KR100229071B1 - White balance control system of plasma display device - Google Patents

Abstract

The present invention calculates the degree of deviation of the white balance of the manufactured plasma display device and converts the R (Red), G (Green), and B (Blue) analog image data inputted from the outside to suitably convert the white balance of the plasma display device. The white balance adjustment system of the plasma display device which can adjust to

A plasma display device which receives a color signal of each of R, G, and B and displays the same on a plasma display panel, wherein the sample detection unit detects respective color coordinate values of R, G, and B color components at at least one sample point among the display panels. And a reference data storage unit that stores the standard color coordinate values of ideal R, G, and B color components in advance, and compares the standard color coordinate values pre-stored in the reference data storage unit with the color coordinate values of the display panel inputted from the sample detection unit. Converting R, G, and B data input by a comparison operation unit for detecting an error value, a correction data generation unit for generating correction data in accordance with an output of the comparison operation unit, and correction data output from the correction data generation unit. An image data converter and a panel drive controller for driving the display panel by the image data converted by the image data converter; Characterized in that configured.

Description

White Balance Adjustment System of Plasma Display

1 is a block diagram showing a simplified configuration of a typical plasma display device.

2 is a block diagram showing a configuration of a white balance adjustment system of a plasma display device according to the present invention.

* Explanation of symbols for main parts of the drawings

10 plasma display device 11 plasma display panel

12: control unit 12a: analog to digital converter

13, 13 ': address driver 20: white balance adjustment device

21: sample detection unit 22: comparison operation unit

23: correction data generation unit 24: image data conversion unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a white balance adjustment system of a plasma display device. In particular, an analog of R (Red), G (Green), and B (Blue) input from the outside is calculated by calculating the deviation of the white balance of a manufactured plasma display device. A white balance adjustment system of a plasma display device capable of properly adjusting the white balance of the plasma display device by appropriately converting image data.

As the modern society is called the information society, the importance of the display device is increasing with the development and spread of the information processing system, and the types thereof are gradually diversifying.

CRT (Cathode Ray Tube), which has been used most often as a display device, has various problems such as large size, high operating voltage, and display distortion. Recently, research and development of various flat display devices having a matrix structure have been actively conducted.

In other words, the flat panel display has a matrix structure and displays a stable image without display distortion and color bleeding, and has a flat structure, and has a thin thickness and low operating voltage, such as a large screen television, a wall-mounted television, a portable computer, or the like. It can be applied to a wide range of applications.

A device including a plasma display panel, which is a light emitting device, and displaying a moving image or a still image by using a gas discharge phenomenon inside the plasma display panel is called a plasma display device.

A typical plasma display device includes a plasma display panel 1 having an address electrode and first and second sustain electrodes formed thereon as shown in FIG. An analog / digital converter (2a) that receives and digitizes analog image data of R, G, and B, and outputs the first and second light emission sustain pulses to be supplied to the first and second sustain electrodes according to an input signal. And a controller 2 for generating and outputting various control signals; An address driver (3, 3 ') for supplying digitized image data (gradation data) of R, G, and B output from the analog-to-digital converter (2a) to the address electrode in accordance with the control signal; And first and second sustain drivers 4 and 5 for supplying the first and second emission sustain pulses to the first and second sustain electrodes, respectively, in accordance with the control signal.

A method of displaying a moving image and a still image by the subfield method by the plasma display device configured as described above is as follows.

First, the control unit 2 and the first and second sustain drivers 4 and 5 supply specific pulses to the first and second sustain electrodes so that each cell of the plasma display panel 1 is not affected by the previous light emission state. After the discharge erase of all cells is performed, the first sustain driver 4 supplies a line scan pulse to the first sustain electrode while the address drivers 3 and 3 'digitize R, G, and One bit of image data of B is supplied to light a specific cell supplied with 1 (high pulse) as the bit value.

Subsequently, when the control unit 2 and the first and second sustain drivers 4 and 5 supply the number of emission sustain pulses corresponding to the first subfield to the first and second sustain electrodes, the emission of the specific cell is performed by the first subfield. If the discharge erasing step, the image data supplying step, and the light emission sustain pulse supplying step of all the cells are performed for the remaining subfield for the corresponding time of the field, the image of one frame is transferred to the plasma display panel 1. Is displayed.

Further, in any one calcination, i.e., the digitized R, G, B image data (consisting of the same number of bits as the number of subfields) supplied to the address electrodes of three cells of R, G, and B during the period of one frame. Accordingly, a variety of colors are realized in the arbitrary one pixel by a combination of red, blue, and green visible light of R, G, and B cells that are appropriately emitted.

