TWI408968B - Method of improving motion blur of display and display thereof - Google Patents

Abstract

For improving introduced flickers while using black frame insertion technology on a display, each motion image luminance functions for respectively displaying light sub-frames or dark sub-frames, which are used for the black frame insertion technology, is respectively determined according to two motion image luminance sub-functions, which are respectively corresponding to optimization of motion blurs and optimization of flickers. By determining a ratio of both the motion image luminance sub-functions in each the motion image luminance function, both light sub-frames and dark sub-frames having gradually-adjusted luminance may be generated, and as a result, the flickers are relieved so as to improve image displaying quality.

Description

Method and display for improving display smear phenomenon

The invention discloses a method for improving display smear phenomenon and related display, in particular to a display method for determining a smear phenomenon by determining a ratio between two dynamic image brightness sub-functions included in a dynamic image brightness function And related displays.

A general display panel includes a liquid crystal panel and an Organic Light Emitting Diode (OLED) panel, and these display panels often exhibit poor quality in displaying dynamic images. The main cause of the above phenomenon is insufficient reaction speed. In general, the use of the steady-state (Hold-type) illumination method of the display panel also produces a smear (Motion Blur). Phenomenon, which reduces the dynamic image quality of the display panel. Please refer to FIG. 1 , which is a graph showing the relationship between time and brightness when a general display panel operates in a steady state illumination mode. The solid line shown in FIG. 1 is a curve when a general display panel emits light in a steady state, and the broken line represents a brightness perceived by a human human eye when the display panel is displayed in a steady state, wherein the first image transmits a display screen. The frame frequency used is assumed to be 60 Hz. Observing the first picture, it can be found that the human eye automatically integrates the perceived brightness change, which causes the human eye to easily feel the brightness left by the previous frame and cause visual persistence, and the brightness of the actual display of the display panel is generated. The superposition effect, so the naked eye will feel the phenomenon of smear.

In order to solve the problem of the smear phenomenon which occurs when the display panel is displayed in a steady-state light-emitting manner, a pulse-type illuminating method is applied to a general display panel. Please refer to FIG. 2 , which is a diagram showing the relationship between time and brightness when the general display panel operates in a pulsed mode, wherein the frame frequency used for displaying the screen is assumed to be the same 60 Hz as in FIG. 1 . The solid line shown in FIG. 2 is a curve when a general display panel emits light in a pulse pattern, and the broken line represents a brightness perceived by a human human eye when the display panel is displayed in a pulse form, and the general display panel is performed in a pulse form. When the light is displayed, the average brightness perceived by the human eye is closer to the actual brightness of the display panel, and thus the smear phenomenon generally does not occur.

The general pulse type illumination method mainly includes a black frame insertion technology (Black Frame Insertion Technology). The main feature of the black insertion technology is to change the frame of the original frame frequency to the continuous transmission of two sub-frames (Sub-frame) with double frame rate (Double Frame Rate). The sub-frame picture is a black picture.

Please refer to Figures 3 and 4. Figure 3 is a simplified schematic diagram of replacing a single frame picture with two adjacent sub-frame pictures for display using the black insertion technique. In Fig. 3, there are three frame pictures F(n), F(n+1), and F(n+2) to represent three frames continuously displayed in three consecutive time points. surface. Each frame of the picture corresponds to two subframe pictures, for example, the frame picture F(n) corresponds to the subframe pictures F(n)_1 and F(n)_2, and the frame picture F(n+1) corresponds to the subframe. The pictures F(n+1)_1 and F(n+1)_2 and the frame picture F(n+2) correspond to the subframe pictures F(n+2)_1 and F(n+2)_2. Sub-frame pictures F(n)_1, F(n+1)_1, F(n+2)_1 contain images of frame pictures F(n), F(n+1), F(n+2), respectively. The brightness will be higher than that of the frame pictures F(n), F(n+1), F(n+2) to avoid inserting the sub-frame pictures F(n)_2, F(n+1)_2, F(( After n+2)_2, the brightness is not as good as the brightness of the frame pictures F(n), F(n+1), F(n+2); the sub-frame pictures F(n)_2, F(n+1)_2, F (n+2)_2 corresponds to a black sub-frame picture (ie, a black picture) that is blacked out in the frame pictures F(n), F(n+1), and F(n+2), and the sub-frame picture F ( n)_2, F(n+1)_2, F(n+2)_2 brightness is not necessarily all black, it will be based on each frame picture F(n), F(n+1), F(n+2 The brightness is determined, and its brightness is lower than the brightness of the frame pictures F(n), F(n+1), F(n+2).

Fig. 4 is a schematic diagram showing the brightness used in each frame picture and sub-frame picture shown in Fig. 3; wherein frames of frame pictures F(n), F(n+1), F(n+2) are displayed. The frequency is assumed to be 60 Hz, and the sub-frame pictures F(n)_1 and F(n)_2, F(n+1)_1 and F(n+1)_2, F(n+2)_1 are displayed by the black insertion technique. The frame frequency with F(n+2)_2 is assumed to be 120 Hz which is twice the frequency of 60 Hz. Looking at Figure 4, it can be found that the black sub-frame pictures F(n)_2, F(n+1)_2, and F(n+2)_2 are all in the corresponding frame pictures F(n), F(n+1). ), F(n+2) is a lower-brightness sub-frame picture; and each black sub-frame picture must be sandwiched between two brighter sub-frame pictures, so that the display panel is twice the original frame frequency and The dark and dark sub-frame pictures are displayed, and thereby the smear phenomenon as described above is improved.

