Display device

Abstract

The invention provides a display device which comprises a display panel and a source driver which are electrically connected, and a gamma buffer module in the source driver comprises a plurality of gamma output ends used for outputting a plurality of gamma voltages respectively. A channel buffer module in the source driver is used for generating a plurality of corresponding data voltages according to the plurality of gray-scale values and at least one corresponding gamma voltage; wherein the first switch module is used for controlling the gamma voltage output by the first part gamma output end (at least outputting the maximum and minimum gamma voltages) to act on the channel buffer module to generate a plurality of overdrive voltages corresponding to a plurality of gray-scale values before the channel buffer module generates a plurality of data voltages; the risk that the ideal charging degree cannot be achieved after the pixel electrodes are acted by data signals is reduced, and the uniformity of the brightness of a display picture is improved.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more specifically to a display device. Background Technology

[0002] In a display device, multiple output channels of the source driver transmit data signals to multiple rows of pixels sequentially through multiple data lines, thereby presenting a complete picture.

[0003] However, during the transmission of data signals, the attenuation of the data signals varies when they are transmitted to different rows of pixels due to factors such as the load inside the display panel. Some rows of pixels cannot reach the ideal charging level after being affected by the data signals, resulting in uneven brightness of the displayed image. Summary of the Invention

[0004] The purpose of this invention is to provide a display device that improves the problem of uneven brightness in the display screen caused by some rows of pixels failing to reach the ideal charging level after being acted upon by data signals in existing display devices.

[0005] This invention provides a display device including an electrically connected display panel and a source driver. The display panel includes a common electrode, the voltage of which is a common voltage. The source driver includes:

[0006] A gamma buffer module includes multiple gamma output terminals, each used to output multiple gamma voltages. The multiple gamma output terminals include a first gamma output terminal and a second gamma output terminal, each used to output the maximum and minimum of the multiple gamma voltages. A first portion of the multiple gamma output terminals includes at least the first gamma output terminal and the second gamma output terminal.

[0007] A channel buffer module is used to generate multiple corresponding data voltages based on multiple grayscale values ​​and at least one corresponding gamma voltage, including multiple channel output terminals electrically connected to the display panel, wherein the multiple channel output terminals are respectively used to output the multiple data voltages;

[0008] The first switching module is electrically connected between the gamma output terminal of the first part and the channel buffer module, and is used at least to control whether a current path is formed between each of the gamma output terminals of the first part and the channel buffer module.

[0009] The first switching module is used to control at least one of the first gamma output terminals to form a current path between the channel buffer module and the channel buffer module before the channel buffer module generates the multiple data voltages. The channel buffer module is also used to generate multiple overdrive voltages corresponding to the multiple grayscale values ​​based on at least one gamma voltage output by at least one of the first gamma output terminals.

[0010] Wherein, the overdrive voltage and the corresponding data voltage are both greater than or less than the common voltage, and the absolute value of the difference between the overdrive voltage and the common voltage is greater than the absolute value of the difference between the corresponding data voltage and the common voltage.

[0011] In some embodiments, the channel buffer module further includes multiple channel input terminals, and the source driver further includes a second switching module;

[0012] Among them, the multiple channel input terminals are electrically connected to the first part of the gamma output terminals at least through the second switch module and the first switch module, and the multiple channel input terminals are also electrically connected to the multiple gamma output terminals through the second switch module;

[0013] Among them, the multiple channel input terminals form a current path with each of the first part of the gamma output terminals in a time-division manner, and form a current path with each of the multiple gamma output terminals.

[0014] In some embodiments, the second switch module includes:

[0015] Multiple second switching elements, each of which is electrically connected to a corresponding channel input terminal, are used to control the formation of a current path between the channel input terminal and one or more corresponding gamma output terminals in the first part;

[0016] The first switch module is electrically connected between the first part of the gamma output terminal and the plurality of channel input terminals, and is used at least to control whether a current path is formed between each of the first part of the gamma output terminals and the plurality of channel input terminals.

[0017] In some embodiments, the gamma output terminal of the first part includes a plurality of gamma output terminals, and the first switching module includes:

[0018] Multiple first switching elements are electrically connected to multiple gamma output terminals respectively. Each first switching element is used to control whether a current path is formed between the corresponding gamma output terminal and the corresponding channel input terminal.

[0019] Before the channel buffer module generates multiple data voltages, each of the first switching elements is used to control the formation of a current path between the corresponding channel input terminal and one of the gamma output terminals according to the corresponding grayscale value. The channel buffer module is used to generate the overdrive voltage corresponding to the grayscale value according to the corresponding gamma voltage.

[0020] In some embodiments, before the channel buffer module generates the plurality of data voltages, each of the second switching elements controls the corresponding channel input terminal to form a current path with the plurality of first switching elements, so as to form a current path between the channel input terminal and the plurality of gamma output terminals.

