This application claims priority to Korean Patent Application No. 10-2021-0160468, filed on Nov. 19, 2021, and all the benefits accruing therefrom under 35 U.S.C. § 119, the content of which in its entirety is herein incorporated by reference.
The present disclosure relates to a display device and a method of driving a display panel by using the same, and more particularly, to a display device and a method of driving a display panel by using the same, capable of variably adjusting a load (or input image data) of an edge region of the display panel according to a difference in a load corresponding to an image displayed on the display panel and/or a load corresponding to a motion value input in each of previous and subsequent frames.
In general, a display device may include a display panel and a display panel driver. The display panel may display an image based on an input image, and may include a plurality of gate lines, a plurality of data lines, and a plurality of pixels. The display panel driver may include a gate driver configured to provide gate signals to the gate lines, a data driver configured to provide data voltages to the data lines, and a driving controller configured to control the gate driver and the data driver.
In many cases, a logo of an image producer, a logo of a broadcaster, or the like may be displayed in an edge region of the display panel, and the logo may be continuously displayed so that an afterimage caused by the logo may remain in the edge region.
Accordingly, the technical aspect of the present disclosure has been made to solve the problems of the related art described above, and one aspect of the present disclosure is to provide a display device capable of variably adjusting a load of an edge region of a display panel according to a difference in a load of the display panel and/or a load corresponding to a motion value input to an image in each of previous and subsequent frames.
Another aspect of the present disclosure is to provide a method of driving a display panel by using the display device.
However, aspects of the present disclosure are not limited to the above-described aspects, and may be variously expanded without departing from the idea and scope of the present disclosure.
To implement one aspect of the present disclosure, according to on embodiment, a display device includes: a display panel, which displays an image; a driving controller, which determines a gain reduction region based on input image data input to the display panel, and generates a data signal by correcting the input image data by applying a gain to at least part of the input image data corresponding to the gain reduction region; and a data driver, which converts the data signal into a data voltage to output the data voltage to the display panel. The data signal includes a first data signal, a second data signal, and a third data signal, the driving controller is configured to: generate the first data signal by correcting first input image data input to a first region of the display panel by applying a first gain value to the first input image data; generate the second data signal by correcting second input image data input to a second region of the display panel by applying a second gain value that is lower than the first gain value to the second input image data; and generate the third data signal by correcting third input image data input to a third region of the display panel by applying a third gain value that is lower than the second gain value to the third input image data. The input image data includes the first input image data, the second input image data, and the third input image data
According to one embodiment, the first region may correspond to a central region of the display panel, the third region may correspond to an outer peripheral region of the display panel, and the second region may correspond to a region between the first region and the third region.
According to one embodiment, the driving controller may be configured to generate the data signal by correcting the input image data by applying the gain to the at least part of the input image data based on a sum of the at least part of the input image data only when a size of the sum of the at least part of the input image data is greater than or equal to a threshold that is a preset size.
According to one embodiment, the driving controller may be configured not to apply the gain when the size of the sum of the at least part of the input image data is less than the threshold.
According to one embodiment, the driving controller may be configured to correct the input image data by applying the gain based on a temperature of the display panel.
According to one embodiment, the driving controller may be configured to: divide the display panel into n blocks (where n is a natural number that is greater than or equal to 2); and correct the input image data by applying the gain based on a part of the input image data input corresponding to m blocks (where m is a natural number that is less than n) selected among the n blocks.
According to one embodiment, the m blocks may be first to m-th blocks selected among the n blocks in an ascending order of a size of the input image data for each block or a representative value of the input image data for each block.
According to one embodiment, the driving controller may be configured not to apply the gain when the size of the input image data of the m blocks is greater than a threshold.
According to one embodiment, the m blocks may be first to m-th blocks selected among the n blocks in a descending order of a size of the input image data for each block or a representative value of the input image data for each block.
According to one embodiment, the n blocks may correspond to n columns, and the m blocks may be selected from blocks corresponding to even-numbered columns or odd-numbered columns among the n columns.