In other words, when the same image data (gradation data) is supplied to each of the R, G, and B cells constituting one pixel, theoretically white (achromatic color) is implemented, and when different image data is supplied, each of the R, G, and B cells Various colors are realized according to the ratio of light emission amount.

On the other hand, when the plasma display device is deteriorated due to deterioration due to long use of the plasma display device or for various other reasons, the accurate color of the image data may not be realized on the plasma display panel 1.

Accordingly, although not shown in the prior art, a plurality of white balance correction address electrodes are additionally formed on the plasma display panel such that the address electrodes of the plasma display panel, that is, separate white balance correction address lines correspond to each address line. When the white balance was adjusted, separate R, G, and B correction data were supplied to each of the white balance correction address electrodes.

However, when a plurality of white balance correction address electrodes are additionally formed in the plasma display panel as in the related art, the manufacturing cost and the number of manufacturing steps of the plasma display device are increased, and separate R, G, and B corrections are performed on the white balance correction address electrodes. In order to supply data, a complicated data processing circuit must be included in the plasma display device, which causes a complicated circuit configuration of the plasma display device.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and calculates the degree of deviation of the white balance by detecting the color data currently displayed at a specific position of the panel and comparing it with the reference data. By converting the analog image data of R, G, and B to adjust the white balance to normal, the white balance correction address electrode need not be additionally formed on the plasma display panel, thereby reducing the manufacturing cost and the number of manufacturing steps of the plasma display device. It is an object of the present invention to provide a white balance adjustment system of a plasma display device which can be reduced.

In order to achieve the above object, a white balance adjustment system of a plasma display device according to the present invention is a plasma display device which receives a color signal of each of R, G, and B and displays them on a plasma display panel, wherein at least one of the display panels is provided. A sample detector for detecting color coordinate values of R, G, and B color components at one or more sample points; and reference data and storage for storing standard color coordinate values of ideal R, G, and B color components in advance, and storing the reference data. A comparison operation unit for comparing the standard color coordinate values stored in the unit with the color coordinate values of the display panel input from the sample detection unit to detect an error value, a correction data generation unit for generating correction data according to the output of the comparison operation unit; Image data for converting the R, G, and B data input by the correction data output from the correction data generator. And a panel driving control unit for driving the display panel by the image data converted by the image data conversion unit.

In this case, according to an additional feature of the present invention, the specimen detecting unit detects the intensity of light at the sample point, and the intensity of light detected by the sensing means for X, Y for each of R, G, and B. And X and Y color coordinate converting means for outputting after converting to color coordinates. In this case, when the sample point is two or more points, the X and Y color coordinates of the average value of all the sample points are output.

The correction data generation unit may include calculation means for calculating a correction weight of the R, G, and B color signals according to the error value output from the comparison operation unit. Further, the image data conversion unit multiplies R, G, and B data, which is address data to display correction weights of R, G, and B data output from the correction data generation unit, to obtain corrected R, G, and B data.

Hereinafter, an embodiment of a white balance adjustment system of a plasma display device according to the present invention will be described in detail with reference to the accompanying drawings.

First, as shown in FIG. 2, the plasma display device according to the present invention receives the plasma display panel 11 having the address electrode and the first and second sustain electrodes, and receives analog image data of R, G, and B. And a control unit 12 including an analog / digital converter 12a for outputting and generating and outputting first and second emission sustain pulses and various control signals to be supplied to the first and second sustain electrodes, respectively, according to an input signal. Wow ; And an address driver 13, 13 'for supplying digitized image data (gradation data) of the R, G, and B output from the analog-to-digital converter 12a to the address electrode in accordance with the control signal. .

The white balance adjustment system of the plasma display device according to the present invention detects the intensity of light at least one or more sample points of the plasma display panel 11, as shown in FIG. A sample detector 21 that calculates and outputs the X and Y color coordinate values of B and the X and Y color coordinate values of R, G, and B for each sample point, and receives the X and Y color coordinates of standard R, G, and B. A comparison operation unit 22 which calculates and outputs an average error value for X and Y after comparing the color coordinate values with each other, and receives an average error value for the X and Y, respectively, for correcting a white balance corresponding to R, A correction data generation unit 23 for outputting correction data of G and B, and when the correction data of R, G, and B are input, converts the analog image data of R, G, and B by weighting the control unit ( Image data output by analog-to-digital converter 12a of 12) It consists of the conversion section 24.

The sample detector 21 detects the intensity of light at a sample point 21a and converts the intensity of light detected by the detection means 21a into X, Y color coordinates of R, G, and B. It consists of X and Y color coordinate conversion means 21b which calculates and outputs the X and Y color coordinate values of R, G, and B, which are then averaged.

