KR-20260064288-A - DISPLAY DEVICE

KR20260064288AKR 20260064288 AKR20260064288 AKR 20260064288AKR-20260064288-A

Abstract

The embodiments of the present disclosure relate to a display device, and more specifically, can provide a display device capable of determining whether an input image is a still image without separate dithering information and frame memory, even when the input image data is dithered, by using a representative value of the input image data.

Inventors

서동언
유민재
김재윤

Assignees

엘지디스플레이 주식회사

Dates

Publication Date: 20260507
Application Date: 20241031

Claims (18)

A representative value calculator that receives input image data of a current frame, applies a preset weight to the pixel value of the input image data corresponding to each of a plurality of subpixel groups, and calculates a current representative value corresponding to the current frame by applying different weights to adjacent subpixel groups; and A display device comprising a still image determination unit that determines whether the current frame is a still image by comparing the current representative value with at least one previous representative value corresponding to the previous frame.
In paragraph 1, The above input image data is a display device that is dithered input image data.
In paragraph 1, The above representative value calculator is, A display device that groups a predetermined number of adjacent subpixels among a plurality of subpixels arranged on a display panel, thereby dividing the plurality of subpixels into the plurality of subpixel groups.
In paragraph 1, The above representative value calculator is, A display device that calculates a first color representative value, a second color representative value, and a third color representative value corresponding to the current representative value by applying the preset weights to each of a plurality of first color subpixel groups, a plurality of second color subpixel groups, and a plurality of third color subpixel groups.
In paragraph 1, The above representative value calculator is, A display device that calculates the current representative value by summing the pixel values of the input image data to which the above-mentioned preset weights are applied.
In paragraph 1, The above representative value calculator is, A pixel counter that sequentially counts a plurality of subpixels included in the plurality of subpixel groups and outputs a preset weight corresponding to each of the plurality of subpixels; A multiplier that applies the preset weight output from the pixel counter to each pixel value of the plurality of subpixels included in the input image data; and A display device including an adder that calculates the current representative value by summing the pixel values of the input image data to which the above-mentioned pre-set weights are applied.
In paragraph 1, The above still image determiner is, A display device that compares each of the above current representative value and at least one previous representative value, and determines whether the current frame is a still image based on the result of the comparison.
In Paragraph 7, The above still image determiner is, A display device that determines that the current frame is a still image when the result of the comparison is derived such that the current representative value and at least one previous representative value are identical.
In Paragraph 7, The above still image determiner is, A display device that determines that the current frame is a still image when the result of the comparison is derived such that the current representative value corresponding to the nth frame (where n is a positive integer greater than or equal to 2) among the at least one previous representative value and the representative value corresponding to the mth frame (where m is a positive integer satisfying 2 ≤ m+1 ≤ n-1) are identical to each other, and the difference between each of the representative values corresponding to the m+1th frame to the n-1th frame among the at least one previous representative value and the current representative value is less than a preset threshold value.
In paragraph 1, The above still image determiner is, A display device that outputs a frame skip signal corresponding to at least one frame among the n-th frame and the n+k-th frame (where k is a positive integer greater than or equal to 1) when it is determined that a still image persists during a preset frame period including the current frame, the n-th frame (where n is a positive integer greater than or equal to 2).
In Paragraph 10, The above still image determiner is, A display device that outputs a frame skip signal corresponding to at least one frame determined according to a preset period among the n+k frames.
In Paragraph 10, The above still image determiner is, A display device that outputs a frame skip signal for providing a first polarity control signal provided to a data driving circuit in correspondence with the frame immediately preceding the at least one frame to the data driving circuit in correspondence with the at least one frame.
In Paragraph 10, The above still image determiner is, A display device that outputs a frame skip signal for controlling not to provide image data corresponding to at least one frame to a data driving circuit.
A display panel having multiple data wires and multiple subpixels arranged thereon; A data driving circuit that supplies a data voltage corresponding to image data to the plurality of data lines above; and It includes a controller that controls the data driving circuit and provides the image data to the data driving circuit, The above controller is, A display device that receives input image data corresponding to the above image data, generates a frame skip signal based on the result of image analysis using the above input image data, and provides a polarity control signal corresponding to the frame skip signal to the data driving circuit.
In Paragraph 14, The above controller is, A display device that compares input image data corresponding to the n-th frame (where n is a positive integer greater than or equal to 2) with at least one input image data corresponding to a frame preceding the n-th frame, and generates a frame skip signal corresponding to at least one frame among the n-th frame and the n+k-th frame (where k is a positive integer greater than or equal to 1) according to the result of the comparison.
In paragraph 15, The above controller is, A display device that, according to the above frame skip signal, provides a first polarity control signal provided to the data driving circuit corresponding to the frame immediately preceding the at least one frame to the data driving circuit corresponding to the at least one frame.
In paragraph 15, The above controller is, A display device that determines whether the nth frame is a still image based on the result of the comparison between the current representative value of the input image data of the nth frame and the previous representative value of each of at least one input image data corresponding to the previous frame, and generates the frame skip signal based on the result of the determination of whether it is a still image.
In paragraph 15, The above controller is, A display device that calculates motion information based on the result of the above comparison, and generates the frame skip signal if the motion information is less than a preset motion reference value.