To implement one aspect of the present disclosure, according to on embodiment, a display device includes: a display panel, which displays an image; a driving controller, which determines a gain reduction region based on (N−1)th input image data (where N is a natural number that is greater than or equal to 2) input in an (N−1)th frame of the image displayed on the display panel and Nth input image data input in an Nth frame of the image displayed on the display panel, and generates a data signal by correcting the Nth input image data by applying a gain to at least part of the Nth input image data input in the Nth frame corresponding to the gain reduction region; and a data driver, which converts the data signal into a data voltage to output the data voltage to the display panel. The data signal includes a first data signal, a second data signal, and a third data signal, the driving controller is configured to: generate the first data signal by correcting first partial input image data input to a first region of the display panel in the Nth frame by applying a first gain value to the first partial input image data; generate the second data signal by correcting second partial input image data input to a second region of the display panel in the Nth frame by applying a second gain value that is lower than the first gain value to the second partial input image data; and generate the third data signal by correcting third partial input image data input to a third region of the display panel in the Nth frame by applying a third gain value that is lower than the second gain value to the third partial input image data. The Nth input image data includes the first partial input image data, the second partial input image data, and the third partial input image data.
According to one embodiment, the first region may correspond to a central region of the display panel, the third region may correspond to an outer peripheral region of the display panel, and the second region may correspond to a region between the first region and the third region.
According to one embodiment, the driving controller may be, which correct the input image data by applying the gain only when a difference between a size of input image data input to one region in the (N−1)th frame and a size of input image data input to the one region in the Nth frame is greater than or equal to a preset size.
According to one embodiment, the driving controller may be, which generate the data signal by correcting the input image data based on a sum of the at least part of the input image data only when a size of the sum of the at least part of the input image data is greater than or equal to a threshold that is a preset size.
According to one embodiment, the driving controller may be configured not to apply the gain when the size of the sum of the at least part of the input image data is less than the threshold.
To implement another aspect of the present disclosure, according to on embodiment, a method of driving a display panel includes: calculating input image data input to a display panel; determining a gain reduction region based on the input image data; generating a data signal by correcting the input image data by applying a gain to at least part of the input image data corresponding to the gain reduction region; and converting the data signal into a data voltage to output the data voltage to the display panel. The data signal includes a first data signal, a second data signal, and a third data signal. The first data signal is generated by correcting first input image data input to a first region of the display panel by applying a first gain value to the first input image data, the second data signal is generated by correcting second input image data input to a second region of the display panel by applying a second gain value that is lower than the first gain value to the second input image data, and the third data signal is generated by correcting third input image data input to a third region of the display panel by applying a third gain value that is lower than the second gain value to the third input image data. The input image data includes the first input image data, the second input image data, and the third input image data.
According to one embodiment, the first region may correspond to a central region of the display panel, the third region may correspond to an outer peripheral region of the display panel, and the second region may correspond to a region between the first region and the third region.
According to one embodiment, the data signal may be generated by correcting the input image data based on a sum of the input image data only when a size of the sum of the at least part of the input image data is greater than or equal to a threshold that is a preset size.
According to one embodiment, the gain may not be applied when the size of the sum of the at least part of the input image data or the representative value of the input image data of the m blocks is less than the threshold.
According to one embodiment, the input image data may be corrected by applying the gain based on a temperature of the display panel.
According to one embodiment, the display panel may be divided into n blocks (where n is a natural number that is greater than or equal to 2), and the input image data may be corrected by applying the gain based on a part of the input image data input corresponding to m blocks (where m is a natural number that is less than n) selected among the n blocks.
According to one embodiment, the m blocks may be first to m-th blocks selected among the n blocks in an ascending order of a size of the input image data for each block or a representative value of the input image data for each block.
According to one embodiment, the gain may not be applied when the size of the input image data of the m blocks or the representative value of the input image data of the m blocks is greater than a threshold.
According to one embodiment, the m blocks may be first to m-th blocks selected among the n blocks in a descending order of a size of the input image data for each block or a representative value of the input image data for each block.
According to one embodiment, the n blocks may correspond to n columns, and the m blocks may be selected from blocks corresponding to even-numbered columns or odd-numbered columns among the n columns.