[0021] In some embodiments, before the channel buffer module generates multiple data voltages, each of the first switching elements is used to control the formation of a current path between the corresponding channel input terminal and the target gamma output terminal among the multiple gamma output terminals according to the corresponding grayscale value.

[0022] The plurality of grayscale values ​​include a plurality of binding point grayscale values ​​corresponding to a plurality of gamma voltages. The binding point grayscale value corresponding to the target gamma output terminal is the target binding point grayscale value, and the corresponding gamma voltage is the target gamma voltage. The target binding point grayscale value is the binding point grayscale value that is greater than the grayscale value and has the smallest absolute value of the difference between it and the grayscale value.

[0023] In some embodiments, before the channel buffer module generates multiple data voltages, each of the second switching elements is further configured to control the conduction duration of forming a current path between the corresponding channel input terminal and one of the gamma output terminals according to the corresponding grayscale value, and the channel buffer module is configured to generate the overdrive voltage corresponding to the grayscale value according to the corresponding gamma voltage and the corresponding conduction duration.

[0024] In some embodiments, the gamma output terminal of the first part includes a first gamma output terminal and a second gamma output terminal, and the first switching module includes:

[0025] Two first switching elements are electrically connected to the first gamma output terminal and the second gamma output terminal, respectively, to control whether a current path is formed between the gamma output terminal and the channel input terminal;

[0026] Before the channel buffer module generates multiple data voltages, one of the first switching elements is used to control whether a current path is formed between the corresponding channel input terminal and the first gamma output terminal according to the corresponding grayscale value, and controls the corresponding conduction duration when a current path is formed between the corresponding channel input terminal and the first gamma output terminal. Another first switching element is used to control whether a current path is formed between the corresponding channel input terminal and the second gamma output terminal according to the corresponding grayscale value, and controls the corresponding conduction duration when a current path is formed between the corresponding channel input terminal and the second gamma output terminal. The channel buffer module is used to generate the overdrive voltage corresponding to the grayscale value according to the corresponding gamma voltage and the corresponding conduction duration.

[0027] In some embodiments, before the channel buffer module generates the plurality of data voltages, each of the second switching elements is used to control the channel input terminal to form a current path between the two first switching elements, so that the channel input terminal forms a current path between the two first gamma output terminals.

[0028] In some embodiments, after the channel buffer module generates multiple overdrive voltages, each of the second switching elements is used to control that no current path is formed between the multiple channel input terminals and the first portion of the gamma output terminals, and is used to control that a current path is formed between the multiple channel input terminals and the multiple gamma output terminals. The channel buffer module is used to generate multiple corresponding data voltages based on multiple grayscale values ​​and at least one corresponding gamma voltage.

[0029] This invention provides a display device, wherein the source driver includes: a gamma buffer module, including a plurality of gamma output terminals (including a first gamma output terminal and a second gamma output terminal, respectively, for outputting a plurality of gamma voltages) for outputting a plurality of gamma voltages; and a channel buffer module, for generating a plurality of corresponding data voltages based on a plurality of grayscale values ​​and at least one of the corresponding gamma voltages, including a plurality of channel output terminals electrically connected to the display panel for outputting the plurality of data voltages; wherein, before generating the plurality of data voltages, a first switching module electrically connected between a first portion of the gamma output terminals and the channel buffer module is used to control at least one of the first portion of the gamma output terminals (including at least the first gamma output terminal and the second gamma output terminal) to form a current path with the channel buffer module, and the channel buffer module is further used to generate a plurality of overdrive voltages corresponding to the plurality of grayscale values ​​based on at least one of the gamma voltages output by at least one of the first portion of the gamma output terminals, thereby reducing the risk that the pixel electrode cannot reach the ideal charging level after being acted upon by the data signal and improving the uniformity of the brightness of the displayed image. Attached Figure Description

[0030] The present invention will be further described below with reference to the accompanying drawings. It should be noted that the accompanying drawings described below are merely for illustrating some embodiments of the present invention. Those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0031] Figure 1 This is an architectural diagram of a display device provided in an embodiment of the present invention.

[0032] Figure 2 and Figure 3 This is an internal structure diagram of the source driver provided in an embodiment of the present invention.

[0033] Figure 4 This is a graph showing the change in voltage of a pixel electrode over time after the voltage is applied to the pixel electrode, which is provided as a comparative example of the present invention.

[0034] Figure 5 The graph shows the voltage of the pixel electrode and the voltage of the gate signal changing over time, as provided in an embodiment of the present invention. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0036] In the description of this invention, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include one or more of the stated features. Furthermore, it should be noted that the accompanying drawings only provide structures closely related to the invention, omitting some details less relevant to the invention. The purpose is to simplify the drawings and make the inventive points clear at a glance, not to indicate that the actual device is identical to the accompanying drawings. Figure 1 It is identical, but this is not a limitation of the actual device.