However, as shown in FIG. 4, since the display of a single frame picture is performed by simultaneously displaying a picture of two sub-frames of one bright and one dark, it is easy for the naked eye to clearly perceive the difference in brightness of the picture, that is, a so-called flicker phenomenon (Flicker) ). In this way, although the black insertion improves the smear phenomenon, the quality of the display image is still lowered because of the introduction of the flicker phenomenon.

The prior art further discloses another method for improving the quality of a display picture by inserting black technology. In this method, a function representing the relationship between the average grayscale value of the frame picture and the brightness is split into two sub-functions. Please refer to FIG. 5, which is a schematic diagram of disassembling a function representing the relationship between the average grayscale value and the brightness of a frame picture into two sub-functions when the black insertion technique is applied in the prior art. In Fig. 5, the relationship between the average grayscale value and the brightness of the frame picture is established as an original dynamic image brightness function f(g) and stored in a lookup table; where g is the average gray level of a frame picture. The value of the original dynamic image brightness function f(g) is the brightness corresponding to the average gray level value g; for those familiar with the display related field, the original dynamic image brightness function f(g) is a gamma curve (Gamma Curve), so its definition will not be repeated. The original dynamic image brightness function f(g) is split into two different dynamic image brightness sub-functions f1(g) and f2(g) according to the different values of the gray level value g, wherein the dynamic image brightness sub-function f1 ( g) represents a function with a higher brightness, and the dynamic image brightness sub-function f2(g) represents a function with a lower brightness to simulate the image of the dynamic image brightness sub-functions f1(g) and f2(g). The brightness is closer to the brightness of the image relative to the original dynamic image brightness function f(g); in the effective interval 0 to S of the average gray level value g shown in Fig. 5, the dynamic image brightness subfunction f1(g) is F2(g) has no intersection. In the example shown in Fig. 5, the original dynamic image brightness function f(g) is split into the dynamic image luminance sub-functions f1(g) and f2(g) according to the average grayscale value n, and with the average grayscale value The value of n is different, and the original dynamic image brightness function f(g) is also disassembled into dynamic image brightness sub-functions f1(g) and f2(g) of different tracks, wherein the dynamic image brightness sub-function f1(g) corresponds to The sub-frame picture with brighter brightness when the pixel is displayed, and the dynamic image brightness sub-function f2(g) corresponds to the sub-frame picture with darkness when the pixel is displayed or the black sub-frame picture described above. However, as can be seen from Fig. 5, even if the sub-function described in Fig. 5 is used to perform black insertion when displaying a picture, the adjacent sub-frame pictures of two consecutive playbacks still have a fairly significant brightness difference in most cases. , such as when the average grayscale value g is equal to n, dynamic shadow The difference between the luminance sub-functions f1(g) and f2(g) is extremely large, which causes flicker on the display.

In view of this, it is necessary to provide a method and related display for improving the smear phenomenon of the display.

The present invention discloses a method of improving the smear phenomenon of a display. The method includes the following steps: counting grayscale value information of all pixels of each frame picture; generating a ratio according to the grayscale value information; determining a first dynamic image brightness according to the ratio and a first dynamic image brightness function formula a function, and determining a second motion picture brightness function according to the ratio and a second motion picture brightness function formula; generating a first subframe picture data according to each frame picture data and the first motion picture brightness function; a frame data and a second motion picture brightness function generate a second subframe picture data; and display a first subframe picture according to the first subframe picture data, and display a first frame according to the second subframe picture data Two sub-frame pictures. The first dynamic image brightness function formula is F1( g )= x . f 1( g )+(1- x ). f 1( g )'. The second dynamic image brightness function formula is F2( g )= x . f 2( g )+(1- x ). f 2( g )'. x represents the ratio. F1(g) represents the first dynamic image brightness function. F2(g) represents the second dynamic image brightness function. F1(g) and f2(g) represent a first motion picture luminance sub-function and a second dynamic which are used to decompose one of the original motion picture brightness functions used when displaying one frame according to a first predetermined average gray level value. Image brightness subfunction. The first motion image luminance sub-function f1(g) and the second motion image luminance sub-function f2(g) have no intersections within one of the effective grayscale values of the original motion image luminance function. The brightness of the first motion picture luminance sub-function f1(g) is higher than the brightness of the second motion picture brightness sub-function f2(g). F1(g)' and f2(g)' represent a third motion image luminance sub-function-fourth motion image luminance sub-function that is used to decompose the original motion image luminance function according to the first predetermined average grayscale value. The third dynamic image luminance sub-function f1(g)′ and the fourth dynamic image luminance sub-function f2(g)′ have intersections only on the first predetermined grayscale value within the effective grayscale value range.

