CN110299115B - Overdrive method and time sequence controller - Google Patents
Overdrive method and time sequence controller Download PDFInfo
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- CN110299115B CN110299115B CN201810245071.6A CN201810245071A CN110299115B CN 110299115 B CN110299115 B CN 110299115B CN 201810245071 A CN201810245071 A CN 201810245071A CN 110299115 B CN110299115 B CN 110299115B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3607—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
Abstract
An overdrive method and a time sequence controller are suitable for a liquid crystal display panel. The overdrive method comprises: detecting a frame rate of the liquid crystal display panel, wherein the frame rate corresponds to an overdrive value of the liquid crystal display panel; and correspondingly changing the overdrive value when the frame rate is judged to be changed, and driving the liquid crystal display panel by the changed overdrive value.
Description
Technical Field
The present invention relates to an overdriving method and a timing controller, and more particularly, to an overdriving method and a timing controller for a liquid crystal display panel.
Background
Liquid crystal displays are one of the mainstream products in the display technology industry. For the lcd, if the response speed of the liquid crystal molecules is too slow during the playing of the motion picture, the moving picture will appear motion blur. Accordingly, the lcd can use the overdrive technology to play the motion picture, so as to solve the problem of too slow response speed. However, the overdrive technique may affect the display quality under different conditions, for example, the luminance may change too much when the frame rate changes or when the gray scale value changes, which may cause the user experience to be degraded.
Disclosure of Invention
An aspect of the present invention is to provide an overdrive method and a timing controller for a liquid crystal display panel, which can improve the image display quality of the liquid crystal display panel when the frame rate changes and the image display quality when the gray scale value changes.
According to the above object of the present invention, an overdrive method for a liquid crystal display panel is provided, the overdrive method comprising: detecting a frame rate of the liquid crystal display panel, wherein the frame rate corresponds to an overdrive value of the liquid crystal display panel; and correspondingly changing the overdrive value when the frame rate is judged to be changed, and driving the liquid crystal display panel by the changed overdrive value.
According to one or more embodiments of the present invention, the correspondingly changing the overdrive value comprises: when the frame rate is judged to be increased, the overdrive value is correspondingly increased; and when the frame rate is judged to be reduced, correspondingly reducing the overdrive value.
According to one or more embodiments of the present invention, the overdrive value corresponding to the ith frame after the frame rate change is ODO+[i(ODC-ODO)/N]Wherein i is a positive integer, ODOOverdrive before the frame rate changeValue, ODCThe frame rate is changed to obtain a target overdrive value, N is the number of frames passing through the frame rate when the frame rate is changed to reach the target overdrive value, and i is less than or equal to N.
According to the above object of the present invention, an overdrive method for a liquid crystal display panel is provided, the overdrive method comprising: according to the previous gray scale value and the current gray scale value of the liquid crystal display panel, obtaining an overdrive value corresponding to the previous gray scale value and the current gray scale value from a lookup table; determining a first gain value according to a difference value between a previous gray level value and a current gray level value; determining a second gain value according to the current gray level value; and calculating the overdrive value, the first gain value and the second gain value, then updating the overdrive value according to the calculated result, and driving the liquid crystal display panel according to the updated overdrive value.
According to one or more embodiments of the present invention, the previous gray level value and the current gray level value are greater than or equal to 0 and less than 2NAnd N is 8 or 10.
According to one or more embodiments of the present invention, a difference between the previous gray level value and the current gray level value is less than or equal to 32.
According to one or more embodiments of the present invention, each of the first gain value and the second gain value is greater than 0 and less than or equal to 1.
According to one or more embodiments of the present invention, the second gain value is a concave function, a decreasing function or an increasing function of the current gray level value.
According to the above object of the present invention, a timing controller for a liquid crystal display panel includes a frame rate detecting unit and an overdrive value generating unit. The frame rate detecting unit is used for detecting the frame rate of the liquid crystal display panel, and the frame rate corresponds to the overdrive value of the liquid crystal display panel. The overdrive value generating unit is used for correspondingly changing when the frame rate detecting unit judges that the frame rate changes and outputting the overdrive value so as to drive the liquid crystal display panel.