[0037] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase at various points in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0038] The present invention provides a display device, which may include, but is not limited to, the following embodiments and combinations thereof.

[0039] In some embodiments, such as Figure 1As shown, the display device 100 includes a display panel 10 and a source driver 20 electrically connected. The display panel 10 includes a common electrode 101 and a plurality of pixel electrodes 102. The voltage of the common electrode 101 is a common voltage Vcom, and the voltage U of each pixel electrode 102 is a corresponding data voltage Vdata. The common electrode 101 can be arranged across the entire surface to cover the plurality of pixel electrodes 102. Liquid crystal molecules located between each pixel electrode 102 and the common electrode 101 can deflect at a corresponding angle according to the difference between the data voltage Vdata and the common voltage Vcom at their ends. Combined with the light provided by the backlight module of the display device 100, a corresponding brightness is achieved. Further combined with a color filter, a corresponding color is achieved, thereby displaying a color image.

[0040] Among them, such as Figure 2 and Figure 3 As shown, the source driver 20 includes a gamma buffer module 201, which includes a plurality of gamma output terminals 2011, respectively used to output a plurality of gamma voltages (e.g., including 14 gamma voltages Vgam1, Vgam2 to Vgam14). The plurality of gamma output terminals 2011 include a first gamma output terminal and a second gamma output terminal respectively used to output the largest and smallest of the plurality of gamma voltages. The first part of the plurality of gamma output terminals 2011 includes at least the first gamma output terminal and the second gamma output terminal.

[0041] Specifically, for liquid crystal molecules, in order to avoid the deterioration of their properties caused by long-term deflection in the same direction, the same gray level value can have a corresponding positive polarity data voltage Vdata (greater than the common voltage Vcom) and a corresponding negative polarity data voltage Vdata (less than the common voltage Vcom). Furthermore, considering that the ability of liquid crystal molecules to deflect in different directions is different, the absolute values ​​of the difference between the positive polarity data voltage Vdata and the corresponding negative polarity data voltage Vdata and the common voltage Vcom for the same gray level value can be set to be different.

[0042] The multiple gamma voltages can be a set of positive and negative data voltages Vdata corresponding to each of the partial grayscale values ​​(referred to as multiple bound-point grayscale values) in all grayscale values. For example, if there are 7 bound-point grayscale values, then the multiple gamma voltages can include the 14 gamma voltages mentioned above. Here, we take the 14 gamma voltages Vgam1, Vgam2 to Vgam14 as an example where the values ​​increase sequentially.

[0043] Specifically, such as Figure 2 and Figure 3As shown, the gamma buffer module 201 may include a resistor string consisting of multiple resistors connected in series to divide the first input voltage VDDA and the second input voltage AGND input to the two ends of the resistor string to obtain the multiple original gamma voltages. The connection point of two adjacent resistors R can transmit the corresponding divided voltage to the corresponding first digital-to-analog converter DAC1. The first digital-to-analog converter DAC1 can dynamically adjust the voltage value of the corresponding divided voltage to transmit to the corresponding first buffer OP1. The first buffer OP1 is used to amplify the signal output by the first digital-to-analog converter DAC1 to output a larger current to achieve fast charging and discharging. The 14 first buffers OP1 output 14 gamma voltages Vgam1, Vgam2 to Vgam14 respectively.

[0044] Based on the above definition, in this embodiment, the first gamma output terminal can be a gamma output terminal 2011 that outputs the largest of the 14 gamma voltages (Vgam14), and the second gamma output terminal can be a gamma output terminal 2011 that outputs the smallest of the 14 gamma voltages (Vgam1).

[0045] Furthermore, such as Figure 2 and Figure 3 As shown, the source driver 20 further includes a channel buffer module 202, which is used to generate a plurality of corresponding data voltages Vdata based on a plurality of grayscale values ​​(corresponding to a plurality of pixel electrodes 102) and at least one of the corresponding gamma voltages (at least one of 14 gamma voltages Vgam1, Vgam2 to Vgam14), including a plurality of channel output terminals 2021 electrically connected to the display panel 10, which are respectively used to output the plurality of data voltages Vdata.

[0046] When the channel buffer module 202 generates the data voltage Vdata corresponding to each gray level value based on only one gamma voltage, the source driver 20 can store the mapping relationship between the gamma voltage and the gray level value. The channel buffer module 202 can determine the corresponding data voltage Vdata based on the mapping relationship and the current gray level value. At this time, it can be considered that the data voltage Vdata can be used as both the positive and negative data voltage Vdata of the gray level value.