A display includes a pixel statistics module, a ratio generation module, a first motion image brightness function module, a second motion image brightness function module, and a display panel. The pixel statistics module is used to count the grayscale value information of all pixels of each frame. The ratio generation module is configured to generate a ratio based on grayscale value information of all pixels of each frame of the picture. The first dynamic image brightness function module includes a first dynamic image brightness function formula. The first motion picture brightness function module is configured to determine a first motion picture brightness function according to the ratio, and further generate a first subframe picture data according to each frame picture data and the first motion picture brightness function. The second dynamic image brightness function module includes a second dynamic image brightness function formula. The second dynamic image brightness function module is configured to determine a second dynamic image brightness function according to the ratio, and further generate a second subframe picture data according to the frame data of each frame and the second dynamic image brightness function. The display panel displays the first subframe picture according to the first subframe picture data and displays the second subframe picture according to the second subframe picture data. The first dynamic image brightness function formula is F1( g )= x . f 1( g )+(1- x ). f 1( g )'. The second dynamic image brightness function formula is F2( g )= x . f 2( g )+(1- x ). f 2( g )'. x represents the ratio. F1(g) represents the first dynamic image brightness function. F2(g) represents the second dynamic image brightness function. F1(g) and f2(g) represent a first motion picture luminance sub-function and a second dynamic which are used to decompose one of the original motion picture brightness functions used when displaying one frame according to a first predetermined average gray level value. Image brightness subfunction. The first motion image luminance sub-function f1(g) and the second motion image luminance sub-function f2(g) have no intersection within one of the effective grayscale values of the original motion image luminance function. The brightness of the first motion picture luminance sub-function f1(g) is higher than the brightness of the second motion picture brightness sub-function f2(g). F1(g)' and f2(g)' represent a third motion image luminance sub-function-fourth motion image luminance sub-function that is used to decompose the original motion image luminance function according to the first predetermined average grayscale value. The third motion image luminance sub-function f1(g)′ and the fourth motion image luminance sub-function f2(g)′ have an intersection only on the first predetermined grayscale value within the effective grayscale value range.

Compared with the prior art, the method for improving the smear phenomenon of the display and the related display disclosed by the present invention not only can directly improve the smear phenomenon of the display, but also improve the introduction of flicker phenomenon when the display adopts the black insertion technology in the prior art. The problem. In the method disclosed by the present invention, the dynamic image brightness functions for displaying the bright sub-frame picture and the dark sub-frame picture for black insertion are each cut into two dynamic image brightness sub-functions. By counting the number of pixels with lower grayscale values in a single frame picture, the ratio of the two dynamic image brightness sub-functions in the dynamic image brightness function can be determined, and the bright sub-frames and darkness in which the brightness is smoothly changed are output accordingly. Sub-frame picture, while reducing flicker, to achieve image display quality optimization.

Please refer to FIG. 6 , which is a schematic diagram showing a manner of cutting a gamma curve used in the black insertion technique to avoid flicker. As shown in Figure 6, the original motion picture brightness function f(g) is cut with the average gray level value n and cut into the dynamic image brightness sub-functions f1(g)' and f2(g)', dynamic image brightness. The sub-frame picture F(n)_1 corresponding to the sub-function f1(g)' contains the image of the frame picture F(n) corresponding to the original moving picture brightness function f(g), and the dynamic image brightness sub-function f2(g)' The corresponding sub-frame picture F(n)_2 is a black sub-frame picture (ie, a black picture) that is blacked out in the frame picture F(n). As shown in Fig. 6, when the value of the average grayscale value g is less than n, the luminance of the sub-frame picture corresponding to the dynamic image luminance sub-function f1(g)' is higher than the dynamic image luminance sub-function f2(g)' The brightness of the corresponding sub-frame picture; and when the value of the average gray-scale value g is greater than n, the brightness of the sub-frame picture corresponding to the dynamic image brightness sub-function f1(g)' is lower than the dynamic image brightness sub-function f2(g)' The brightness of the corresponding sub-frame picture.

According to Fig. 6, the motion picture luminance sub-functions f1(g)' and f2(g)' have an intersection point at the gray-scale value n such that the motion picture luminance sub-function f1(g)' The difference in luminance between the two and the f2(g)' has a smaller luminance difference in the interval of the average grayscale value from n1 to n2, that is, the difference in luminance between adjacent two subframes is small, and thus the first The flicker phenomenon that will occur in Figure 5 is greatly improved. Please note that the settable range of the average grayscale value n shown in FIG. 6 may vary depending on the display panel of the display, for example, 0 to 255 (that is, the value of the grayscale value S is 255). ), but it can also be adjusted to a range of less than 0 to 255. After setting n, n is fixed, so n does not change automatically when the display is working, but the user can still reset the value of n within the settable range of n according to his personal preference and the usage of the display. In the ideal state, the value of n is approximately half of S, n1 is approximately half of n, and n2 is approximately the average of n and S, so that in most of the display conditions, the blinking condition of the display can be avoided.

The present invention further discloses a method of improving the smear phenomenon to optimize the display condition of the display.

Please refer to FIG. 7, which is a schematic diagram of a display 100 for implementing the method for determining a dynamic image brightness function disclosed in the present invention. As shown in FIG. 7, the display 100 includes a pixel statistics module 110, a ratio generation module 120, a first motion image brightness function module 130, a second motion image brightness function module 140, and a display. Panel 150.

The pixel statistics module 110 is configured to detect gray scale values used by each of the plurality of pixels included in each frame of the frame received by the display 100 to generate gray scales of the plurality of pixels included in the frame image. The grayscale value statistical curve of the value. The pixel statistics module 110 may detect, according to the grayscale value statistical curve, the total number of pixels of all the pixels whose grayscale value is less than a predetermined grayscale value y in the frame image, and determine the detected Whether the total number of pixels is less than a critical number of pixels z to determine the value of a ratio x, wherein the manner of detecting or judging will be explained later when the operation of the ratio generation module 120 is introduced.

Please refer to Figure 8 and Figure 9, which is the pixel statistics shown in Figure 7. A schematic diagram of a simplified example of two gray scale value statistical curves generated by the module 110. For example, the gray-scale value statistical curve shown in FIG. 8 indicates that in a single frame picture, there are a total of a pixels with a gray-scale value of y, and a gray-scale value of (y+Δy). There are (a + △ s1) in total, and there are (a - △ s2) pixels in the gray scale value (y - Δy); the gray scale value statistical curve shown in Fig. 9 is expressed in In a single frame picture, there are a total of b pixels with a grayscale value of y, and a total of (b+Δs3) pixels with a grayscale value of (y+Δy), and the grayscale value is (y-Δy). There are a total of (b-△s4) pixels.

