CN-114241965-B - Display apparatus

Abstract

A display device is provided. The display device includes a display panel, a contrast analyzer, a contrast processor, and a data driver. The display panel includes a plurality of sub-display areas. The display panel is configured to display an image based on the input image data. The contrast analyzer is configured to analyze the input image data in a time division method. The contrast processor is configured to adjust the contrast of the input image data based on an analysis result of the contrast analyzer. The data driver is configured to generate a data voltage based on output data of the contrast processor. The number of contrast analysis kernels of the contrast analyzer is determined according to the number of sub-display areas and the frame rate.

Inventors

• REN DAYI
• Cui Nankun

Assignees

• 三星显示有限公司

Dates

Publication Date

20260512

Application Date

20210907

Priority Date

20200909

Claims (9)

1. 1. A display device, the display device comprising: A display panel including a plurality of sub-display areas and configured to display an image based on input image data; A contrast analyzer configured to analyze the input image data in a time division method in which the contrast analyzer analyzes only the input image data corresponding to one of the plurality of sub-display areas during each frame; A contrast processor configured to adjust a contrast of the input image data based on an analysis result of the contrast analyzer, and A data driver configured to generate a data voltage based on output data of the contrast processor, Wherein the number of contrast analysis kernels of the contrast analyzer is determined according to the number of the plurality of sub-display areas and the frame rate, and Wherein the number of contrast analysis kernels increases as the number of the plurality of sub-display areas increases.
2. 2. The display device of claim 1, wherein the number of contrast analysis kernels decreases as the frame rate increases.
3. 3. The display device of claim 1, wherein a number of contrast processor cores of the contrast processor is equal to a number of the plurality of sub-display areas.
4. 4. A display device according to claim 3, wherein the number of contrast analysis cores is smaller than the number of contrast processor cores.
5. 5. The display device of claim 4, further comprising a switch connecting one contrast analysis core to a plurality of the contrast processor cores.
6. 6. The display device of claim 5, further comprising a multiplexer configured to selectively output one of the outputs of the plurality of the contrast processor cores.
7. 7. The display device of claim 4, wherein when the number of the plurality of sub-display areas is two and the frame rate is 60Hz, the number of the contrast analysis cores is one and the number of the contrast processor cores is two.
8. 8. The display device of claim 4, wherein when the number of the plurality of sub-display areas is four and the frame rate is 60Hz, the number of the contrast analysis cores is two and the number of the contrast processor cores is four.
9. 9. The display device of claim 4, wherein when the number of the plurality of sub-display areas is four and the frame rate is 120Hz, the number of the contrast analysis cores is one and the number of the contrast processor cores is four.

Description

Display apparatus Technical Field Embodiments of the inventive concept relate to a display apparatus and a method of driving the same. More particularly, embodiments of the inventive concept relate to a display device that operates contrast analysis cores in a time division method to reduce the number of contrast analysis cores and a method of driving the same. Background The display device may include a flexible display panel. The foldable display device, the rollable display device, the bendable display device, and the slidable display device may be implemented using a flexible display panel. In general, a display device includes a display panel and a display panel driver. The display panel includes a plurality of gate lines and a plurality of data lines. The display panel driver includes a gate driver, a data driver, and a driving controller. The gate driver outputs a gate signal to the gate line. The data driver outputs a data voltage to the data line. The driving controller controls the gate driver and the data driver. The drive controller may include a contrast compensator for enhancing the contrast of the image. A display device including a flexible display panel may include a plurality of sub-display areas. To compensate for the contrast ratio for each of the sub-display areas, the number of cores of the contrast compensator may increase, so that the size of the display panel driver may increase and the power consumption of the display device may increase. Disclosure of Invention Embodiments of the inventive concept provide a display device to operate a contrast analysis core in a time division method to reduce a size of a display panel driver and power consumption of the display device. Embodiments of the inventive concept also provide a method of driving a display device. In an embodiment of the display device according to the inventive concept, the display device comprises a display panel, a contrast analyzer, a contrast processor, and a data driver. The display panel includes a plurality of sub-display areas. The display panel is configured to display an image based on the input image data. The contrast analyzer is configured to analyze the input image data in a time division method. The contrast processor is configured to adjust the contrast of the input image data based on an analysis result of the contrast analyzer. The data driver is configured to generate a data voltage based on output data of the contrast processor. The number of contrast analysis kernels of the contrast analyzer is determined according to the number of sub-display areas and the frame rate. In an embodiment, as the number of sub-display areas increases, the number of contrast analysis kernels may increase. In an embodiment, as the frame rate increases, the number of contrast analysis kernels may decrease. In an embodiment, the number of contrast processor cores of the contrast processor may be equal to the number of sub-display areas. In an embodiment, the number of contrast analysis cores may be less than the number of contrast processor cores. In an embodiment, the display device may further comprise a switch connecting one contrast analysis core to a plurality of contrast processor cores. In an embodiment, the display device may further include a multiplexer configured to selectively output one of the outputs of the plurality of contrast processor cores. In an embodiment, when the number of sub-display areas is two and the frame rate is 60Hz, the number of contrast analysis cores may be one, and the number of contrast processor cores may be two. In an embodiment, when the number of sub-display areas is four and the frame rate is 60Hz, the number of contrast analysis cores may be two and the number of contrast processor cores may be four. In an embodiment, when the number of sub-display areas is four and the frame rate is 120Hz, the number of contrast analysis cores may be one, and the number of contrast processor cores may be four. In an embodiment, when the number of sub-display areas is eight and the frame rate is 120Hz, the number of contrast analysis cores may be two, and the number of contrast processor cores may be eight. In an embodiment, when the number of sub-display areas is sixteen and the frame rate is 240Hz, the number of contrast analysis cores may be two and the number of contrast processor cores may be sixteen. In an embodiment, the contrast analyzer may be configured to convert the first color coordinates of the input image data into the second color coordinates to extract a luminance component of the input image data, generate a luminance histogram based on the luminance component of the input image data, generate a low luminance group, a medium luminance group, and a high luminance group based on the luminance histogram, and determine a first threshold value between the low luminance group and the medium luminance group and a second threshold value between the medium luminance group and the high lumin