TWI386907B - Image display and method and apparatus for image data compensation thereof - Google Patents

Description

Image display device and image data compensation method and device thereof

The present invention relates to an image display device and a method and device for compensating image data thereof, and more particularly to an image display device having a smooth image frame and a method and device for compensating image data.

As technology advances, the size of liquid crystal display devices has become larger. However, when the panel of the liquid crystal display device is larger and larger, although the image data corresponding to the image to be displayed is continuous, the image frame may be faulty because the pixel block on the panel is too large. . The conventional liquid crystal display device adopts a bit extension method, for example, the image data corresponding to each column of pixels is expanded from an image data of an 8-bit size to a 10-bit image data to be utilized. Higher fineness to compensate for the phenomenon of faults. However, traditionally, only the horizontal image pixels are compensated, and for the vertical image pixels, there is still the possibility of a fault.

The invention relates to an image display device and a method and a device for compensating the image data thereof, which use the relationship between the gray scale values of the image data corresponding to the line pixels and smooth the image data corresponding to the pixels. The gray scale value compensates the image data corresponding to the pixel array in the vertical direction.

According to a first aspect of the present invention, an image data compensation method is provided, comprising: first, receiving and storing image data corresponding to adjacent plurality of pixels in a pixel array. Then, one of the image pixels corresponding to one of the row pixels is captured. Then, when the maximum grayscale value and the minimum grayscale value in the image data differ by less than a limited range, the grayscale value of the image data is smoothed.

According to a second aspect of the present invention, an image data compensation apparatus is provided, including a temporary storage unit and a compensation unit. The temporary storage unit receives and stores the image data corresponding to the adjacent plurality of pixels in the pixel array. The compensation unit extracts one image data corresponding to one row of pixels of the adjacent plurality of pixels, and when the maximum grayscale value and the minimum grayscale value in the image data differ by less than a limited range, the compensation unit smoothes the image data. Grayscale value.

According to a third aspect of the present invention, an image display device includes a pixel array, a scan driving unit, an image data compensation device, and a data driving unit. A pixel array has multiple pixels. The scan drive unit controls these pixels. The image data compensation device includes a temporary storage unit and a compensation unit. The temporary storage unit receives and stores the image data corresponding to the adjacent plurality of pixels in the pixel array. The compensation unit extracts one image data corresponding to one row of pixels of the adjacent plurality of pixels, and when the maximum grayscale value and the minimum grayscale value in the image data differ by less than a limited range, the compensation unit smoothes the image data. Grayscale value. The data driving unit outputs the corresponding pixel voltage to the pixels according to the gray scale value of the smoothed image data.

In order to make the above-mentioned contents of the present invention more comprehensible, a preferred embodiment will be described below, and in conjunction with the drawings, a detailed description is as follows:

The invention provides an image display device and a method and a device for compensating the image data thereof, which use the gray scale value of the image data corresponding to the line pixel to be compared with a plurality of specific gray scale values, and then smooth the result according to the comparison result. The grayscale value of the image data corresponding to the pixel is such that the image data corresponding to the pixel array is compensated in the vertical direction.

Please refer to FIG. 1 , which is a block diagram of an image display device in accordance with a preferred embodiment of the present invention. The image display device 100 includes a pixel array 110, a scan driving unit 120, an image data compensation device 130, and a data driving unit 160. The pixel array 110 has a plurality of pixels. The scan driving unit 120 is electrically connected to the pixel array 110 for controlling a plurality of pixels of the pixel array 110.

The image data compensation device 130 includes a temporary storage unit 140 and a compensation unit 150. The temporary storage unit 140 receives and stores the image data corresponding to the adjacent plurality of pixels in the pixel array 110. The compensation unit 150 captures image data corresponding to one of the adjacent pixels of the plurality of pixels. If the difference between the maximum grayscale value and the minimum grayscale value in the image data corresponding to the captured pixel is less than a limited range, the compensation unit 150 smoothes the image data corresponding to the pixel. Grayscale value. Wherein, the limited range is, for example, one.

If the maximum gray scale value and the minimum gray scale value of the image data corresponding to the line pixel exceed the limited range, the compensation unit 150 does not smooth the gray scale value of the image data corresponding to the line pixel, but directly Output image data corresponding to the line pixels. The data driving unit 160 is coupled to the compensation unit 150, and outputs the corresponding pixel voltage to the pixel of the pixel array 110 according to the grayscale value of the smoothed image data or the directly output image data.

Referring to FIG. 2, a detailed block diagram of an image data compensation apparatus 130 in accordance with a preferred embodiment of the present invention is shown. The image data compensation device 130 includes a temporary storage unit 140 and a compensation unit 150. The temporary storage unit 140 includes a plurality of line buffers for storing image data corresponding to the adjacent plurality of columns of pixels. Such image data is, for example, image data that has been compensated in the horizontal direction.

