Display panel and pixel driving method thereof

Abstract

A display panel and a method for driving pixels thereof. The display panel includes a pixel array, a gate driver, and a light emitting driver. The pixel array has a plurality of columns of light emitting diode pixels. The gate driver is coupled to the pixel array to sequentially provide a plurality of gate signals to the plurality of columns of light emitting diode pixels. The light emitting driver is coupled to the pixel array to sequentially provide a plurality of light emitting signals to the plurality of columns of light emitting diode pixels, wherein the light emitting signals are not sequentially enabled relative to the positions of the plurality of columns of light emitting diode pixels and the enabling periods of the light emitting signals are dispersed in a single light emitting period.

Description

Technical Field

[0001] The present invention relates to a display module, and in particular to a display panel and a method for driving pixels thereof. Background Art

[0002] At present, the light-emitting diode display module technology has obvious advantages. In other words, compared with other types of display modules, the light-emitting diode display module has better performance in energy saving, service life and safety of use, so the light-emitting diode display module has been widely used.

[0003] Moreover, with the advancement of display technology, the frame refresh rate of display devices is getting higher and higher to provide a better viewing experience in specific fields (such as e-sports and movies). However, a higher frame refresh rate means higher power consumption, and in some viewing scenarios (such as clerical work and viewing pictures), a very high frame refresh rate is not required. Therefore, in order to reflect the scenario in which the display device is used, the frame refresh rate of the display device may change to reflect the scenario. However, changes in the frame refresh rate will affect the length of time during the picture, which may cause the picture to flicker, so it is necessary to adjust the display mode of the display device according to the changes in the frame refresh rate. Summary of the invention

[0004] The invention provides a display panel and a pixel driving method thereof, which can reduce the picture flicker of the light emitting diode display panel caused by the change of picture update rate.

[0005] The display panel of the present invention comprises a pixel array, a gate driver, and a light emitting driver. The pixel array has a plurality of rows of light emitting diode pixels. The gate driver is coupled to the pixel array to sequentially provide a plurality of gate signals to the plurality of rows of light emitting diode pixels. The light emitting driver is coupled to the pixel array to sequentially provide a plurality of light emitting signals to the plurality of rows of light emitting diode pixels, wherein the light emitting signals are not sequentially enabled relative to the positions of the plurality of rows of light emitting diode pixels and the enabling periods of the light emitting signals are dispersed in a single light emitting period.

[0006] The pixel driving method of the display panel of the present invention comprises the following steps: providing a plurality of gate signals to a plurality of rows of light-emitting diode pixels in a pixel array in sequence via a gate driver; providing a plurality of light-emitting signals to a plurality of rows of light-emitting diode pixels via a light-emitting driver, wherein the light-emitting signals are enabled in sequence not relative to the positions of the plurality of rows of light-emitting diode pixels and the enabling periods of the light-emitting signals are dispersed in a single light-emitting period.

[0007] Based on the above, in the display panel and pixel driving method of the embodiment of the present invention, the light emitting signal is not enabled sequentially relative to the positions of multiple columns of LED pixels and the enabling period of the light emitting signal is spread over a single light emitting period. In other words, the enabling period of the light emitting signal can be distributed in a manner similar to a random number. Therefore, during the frame period shortened due to the change in the frame refresh rate, the columns of LED pixels that are lit in the display panel will tend to be evenly distributed, thereby having an inhibitory effect on the frame flicker caused by the shortened frame period.

[0008] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below with reference to the accompanying drawings for detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 FIG. 4 is a schematic diagram of a system including a light emitting diode display panel according to an embodiment of the present invention.

[0010] Figure 2 FIG. 4 is a system diagram of a gate driver according to an embodiment of the present invention.

[0011] Figure 3 FIG. 4 is a system diagram of a light emitting driver according to an embodiment of the present invention.

[0012] Figure 4 FIG. 4 is a timing diagram of a display panel operating in a first scenario according to an embodiment of the present invention.

[0013] Figure 5 FIG. 4 is a timing diagram of a display panel operating in a second scenario according to an embodiment of the present invention.

[0014] Figure 6 FIG. 4 is a timing diagram of a display panel during a single frame according to an embodiment of the present invention.