The first dynamic image brightness function module 130 stores a dynamic image brightness function F1(g), and the dynamic image brightness function F1(g) is based on the dynamic image brightness sub-functions f1(g) and 6 shown in FIG. The ratio x between the dynamic image luminance sub-functions f1(g)' shown in the figure is determined by the ratio generation module 120.

Please refer to FIG. 10, which is to determine the ratio x between the motion picture luminance sub-function f1(g) shown in FIG. 5 and the motion picture luminance sub-function f1(g)' shown in FIG. 6 to generate a motion picture. The luminance function F1(g) is a schematic diagram specifically illustrated by a function curve. As shown in Figure 10, the five paths indicated by A, B, C, D, and E represent at least five possible ratios between the dynamic image luminance subfunctions f1(g) and f1(g)'. The value and the trajectory of the dynamic image brightness function F1(g) that may be generated. When the dynamic image brightness function F1(g) is expressed in algebra, it can be further expressed as follows: F1( g )= x . f 1( g )+(1- x ). f 1( g )'(1); x is the ratio of the dynamic image luminance sub-function f1(g) in the dynamic image luminance function F1(g), and (1-x) is f1(g)' The ratio in the dynamic image brightness function F1(g). In other words, when the value of the ratio x is 0, the output dynamic image luminance function F1(g) is the dynamic image luminance sub-function f1(g)' represented by the E path; and when the ratio x is 1, the output dynamics The image brightness function F1(g) is the dynamic image brightness sub-function f1(g) represented by the A path.

Similarly, the second dynamic image brightness function module 140 stores a dynamic image brightness function F2(g), and the dynamic image brightness function F2(g) is based on the dynamic image brightness sub-function f2(g) shown in FIG. This is determined by a ratio between the dynamic image luminance sub-function f2(g)' shown in FIG. 6, that is, the ratio x determined by the ratio generation module 120. Please refer to FIG. 11 , which is a schematic diagram illustrating the function of the dynamic image luminance sub-function f2(g) and f2(g)′ to determine the dynamic image brightness function F2(g). In Figure 11, the different paths A, B, C, D, E also correspond to at least five possible ratios between the dynamic image luminance sub-functions f2(g) and f2(g)' and possible The trajectory of the dynamic image brightness function F2(g). The dynamic image luminance sub-function F2(g) can be expressed as follows: F2( g )= x . f 2( g )+(1- x ). f 2( g )' (2)x is the ratio of the dynamic image luminance subfunction f2(g) in the dynamic image luminance function F2(g), and (1-x) is the motion image luminance subfunction f2 (g) 'The ratio of the dynamic image brightness function F2(g). For example, when the value of the ratio x is 0, the output dynamic image luminance function F2(g) is the dynamic image luminance sub-function f2(g)' represented by the E path; and when the ratio x is 1, The output dynamic image brightness function F2(g) is the dynamic image brightness sub-function f2(g) represented by the A path.

The ratio generation module 120 determines the value of the ratio x based on the grayscale value curve and the number of critical pixels z counted by the pixel statistics module 110. It can be seen from the above formulas (1) and (2) that in the case where the motion image luminance sub-functions f1(g), f1(g)', f2(g), and f2(g)' are known, the ratio x It is used to adjust the ratio of the dynamic image brightness sub-functions f1(g) and f1(g)' in the dynamic image brightness function F1(g), and is used to adjust the dynamic image brightness sub-function f2 in the dynamic image brightness function F2(g). (g) and f2(g)' respective ratios.

The purpose of determining the ratio x includes two: the first purpose is that when a certain frame picture has more low gray scale value pixels (as in the case of Fig. 8), the naked eye is less sensitive to the flicker phenomenon, and the smear phenomenon becomes More problematic to deal with, because the flicker phenomenon caused by Figure 5 is lower in the case of lower average grayscale value Not serious, so the smear phenomenon can be solved by the method shown in Fig. 5; by increasing the value of the ratio x to increase the dynamic image brightness sub-function f1(g) in the dynamic image brightness function F1(g) Proportion, and increase the ratio of the dynamic image brightness sub-function f2(g) in the dynamic image brightness function F2(g); in other words, the ratio (1-x) is turned down, and the dynamic image brightness sub-function f1(g)' is dynamic The ratio of the image brightness function F1(g) is reduced, and the proportion of the dynamic image brightness sub-function f2(g)' in the dynamic image brightness function F2(g) is also reduced; thus, the continuous playback corresponds to the motion picture. In the case of a first subframe picture of the luminance function F1(g) and a second subframe picture corresponding to the motion picture luminance function F2(g), since the gray scale value of most pixels of the frame picture is low, The flickering phenomenon does not cause trouble to the user, and the smear phenomenon is solved because the present embodiment is closer to the display method of Fig. 5. The second purpose is to have a low-gradation value pixel in a frame and use the black insertion technique. If the average grayscale value is greater than the n1 shown in Figure 6, the flickering phenomenon will cause the user Very much trouble, by reducing the value of the ratio x to reduce the proportion of the dynamic image brightness sub-function f1(g) in the dynamic image brightness function F1(g), and also reducing the dynamic image brightness sub-function f2(g) in the dynamic The ratio in the image brightness function F2(g); in other words, the ratio (1-x) is increased to increase the ratio of the dynamic image luminance sub-function f1(g)' in the dynamic image brightness function F1(g), and the motion image is added. The ratio of the luminance sub-function f2(g)' in the dynamic image brightness function F2(g); thus, the first sub-frame picture corresponding to the dynamic image brightness function F1(g) is continuously played and corresponds to the dynamic image brightness function In the case of the second sub-frame picture of F2(g), the flicker phenomenon can be avoided with a small brightness difference as the dynamic image brightness functions F1(g) and F2(g) shown in FIG. For example, if the average grayscale value of a frame of the frame is 191, the brightness of the two subframes using the original black insertion technique is approximately 255 and 127, and the luminance of the two subframes using the technique of the embodiment is approximately 220. And 170, it is obvious that this embodiment will effectively improve the flicker phenomenon.