The compensation unit 150 includes a comparison unit 152, a processing unit 154, a comparison unit 156, and a compensator 158. In the compensation unit 150, the comparison unit 152 captures the image data corresponding to one of the adjacent rows of pixels, and takes the minimum value of the grayscale value of the image data corresponding to the pixel. The processing unit 154 normalizes the grayscale value of the image data corresponding to the row of pixels according to the obtained minimum grayscale value.

The comparison unit 156 is configured to compare the grayscale value of the normalized image data with a plurality of specific grayscale values, and if the relationship between the grayscale values of the image data corresponding to the pixel is the same One of the specific grayscale values shows that the comparison unit 156 outputs a set of compensation values corresponding to the specific grayscale value. The compensator 158 adds the set of compensation values to the minimum gray scale value to smooth the gray scale value of the image data corresponding to the line pixels.

The temporary storage unit 140 includes five line buffers 141 to 145 as an example for explanation. The line buffers 141-145 are respectively used for storing image data corresponding to the adjacent five columns of pixels in the pixel array 110. The image data may be image data that has been compensated in the horizontal direction, or may be original uncompensated images. data. The comparison unit 152 extracts image data corresponding to a row of pixels from the line buffers 141 to 145, and the grayscale values of the image data are, for example, 128, 127, 127, 127, and 127. The comparison unit 152 obtains the minimum grayscale value 127 from the five grayscale values.

The processing unit 154 normalizes the five grayscale values 128, 127, 127, 127, and 127 according to the minimum grayscale value 127, for example, subtracts the minimum grayscale value 127 from the five grayscale values to obtain one. The normalized gray scale values 1, 0, 0, 0, 0. The comparison unit 156 is shown as a grayscale value 1, 0, 0, 0, 0 normalized to the group and a plurality of specific grayscale values. When the temporary storage unit 140 includes 5 line buffers, examples of the plurality of specific gray scale values are 1, 0, 0, 0, 0 or 1, 0, 0, 0, 1, or 0, 0, 0, 0, 1. Among them, since the high-frequency components in the image data are taken into consideration, the gray scale value samples such as 1, 0, 1, 0, 1 or 0, 1, 0, 1, 0 are not listed as one of the specific gray scale values. In order to avoid destroying the sharpness of the image.

After the normalized grayscale value 1, 0, 0, 0, 0 is the same as one of the plurality of specific grayscale value samples described above, the comparison unit 156 outputs a corresponding specific grayscale value sample 1, 0. The compensation value of one of 0, 0, and 0 is, for example, 1, 0.75, 0.5, 0.25, and 0. The compensator 158 adds the set of compensation values 1, 0.75, 0.5, 0.25, 0 to the minimum gray scale value 127, and obtains the gray scale values of the image data corresponding to the compensated line pixels by 128, 127.75, 127.5, and 127.25. 127. In this way, the grayscale value of the image data corresponding to the pixel can be smoothed.

If the grayscale values of the image data corresponding to the line pixels extracted by the comparison unit 152 from the line buffers 141 to 145 are, for example, 128, 126, 126, 126, and 126, since the maximum value 128 and the minimum value 126 are different from each other, When the finite range is exceeded, the compensation unit 150 does not smooth the grayscale values 128, 126, 126, 126, and 126 of the image data corresponding to the line pixels, and directly outputs the grayscale values 128, 126, 126, 126, and 126.

The present invention also discloses a method for compensating image data. Referring to FIG. 3, a flow chart of a method for compensating image data according to a preferred embodiment of the present invention is shown. First, in step 300, the image data corresponding to the adjacent plurality of pixels in the pixel array is received and stored. Then, in step 310, image data corresponding to one of the adjacent rows of pixels is extracted. Next, in step 320, the minimum grayscale value in the image data corresponding to the pixel is taken.

In step 330, the grayscale value of the image data corresponding to the line pixel is normalized according to the minimum grayscale value. Then, in step 340, the grayscale value of the normalized image data is compared with a plurality of specific grayscale values. Then, in step 350, when the grayscale value of the normalized image data is the same as a first specific grayscale value, the first specific grayscale value is shown as one of a plurality of specific grayscale values. Then, according to the corresponding one of the first set of compensation values, the grayscale value of the image data corresponding to the line pixel is smoothed.

The image data compensation method disclosed in the above embodiments of the present invention has been described in detail in the image data compensation device 130, and thus will not be repeated herein.

The image display device and the image data compensation method and device thereof disclosed in the above embodiments of the present invention are compared with the grayscale value of the image data corresponding to the line pixel and a plurality of specific grayscale values. If the grayscale value of the corresponding image data is the same as one of the plurality of specific grayscale values, the grayscale value of the image data corresponding to the pixel is smoothed according to the corresponding compensation value. In this way, the image data corresponding to the pixel array is compensated in the vertical direction. Therefore, the image displayed by the image display device will be smoother, no fault phenomenon, and the sharpness of the image image is maintained.

In view of the above, the present invention has been disclosed in a preferred embodiment, and is not intended to limit the present invention. A person skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

100. . . Image display device

110. . . Pixel array

120. . . Scan drive unit

130. . . Image data compensation device

140. . . Staging unit

141~145. . . Line buffer

150. . . Compensation unit

152. . . Comparison unit

154. . . Processing unit

156. . . Alignment unit

158. . . Compensator

160. . . Data drive unit

1 is a block diagram of an image display device in accordance with a preferred embodiment of the present invention.