[0047] When the channel buffer module 202 generates the data voltage Vdata corresponding to each grayscale value based on multiple gamma voltages (taking 14 gamma voltages Vgam1, Vgam2 to Vgam14 as an example), such as Figure 2 and Figure 3As shown, the channel buffer module 202 can obtain four gamma voltages corresponding to two bounding point grayscale values ​​from 14 gamma voltages based on which two bounding point grayscale values ​​the current grayscale value is between. (Two of these are the positive and negative gamma voltages corresponding to one bounding point grayscale value, and the other two are the positive and negative gamma voltages corresponding to the other bounding point grayscale value.)

[0048] Specifically, the source driver 20 may also include multiple comparators 2031 corresponding to multiple channel output terminals 2021. The comparators 2031 are used to compare the gray level value corresponding to the channel output terminal 2021 with the multiple gamma voltages mentioned above to determine which two binding point gray level values ​​the gray level value is between, thereby determining the corresponding two binding point gray level values.

[0049] It should be noted that the data signal output by each channel output terminal 2021 may include multiple data voltages Vdata corresponding to multiple pixel electrodes 102 of the corresponding column. This data signal can be transmitted to the corresponding column of pixel electrodes 102 through the corresponding data line in the display panel 10. During the transmission of the data signal, affected by the load in the display panel 10, the data signal attenuates to different rows of pixel electrodes 102 at different degrees. Some rows of pixel electrodes 102 cannot reach the ideal charging level after being acted upon by the data signal, resulting in uneven brightness of the display screen.

[0050] like Figure 4 As shown, in the comparative example provided by the present invention, the internal resistance of the transistor in the channel buffer module 202 is controlled by voltage, which allows the channel buffer module 202 to have different levels of thrust, for example... Figure 4 The four curves HH, HL, LH, and LL correspond to four different levels that increase sequentially. This causes the voltage U of the pixel electrode 102 to increase sequentially with time t after the data voltage Vdata is applied to the pixel electrode 102. In other words, the degree of charging can be increased under the same time duration.

[0051] However, in some locations where the attenuation is particularly severe, due to the size limitation of the transistor, the maximum thrust corresponding to the minimum adjustable internal resistance cannot meet the charging requirements of the pixel electrode 102.

[0052] Based on the problems existing in the comparative example, the source driver 20 is configured as follows in the embodiment provided by the present invention:

[0053] The source driver 20 also includes a first switch module 204, which is electrically connected between the first part of the gamma output terminal 2011 (including at least the first gamma output terminal and the second gamma output terminal) and the channel buffer module 202, and is used at least to control whether a current path is formed between each of the first part of the gamma output terminals 2011 and the channel buffer module 202.

[0054] The first switch module 204 is used to control at least one of the first part of the gamma output terminals 2011 to form a current path between the channel buffer module 202 and the channel buffer module 202 before the channel buffer module 202 generates the multiple data voltages Vdata. The channel buffer module 202 is also used to generate multiple overdrive voltages Vov corresponding to the multiple grayscale values ​​based on at least one gamma voltage (at least one of 14 gamma voltages Vgam1, Vgam2 to Vgam14) output by at least one of the first part of the gamma output terminals 2011.

[0055] For example, when multiple pixel electrodes 102 correspond to the same grayscale values, the first switch module 204 can control only one of the gamma output terminals 2011 in the first part to be electrically connected to the channel buffer module 202, so that the channel buffer module 202 generates the same overdrive voltage Vov corresponding to multiple pixel electrodes 102 based on a gamma voltage (one of 14 gamma voltages Vgam1, Vgam2 to Vgam14) output by a gamma output terminal 2011.

[0056] For example, when multiple pixel electrodes 102 correspond to different grayscale values, the first switch module 204 needs to control multiple gamma output terminals 2011 in the first part to be electrically connected to the channel buffer module 202, so that the channel buffer module 202 generates different overdrive voltages Vov corresponding to pixel electrodes 102 with different grayscale values ​​based on multiple gamma voltages (multiple of 14 gamma voltages Vgam1, Vgam2 to Vgam14) output by a gamma output terminal 2011.

[0057] Wherein, the overdrive voltage Vov and the corresponding data voltage Vdata are both greater than or less than the common voltage Vcom, and the absolute value of the difference between the overdrive voltage Vov and the common voltage Vcom is greater than the absolute value of the difference between the corresponding data voltage Vdata and the common voltage Vcom.

[0058] Figure 5The example shown is that the common voltage Vcom is 0V, and both the overdrive voltage Vov and the corresponding data voltage Vdata are greater than the common voltage Vcom. In this case, the overdrive voltage Vov is greater than the data voltage Vdata, making the difference between the former and the latter greater than that between the latter and the common voltage Vcom.