The manner in which the ratio x is determined will be described with reference to Figs. 8 and 9. The pixel statistics module 110 stores a predetermined gray scale value y and a critical pixel number z. When the pixel statistics module 110 reads a single frame picture and generates a gray scale value curve as shown in FIG. 8 or FIG. 9, the pixel statistics module 110 will set the gray level value to be smaller than the predetermined gray level value y. The pixel is a pixel with a low grayscale value, and all pixels whose grayscale value is smaller than the predetermined grayscale value y are regarded as pixels having a higher grayscale value. When the grayscale value is less than the predetermined grayscale value y, the number of all pixels (that is, the grayscale value curve, the grayscale value g axis, and the grayscale value y corresponding to the virtual image in Fig. 8 or Fig. 9 When the area covered by the straight line is less than the number of critical pixels z, the pixel statistics module 110 determines that the number of pixels including the low gray level value of the frame picture is excessive, and notifies the ratio generation module 120. Perform the operation of lowering the ratio x as described above to adjust F1(g) toward the direction of f1(g)'; otherwise, when the grayscale value is smaller than the predetermined grayscale value y, the number of all pixels is more than the critical painting. When the number z is primed, the pixel statistics module 110 determines that the number of pixels including the low gray level value of the frame picture is less, and notifies the ratio generation module 120 to perform the operation of increasing the ratio x as described above. F1 (g) is adjusted in the direction of f1 (g).

In the embodiment shown in FIG. 8 and FIG. 9 , although only 0 to 255 is regarded as the effective range of the gray scale value g, in other embodiments of the present invention, the pixel statistics module 110 may also be based on The display 100 counts the number of pixels of different grayscale value ranges according to different actual requirements of the specifications. For example, only the number of pixels corresponding to each grayscale value in the grayscale values 50 to 200 can be counted. The predetermined gray scale value y is based on the effective range of the gray scale value g. In other words, in the eighth graph and the ninth graph, the predetermined gray scale value y may be 0 to 255 (but not equal to 0) Or any effective grayscale value of 255).

For example, in an embodiment of the present invention, the value of the predetermined grayscale value y can be set to 80, and the number of critical pixels z can be set to the number of all pixels in a single frame picture (that is, the above 8th 70% of the area covered by the grayscale value curve, the axis of the grayscale value g, and the number of pixels on the graph in Fig. 9; thus, when there is more than 70% in a single frame picture Pixel concentration When the left side of the imaginary straight line corresponding to the gray scale value y is predetermined, that is, the condition that the number of all pixels whose gray scale value is smaller than the predetermined gray scale value y is more than the number of critical pixels z, the pixel at this time The statistics module 110 notifies the ratio generation module 120 to perform the operation of increasing the ratio x as described above, so that F1(g) is adjusted according to the direction of formula (1) toward f1(g), and F2(g) is Equation (2) is adjusted toward the direction of f2(g); conversely, when less than 70% of the pixels in the single frame picture are concentrated on the right side of the virtual line corresponding to the predetermined gray level value y, it represents the pixel statistics. The module 110 determines that the frame picture contains a low number of pixels with a low gray level value, and notifies the ratio generation module 120 to perform the operation of lowering the ratio x as described above, so that F1(g) is according to the formula (1). ) is adjusted in the direction of f1(g)', and F2(g) is adjusted in the direction of f2(g)' according to formula (2).

However, according to various embodiments of the present invention, the value of the predetermined grayscale value y may also be considered by the display 100 in terms of different specifications (such as the size of the panel or the required resolution). It is limited to the value mode exemplified above, and the value of the predetermined gray scale value y only needs to be located in the range of the effective gray scale value of the statistical pixel gray scale value in the pixel statistics module 110. The value of the critical pixel number z can be exemplified by a percentage value, for example, 70% of the total number of pixels included in the single frame picture described above.

