Patent Application
20250124885
This application claims priority to Taiwan Patent Application No. 113147322, filed on Dec. 5, 2024. The entire contents of Taiwan Patent Application No. 113147322 are incorporated herein by reference.
The disclosure relates to a backlight compensation technology, and in particular to a display and a backlight compensation method thereof.
Conventional sub-millimeter light-emitting diode (LED) displays may not be able to maintain optical performance in key optical characteristics during local dimming because the dimming algorithms are mainly focused on power saving, for example, the gamma value may change from 2.2 to 2.8 after local dimming, as shown in
The disclosure provides a display and a backlight compensation method thereof, which mainly achieve an adjustable backlight compensation manner that maintains optical quality without reducing the resolution of the image data (i.e., maintaining the resolution of the image data) and can maintain the luminance and the gamma value under different windows sizes.
The disclosure provides a display, including a backlight unit and a driving unit. The backlight unit has first display luminances, a windows size and a corresponding luminance dependency of windows size, and also has a plurality of areas, and each area has an area peak luminance. The driving unit couples the backlight unit and calculates the first display luminance according to a product of each of the plurality of area peak luminances and the luminance dependency of windows size. Each of the first display luminances corresponds to each area in the backlight unit.
In an example of the disclosure, the backlight unit further includes: a black screen grayscale measured value, a white screen grayscale measured value and a second display luminance. The second display luminance is obtained by normalizing a difference between the black screen grayscale measured value and the white screen grayscale measured value as a base number and raising the base number to the power of the gamma value.
The disclosure provides a backlight compensation method of a display. The display has a driving unit and a backlight unit. The backlight compensation method includes: providing a gamma value of the display; performing local dimming of the backlight unit according to the gamma value; obtaining an area peak luminance of each area in the backlight unit; obtaining a windows size of the backlight unit and a corresponding luminance dependency of windows size; obtaining, by the driving unit, a first display luminance corresponding to each area in the backlight unit according to a product of the area peak luminance of each area and the luminance dependency of windows size; and performing luminance compensation in each area of the backlight unit according to the first display luminance.
In an example of the disclosure, the performing the local dimming of the backlight unit in the display according to the gamma value of the display includes: normalizing a difference between a black screen grayscale measured value and a white screen grayscale measured value of the backlight unit as a base number, and raising the base number to the power of the gamma value, thereby obtaining a second display luminance of the backlight unit; and performing the local dimming of the backlight unit based on the second display luminance.
In an example of the disclosure, the gamma value is 2.2.
In an example of the disclosure, the windows size has an inverse relation with the luminance dependency of windows size.
In an example of the disclosure, the windows size is a ratio of a white screen area in the backlight unit to a panel area of the backlight unit.
According to the disclosure, by compensating for the luminance difference after the local dimming of the backlight unit and adjusting the luminance dependency of windows size of the backlight unit from many aspects according to different windows sizes, the optical quality can be maintained without reducing the resolution of the image data, and the luminance and the gamma value can be maintained under different windows sizes.
Other objectives, features and advantages of the invention will be further understood from the further technological features disclosed by the embodiments of the invention wherein there are shown and described preferred embodiments of this invention, simply by way of illustration of modes best suited to carry out the invention.
The present invention is particularly described with the following examples, which are merely for illustration. For those skilled in the art, various modifications and refinements can be made without departing from the spirit and scope of this disclosure. Therefore, the scope of protection of this disclosure shall be defined by the appended claims. Throughout the specification and claims, unless clearly specified otherwise, the meaning of “a” and “the” includes “one or at least one” element or component. In addition, as used in the present invention, unless it is clearly apparent from the context that the plural is excluded, the singular also includes the plural elements or components. Additionally, when used in this description and all the following claims, unless clearly specified otherwise, “therein” can mean “in” and “on”. The terms used throughout this specification and claims, unless specifically noted, usually have their ordinary meanings in the field, in the context of this disclosure, and in the specific context. Some terms used to describe the present invention will be discussed below or elsewhere in this specification to provide additional guidance to a practitioner regarding the description of the present invention. Any examples given anywhere throughout the specification, including the use of any terms discussed herein, are merely for description and do not limit the scope and meaning of the present invention or any exemplified terms. Likewise, the present invention is not limited to the various embodiments proposed in this specification.
As used herein, the terms “substantially,” “around,” “about,” or “approximately” should generally mean within 20% of a given value or range, preferably within 10%. Furthermore, quantities provided herein may be approximate, meaning that unless specifically stated otherwise, they can be expressed using the terms “about,” “around,” or “approximately.” When a range, a preferred range, or a set of upper and lower ideal values are specified for quantities, concentrations, or other values or parameters, it should be considered that all ranges formed by any pair of upper and lower limits or ideal values are specifically disclosed, regardless of whether such ranges are separately disclosed. For example, if a range of a length is disclosed as X cm to Y cm, it should be considered as disclosing a length of H cm, where H can be any real number between X and Y.
Furthermore, if a term “coupled” or “connected” is used herein, it includes any direct and indirect electrical connection measures. For example, a text describes that a first apparatus is electrically coupled to a second apparatus, meaning that the first apparatus may be connected to the second apparatus directly or indirectly via through other apparatuses or connection measures. Additionally, if a description involves transmission or provision of electrical signals, those skilled in the art should understand that the transmission of electrical signals may be accompanied by attenuation or other non-ideal changes, but unless specifically stated otherwise, the electrical signals transmitted or provided from sources to receiving ends should be considered as substantially the same signal. For example, in a case that an electrical signal S is transmitted (or provided) from an endpoint A of an electronic circuit to an endpoint B, where it may pass by the source and drain terminals of a transistor switch and/or a possible stray capacitor, causing a voltage drop, but if the objective of such design is not to intentionally use the attenuation or other non-ideal changes during transmission (or provision) to achieve certain technical effects, the electrical signal S at the endpoint A and the electrical signal S at the endpoint B of the electronic circuit should be considered substantially the same signal.
It can be understood that the terms “comprising,” “including,” “having,” “containing,” “involving,” and the like as used herein are open-ended, meaning inclusion but being not limited thereto. Additionally, any embodiment or claim of the present invention does not have to achieve all the objectives, advantages, or features disclosed in the present invention. Furthermore, the abstract and title are only for assisting in patent document searches and are not intended to limit the claims of the present invention.
First,
Next, as shown in
Based on the above, according to the display and the backlight compensation method display provided by the disclosure, by compensating for the luminance difference after the local dimming of the backlight unit and adjusting the luminance dependency of windows size of the backlight unit according to different windows sizes, the optical quality can be maintained without reducing the resolution of the image data, and the luminance and the gamma value can be maintained under different windows sizes. In addition, the provided backlight compensation manner may be a composite condition other than area and luminance, and the disclosure is not limited thereto.
While the invention has been described in terms of what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention needs not be limited to the disclosed embodiment. On the contrary, it is intended to cover various modifications and similar arrangements included within the spirit and scope of the appended claims which are to be accorded with the broadest interpretation so as to encompass all such modifications and similar structures.
| Number | Date | Country | Kind |
|---|---|---|---|
| 113147322 | Dec 2024 | TW | national |