FIG. 2 is a detailed block diagram of an image data compensation device 130 in accordance with a preferred embodiment of the present invention.

FIG. 3 is a flow chart of a method for compensating image data according to a preferred embodiment of the present invention.

130. . . Image data compensation device

140. . . Staging unit

141~145. . . Line buffer

150. . . Compensation unit

152. . . Comparison unit

154. . . Processing unit

156. . . Alignment unit

158. . . Compensator

Claims (19)

An image data compensation method includes: (a) receiving and storing image data corresponding to adjacent plural columns of pixels in a pixel array; and (b) extracting one of the row pixels of the column pixels And (c) smoothing the grayscale value of the image data when the maximum grayscale value and the minimum grayscale value in the image data differ by less than a finite range. The image data compensation method according to claim 1, wherein the step (c) further comprises: (c1) making a relationship between the grayscale values of the image data and a plurality of specific grayscale values. And (c2) if the grayscale value of the image data is the same as one of the specific grayscale values, the grayscale value of the image data is smoothed. The image data compensation method of claim 2, wherein the step (c1) further comprises: (c11) taking the minimum grayscale value in the image data; (c12) normalizing the minimum grayscale value according to the minimum grayscale value; The grayscale value of the image data; and (c13) the normalized grayscale values are plotted against the specific grayscale values. The image data compensation method of claim 2, wherein the step (c2) further comprises: (c21) if the relationship between the grayscale values of the image data is the same as a first specific grayscale value, The first specific gray scale value is shown as one of the specific gray scale value samples, and the gray scale value of the image data is smoothed according to the corresponding one of the first set of compensation values. The image data compensation method of claim 1, wherein if the maximum grayscale value in the image data differs from the minimum grayscale value by more than the limited range, the grayscale value of the image data is not smoothed. Movement. The image data compensation method according to claim 5, wherein the limited range is 1. An image data compensation device includes: a temporary storage unit configured to receive and store image data corresponding to adjacent plurality of pixels in a pixel array; and a compensation unit for capturing the column pixels One of the image data corresponding to the line pixel, and when the maximum gray scale value and the minimum gray scale value in the image data differ by less than a limited range, the compensation unit smoothes the gray scale value of the image data. The image data compensation device of claim 7, wherein the temporary storage unit comprises a plurality of line buffers for storing image data corresponding to the column pixels . The image data compensation device of claim 7, wherein the compensation unit comprises: a comparison unit for taking the minimum gray level value for the image data; and a processing unit for determining the minimum gray level value Normalizing the grayscale value of the image data; a comparison unit for comparing the grayscale values and the plurality of specific grayscale values after the normalization, if the grayscale value of the image data has the same relationship The one of the specific gray scale values shows that the comparison unit outputs a corresponding one of the set of compensation values; and a compensator for grading the gray scale value of the image data according to the set of compensation values. The image data compensation device of claim 9, wherein the specific gray scale value shows that the maximum gray scale value and the minimum gray scale value differ by less than the limited range. The image data compensating device according to claim 10, wherein the limited range is 1. The image data compensation device of claim 7, wherein if the maximum grayscale value of the image data differs from the minimum grayscale value by more than the limited range, the compensation unit does not have a grayscale value of the image data. Smoothing action. An image display device includes: a pixel array having a plurality of pixels; a scan driving unit for controlling the pixels; and an image data compensation device comprising: a temporary storage unit for receiving and storing the pixel The image data corresponding to the adjacent plurality of pixels in the pixel array; and a compensation unit for capturing one of the image data corresponding to one of the column pixels, and the largest image data The difference between the grayscale value and the minimum grayscale value is less than a limited range, the compensation unit smoothes the grayscale value of the image data, and a data driving unit is configured to output the corresponding grayscale value according to the smoothed image data. The pixel voltage is to the pixels. The image display device of claim 13, wherein the temporary storage unit comprises a plurality of line buffers for storing image data corresponding to the column pixels. The image display device of claim 13, wherein the compensation unit comprises: a comparison unit for taking the minimum gray level value for the image data; and a processing unit for normalizing according to the minimum gray level value a grayscale value of the image data; a comparison unit for comparing the grayscale values and the plurality of specific grayscale values after the normalization, if the grayscale value of the image data has the same relationship One of the specific gray scale values shows that the comparison unit outputs a corresponding set of compensation values; and a compensator for grading the gray scale value of the image data according to the set of compensation values. The image display device of claim 15, wherein the specific gray scale value shows that the maximum gray scale value differs from the minimum gray scale value by less than the limited range. The image display device of claim 16, wherein the limited range is 1. The image display device of claim 13, wherein if the maximum grayscale value in the image data differs from the minimum grayscale value by more than the limited range, the compensation unit does not perform the grayscale value of the image data. Smooth action. The image display device of claim 13, wherein the image data corresponding to each column of pixels in the pixel array has been smoothed.