Please refer to FIG. 12 , which is a flowchart of a method for improving the smear phenomenon and flicker phenomenon of the display according to the present invention. As shown in FIG. 12, the method disclosed in the present invention includes the following steps: Step 202: In a frame picture received by the display 100, the pixel statistics module 110 detects that the displayed grayscale value is less than a predetermined grayscale value. a total number of pixels of all the pixels of y; step 204: The pixel statistics module 110 determines whether the total number of pixels is less than a number of critical pixels z, wherein the number of critical pixels z represents a single picture The predetermined gray number is lower than the predetermined gray level value y of the predetermined number of pixels; when the total number of pixels is less than the critical number of pixels z, step 205 is performed; otherwise, step 208 is performed; Step 205: The ratio generation module 120 determines whether a ratio x is equal to a ratio upper limit (for example, 1 and the ratio x is the ratio used by the previous frame). When the ratio x is not equal to the upper limit of the ratio, step 206 is performed. Otherwise, step 207 is performed; step 206: the ratio generation module 120 increments the ratio x by a unit ratio, and performs step 210; step 207: the ratio generation module 120 keeps the ratio x unchanged, and performs step 210; The ratio generation module 120 confirms whether the ratio x reaches a lower limit of the ratio (for example, 0); when the ratio x does not reach the lower limit of the ratio, step 209 is performed; otherwise, step 207 is performed; step 209: the ratio generation module 120 sets the ratio x Decrementing the unit ratio, and performing step 210; Step 210: The dynamic image brightness function module 130 determines a first motion image luminance sub-function f1 (g) and a second motion image luminance sub-function f1 (g) according to the ratio x a ratio of each of the first dynamic image brightness functions F1(g) to determine a first dynamic image brightness function F1(g); and step 212: the dynamic image brightness function module 140 determines a third according to the ratio x move The ratio of the image brightness sub-function f2(g) and a fourth motion picture brightness sub-function f2(g)' in a second dynamic image brightness function F2(g) to determine the second motion picture brightness function F2 (g); and step 214: the display 100 sequentially displays the first dynamic image brightness function on the display panel 150 according to the determined first dynamic image brightness function F1(g) and the second dynamic image brightness function F2(g). One of the first subframe picture corresponding to F1(g) and the second subframe picture corresponding to the second motion picture brightness function F2(g).

The display method disclosed in the present invention and the display 100 using the same are described in the following with reference to the display 100 shown in FIG. 7 and the flowchart shown in FIG. 12, wherein the components included in the display 100 are The parts that have been exposed in the function are not explained separately.

First, in step 202, the pixel statistics module 110 first detects the grayscale values of all the pixels in the single frame picture received by the display 100 to generate a grayscale value curve as shown in FIG. 8 or FIG. And determining, according to the grayscale value curve, the total number of pixels in the frame picture whose grayscale value is less than the predetermined grayscale value y. Next, in step 204, the pixel statistics module 110 compares the total number of pixels obtained in step 202 with the number of critical pixels z to determine whether the total number of pixels is less than the critical pixel. Number z.

When the pixel statistics module 110 determines in step 204 that the total number of pixels is more than the number of critical pixels, it means that the pixels of the single frame have lower grayscale values, and thus have lower brightness. space. At this time, in step 205, the ratio generation module 120 first determines whether the value of the ratio x used by the display 100 has reached 1 or not. If the ratio x has reached 0, step 207 is performed to maintain the ratio x at 1; If the ratio x has not yet reached zero, then step 206 is performed to increase the ratio x by one unit, and in a preferred embodiment of the invention the unit is 0.01, but in other embodiments of the invention the unit is not limited At 0.01, the visual display 100 is adjusted to the actual needs of the specifications.

When the pixel statistics module 110 determines in step 204 that the total number of pixels is less than the number of critical pixels z, it means that there are more pixels with lower grayscale values in the single frame, so the brightness is improved. space. At this time, in step 208, the ratio generation module 120 first determines whether the value of the ratio x used by the display 100 has reached 0. If the ratio x has reached 0, step 207 is performed to maintain the ratio x at 0; If the ratio x has not yet reached 0, step 206 is performed to reduce the ratio x by one unit, and the value of the unit is the same as the above ratio increase, and no further description is provided here.

When the process proceeds to step 210, the dynamic image brightness function module 130 adjusts the dynamic image brightness sub-functions f1(g), f1(g) according to the ratio x determined by the ratio generation module 120 in steps 206, 207, or 209. 'The ratio of the two in the dynamic image brightness function F1(g) to determine the current trajectory of the dynamic image brightness function F1(g), the way of determining is described in the relevant description of Figure 10, and will not be repeated here. . Similarly, when step 212 is performed, the dynamic image brightness function module 140 adjusts the dynamic image brightness sub-functions f2(g), f2 according to the ratio x determined by the ratio generation module 120 in steps 206, 207, or 209. g) 'The ratio of the two in the dynamic image brightness function F2(g) to determine the current trajectory of the dynamic image brightness function F2(g), the way of determining is also described in the relevant description of Figure 11, so here too Do not repeat the discussion. In addition, at the same time, the ratio x used by the dynamic image brightness function modules 130 and 140 must be the same so that two consecutive subframes are displayed according to the dynamic image brightness functions F1(g) and F2(g). The change in brightness of the picture is relatively flat and not easily detectable by the naked eye.

Finally, when performing step 214, the display 100 sequentially displays a first sub-frame picture and a second sub-frame picture on the display panel 150, wherein the display brightness of the first sub-frame picture is based on the dynamic image brightness function mode. The group 130 is determined by the dynamic image brightness function F1(g) determined in step 210, and the display brightness of the second sub-frame is based on the dynamic image brightness function determined by the dynamic image brightness function module 140 in step 212. F2 (g) determines; in other words, the first subframe picture is a bright subframe picture, and the second subframe picture is a black insertion picture, that is, a dark subframe picture. Referring to FIG. 13, when the step 214 shown in FIG. 12 is performed, the first subframe picture and the second subframe determined to be played are determined corresponding to the motion picture brightness functions F1(g) and F2(g). A function diagram of the brightness of the picture, wherein in Fig. 13, it is assumed that the dynamic image luminance functions F1(g) and F2(g) are determined by the ratio x corresponding to the path D in both the 10th and the 11th. Looking at Figure 13, we can see that when the path D is selected, the gray-scale value g is from 0 to S. In the grayscale value, the difference in brightness between the dynamic image brightness functions F1(g) and F2(g) is not obvious, so that the naked eye does not obviously feel the difference in display brightness, and the flicker when displaying the picture can be lightened accordingly. phenomenon. When the path A, B, C, or E is selected at the same time, the difference in luminance produced does not cause the naked eye to clearly perceive the difference in display brightness.