According to one embodiment, the gain reduction region may be determined based on a difference between a size of (K−1)th input image data (where K is a natural number that is greater than or equal to 2) of an (K−1)th frame of an image displayed on the display panel and a size of Kth input image data of an Kth frame of the image displayed on the display panel, and a Kth data signal may be generated by correcting the Kth input image data by applying the gain to the Kth input image data input in at least part of the Kth frame corresponding to the gain reduction region.
To implement one aspect of the present disclosure, according to on embodiment, a display device includes: a display panel, which displays an image; a driving controller, which determines a gain reduction region based on a load of the display panel, and generates a data signal by correcting input image data by applying a gain to at least part of the input image data corresponding to the gain reduction region; and a data driver, which converts the data signal into a data voltage to output the data voltage to the display panel. The data signal includes a first data signal, a second data signal, and a third data signal. The driving controller is configured to: generate the first data signal by correcting first input image data input to a first region of the display panel by applying a first gain value to the first input image data; generate the second data signal by correcting second input image data input to a second region of the display panel by applying a second gain value that is lower than the first gain value to the second input image data; and generate the third data signal by correcting third input image data input to a third region of the display panel by applying a third gain value that is lower than the second gain value to the third input image data. The input image data includes the first input image data, the second input image data, and the third input image data.
To implement one aspect of the present disclosure, according to on embodiment, a display device includes: a display panel, which displays an image; a driving controller, which determines a gain reduction region based on a difference between a first load in an (N−1)th frame (where N is a natural number that is greater than or equal to 2) of the image displayed on the display panel and a second load in an Nth frame of the image displayed on the display panel, and generates a data signal by correcting Nth input image data by applying a gain to the Nth input image data input in at least part of the Nth frame corresponding to the gain reduction region; and a data driver, which converts the data signal into a data voltage to output the data voltage to the display panel. The data signal includes a first data signal, a second data signal, and a third data signal. The driving controller is configured to: generate the first data signal by correcting first partial input image data input to a first region of the display panel in the Nth frame by applying a first gain value to the first partial input image data; generate the second data signal by correcting second partial input image data input to a second region of the display panel in the Nth frame by applying a second gain value that is lower than the first gain value to the second partial input image data; and generate the third data signal by correcting third partial input image data input to a third region of the display panel in the Nth frame by applying a third gain value that is lower than the second gain value to the third partial input image data. The Nth input image data includes the first partial input image data, the second partial input image data, and the third partial input image data.
According to embodiments of the present disclosure, the display device may include: a display panel configured to display an image; a driving controller configured to determine a gain reduction region based on input image data input to the display panel, and generate a data signal by correcting the input image data by applying a gain to the input image data to correspond to the gain reduction region; and a data driver configured to convert the data signal into a data voltage to output the data voltage to the display panel, wherein the driving controller is configured to: generate a first data signal by correcting first input image data input to a first region of the display panel by applying a first gain value to the first input image data; generate a second data signal by correcting second input image data input to a second region of the display panel by applying a second gain value that is lower than the first gain value to the second input image data; and generate a third data signal by correcting third input image data input to a third region of the display panel by applying a third gain value that is lower than the second gain value to the third input image data.
As described above, since the gain is applied, a display defect in which an afterimage remains in the outer peripheral region of the display panel can be prevented.
However, effects of the present disclosure are not limited to the above-described effects, and may be variously expanded without departing from the idea and scope of the present disclosure.
It will be understood that, although the terms “first,” “second,” “third” etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, “a first element,” “component,” “region,” “layer” or “section” discussed below could be termed a second element, component, region, layer or section without departing from the teachings herein.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, “a”, “an,” “the,” and “at least one” do not denote a limitation of quantity, and are intended to include both the singular and plural, unless the context clearly indicates otherwise. For example, “an element” has the same meaning as “at least one element,” unless the context clearly indicates otherwise. “At least one” is not to be construed as limiting “a” or “an.” “Or” means “and/or.” As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. It will be further understood that the terms “comprises” and/or “comprising,” or “includes” and/or “including” when used in this specification, specify the presence of stated features, regions, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, components, and/or groups thereof. Hereinafter, embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. The same or similar reference numerals will be used for the same elements in the accompanying drawings.