[0015] Figure 7 FIG. 4 is a timing diagram of a display panel during a single frame period according to another embodiment of the present invention.

[0016] Figure 8 The figure is a flow chart of a method for driving pixels of a light emitting diode display panel according to an embodiment of the present invention.

[0017]

Explanation of symbols

[0018] 100: Display panel

[0019] 110: Gate Driver

[0020] 120: Light emitting driver

[0021] 130: Pixel Array

[0022] EM[1]-EM[n], EM[k]-EM[2k]: luminous signal

[0023] EP1-EPk: Luminous start signal

[0024] ESR1-ESR2k: Emitting Shift Registers

[0025] F11, F12, F21, F22, F23: Screen duration

[0026] GPstart: Scan start signal

[0027] GSR1-GSR8 Gate Shift Registers:

[0028] PX: Light Emitting Diode Pixel

[0029] SG[1]-SG[n]: gate signal

[0030] tg, tem, tem1-tem4: enabling period

[0031] tpp: light period

[0032] S110, S120: Steps DETAILED DESCRIPTION

[0033] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and the present invention, and will not be interpreted as an idealized or overly formal meaning unless explicitly defined as such herein.

[0034] It should be understood that although the terms "first", "second", "third", etc. can be used to describe various elements, components, regions, layers and / or parts in this article, these elements, components, regions, and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, the "first element", "component", "region", "layer" or "part" discussed below can be referred to as a second element, component, region, layer or part without departing from the teachings of this article.

[0035] The terms used herein are only for the purpose of describing specific embodiments and are not restrictive. As used herein, unless the content clearly indicates, the singular forms "a", "an" and "the" are intended to include plural forms, including "at least one". "Or" means "and / or". As used herein, the term "and / or" includes any and all combinations of one or more related listed items. It should also be understood that when used in this specification, the terms "include" and / or "include" specify the presence and / or parts of the features, regions, entireties, steps, operations, elements, but do not exclude the presence or addition of one or more other features, regions, entireties, steps, operations, elements, parts and / or their combinations.

[0036] Figure 1 FIG. 1 is a schematic diagram of a system including a light emitting diode display panel according to an embodiment of the present invention. Figure 1 In the present embodiment, the display panel 100 at least includes a gate driver 110, a light emitting driver 120 and a pixel array 130. The pixel PX array 130 has a plurality of rows of light emitting diode pixels PX. The gate driver 110 is coupled to the pixel array 130 to sequentially provide a plurality of gate signals SG[1]-SG[n] to the plurality of rows of light emitting diode pixels PX, wherein n is a finger number, and the gate signals SG[1]-SG[n] are sequentially enabled relative to the positions of the plurality of rows of light emitting diode pixels PX. The light emitting driver 120 is coupled to the pixel PX array 130 to provide a plurality of light emitting signals EM[1]-EM[n] to the plurality of rows of light emitting diode pixels PX, wherein the light emitting signals EM[1]-EM[n] are not sequentially enabled relative to the positions of the plurality of rows of light emitting diode pixels PX and the enabling periods of the light emitting signals EM[1]-EM[n] (such as Figure 4 tem) is distributed in a single light-emitting period (such as Figure 5 tpp) as shown.

[0037] According to the above, the enabling periods of the light emitting signals EM[1]-EM[n] are basically distributed in a manner similar to random numbers. Therefore, during the frame period shortened due to the change in the frame refresh rate, the rows of the light-emitting diode pixels PX that are lit in the display panel 100 will tend to be evenly distributed, thereby having an effect of suppressing the frame flicker caused by the shortened frame period.

[0038] Figure 2 This is a system diagram of a gate driver according to an embodiment of the present invention. Figure 1 and 2In the present embodiment, the gate driver 110 includes a plurality of gate shift registers (eight gate shift registers GSR1-GSR8 are taken as an example here), and the gate shift registers GSR1-GSR8 are enabled sequentially according to the scan start signal GPstart to provide sequentially enabled gate signals SG[1]-SG[8].