[0059] Specifically, such as Figure 5 As shown, curves L1 and L2 are the actual and ideal curves of the voltage U of pixel electrode 102 rising with time t after the data voltage Vdata is directly applied to pixel electrode 102. Curve L3 is the actual curve of the voltage U of pixel electrode 102 rising with time t after the overdrive voltage Vov and the data voltage Vdata are applied to pixel electrode 102 successively. Curve L4 is the curve of the voltage of the gate signal applied to pixel electrode 102 changing with time t.

[0060] Understandably, in this embodiment, before the channel buffer module 202 generates multiple data voltages Vdata to act on the multi-column pixel electrodes 102, the first switch module 204 controls at least one of the first gamma output terminals 2011 to form a current path between the channel buffer module 202 and the channel buffer module 202. This allows the channel buffer module 202 to first generate at least one over-driving voltage Vov that differs more significantly from the common voltage Vcom and act on the multi-column pixel electrodes 102. Figure 5 It can be seen that at this time, the voltage U of the pixel electrode 102 can rise rapidly with time t due to the overdrive voltage Vov, and then be stabilized at the corresponding voltage value by the corresponding data voltage Vdata. This improves the charging rate of the voltage U of the pixel electrode 102, reduces the risk that the pixel electrode 102 cannot reach the ideal charging level after being acted upon by the data signal, and improves the uniformity of the brightness of the display screen.

[0061] In some embodiments, such as Figure 2 and Figure 3 As shown, the channel buffer module 202 further includes multiple channel input terminals 2022, and the source driver 20 further includes a second switch module 205; wherein, the multiple channel input terminals 2022 are electrically connected to the first portion of the gamma output terminals 2011 at least through the second switch module 205 and the first switch module 204, and the multiple channel input terminals 2022 are also electrically connected to the multiple gamma output terminals 2011 through the second switch module 205; wherein, the multiple channel input terminals 2022 form a current path with each of the first portion of the gamma output terminals 2011 in a time-division manner, and form a current path with each of the multiple gamma output terminals 2011.

[0062] As can be seen from the above discussion, the second switch module 205 can first control the formation of a current path between the multiple channel input terminals 2022 and the first switch module 204 and the gamma output terminal 2011 in the first part, and then control the formation of a current path between the multiple channel input terminals 2022 and the multiple gamma output terminals 2011.

[0063] Specifically, such as Figure 2 and Figure 3 As shown, the second switch module 205 includes: a plurality of second switch elements 2051, each of which is electrically connected to a corresponding channel input terminal 2022, for controlling the formation of a current path between the channel input terminal 2022 and one or more corresponding gamma output terminals 2011 in the first part; the first switch module 204 is electrically connected between the first part of the gamma output terminals 2011 and the plurality of channel input terminals 2022, for at least controlling whether a current path is formed between each of the first part of the gamma output terminals 2011 and the plurality of channel input terminals 2022.

[0064] That is, whether a current path is formed between each of the first part of the gamma output terminal 2011 and the multiple channel input terminals 2022 is determined by the first switching module 204 and the multiple second switching elements 2051.

[0065] Specifically, such as Figure 2 As shown, the first part of the gamma output terminal 2011 includes a plurality of gamma output terminals 2011. The first switching module 204 includes a plurality of first switching elements 2041, which are electrically connected to the plurality of gamma output terminals 2011 respectively. Each first switching element 2041 is used to control whether a current path is formed between the corresponding gamma output terminal 2011 and the corresponding channel input terminal 2022. Before the channel buffer module 202 generates a plurality of data voltages Vdata, each first switching element 2041 is used to control the formation of a current path between the corresponding channel input terminal 2022 and one of the gamma output terminals 2011 according to the corresponding grayscale value. The channel buffer module 202 is used to generate the overdrive voltage Vov corresponding to the grayscale value according to the corresponding gamma voltage (one of 14 gamma voltages Vgam1, Vgam2 to Vgam14).

[0066] That is, Figure 2 The first part of the gamma output terminal 2011 includes all gamma output terminals 2011, and the first switch module 204 also includes a plurality of corresponding first switch elements 2041.

[0067] Specifically, before the channel buffer module 202 generates multiple data voltages Vdata, each first switching element 2041 can be closed or opened according to the corresponding grayscale value to control whether the corresponding gamma output terminal 2011 forms a current path with the channel buffer module 202, so that each channel input terminal 2022 obtains the gamma voltage corresponding to one of the several closed first switching elements 2041 and generates the overdrive voltage Vov of the grayscale value according to the gamma voltage.

[0068] Furthermore, such as Figure 2 As shown, before the channel buffer module 202 generates multiple data voltages Vdata, each of the second switching elements 2051 controls the corresponding channel input terminal 2022 to form a current path with multiple first switching elements 2041, so that a current path is formed between the channel input terminal 2022 and multiple gamma output terminals 2011.