Referring to
In an embodiment, for example, the driving controller 200 and the data driver 500 may be integrally formed. For example, the driving controller 200, the gamma reference voltage generator 400, and the data driver 500 may be integrally formed. A driving module in which at least the driving controller 200 and the data driver 500 are integrally formed may be referred to as a timing controller-embedded data driver (“TED”).
The display panel 100 may include a display part for displaying an image, and a peripheral part that is adjacent to the display part.
The display panel 100 may include a plurality of gate lines GL, a plurality of data lines DL, and a plurality of pixels electrically connected to the gate lines GL and the data lines DL, respectively. The gate lines GL may extend in a first direction D1, and the data lines DL may extend in a second direction D2 intersecting the first direction D1.
The driving controller 200 may receive input image data IMG and an input control signal CONT from an external device (not shown). For example, the input image data IMG may include red image data, green image data, and blue image data. The input image data IMG may include white image data. The input image data IMG may include magenta image data, yellow image data, and cyan image data. The input control signal CONT may include a master clock signal and a data enable signal. The input control signal CONT may further include a vertical synchronization signal and a horizontal synchronization signal.
The driving controller 200 may generate a first control signal CONT1, a second control signal CONT2, a third control signal CONT3, and a data signal DATA based on the input image data IMG and the input control signal CONT.
The driving controller 200 may generate the first control signal CONT1 for controlling an operation of the gate driver 300 based on the input control signal CONT to output the generated first control signal CONT1 to the gate driver 300. The first control signal CONT1 may include a vertical start signal and a gate clock signal.
The driving controller 200 may generate the second control signal CONT2 for controlling an operation of the data driver 500 based on the input control signal CONT to output the generated second control signal CONT2 to the data driver 500. The second control signal CONT2 may include a horizontal start signal and a load signal.
The driving controller 200 may generate the data signal DATA based on the input image data IMG. The driving controller 200 may output the data signal DATA to the data driver 500.
The driving controller 200 may generate the third control signal CONT3 for controlling an operation of the gamma reference voltage generator 400 based on the input control signal CONT to output the generated third control signal CONT3 to the gamma reference voltage generator 400.
The gate driver 300 may generate gate signals for driving the gate lines GL in response to the first control signal CONT1 received from the driving controller 200. The gate driver 300 may output the gate signals to the gate lines GL. For example, the gate driver 300 may sequentially output the gate signals to the gate lines GL. For example, the gate driver 300 may be mounted on the peripheral part of the display panel. For example, the gate driver 300 may be integrated on the peripheral part of the display panel.
The gamma reference voltage generator 400 may generate a gamma reference voltage VGREF in response to the third control signal CONT3 received from the driving controller 200. The gamma reference voltage generator 400 may provide the gamma reference voltage VGREF to the data driver 500. The gamma reference voltage VGREF may have a value corresponding to each data signal DATA.
According to one embodiment of the present disclosure, the gamma reference voltage generator 400 may be disposed in the driving controller 200 or the data driver 500.
The data driver 500 may receive the second control signal CONT2 and the data signal DATA from the driving controller 200, and may receive the gamma reference voltage VGREF from the gamma reference voltage generator 400. The data driver 500 may convert the data signal DATA into an analog data voltage by using the gamma reference voltage VGREF. The data driver 500 may output the data voltage to the data line DL.
Referring to
When the load of the image displayed on the display panel 100 is large, the image may have a high luminance. Therefore, when the load-and-motion calculator 210 calculates the load of the image displayed on the display panel 100, the calculation may be understood as calculation of a luminance of the image.
The driving controller 200 may determine a gain reduction region based on the input image data input to the display panel 100. The driving controller 200 may correct the input image data by applying a gain to part of the input image data corresponding to the gain reduction region. The luminance and the load of the image displayed on the display panel 100 may be set based on the input image data.