[0039] Figure 3 This is a system diagram of a light emitting driver according to an embodiment of the present invention. Figure 1 and 3 In the present embodiment, the light emitting driver 120 includes a plurality of light emitting shift registers (herein, 2k light emitting shift registers ESR1-ESR2k are taken as an example, where k may be a positive integer and may be greater than or equal to 4). The light emitting shift registers ESR1-ESR2k may be divided into a plurality of light emitting shift register groups. For example, the first light emitting shift register group may include light emitting shift registers ESR1, ESRk+1, ESR2k+1, etc., the second light emitting shift register group may include light emitting shift registers ESR2, ESRk+2, ESR2k+2, etc., and the kth light emitting shift register group may include light emitting shift registers ESRk, ESR2k, ESR3k, etc. Further, the light emitting signals EM[1]-EM[2k] output by the light emitting shift registers (such as ESR1-ESR2k) of each light emitting shift register group are provided to a plurality of non-adjacent columns of light emitting diode pixels PX in a plurality of columns.

[0040] Relatively speaking, the light emitting signals EM[1]-EM[2k] may be divided into a plurality of light emitting groups. For example, the first light emitting group may include light emitting signals EM[1], EM[k+1], EM[2k+1], etc., the second light emitting group may include light emitting signals EM[2], EM[k+2], EM[2k+2], etc., the kth light emitting group may include light emitting signals EM[k], EM[2k], EM[3k], etc. Specifically, the light emitting signals EM[1]-EM[2k] of each light emitting group are provided to a plurality of non-adjacent columns of light emitting diode pixels PX in a plurality of columns of light emitting diode pixels PX, and the number of intervals between the plurality of non-adjacent columns of light emitting diode pixels PX in each light emitting group is the number k of light emitting shift register groups.

[0041] The light emitting shift register groups receive light emitting start signals (such as EP1-EPk) respectively and are enabled in sequence. For example, the first light emitting shift register group (i.e., light emitting shift registers ESR1, ESRk+1, ESR2k+1, etc.) is controlled by the light emitting start signal EP1 and is enabled in sequence, the second light emitting shift register group (i.e., light emitting shift registers ESR2, ESRk+2, ESR2k+2, etc.) is controlled by the light emitting start signal EP2 and is enabled in sequence, and the kth light emitting shift register group (i.e., light emitting shift registers ESRk, ESR2k, ESR3k, etc.) is controlled by the light emitting start signal EPk and is enabled in sequence. Furthermore, in order to enable the light emitting signals EM[1]-EM[2k] output by the light emitting shift registers ESR1-ESR2k to be enabled in a manner similar to random numbers, each of the light emitting start signals EP1-EPk is not completely overlapped or completely non-overlapped with another of the light emitting start signals EP1-EPk.

[0042] Relatively speaking, the light-emitting groups are respectively triggered by a corresponding one of the light-emitting start signals (such as EP1-EPk) to enable the light-emitting signals therein (such as EM[1]-EM[2k]) in sequence. For example, the first light-emitting group (i.e., the light-emitting signals EM[1], EM[k+1], EM[2k+1], etc.) are triggered by the light-emitting start signal EP1 and enabled in sequence, the second light-emitting group (i.e., the light-emitting signals EM[2], EM[k+2], EM[2k+2], etc.) are triggered by the light-emitting start signal EP2 and enabled in sequence, and the kth light-emitting group (i.e., the light-emitting signals EM[k], EM[2k], EM[3k], etc.) are triggered by the light-emitting start signal EPk and enabled in sequence.

[0043] Figure 4 FIG. 1 is a timing diagram of a display panel operating in a first scenario according to an embodiment of the present invention. Figure 1 and Figure 4 In this embodiment, it is assumed that the frame periods F11 and F12 correspond to different frame refresh rates, and 12 rows of LED pixels PX are used as an example for explanation. In the frame periods F11 and F12, along the positions (i.e., the number of rows) of the LED pixels PX, the enabling periods tg of the gate signals (e.g., SG[1]-SG[n]) are enabled sequentially, while the enabling periods tem of the luminous signals (e.g., EM[1]-EM[n]) are not enabled sequentially.