[0069] Understandably, before the channel buffer module 202 generates multiple data voltages Vdata, since the channel buffer module 202 needs to acquire gamma voltage to generate overdrive voltage Vov, each second switching element 2051 needs to control the formation of a current path between the corresponding channel input terminal 2022 and one of the closed first switching elements 2041, and to form a current path between the channel input terminal 2022 and one of the gamma output terminals 2011.

[0070] In some embodiments, such as Figure 2 As shown, before the channel buffer module 202 generates multiple data voltages Vdata, each of the first switching elements 2041 is used to control the formation of a current path between the corresponding channel input terminal 2022 and the target gamma output terminal among the multiple gamma output terminals 2011 according to the corresponding grayscale value; wherein, the multiple grayscale values ​​include multiple binding point grayscale values ​​corresponding to the multiple gamma voltages, the binding point grayscale value corresponding to the target gamma output terminal is the target binding point grayscale value, the corresponding gamma voltage is the target gamma voltage, and the target binding point grayscale value is the binding point grayscale value that is greater than the grayscale value and has the smallest absolute value of the difference with the grayscale value.

[0071] As discussed above, multiple gamma voltages can be the set of positive and negative data voltages Vdata corresponding to each of the multiple bound-point grayscale values. That is, each bound-point grayscale value corresponds to two gamma voltages (the difference between the two can be considered to be small).

[0072] Specifically, in this embodiment, for each grayscale value, there is a corresponding target binding point grayscale value. The target binding point grayscale value is the smallest among multiple binding point grayscale values ​​that are greater than the grayscale value. The target binding point grayscale value also has a corresponding positive polarity data voltage Vdata and a corresponding negative polarity data voltage Vdata.

[0073] Considering the above discussion about the positive polarity data voltage Vdata and the corresponding negative polarity data voltage Vdata, regardless of whether it is positive or negative polarity, since the gray level value of the target binding point corresponding to the gray level value is greater than the gray level value, the corresponding positive polarity data voltage Vdata will be greater than the corresponding positive polarity data voltage Vdata of the gray level value, and the corresponding positive polarity data voltage Vdata will be less than the corresponding positive polarity data voltage Vdata of the gray level value.

[0074] Specifically, in this embodiment, a comparator 2031 corresponding to each channel input terminal 2022 compares its corresponding grayscale value with multiple binding point grayscale values ​​to determine its corresponding target binding point grayscale value. Furthermore, based on the polarity of the grayscale value, the first switching element 2041 corresponding to the target gamma output terminal of the target binding point grayscale value is controlled to close. Further, after determining all the first switching elements 2041 that need to be closed for the multiple grayscale values ​​corresponding to the multiple channel input terminals 2022, each comparator 2031 can obtain the target gamma voltage required for the corresponding channel input terminal 2022. Further still, multiple second switching elements 2051 control the formation of a current path between the multiple channel input terminals 2022 and all the closed first switching elements 2041. Further still, each second buffer OP2 can generate a corresponding overdrive voltage Vov based on the voltage received by the corresponding channel input terminal 2022.

[0075] Furthermore, such as Figure 2 As shown, before the channel buffer module 202 generates multiple data voltages Vdata, each of the second switching elements 2051 is further configured to control the conduction duration of the current path formed between the corresponding channel input terminal 2022 and one of the gamma output terminals 2011 according to the corresponding grayscale value. The channel buffer module 202 is configured to generate the overdrive voltage Vov corresponding to the grayscale value according to the corresponding gamma voltage and the corresponding conduction duration.

[0076] It should be noted that since the number of grayscale values ​​of the binding points is limited, for two grayscale values ​​with different values, the corresponding two target binding point grayscale values ​​may be the same. When the polarity of the two values ​​is the same, the target gamma voltages corresponding to the two values ​​may also be the same. However, since the actual values ​​of the two values ​​are different, this embodiment further realizes the differential setting of the two driving voltages Vov by setting the duration of the corresponding channel input terminal 2022 being applied by the same target gamma voltage, thereby improving the accuracy of the overdrive voltage Vov.

[0077] Specifically, since the target gamma voltage corresponding to the first switching element 2041 may correspond to multiple channel input terminals 2022, it is possible that, under the premise that a current path is formed between each channel input terminal 2022 and the same target gamma output terminal, each second switching element 2051 controls the conduction time of the current path between the corresponding channel input terminal 2022 and the target gamma output terminal according to the corresponding grayscale value (the difference between the grayscale value and the target binding point grayscale value), thereby realizing the duration for which the corresponding channel input terminal 2022 is acted upon by the corresponding same target gamma voltage.