The driving controller 200 may apply the gain (that will be described below) to reduce a load of the display panel 100 only when a motion in the image displayed on the display panel 100 is large. The motion may be determined based on an absolute value of a difference between loads input to regions having a large load variation in an (N−1)th frame and an Nth frame (where N is a natural number that is greater than or equal to 2). When the motion of the image displayed on the display panel 100 is large (e.g., when a movement of a character displayed on the display panel 100 is large, when a movement of an object (a vehicle, etc.) displayed on the display panel 100 is large, etc.), a load difference may be large for each region of images displayed in the Nth frame and the (N−1)th frame among images displayed on the display panel 100. In other words, when the motion is large, a load deviation may be large between the (N−1)th frame and the Nth frame.
In a case where the motion is large, even when a load of an outer peripheral region of the display panel 100 is reduced by applying the gain, a difference (darkening of the outer peripheral region) that occurs as the gain is applied may not be visually recognized.
In some embodiments, the driving controller 200 may determine the gain reduction region based on (N−1)th input image data input in the (N−1)th frame and Nth input image data input in the Nth frame. The driving controller 200 may generate the data signal by correcting the Nth input image data by applying the gain to part of the Nth input image data input in the Nth frame corresponding to the gain reduction region.
A preset value may be set based on an average load variation between the Nth frame and the (N−1)th frame. For example, the driving controller 200 may apply the gain when a difference between sums of the loads is greater than the average load variation.
In some embodiments, the driving controller 200 may apply the gain only when a difference between a sum of a first load corresponding to at least one region in the (N−1)th frame and a sum of a second load corresponding to the at least one region in the Nth frame is greater than or equal to a preset value. Although the embodiments have been described above based on the load, the driving controller 200 may determine whether to apply the gain based on the input image data. This will also be applied to the embodiments set forth below.
In an embodiment, for example, the driving controller 200 may compare a sum of a load corresponding to a central region of the display panel 100 in the (N−1)th frame with a sum of a load corresponding to the central region of the display panel 100 in the Nth frame. Thereafter, when a difference between the sums of the loads is greater than or equal to a preset value, the gain may be applied.
The preset value may be set as a value obtained by multiplying a maximum load of the display panel 100 by a predetermined ratio.
The preset size may be set in relation to a minimum load of the display panel 100. The minimum load may be defined as a value at which a contour (e.g., logo) is not visually recognized even when the gain is applied.
Alternatively, the driving controller 200 may determine whether to apply the gain by comparing a sum of a load corresponding to the outer peripheral region of the display panel 100 in the (N−1)th frame with a sum of a load corresponding to the outer peripheral region of the display panel 100 in the Nth frame.
The gain calculator 220 may calculate a gain to be applied to the display panel 100 based on the load and/or the motion. The gain will be described in detail with reference to the drawings that will be described below. In addition, the gain applicator 230 may apply the gain calculated by the gain calculator 220 to the display panel 100.
In some embodiments, the gain calculator 220 may calculate the gain to be applied to the display panel 100 based on various factors. For example, the gain calculator 220 may calculate the gain to be applied to the display panel 100 based only on the load. For another example, the gain calculator 220 may calculate the gain to be applied to the display panel 100 based only on a difference in a load corresponding to a variation in a motion value between input data in previous and subsequent frames. Alternatively, for example, the gain calculator 220 may calculate the gain to be applied to the display panel 100 in consideration of both a load in a specific frame and the difference in the load corresponding to the variation in the motion value according to the input data in the previous and subsequent frames.
Referring to
When the load input to the display panel 100 is large, a screen may be bright. For example, when the load input to the display panel 100 is large, the load of the display panel 100 may be high. In this case, when the gain is applied, darkening of an outer peripheral region of the image displayed on the display panel 100 may be visually recognized. Therefore, the gain may be set as 1 as shown in (b) of
In a case where the load input to the display panel 100 is small, when the gain is applied, the darkening of the outer peripheral region in the image displayed on the display panel 100 may be visually recognized relatively less than the above case (a case where the load is large). Therefore, in the case where the load input to the display panel 100 is small, it may be desirable to apply the gain. In the case where the load input to the display panel 100 is small, the load of the display panel 100 may be low.
In a case where the motion of the image displayed on the display panel 100 is large, attention may be focused on the motion. In this case, even when the gain is applied, the darkening of the outer peripheral region may not be visually recognized. In a case where the motion of the image displayed on the display panel 100 is small, when the gain is applied, the darkening of the outer peripheral region may be visually recognized relatively more than in the above case.