[0044] Furthermore, the enable period tem of the light-emitting signals (such as EM[1]-EM[n]) is divided into 4 groups. The first group is the enable period tem of the light-emitting signals (such as EM[1]-EM[n]) corresponding to the 1st, 5th and 9th columns. The second group is the enable period tem of the light-emitting signals (such as EM[1]-EM[n]) corresponding to the 2nd, 6th and 10th columns. The third group is the enable period tem of the light-emitting signals (such as EM[1]-EM[n]) corresponding to the 3rd, 7th and 11th columns. The fourth group is the enable period tem of the light-emitting signals (such as EM[1]-EM[n]) corresponding to the 4th, 8th and 12th columns. The enabling period tem of the first group of light signals (e.g., EM[1]-EM[n]) (i.e., corresponding to the 1st, 5th, and 9th columns) is provided in sequence (i.e., enabled in sequence), but has nothing to do with the light signals of other groups (e.g., EM[1]-EM[n]); the enabling period tem of the second group of light signals (e.g., EM[1]-EM[n]) (i.e., corresponding to the 2nd, 6th, and 10th columns) is provided in sequence (i.e., enabled in sequence), but has nothing to do with the light signals of other groups (e.g., EM[1]-EM[n]). The other groups can refer to Figure 4 As shown, no further details will be given here.

[0045] Figure 5 FIG. 1 is a timing diagram of a display panel operating in a second scenario according to an embodiment of the present invention. Figure 1 , Figure 4 and Figure 5 In this embodiment, it is assumed that the frame refresh rate of the frame periods F21 and F22 is different from the frame refresh rate of the frame period F23, and 12 rows of LED pixels PX are used as an example for explanation. Figure 4 The display panel 100 is driven by the driving method shown in FIG. 1 . Although the frame period F22 is cut off due to the change of the frame refresh rate, the frame refresh rate is changed. Figure 4 and Figure 5 As shown, the distribution of the enabling period tem of the luminous signal (such as EM[1]-EM[n]) is similar, that is, in the shortened frame period F22, the brightness of the display panel 100 is not particularly high on any side (such as the top or the bottom), so the frame flicker caused by the change of the frame refresh rate can be suppressed.

[0046] Figure 6 FIG. 1 is a timing diagram of a display panel in a single frame period according to an embodiment of the present invention. Figure 1 , Figure 4 and Figure 6In this embodiment, 12 rows of LED pixels PX are used as an example, wherein the same or similar elements are numbered the same or similarly. The total overlapping time length of the enabling periods (e.g., tem1-tem4) of the luminous signals (e.g., EM[1]-EM[n]) in a single frame period may be greater than or equal to 80% of the time length of a single luminous period tpp.

[0047] Figure 7 FIG. 1 is a timing diagram of a display panel in a single frame period according to another embodiment of the present invention. Figure 1 , Figure 4 and Figure 7 In this embodiment, 12 rows of LED pixels PX are used as an example, wherein the same or similar components are numbered the same or similarly. In some embodiments, the enabling period tem of the light emitting signal (such as EM[1]-EM[n]) may be relatively short. In this case, the light emitting shift register (such as Figure 3 As shown, the light-emitting shift registers ESR1-ESR2k are divided into more groups, which is equivalent to dividing the light-emitting signals (such as EM[1]-EM[n]) into more groups, so that the enabling period tem of the light-emitting signals (such as EM[1]-EM[n]) is distributed more evenly. In other words, the number of light-emitting shift registers ESR1-ESR2k groups can be inversely proportional to the time length of the enabling period tem of the light-emitting signals (such as EM[1]-EM[n]), but the embodiment of the present invention is not limited thereto.

[0048] Figure 8 FIG. 1 is a flowchart of a method for driving pixels of a light emitting diode display panel according to an embodiment of the present invention. Figure 8 In the present embodiment, the method for driving pixels of the display panel includes the following steps. In step S110, a plurality of gate signals are sequentially provided to a plurality of columns of light-emitting diode pixels in a pixel array via a gate driver. In step S120, a plurality of light-emitting signals are provided to a plurality of columns of light-emitting diode pixels via a light-emitting driver, wherein these light-emitting signals are enabled sequentially not relative to the positions of the plurality of columns of light-emitting diode pixels and the enabling periods of these light-emitting signals are spread over a single light-emitting period. The order of steps S110 and S120 is for illustration only, and the embodiments of the present invention are not limited thereto. Furthermore, the details of steps S110 and S120 may be referred to. Figures 1 to 7 The embodiments are described in detail and will not be repeated here.