According to the above object of the present invention, a timing controller for a liquid crystal display panel includes an overdrive value generating unit and an overdrive value adjusting unit. The overdrive value generating unit is used for obtaining overdrive values corresponding to a previous gray-scale value and a current gray-scale value of the liquid crystal display panel from the lookup table, and determining a first gain value according to a difference value of the previous gray-scale value and the current gray-scale value and determining a second gain value according to the current gray-scale value. The overdrive value adjusting unit is used for calculating the overdrive value, the first gain value and the second gain value, then updating the overdrive value according to the calculated result, and driving the liquid crystal display panel according to the updated overdrive value.
Drawings
For a more complete understanding of the embodiments and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a block diagram of overdrive value generation in accordance with some embodiments of the present invention;
FIG. 2 is a diagram illustrating a relationship between frame numbers and overdrive values when frame rates change according to some embodiments of the invention;
FIG. 3 is a block diagram of overdrive value generation in accordance with some embodiments of the present invention;
FIG. 4 is a diagram of a lookup table according to some embodiments of the invention;
FIG. 5 is a table of the relationship between the difference between the previous gray level value and the current gray level value and the first gain value according to some embodiments of the present invention; and
FIG. 6 is a table of second gain values corresponding to previous gray-scale values according to some embodiments of the present invention.
Description of reference numerals:
110 frame rate detection unit
120. 310 overdrive value generation unit
130. 320 lookup table
330 overdrive value adjusting unit
Cur current gray scale value
Pre previous gray scale value
Detailed Description
Embodiments of the invention are discussed in detail below. It should be appreciated, however, that the embodiments provide many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific embodiments discussed are merely illustrative and do not limit the scope of the invention.
Referring to fig. 1, fig. 1 is a block diagram illustrating the generation of an overdrive value according to some embodiments of the invention. The block diagram shown in fig. 1 includes a frame rate detecting unit 110, an overdrive value generating unit 120 and a lookup table 130, which are used for overdrive processing of the lcd panel. In some embodiments, the overdrive processing of the lcd panel is performed in the timing controller, i.e., the frame rate detecting unit 110, the overdrive value generating unit 120 and the memory for storing the lookup table 130 are all located in the timing controller.
The frame rate detecting unit 110 is used for receiving the frame data, detecting the frame rate of the liquid crystal display panel according to the frame data, and sending the frame rate data to the overdrive value generating unit 120 according to the detection result. The overdrive value generation unit 120 determines whether the frame rate of the display device is changed according to the received frame rate data. If the frame rate of the display device is determined to change, the overdrive value generating unit 120 changes the output overdrive value according to the data in the lookup table 130, and drives the liquid crystal display panel with the changed overdrive value.
In detail, if it is determined that the frame rate is increased, the overdrive value generating unit 120 generates a new overdrive value according to the data corresponding to the changed frame rate in the lookup table 130, where the new overdrive value is greater than the overdrive value output before the frame rate is changed. On the contrary, if the frame rate is determined to be decreased, the overdrive value generating unit 120 generates a new overdrive value according to the data corresponding to the changed frame rate in the lookup table 130, where the new overdrive value is smaller than the overdrive value output before the frame rate is not changed.
In some embodiments, the overdrive value used by the overdrive value generation unit 120 for the first frame data after the frame rate change is the data corresponding to the changed frame rate, i.e. the corresponding target overdrive value. However, in the case of an excessively large change in the frame rate, the target overdrive value may be excessively different from the overdrive value before the frame rate change. In this case, if the target overdrive value corresponding to the changed frame rate is directly used to the first frame data after the frame rate is changed, the overdrive value is changed too much in a short time (here, one frame period) to affect the image display quality of the lcd panel.
Therefore, in order to avoid the problem of affecting the image display quality, in other embodiments, the overdrive value generating unit 120 gradually changes the overdrive value to the target overdrive value corresponding to the changed frame rate after the frame rate is changed. In other words, the overdrive value generated by the overdrive value generation unit 120 for the first frame data after the frame rate change is increased or decreased until the target overdrive value is reached.
The overdrive value may be changed linearly after the frame rate is changed until the target overdrive value corresponding to the changed frame rate is reached. In detail, if the overdrive value reaches the target overdrive value in the nth frame after the frame rate change, the overdrive value corresponding to the ith frame after the frame rate change is ODO+[i(ODC-ODO)/N]Wherein i is a positive integer and is less than or equal to N, ODOIs the overdrive value before frame rate change, and ODCIs the target overdrive value corresponding to the changed frame rate.