The driving controller 200 may apply the gain to the display panel 100 only when a difference between a value of a load corresponding to a motion value according to input image data in the (N−1)th frame and a value of a load corresponding to a motion value according to input image data of the Nth frame is greater than or equal to a preset value. At this point, the driving controller 200 may apply the gain in consideration of an overall load input to the display panel 100. In this case, N may be a number that is greater than or equal to 2.
As described above, the gain may be differently set so as to be applied to the display panel 100 according to the load input to the display panel 100 and/or the motion of the image displayed on the display panel 100.
In
Motion threshold values may be set based on a difference between a sum of a load of an entire region (or one region) input corresponding to the (N−1)th frame and a sum of a load of an entire region (or one region) input corresponding to the Nth frame. For example, the motion threshold values may be set as a predetermined ratio with respect to a sum of a maximum load of the entire region (or one region) of the display panel 100.
A motion that is a difference in a sum of loads input corresponding to images in the previous and subsequent frames may be defined as a difference between a sum of a load of input image data displayed on the display panel 100 in the (N−1)th frame and a sum of a load of input image data displayed on the display panel 100 in the Nth frame.
When the minimum gain value becomes excessively low, a load difference between the central region and the outer peripheral region of the display panel 100 may be increased, so that the minimum gain value may desirably converge to a predetermined value. For example, a minimum value of the minimum gain value may be 0.7.
Although a maximum value of the minimum gain value has been described as being 1, since the above configuration has been provided for illustrative purposes, the embodiments are not limited thereto. In another embodiment, for example, the maximum value of the minimum gain value may be less than 1. A case where the minimum gain value is 1 may be construed as a case where the gain is not applied.
Although the minimum gain value has been shown as having a predetermined slope according to a section, since the above configuration has been provided for illustrative purposes, the embodiments are not limited thereto. For example, the minimum gain may be changed in a curved shape according to a section.
In
Load threshold values may be set by various criteria. For example, the load threshold values may be set as a predetermined ratio with respect to a maximum load input to the display panel 100. According to one example, the predetermined ratio may be defined as an offset with respect to a maximum gray level of the display panel 100.
Alternatively, the load threshold values may be set based on a region of the display panel 100 that has a greatest load. For example, when the display panel 100 is divided into 16 regions, due to one region having a greatest load, the darkening of the outer peripheral region of the display panel 100 may not be visually recognized even when the gain is applied. Therefore, the load threshold values may be set by applying the above schemes based on the one region.
When the minimum gain value becomes excessively low, the load difference between the central region and the outer peripheral region of the display panel 100 may be increased, so that the minimum gain value may desirably converge to a predetermined value. For example, a minimum value of the minimum gain may be about 0.6.
Although a maximum value of the minimum gain has been described as being 1, since the above configuration has been provided for illustrative purposes, the embodiments are not limited thereto. For example, the maximum value of the minimum gain value may be less than 1. The case where the minimum gain value is 1 may be construed as the case where the gain is not applied.
Although the minimum gain value has been shown as having a predetermined slope according to a section, since the above configuration has been provided for illustrative purposes, the embodiments are not limited thereto. For example, the minimum gain value may be changed in a curved shape according to a section.
Referring to
Referring to
The gain may be variously set. As shown in
The driving controller 200 may determine the gain reduction region based on the load and/or the motion of the display panel 100. The gain reduction region may be defined as regions that are gradually darkened from a bright region of the central region. The driving controller 200 may correct a gray level of input image data corresponding to the gain reduction region. In this case, the driving controller 200 may correct the gray level of the input image data by applying the gain to the input image data.