[0049] In summary, in the display panel and pixel driving method of the embodiment of the present invention, the light emitting signal is not enabled sequentially relative to the positions of multiple columns of LED pixels and the enabling period of the light emitting signal is spread over a single light emitting period. In other words, the enabling period of the light emitting signal can be distributed in a manner similar to a random number. Therefore, during the frame period shortened due to the change in the frame refresh rate, the columns of the LED pixels that are lit in the display panel will tend to be evenly distributed, thereby having the effect of suppressing the frame flicker caused by the shortened frame period.

[0050] Although the present invention has been disclosed as above by way of embodiments, it is not intended to limit the present invention. Those skilled in the art may make slight changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the scope defined in the attached claims.

Claims

1. A display panel, comprising: a pixel array having a plurality of columns of light emitting diode pixels; A gate driver coupled to the pixel array to sequentially provide a plurality of gate signals to the plurality of rows of light emitting diode pixels; as well as A light emitting driver coupled to the pixel array to provide a plurality of light emitting signals to the plurality of rows of light emitting diode pixels, wherein the light emitting signals are not enabled sequentially relative to the positions of the plurality of rows of light emitting diode pixels and the enabling periods of the light emitting signals are dispersed in a single light emitting period, The light-emitting driver includes a plurality of light-emitting shift registers, which are divided into a plurality of light-emitting shift register groups. The light-emitting signals output by the light-emitting shift registers in each light-emitting shift register group are provided to a plurality of non-adjacent columns of light-emitting diode pixels in the plurality of columns of light-emitting diode pixels, wherein the number of the light-emitting shift register groups is inversely proportional to the time length of the enabling period of the light-emitting signals. 2 . The display panel as claimed in claim 1 , wherein the number of intervals between the plurality of non-adjacent rows of light emitting diode pixels is the number of the light emitting shift register groups. 3 . The display panel as claimed in claim 1 , wherein the light emitting shift register groups receive light emitting start signals respectively, and each of the light emitting start signals of the light emitting shift register groups partially overlaps or does not overlap with another of the light emitting start signals. 4 . The display panel as claimed in claim 1 , wherein the number of the light emitting shift register groups is greater than or equal to 4. 5 . The display panel as claimed in claim 1 , wherein a total overlapping time length of the enabling periods of the light emitting signals in a single frame period is greater than or equal to 80% of a time length of a single light emitting period. 6 . The display panel as claimed in claim 1 , wherein the gate driver comprises a plurality of gate shift registers, and the gate shift registers are enabled sequentially to provide the gate signals.

7. A method for driving a pixel of a display panel, comprising: sequentially providing a plurality of gate signals to a plurality of columns of light emitting diode pixels in a pixel array via a gate driver; as well as A plurality of light emitting signals are provided to the plurality of rows of light emitting diode pixels via a light emitting driver, wherein the light emitting signals are not enabled sequentially relative to the positions of the plurality of rows of light emitting diode pixels and the enabling periods of the light emitting signals are dispersed in a single light emitting period, Wherein, the driving method further includes: The light emitting signals are divided into a plurality of light emitting groups. The light emitting signals of each light emitting group are provided to a plurality of non-adjacent rows of light emitting diode pixels in the plurality of rows of light emitting diode pixels. The number of the light emitting groups is inversely proportional to the duration of the enabling period of the light emitting signals. 8 . The driving method as claimed in claim 7 , wherein the number of intervals between the plurality of non-adjacent rows of LED pixels is the number of the light-emitting groups. 9 . The driving method as claimed in claim 7 , wherein the light-emitting groups are respectively triggered by light-emitting start signals, and each of the light-emitting start signals of the light-emitting groups partially overlaps or does not overlap with another of the light-emitting start signals. 10 . The driving method as claimed in claim 7 , wherein the number of the light emitting groups is greater than or equal to 4. 11 . The driving method as claimed in claim 7 , wherein a total overlapping time length of the enabling periods of the light emitting signals in a single frame period is greater than or equal to 80% of a time length of a single light emitting period.

Images