CN-122003711-A - Local dimming method and video data processing apparatus implementing the same

CN122003711ACN 122003711 ACN122003711 ACN 122003711ACN-122003711-A

Abstract

The video data processing apparatus according to an embodiment of the present invention includes a block acquisition unit to receive a video image and acquire a plurality of blocks of the video image, a data analysis unit to analyze original video data of the video image including the plurality of blocks to calculate a representative luminance value of one block, a dimming value calculation unit to calculate a dimming value for adjusting luminance of a backlight according to the representative luminance value for each region, a filter unit to adjust the dimming value via filtering to generate a filtered dimming value, a light amount calculation unit to calculate a light amount of the backlight in response to the filtered dimming value, a feedback calculation unit to perform feedback based on the calculated light amount to reach a target light amount, a gain calculation unit to calculate a gain to compensate the original video data according to the dimming value, and a data conversion unit to apply the calculated gain to the original video data to generate converted video data.

Inventors

Zhao Zaican
Lin Zhoujiong
LIU ZONGXIANG
LI ZONGXUN
PU JUNYONG

Assignees

LX半导体科技有限公司

Dates

Publication Date: 20260508
Application Date: 20241008
Priority Date: 20231013

Claims (10)

1. A video data processing apparatus, the video data processing apparatus comprising: a block acquisition unit configured to receive a video image and acquire a plurality of blocks of the video image; A data analysis unit configured to analyze original video data of the video image including the plurality of blocks and calculate a representative luminance value of one block; A dimming value calculation unit configured to calculate, for each region, a dimming value for adjusting luminance of the backlight according to the representative luminance value; A filter unit configured to generate a filtered dimming value by adjusting the dimming value via filtering; A light amount calculation unit configured to calculate a light amount of the backlight corresponding to the filtered dimming value; a feedback calculation unit configured to perform feedback based on the calculated light amount to reach a target light amount; A gain calculation unit configured to calculate a gain for compensating the original video data according to the dimming value, and A data conversion unit configured to generate converted video data by applying the calculated gain to the original video data.
2. The video data processing apparatus according to claim 1, wherein the dimming value calculation unit is configured to output an initial target dimming value according to a target light amount of a previous frame.
3. The video data processing apparatus according to claim 2, wherein the light amount calculation unit is configured to calculate the actual light amount of the current frame based on the filtered dimming value of the previous frame.
4. The video data processing apparatus according to claim 3, wherein the feedback calculation unit is configured to determine whether to perform feedback by comparing the actual light amount of the current frame with the target light amount.
5. The video data processing apparatus according to claim 4, wherein the feedback calculation unit is configured to determine to perform the feedback when a pre-filter dimming value of the current frame is greater than or equal to the actual light amount of the current frame and less than or equal to a filtered dimming value of the previous frame.
6. The video data processing apparatus according to claim 5, wherein the feedback calculation unit is configured to calculate, when the feedback is performed, a difference between the pre-filter dimming value and the pre-filter dimming value of the current frame as a feedback value.
7. The video data processing apparatus according to claim 6, wherein the feedback calculation unit is configured to increase or decrease the feedback value according to whether the feedback value is greater than or less than an arbitrary value.
8. The video data processing apparatus according to claim 1, wherein the gain calculation unit is configured to receive a feedback light amount according to the feedback, and calculate a gain for compensating the original video data.
9. The video data processing apparatus of claim 8, wherein the data conversion unit is configured to generate the converted video data by applying a dimming value of a previous frame to the video data of a current frame.
10. A local dimming method, the local dimming method comprising the steps of: receiving a video image and acquiring a plurality of blocks of the video image; analyzing raw video data of said video image comprising said plurality of blocks and calculating a representative luminance value for a block; calculating, for each region, a dimming value for adjusting the luminance of the backlight according to the representative luminance value; generating a filtered dimming value by adjusting the dimming value via filtering; calculating an amount of light of the backlight corresponding to the filtered dimming value; Performing feedback based on the calculated light amount to reach the target light amount; calculating a gain for compensating the original video data based on the dimming value, and Converted video data is generated by applying the calculated gain to the original video data.

Description

Local dimming method and video data processing apparatus implementing the same Technical Field The present embodiment relates to local dimming, and more particularly, for example, to local dimming applicable to a Light Emitting Diode (LED) panel or the like, but is not necessarily limited thereto. Background Among the various components constituting the electronic device, the component having the highest power consumption is the display device. Because the display device remains on while providing information to the user and needs to continuously output light during the on time, its power consumption is higher than that of other components in the electronic device. For this reason, manufacturers of electronic devices have been under study and development to reduce the power consumption of display devices. Representative examples thereof include a technique for switching the display device to a standby mode or turning on only a part of the display panel. However, since these techniques reduce power consumption of the display device by substantially limiting the user environment, there is a problem that user inconvenience is inevitably caused. Meanwhile, a technology of reducing power consumption of a display device is being developed without changing a user environment or while only involving an environment that is difficult for a user to perceive, and one representative example is a local dimming technology. Local dimming is a technique for driving a backlight with partially different brightness levels. According to the local dimming, a plurality of backlight units (BLU) divide the display panel into a plurality of regions, and light of different brightness may be irradiated to each of the divided regions. Here, when the luminance difference between backlight units that irradiate light to each region is large, an artifact (artifact) may occur. In order to eliminate such artifacts, filtering is performed during video processing, however, the brightness of the backlight unit may increase during the filtering process. In particular, when the luminance of the peripheral backlight unit is high, the luminance of the corresponding backlight unit may also be increased. When the brightness of the corresponding backlight unit increases, power consumption increases accordingly. Although the power consumption of the backlight unit is reduced as compared with the case where the local dimming is not applied, the power consumption may be increased to some extent due to the filtering, and thus more effective reduction of the power consumption may not be achieved. Therefore, a local dimming technique is required to effectively reduce power consumption. Disclosure of Invention Technical problem One embodiment of the present invention provides a local dimming technique for effectively reducing power consumption in order to solve the above-described problems and the like. Embodiments of the present invention also provide a technique for controlling a dimming value through feedback regarding a target light amount. The technical problems to be solved by the present invention are not limited to the above technical problems, and other technical problems not described herein will be clearly understood by those of ordinary skill in the art to which the present invention pertains from the following description. Technical proposal A video data processing apparatus according to any one of the embodiments of the present invention for solving the above-described problems may include a block acquisition unit configured to receive a video image and acquire a plurality of blocks for the video image, a data analysis unit configured to analyze original video data of the video image including the plurality of blocks and calculate a representative luminance value of one block, a dimming value calculation unit configured to calculate a dimming value for adjusting luminance of a backlight according to the representative luminance value for each region, a filter unit configured to generate a filtered dimming value by adjusting the dimming value through filtering, a light amount calculation unit configured to calculate a light amount of the backlight corresponding to the filtered dimming value, a feedback calculation unit configured to perform feedback based on the calculated light amount to reach a target light amount, a gain calculation unit configured to calculate a gain for compensating the original video data according to the dimming value, and a data conversion unit configured to generate converted video data by applying the calculated gain to the original video data. According to an embodiment, the dimming value calculation unit may be configured to output the initial target dimming value according to the target light amount of the previous frame. According to an embodiment, the light amount calculation unit may be configured to calculate the actual light amount of the current frame based on the filtered dimming value of the previous frame.