[0078] In some embodiments, such as Figure 3 As shown, the first part of the gamma output terminal 2011 includes a first gamma output terminal and a second gamma output terminal. The first switching module 204 includes two first switching elements 2041, which are electrically connected to the first gamma output terminal and the second gamma output terminal, respectively. Before the channel buffer module 202 generates multiple data voltages Vdata, one of the first switching elements 2041 is used to control whether a current path is formed between the corresponding channel input terminal 2022 and the first gamma output terminal according to the corresponding grayscale value, and to ensure that a current path is formed between the corresponding channel input terminal 2022 and the first gamma output terminal. When a current path is formed between the first gamma output terminals, the corresponding conduction duration is controlled. Another first switching element 2041 is used to control whether a current path is formed between the corresponding channel input terminal 2022 and the second gamma output terminal according to the corresponding grayscale value, and to control the corresponding conduction duration when a current path is formed between the corresponding channel input terminal 2022 and the second gamma output terminal. The channel buffer module 202 is used to generate the overdrive voltage Vov corresponding to the grayscale value according to the corresponding gamma voltage (the largest or smallest of the plurality of gamma voltages) and the corresponding conduction duration.

[0079] Figure 3 The illustrated embodiments and Figure 2The difference in the illustrated embodiment is that the first part of the gamma output terminal 2011 only includes a first gamma output terminal and a second gamma output terminal (used to output the largest and smallest of the multiple gamma voltages, respectively), and correspondingly, the first switch module 204 also only includes two first switch elements 2041.

[0080] As discussed above, for a positive grayscale value, the first switching element 2041 connected to the first gamma output terminal can be closed, and the duration of the first switching element 2041 being closed is determined according to the difference between the grayscale value and the maximum of the gamma voltages output from the first gamma output terminal, thereby controlling the duration for which the corresponding channel input terminal 2022 is acted upon by the maximum of the gamma voltages.

[0081] Similarly, for a negative grayscale value, the first switching element 2041 connected to the second gamma output terminal can be closed, and the duration of the first switching element 2041 being closed is determined according to the difference between the grayscale value and the minimum gamma voltage output by the second gamma output terminal, thereby controlling the duration for which the corresponding channel input terminal 2022 is acted upon by the minimum gamma voltage.

[0082] Understandably, in this embodiment, for grayscale values ​​of different polarities, the largest or smallest value of the gamma voltage with the greatest difference from the common voltage corresponding to that polarity is used to act on the channel input terminal 2022, thereby maximizing the charging rate of the pixel electrode 102, and further generating overdrive voltages Vov of different magnitudes by differentiating the above-mentioned conduction duration.

[0083] Similarly, such as Figure 3 As shown, before the channel buffer module 202 generates multiple data voltages Vdata, each of the second switching elements 2051 is used to control the channel input terminal 2022 to form a current path between the two first switching elements 2041, so that the channel input terminal 2022 forms a current path between the two first gamma output terminals.

[0084] For details, please refer to [link / reference]. Figure 2 The relevant descriptions in [the document / article]. Similarly, Figure 3 Each comparator 2031 in the system can also compare the polarity of its corresponding grayscale value with the polarities of the first gamma output and the second gamma output to determine its corresponding target binding point grayscale value.

[0085] In some embodiments, such as Figure 2 and Figure 3As shown, after the channel buffer module 202 generates multiple overdrive voltages Vov, each of the second switching elements 2051 is used to control that no current path is formed between the multiple channel input terminals 2022 and the first part of the gamma output terminals 2011, and is also used to control that a current path is formed between the multiple channel input terminals 2022 and the multiple gamma output terminals 2011. The channel buffer module 202 is used to generate multiple corresponding data voltages Vdata based on multiple grayscale values ​​and at least one corresponding gamma voltage.

[0086] Understandable, considering the above text about Figure 5 As can be seen from the discussion, when multiple grayscale values ​​corresponding to the same row of pixel electrodes 102 are transmitted to multiple comparators 2031, each comparator 2031 determines which first switching elements 2041 need to be turned on according to the polarity and value of the grayscale value. After multiple second switching elements 2051 control multiple channel input terminals 2022 to form a current path between the first switching module 204, each second buffer OP2 can generate a corresponding overdrive voltage Vov according to the voltage received by the corresponding channel input terminal 2022 (and the conduction duration of the corresponding second switching element 2051).

[0087] After the channel buffer module 202 generates multiple overdrive voltages Vov, each comparator 2031 determines at least one (e.g., two bound grayscale values) from multiple bound grayscale values ​​based on the polarity and value of the grayscale value. Furthermore, each second digital-to-analog converter DAC2 can dynamically adjust the voltage received by the corresponding comparator 2031. After multiple second switching elements 2051 control the formation of a current path between multiple channel input terminals 2022 and multiple second digital-to-analog converters DAC2, each second buffer OP2 can generate the corresponding data voltage Vdata based on the voltage received by the corresponding channel input terminal 2022.