It is noted that the steps shown in FIG. 12 may be reasonably replaced by other means disclosed in the present invention or other embodiments resulting from the other limitations disclosed above in the present invention, or in FIG. Other embodiments resulting from the reasonable arrangement of the various steps are still considered to be within the scope of the invention.

Please refer to FIG. 14 again, which is a schematic diagram of an ideal process when the ratio generation module 120 shown in FIG. 7 determines the value of the ratio x. As shown in Fig. 14, in the time zone t1, since the number of pixels including lower grayscale values in a single frame picture is large, steps 202, 204, 206, 210, 212, 214 in Fig. 12 are performed many times. The iterative process, such that the ratio x is incremented in the process; and in the time zone t2, since the number of pixels containing lower grayscale values in a single frame picture is small, step 202 in step 12 is performed, The iterative process of 204, 208, 209, 210, 212, 214 causes the ratio x to be decremented in the process. However, when the method described in FIG. 12 is generally applied in the display 100 shown in FIG. 7, the ratio x is usually changed frequently by the increment or decrement thereof, and is not directly as shown in FIG. The lower limit 0 is incremented to the upper limit of 1, or is directly reduced from the upper limit 1 to the lower limit 0. This is because the gray scale value distribution of the pixels included in the single frame picture detected by the pixel measurement module 110 is also Easy to be unstable.

The present invention discloses a display method for determining a dynamic image brightness function and a related display to improve the problem of introducing a flicker phenomenon when the display uses the black insertion technique in the prior art. In the method disclosed in the present invention, the dynamic image brightness functions for displaying the bright sub-frame picture and the dark sub-frame picture for black insertion are each cut into two dynamic image brightness sub-functions. By The number of pixels with lower grayscale values in a single frame picture determines the ratio of the two dynamic image brightness sub-functions in the dynamic image brightness function, and can output a bright sub-picture picture and a dark sub-frame picture in which the brightness is smoothly changed, and Reduce flicker to optimize image display quality.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and those skilled in the art will be able to make equivalent modifications or variations in accordance with the spirit of the present invention. All should be covered by the following patent application.

F(n), F(n+1), F(n+2) ‧‧ frames

F(n)_1, F(n)_2, F(n+1)_1, F(n+1)_2, F(n+2)_1, F(n+2)_2‧‧‧ subframe pictures

F1 (g), F2 (g), f (g) ‧ ‧ dynamic image brightness function

F1(g), f1(g)', f2(g), f2(g)'‧‧‧Dynamic image brightness subfunction

100‧‧‧ display

110‧‧‧ pixel statistical module

120‧‧‧ rate generation module

130, 140‧‧‧Dynamic image brightness function module

150‧‧‧ display panel

202, 204, 205, 206, 207, 208, 209, 210, 212, 214‧ ‧ steps

Fig. 1 is a graph showing the relationship between time and brightness when a general display panel operates in a steady state illumination mode.

Fig. 2 is a graph showing the relationship between time and brightness when a general display panel operates in a pulsed mode.

Figure 3 is a simplified schematic diagram of replacing a single frame picture with two adjacent sub-frame pictures for display using the black insertion technique.

Fig. 4 is a schematic diagram showing the brightness used in each frame picture and sub-frame picture shown in Fig. 3.

FIG. 5 is a schematic diagram of the function of disassembling a function representing the relationship between the gray scale value and the brightness of each pixel in the frame picture into two sub-functions to improve the smear phenomenon when the black insertion technique is applied in the prior art.

Fig. 6 is a schematic view showing the manner of cutting a gamma curve cited in the black insertion technique for improving the flicker phenomenon.

Figure 7 is a schematic diagram of a display embodying the method of improving the smear phenomenon of the display of the present invention.

Fig. 8 and Fig. 9 are schematic diagrams showing a simplified example of two gray scale value statistical curves generated by the pixel statistical module shown in Fig. 7.

Figure 10 is a graph showing the ratio x between the motion picture luminance sub-function f1(g) shown in Fig. 5 and the motion picture luminance sub-function f1(g)' shown in Fig. 6. A schematic diagram specifically illustrated by a function curve when the dynamic image brightness function F1(g) is generated.

Fig. 11 is a view schematically showing a function as a function of determining a ratio between the dynamic image luminance sub-functions f2(g) and f2(g)' to generate a dynamic image luminance function F2(g).

Figure 12 is a flow chart of a method for improving the smear phenomenon of the display disclosed in the present invention.

Figure 13 is a diagram showing the brightness of the first sub-frame picture and the second sub-frame picture played corresponding to the motion picture brightness functions F1(g) and F2(g) when the step 214 shown in Fig. 12 is performed. Function diagram.

Figure 14 is a schematic diagram of an ideal process for the ratio generation module shown in Figure 7 to determine the value of the ratio x.