It should be noted that the above-mentioned N value and ODCThe values may be adjusted according to the characteristics of the lcd panel, such as the resolution, the number of unit pixels, and the alignment type of the lcd panel. In addition, depending on different design and application requirements, in other embodiments, the overdrive value may change non-linearly after the frame rate changes until the target overdrive value corresponding to the changed frame rate is reached.
FIG. 2 shows the relationship between the frame number and the overdrive value when the frame rate changes. In this example, the overdrive value output by the overdrive value generation unit 120 at the 9 th frame after the frame rate change is the target overdrive value, and the target overdrive value corresponding to the frame rate of 120fps is 200. As shown in FIG. 2, the overdrive value is 128 before the frame rate change, i.e., 60fps (60 frames per second); after the frame rate is increased to 120fps, the overdrive value is increased by 8 per frame, i.e., the overdrive value for frame number FN +1 is increased to 136, the overdrive value for frame number FN +2 is increased to 144 …, and so on, until the overdrive value for frame number FN +9 is increased to 200.
Referring to fig. 3, fig. 3 is a block diagram of overdrive value generation according to some embodiments of the invention. The block diagram shown in fig. 3 includes an overdrive value generation unit 310, a lookup table 320, and an overdrive value adjustment unit 330, which are used for the overdrive processing of the liquid crystal display panel. In some embodiments, the overdrive processing of the liquid crystal display panel is performed in the timing controller, that is, the overdrive value generating unit 310, the overdrive value adjusting unit 330 and the memory for storing the lookup table 320 are all located in the timing controller.
The overdrive value generation unit 310 receives the data of two adjacent frames and obtains the overdrive value corresponding to the data of the two adjacent frames according to the data in the lookup table 320. In detail, the data of the two frames are respectively the previous gray level value of the previous frame and the current gray level value of the current frame, and the overdrive value generating unit 310 searches the lookup table 320 for the overdrive value corresponding to the previous gray level value and the current gray level value.
In addition, the overdrive value generation unit 310 also determines a first gain value according to a difference between the previous gray level and the current gray level, and determines a second gain value according to the current gray level. After obtaining the first gain value and the second gain value, the overdrive value adjustment unit 330 further performs an operation on the overdrive value obtained according to the data in the lookup table 320 and the first gain value and the second gain value, for example, multiplies the overdrive value by the first gain value and then multiplies the second gain value, then updates the overdrive value according to the operation result, and performs a driving operation on the liquid crystal display panel according to the updated overdrive value.
In some embodiments, the overdrive value adjustment unit 330 adjusts only the overdrive value having a lower gray-scale value change amount. In other words, the overdrive value adjustment unit 330 only adjusts the overdrive value corresponding to the condition that the difference between the previous gray scale value and the current gray scale value is smaller than a threshold. For example, in a specific embodiment, the driving value generating unit 310 adjusts the corresponding overdrive value when a difference between the previous gray-scale value and the current gray-scale value is less than 32. The first gain value and the second gain value are both greater than 0 and less than or equal to 1, so that the updated driving value is lower than the overdrive value in the lookup table 320. Therefore, under the condition of low gray scale value change degree, the liquid crystal display panel can be driven by using a low overdrive value, the phenomenon that the light-emitting intensity of the liquid crystal display panel is changed too much is avoided, and the image display quality of the liquid crystal display panel is improved.
It should be noted that the threshold, the first gain value and the second gain value may be adjusted according to the characteristics of the liquid crystal display panel, such as the gray-scale bit number, the resolution, the number of unit pixels, the alignment type and the frame rate of the liquid crystal display panel. For example, the above-mentioned adjustment method of the overdrive value can be applied to the lcd panel with the gray-scale bit number of 8 or 10 (i.e. the gray-scale value is 0 to 255 or 0 to 1023) per pixel, and/or the second gain value can be a concave function, a decreasing function or an increasing function of the current gray-scale value, but is not limited thereto.
In addition, in some embodiments, the difference between the previous gray level value and the current gray level value may be interpolated, and the interpolation result corresponds to a specific first gain value and a specific second gain value, which will be illustrated in the following paragraphs.