Referring to
In some embodiments, the load may be set based on a sum of the load of the entire region of the display panel 100. Alternatively, in some embodiments, the load may be set based on loads of m blocks among total n blocks obtained by dividing the display panel 100 into the n blocks. For another example, the load may be set based on a sum of the loads of the m blocks or a representative value of the loads of the m blocks. Examples of the representative value of the load include an average luminance (average luminance in a block), an average load (a sum of the input image data), a representative value of each of the blocks (an average of the input image data), and the like. Alternatively, the load may be set as a median value of the m blocks. In this case, n is a natural number that is greater than or equal to 2, and m is a natural number that is less than n. For example, the m blocks may represent first to m-th blocks selected among the n blocks in an ascending order of an average luminance or an average load for each block. Alternatively, the m blocks may be first to m-th blocks selected among the n blocks in an ascending order of a representative value for each block. In another embodiment the m blocks may be selected according to various criteria.
Referring to
Here, the first load threshold L_TH1 of
That is, when the value of the load of the display panel 100 is less than or equal to a preset value, the driving controller 200 may not apply the gain. In other words, when the load input to the display panel 100 has a value that is less than a predetermined threshold, the gain may be set as the off-gain value.
In some embodiments, the load may be set based on the average luminance (the block average luminance), the average load (the sum of the input image data), or the representative value of each of the blocks (the average of the input image data) of the m blocks among the n blocks obtained by dividing the display panel 100 into the n blocks. Alternatively, the load may be set as the median value of the m blocks. In this case, n is a natural number that is greater than or equal to 2, and m is a natural number that is less than n. The m blocks may represent the first to m-th blocks selected among the n blocks in the ascending order of the average luminance or the average load for each block. Alternatively, the m blocks may be first to m-th blocks selected among the n blocks in the ascending order of the representative value for each block. In another embodiment, the m blocks may be selected according to various criteria.
In some embodiments, the load may be determined based on a region having a minimum load among a plurality of regions of the display panel 100. For example, in a case where the display panel 100 is divided into 16 columns, and a sum of a load or a representative value of a load in a darkest region among the 16 columns is less than or equal to a preset value, when the gain is applied to the darkest region, the contour may be visually recognized from an outside. Therefore, the driving controller 200 may not apply the gain.
Alternatively, in some embodiments, the m blocks may be first to m-th blocks selected among the n blocks in a descending order of the load for each block. For example, in a case where one column among the 16 columns has a load that is greater than or equal to a predetermined value, even when the gain is applied to remaining columns, due to the load of the one column, the contour may not be visually recognized. Therefore, the driving controller 200 may apply the gain to the display panel 100.
According to the above embodiments, when the n blocks are arranged in n columns, the application may be performed based on blocks selected from blocks corresponding to even-numbered columns or blocks corresponding to odd-numbered columns. In this case, it may be unnecessary to perform determination for all the columns. Therefore, the driving controller 200 may be operated in a relatively simple manner.
As described above, when a gain is applied for each case according to a load, the contour may not be visually recognized even at a low luminance as shown in (a) of
Referring to
In an embodiment, for example, when the display panel 100 displays an image that is deformed in a gradation shape along left and right sides, deterioration on the right side may be more severe than deterioration on the left side. The driving controller 200_1 may apply the gain when a temperature of the right side rises to a preset temperature or more. Accordingly, the display panel 100 may be prevented from being damaged by the deterioration.
Referring to
As used in connection with various embodiments of the disclosure, each of the load-and-motion calculator 210, the gain calculator 220, the gain applicator 230, the temperature calculator 240 and the gamma reference voltage generator 400 may be implemented in hardware, software, or firmware, for example, implemented in a form of an application-specific integrated circuit (ASIC) or a microprocessor.
Although exemplary embodiments of the present disclosure have been described above, it will be understood by those of ordinary skill in the art that various changes and modifications can be made to the present disclosure without departing from the idea and scope of the present disclosure as set forth in the appended claims.
The present disclosure may be applied to various display devices and a method of driving a display panel by using the same. For example, the present disclosure may be applied to various display devices such as display devices for vehicles, ships, and aircraft, portable communication devices, display devices for exhibition or information transmission, and medical display devices.
Although exemplary embodiments of the present disclosure have been described above, it will be understood by those of ordinary skill in the art that various changes and modifications can be made to the present disclosure without departing from the idea and scope of the present disclosure as set forth in the appended claims.
Number | Date | Country | Kind |
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10-2021-0160468 | Nov 2021 | KR | national |