Description

Display Device The embodiments of the present disclosure relate to a display device. As the information society develops and the demand for various devices such as mobile communication terminals and laptop computers increases accordingly, the demand for display devices applied to these devices is also gradually increasing. For example, Liquid Crystal Displays (LCDs) using liquid crystals and OLEDs using Organic Light Emitting Diodes (OLEDs) are being utilized as display devices. Such a display device detects an image output through a display panel and can control the image in various ways in response to the detected result. For example, the display device can change data in response to the type of image (still image and video, etc.) displayed on the display panel. Specifically, the display device may use frame memory to determine whether it is a still image. For example, the display device may store pixel data of the current frame and pixel data of the previous frame in frame memory, and determine whether it is a still image by comparing the stored pixel data of the current frame and pixel data of the previous frame. However, when a display device additionally mounts a frame memory to determine a still image, there is a limitation in that it is difficult to secure a space margin due to the mounting area of the frame memory. FIG. 1 is a drawing for explaining a display device according to embodiments of the present disclosure. FIG. 2 is a drawing for illustrating an example of a subpixel according to embodiments of the present disclosure. FIG. 3 is a drawing for explaining a representative value calculator and a still image determiner equipped in a display device according to embodiments of the present disclosure. FIG. 4 is a drawing for more specifically explaining a representative value calculator equipped in a display device according to embodiments of the present disclosure. FIG. 5 is a drawing for further explaining an example of applying weights in a representative value calculator equipped in a display device according to embodiments of the present disclosure. FIGS. 6 and 7 are drawings for illustrating an example of generating a frame skip signal in a display device according to embodiments of the present disclosure. FIGS. 8 and 9 are drawings for further explaining control operations according to a frame skip signal in a display device according to embodiments of the present disclosure. Hereinafter, some embodiments of the present disclosure will be described in detail with reference to the exemplary drawings. In assigning reference numerals to the components of each drawing, the same components may have the same reference numeral as much as possible, even if they are shown in different drawings. Furthermore, in describing the present disclosure, if it is determined that a detailed description of related known components or functions may obscure the essence of the present disclosure, such detailed description may be omitted. Where terms such as "comprising," "having," or "consisting of" are used in this specification, other parts may be added unless "only" is used. Where a component is expressed in the singular, it may include a plural unless there is a special explicit description otherwise. Additionally, terms such as first, second, A, B, (a), (b), etc., may be used to describe the components of the present disclosure. These terms are used merely to distinguish the components from other components, and the nature, order, sequence, or number of the components are not limited by such terms. In describing the positional relationship of components, where it is stated that two or more components are "connected," "combined," or "joined," it should be understood that while the two or more components may be directly "connected," "combined," or "joined," they may also be "connected," "combined," or "joined" with other components "intervened." Here, the other components may be included in one or more of the two or more components that are "connected," "combined," or "joined" with one another. In describing the temporal flow relationship regarding components, methods of operation, or methods of production, for example, when the temporal or sequential relationship is described using "after," "following," "next," or "before," it may include cases where the relationship is not continuous unless "immediately" or "directly" is used. Meanwhile, where numerical values or corresponding information regarding a component (e.g., levels, etc.) are mentioned, even without separate explicit notation, the numerical values or corresponding information may be interpreted as including a range of error that may occur due to various factors (e.g., process factors, internal or external shocks, noise, etc.). Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the attached drawings. FIG. 1 is a drawing for explaining a display device (100) according to embodiments of the present