The block diagram of the overdrive value generation shown in fig. 3 will be described below by taking an example of application to an 8-bit liquid crystal display device. FIG. 4 is a diagram of a lookup table according to some embodiments of the invention. As shown in fig. 4, the previous gray level value and the current gray level value are quantized values, and the overdrive value generation unit 310 adjusts the overdrive value when the difference between the previous gray level value and the current gray level value is not greater than 32, which is illustrated in fig. 5 and 6. In contrast, in the case that the difference between the previous gray scale value and the current gray scale value is greater than 32, the overdrive value generation unit 310 may directly perform the driving operation on the liquid crystal display panel with the corresponding overdrive value stored in the lookup table 320.
FIG. 5 is a table illustrating the relationship between the difference between the previous gray level Pre and the current gray level Cur and the first gain according to some embodiments of the present invention. In the table of FIG. 5, the previous gray level PreThe column of the difference value (i.e., Δ | Pre-Cur |) from the current gray level Cur has 9 preset values, and the preset values all have corresponding first gain values. In addition, fig. 6 is a table of correspondence between the current gray-scale value Cur and the second gain value according to some embodiments of the invention. In the table of fig. 6, the current gray level field has 9 preset values, and the preset values all have corresponding second gain values.
The overdrive value adjustment unit 330 may perform a linear interpolation operation using the corresponding relationship tables of fig. 5 and 6 to obtain a first gain value and a second gain value. For example, if the previous gray level value and the current gray level value are 16 and 32, respectively, the first gain value and the second gain value obtained by the overdrive value adjustment unit 330 are 0.65 and 0.75, respectively, according to the contents shown in fig. 5 and 6; if the previous gray scale value and the current gray scale value are 38 and 48, respectively, the first gain value and the second gain value obtained by the overdrive value adjustment unit 330 are 2 × 0.75/4+2 × 0.7/4-0.725 and 16 × 0.75/32+16 × 0.875/32-0.8125, respectively, according to the contents shown in fig. 5 and 6. In addition, in other embodiments, the overdrive value adjustment unit 330 may perform the nonlinear interpolation operation by using the correspondence table of fig. 5 and 6.
It should be noted that the contents shown in fig. 4 to 6 are only examples, and are not intended to limit the scope of the present invention. For example, the size of the lookup table 320 may be 33 × 33, and the difference field between the previous gray level and the current gray level or the current gray level field may include 17 predetermined values, i.e., the number and/or the interval of the predetermined values may be changed according to the design and application requirements. In addition, the correspondence table shown in fig. 5 and 6 described above may be stored in the memory of the timing controller together with the lookup table 320.
In summary, the overdrive method and the timing driver of the invention can improve the image display quality of the lcd panel when the frame rate changes and when the gray scale value changes.
Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.
Claims (3)
1. An overdrive method for a liquid crystal display panel, the overdrive method comprising:
detecting a frame rate of the liquid crystal display panel, wherein the frame rate corresponds to an overdrive value of the liquid crystal display panel; and
when the frame rate is judged to change, the overdrive value is correspondingly changed, and the liquid crystal display panel is driven by the changed overdrive value, wherein the overdrive value corresponding to the ith frame after the frame rate is changed is ODO+[i(ODC-ODO)/N]Wherein i is a positive integer, ODOFor overdrive value before the frame rate change, ODCThe frame rate is a target overdrive value after the frame rate is changed, N is the number of frames passing through when the frame rate reaches the target overdrive value after the frame rate is changed, and i is less than or equal to N.
2. The overdrive method of claim 1, wherein correspondingly changing the overdrive value comprises:
when the frame rate is judged to be increased, correspondingly increasing the overdrive value; and
when the frame rate is judged to be reduced, the overdrive value is correspondingly reduced.
3. A kind of time schedule controller, suitable for a liquid crystal display panel, this time schedule controller includes:
a frame rate detecting unit for detecting a frame rate of the LCD panel, wherein the frame rate corresponds to an overdrive value of the LCD panel; and
an overdrive value generating unit for changing and outputting the overdrive value when the frame rate detecting unit determines that the frame rate is changed, so as to drive the LCD panel, wherein the overdrive value corresponding to the ith frame after the frame rate is changed is ODO+[i(ODC-ODO)/N]Wherein i is a positive integer, ODOFor overdrive value before the frame rate change, ODCThe frame rate is a target overdrive value after the frame rate is changed, N is the number of frames passing through when the frame rate reaches the target overdrive value after the frame rate is changed, and i is less than or equal to N.
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| CN110299115A (en) | 2019-10-01 |
| CN113178178A (en) | 2021-07-27 |
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