100‧‧‧ display

110‧‧‧ pixel statistical module

120‧‧‧ rate generation module

130, 140‧‧‧Dynamic image brightness function module

150‧‧‧ display panel

Claims (10)

A method for improving display smear phenomenon, comprising the steps of: a. counting gray scale value information of all pixels of each frame picture; b. generating a ratio according to the gray scale value information; c. according to the ratio and one The first dynamic image brightness function formula determines a first dynamic image brightness function, and determines a second dynamic image brightness function according to the ratio and a second dynamic image brightness function formula; d. according to each frame picture data and the first The dynamic image brightness function generates a first subframe picture data; e. generates a second subframe picture data according to the frame picture data and the second motion picture brightness function; and f. according to the first subframe picture data Displaying a first subframe picture, and displaying a second subframe picture according to the second subframe picture data; wherein the first motion picture brightness function formula is F1( g )= x . f 1( g )+(1- x ). f 1( g )', the second dynamic image brightness function formula is F2( g )= x . f 2( g )+(1- x ). f 2( g )'; where x represents the ratio; g represents the average grayscale value of one frame; F1(g) represents the first dynamic image luminance function; and F2(g) represents the second dynamic image luminance function ;f1(g) and f2(g) represent a first motion picture luminance sub-function and a second which are used to decompose one original picture brightness function used when displaying one frame according to a first predetermined average gray level value; a dynamic image brightness sub-function, and the first moving image brightness sub-function f1(g) and the second moving image brightness sub-function f2(g) have no intersection point within one of the effective gray level values of the original moving image brightness function, The brightness of the first motion picture luminance sub-function f1(g) is higher than the brightness of the second motion picture brightness sub-function f2(g); f1(g)' and f2(g)' represent according to the first predetermined average The grayscale value decomposes the original motion image luminance function into a third motion image luminance subfunction-fourth motion image luminance subfunction, and the third motion image luminance subfunction f1(g)′ and the fourth dynamic The image brightness sub-function f2(g)' is only in the first predetermined gray in the range of the effective gray level value The value of the intersection point. The method for improving the smear phenomenon of the display according to the first aspect of the invention, wherein the step b includes a step g: the grayscale value displayed in the frame picture recorded in the grayscale value information is less than a critical gray. Whether the total number of pixels of all pixels of the order value is less than a critical number of pixels determines the ratio. The method for improving the smear phenomenon of the display according to the second aspect of the patent application, wherein, in the step g, determining, according to a gray scale value statistical curve corresponding to the frame picture, determining that the gray scale value of the display is smaller than the critical gray scale The total number of pixels of all the pixels of the value; wherein the grayscale value information includes the grayscale value statistical curve, and the grayscale value statistical curve records one of the pixels used in displaying the frame in the frame. A grayscale value, and the grayscale value statistical curve corresponds to a grayscale value of each of the plurality of pixels included in the frame picture. The method for improving display smear phenomenon according to claim 2, wherein the step g comprises increasing the ratio by one unit when the total number of pixels is less than the critical number of pixels. The method for improving display smear phenomenon according to claim 2, wherein the step g comprises reducing the ratio by one unit when the total number of pixels is greater than the number of critical pixels. A display comprising: a pixel statistics module, a ratio generation module, a first motion image brightness function module, a second motion image brightness function module, and a display panel, the pixel statistics module For calculating the grayscale value information of all the pixels of each frame, the ratio generation module is configured to generate a ratio according to the grayscale value information of all the pixels of each frame, the first dynamic image brightness function module includes a a first dynamic image brightness function formula, the first dynamic image brightness function module is configured to determine a first dynamic image brightness function according to the ratio, and further generate a first image according to each frame data and the first dynamic image brightness function. a second frame image data, the second motion picture brightness function module includes a second motion picture brightness function formula, and the second motion picture brightness function module is configured to determine a second motion picture brightness function according to the ratio, and further Generating a second subframe picture data according to the frame data of each frame and the second motion picture brightness function, and the display panel draws according to the first subframe Displaying the first sub-frame picture data and the second sub-frame based on the picture data of the second sub-frames, wherein the first dynamic image luminance function formula F1 (g) = x. f 1( g )+(1- x ). f 1( g )'; The second dynamic image brightness function formula is F2( g )= x . f 2( g )+(1- x ). f 2( g )'; where x represents the ratio; g represents the average grayscale value of one frame; F1(g) represents the first dynamic image luminance function; and F2(g) represents the second dynamic image luminance function ;f1(g) and f2(g) represent a first motion picture luminance sub-function and a second which are used to decompose one original picture brightness function used when displaying one frame according to a first predetermined average gray level value; a dynamic image brightness sub-function, and the first moving image brightness sub-function f1(g) and the second moving image brightness sub-function f2(g) have no intersection point within one of the effective gray level values of the original moving image brightness function, The brightness of the first motion picture luminance sub-function f1(g) is higher than the brightness of the second motion picture brightness sub-function f2(g); f1(g)' and f2(g)' represent according to the first predetermined average The grayscale value decomposes the original motion image luminance function into a third motion image luminance subfunction-fourth motion image luminance subfunction, and the third motion image luminance subfunction f1(g)′ and the fourth dynamic The image brightness sub-function f2(g)' is only in the first predetermined gray in the range of the effective gray level value The value of the intersection point. The display device of claim 6, wherein the ratio generation module is based on one of all pixels of the grayscale value displayed in the frame of the grayscale value less than a critical grayscale value recorded in the grayscale value information. Whether the total number of pixels is less than a critical number of pixels determines the ratio. The display of claim 7, wherein the gray scale value The information system includes a grayscale value statistical curve corresponding to the frame picture, and the grayscale value statistical curve records one grayscale value used for displaying each pixel in the frame picture; wherein the grayscale value statistical curve is Corresponding to the grayscale value of each of the plurality of pixels included in the frame picture; wherein the ratio generation module determines, according to the grayscale value statistical curve, all the pixels whose grayscale value is smaller than the critical grayscale value The total number of pixels. The display of claim 7, wherein the ratio generation module increases the ratio by one unit when the total number of pixels is less than the number of critical pixels. The display of claim 7, wherein the ratio generation module reduces the ratio by one unit when the total number of pixels is greater than the number of critical pixels.