The comparison operation unit 22 is a storage means 22a for storing X, Y color coordinate values of standard R, G, and B corresponding to the plasma display panel 11, and X, Y of the sample detector 21. Receives the X, Y color coordinate values of R, G, and B output from the color coordinate converting means 21b, and compares them with the X, Y color coordinate values of the standard R, G, and B, and compares the error values (X, Y) with each other. A comparison means 22b for outputting ΔY and an average value calculation means 22c for calculating an average value of the error values for X and Y of each sample point output from the comparison means 22b and outputting the average error value. It consists of.

The correction data generator 23 outputs R, G, and B correction data for white balance adjustment. The correction data is expressed as a weight that can be obtained by multiplying an error between the input data and the reference data by the input color data. do. For example, if the detected color signal is larger than the reference data, the weight has a weight less than 1 to compensate for the error in the color data, and if the detected color data is the same as the reference data, the weight is 1 If the detected color signal is smaller than the reference data, the weight has a weight greater than 1 to increase the input data value.

The image data converting unit 24 multiplies and outputs the corresponding correction data among the R, G, and B correction data inputted from the correction data generating unit 23 by the analog image data, and outputs the multiplication means 24a, 24b, 24c).

Referring to the operation and effects of the present invention configured as described above in more detail.

First, in order to adjust the white balance, the sensing means 21a and the X and Y color coordinate conversion means 21b of the sample detecting unit 21 are displayed at each sample point in the state where white is displayed on the plasma display panel 11. When the X, Y color coordinate values of R, G, and B are calculated and output, the comparison means 22b of the comparison operation unit 22 reads the X, Y color coordinate values of standard R, G, and B from the storage means 22a. Compare the X, Y color coordinate values of R, G, B for each sample point output from the X, Y color coordinate conversion means 21b, and calculate the error values (ΔX, ΔY) for each X, Y. Output

When all the error values ΔX and ΔY of the X and Y of the respective sample points are output from the comparison means 22b, the average value calculating means 22c of the comparison operation unit 22 is the X and Y of each sample point. An average error value is calculated by calculating an average value of the error values DELTA X and DELTA Y.

After that, when the mean error value is input from the mean value calculating means 22c, the correction data generator 23 outputs correction data of R, G, and B corresponding to the mean error value, and the image data converter 24 R, G, and B multiplication means 24a, 24b, and 24c respectively multiply the corresponding correction data by the corresponding analog image data input from the outside and output them to the analog-to-digital converter 12a of the control unit 12.

Thereafter, when the same image display process as that of the general plasma display apparatus described above is performed, the white balance of the plasma display apparatus is adjusted to normal to realize accurate colors according to the image data on the plasma display panel 11.

Meanwhile, as shown in FIG. 2, the image data converter 24 is mounted inside the plasma display apparatus 10, and the remaining sample detector 21, the comparison operator 22, and the correction data generator 23 are mounted. When the separate white balance adjusting device 20 is manufactured, the configuration of the plasma display device 10 is simplified than before, and the white balance of the manufactured plasma display device 10 is transferred to the white balance adjusting device 20. Can be adjusted easily.

As described above, since the present invention converts the analog data of R, G, and B inputted from the outside, there is no need to additionally form an address electrode for white balance correction on the plasma display panel. In this case, since only the image data converter is mounted inside the plasma display device and the rest is manufactured as a separate device, the configuration of the plasma display device can be simplified.

Claims (5)

In the plasma display device for receiving the color signal of each of the R, G, B, and display on the plasma display panel, A sample detector for detecting respective color coordinate values of the R, G, and B color components at at least one sample point of the display panel, a reference data storage unit pre-stored standard color coordinate values of the ideal R, G, and B color components; A comparison operation unit for comparing the standard color coordinate values stored in the reference data storage unit with the color coordinates of the display panel input from the sample detection unit to detect an error value, and correction data for generating correction data according to the output of the comparison operation unit; A display unit is driven by a generation unit, an image data conversion unit for converting R, G, and B data input by the correction data output from the correction data generation unit, and an image data converted by the image data conversion unit. A white balance adjustment system of a plasma display device, comprising a panel driving control unit. The method of claim 1, The sample detecting unit detects the intensity of light at a sample point, and converts the intensity of light detected by the sensing means into X and Y color coordinates for each of R, G, and B, and outputs the X and Y color coordinates. White balance adjustment system of the plasma display device comprising a conversion means. The method of claim 2, And outputting X and Y color coordinates for calculating an average value at all the sample points when the sample points are two or more points. The method of claim 1, And the calculating means for calculating correction weights of the R, G, and B color signals according to the error values output from the comparison operation unit. The method according to claim 1 or 4, The image data conversion unit obtains corrected R, G, B data by multiplying the R, G, B data, which is address data to display correction weights of the R, G, B data output from the correction data generator. White balance adjustment system of a plasma display.