wherein And said panel is a liquid crystal display (LCD) panel. The method of claim 35, wherein And the panel is a light emitting diode plate of a backlight module. A non-uniform region compensation method used in a flat panel display to remove negative effects of non-uniform regions in a panel displaying a video signal, the method comprising: Determining whether the video signal corresponds to a normal region pixel or a non-uniform region pixel according to a test result of the panel including position information of non-uniform regions; And If it is determined that the video signal corresponds to a non-uniform region pixel, compensating for the video signal through digital processing. 51. The method of claim 50, And processing the positional information of the non-uniform regions using a data processor. 51. The method of claim 50, Limiting the magnitude of the video signal using a confinement processor. 51. The method of claim 50, And receiving the video signal using an input line buffer. 51. The method of claim 50, And outputting the video signal using an output line buffer. 51. The method of claim 50, And storing location information of the non-uniform regions using a database. The method of claim 55, The database is a non-uniform area compensation method, characterized in that the DRAM. 51. The method of claim 50, And storing variation amount information of the panel. 51. The method of claim 50, And compensating for the video signal using a gray scale fader that performs a gray scale fading operation. 51. The method of claim 50, And the compensating step performs a mathematical operation to compensate the video signal. 51. The method of claim 50, And the compensating step performs a logic operation to compensate the video signal. 51. The method of claim 50, The compensating step comprises performing direct mapping to compensate for the video signal. 51. The method of claim 50, Compensating for the video signal through digital processing and inputting the video signal to a light emitting diode (LED) power supply driver to control the LED backlight module plate. 51. The method of claim 50, And said panel is a liquid crystal display (LCD) panel. 51. The method of claim 50, And the panel is a light emitting diode plate of a backlight module.

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