[0088] The display device provided in the embodiments of the present invention has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of the present invention. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A display device, characterized in that, The device includes an electrically connected display panel and a source driver. The display panel includes a common electrode, the voltage of which is a common voltage. The source driver includes: A gamma buffer module includes multiple gamma output terminals, each used to output multiple gamma voltages. The multiple gamma output terminals include a first gamma output terminal and a second gamma output terminal, each used to output the maximum and minimum of the multiple gamma voltages. A first portion of the multiple gamma output terminals includes at least the first gamma output terminal and the second gamma output terminal. A channel buffer module is used to generate multiple corresponding data voltages based on multiple grayscale values ​​and at least one corresponding gamma voltage, including multiple channel output terminals electrically connected to the display panel, wherein the multiple channel output terminals are respectively used to output the multiple data voltages; The first switching module is electrically connected between the gamma output terminal of the first part and the channel buffer module, and is used at least to control whether a current path is formed between each of the gamma output terminals of the first part and the channel buffer module. The first switching module is used to control at least one of the first gamma output terminals to form a current path between the channel buffer module and the channel buffer module before the channel buffer module generates the multiple data voltages. The channel buffer module is also used to generate multiple overdrive voltages corresponding to the multiple grayscale values ​​based on at least one gamma voltage output by at least one of the first gamma output terminals. Wherein, the overdrive voltage and the corresponding data voltage are both greater than or less than the common voltage, and the absolute value of the difference between the overdrive voltage and the common voltage is greater than the absolute value of the difference between the corresponding data voltage and the common voltage.

2. The display device as claimed in claim 1, characterized in that, The channel buffer module also includes multiple channel input terminals, and the source driver also includes a second switch module; Among them, the multiple channel input terminals are electrically connected to the first part of the gamma output terminals at least through the second switch module and the first switch module, and the multiple channel input terminals are also electrically connected to the multiple gamma output terminals through the second switch module; Among them, the multiple channel input terminals form a current path with each of the first part of the gamma output terminals in a time-division manner, and form a current path with each of the multiple gamma output terminals.

3. The display device as claimed in claim 2, characterized in that, The second switch module includes: Multiple second switching elements, each of which is electrically connected to a corresponding channel input terminal, are used to control the formation of a current path between the channel input terminal and one or more corresponding gamma output terminals in the first part; The first switch module is electrically connected between the first part of the gamma output terminal and the plurality of channel input terminals, and is used at least to control whether a current path is formed between each of the first part of the gamma output terminals and the plurality of channel input terminals.

4. The display device as claimed in claim 3, characterized in that, The first part includes multiple gamma output terminals, and the first switching module includes: Multiple first switching elements are electrically connected to multiple gamma output terminals respectively. Each first switching element is used to control whether a current path is formed between the corresponding gamma output terminal and the corresponding channel input terminal. Before the channel buffer module generates multiple data voltages, each of the first switching elements is used to control the formation of a current path between the corresponding channel input terminal and one of the gamma output terminals according to the corresponding grayscale value. The channel buffer module is used to generate the overdrive voltage corresponding to the grayscale value according to the corresponding gamma voltage.

5. The display device as claimed in claim 4, characterized in that, Before the channel buffer module generates multiple data voltages, each of the second switching elements controls the corresponding channel input terminal to form a current path with multiple first switching elements, so as to form a current path between the channel input terminal and multiple gamma output terminals.

6. The display device as claimed in claim 4, characterized in that, Before the channel buffer module generates multiple data voltages, each of the first switching elements is used to control the formation of a current path between the corresponding channel input terminal and the target gamma output terminal among the multiple gamma output terminals according to the corresponding grayscale value. The plurality of grayscale values ​​include a plurality of binding point grayscale values ​​corresponding to a plurality of gamma voltages. The binding point grayscale value corresponding to the target gamma output terminal is the target binding point grayscale value, and the corresponding gamma voltage is the target gamma voltage. The target binding point grayscale value is the binding point grayscale value that is greater than the grayscale value and has the smallest absolute value of the difference between it and the grayscale value.

7. The display device as claimed in claim 4, characterized in that, Before the channel buffer module generates multiple data voltages, each of the second switching elements is further configured to control the conduction duration of forming a current path between the corresponding channel input terminal and one of the gamma output terminals according to the corresponding grayscale value. The channel buffer module is configured to generate the overdrive voltage corresponding to the grayscale value according to the corresponding gamma voltage and the corresponding conduction duration.

8. The display device as claimed in claim 3, characterized in that, The first part includes a first gamma output terminal and a second gamma output terminal, and the first switching module includes: Two first switching elements are electrically connected to the first gamma output terminal and the second gamma output terminal, respectively, to control whether a current path is formed between the gamma output terminal and the channel input terminal; Before the channel buffer module generates multiple data voltages, one of the first switching elements is used to control whether a current path is formed between the corresponding channel input terminal and the first gamma output terminal according to the corresponding grayscale value, and controls the corresponding conduction duration when a current path is formed between the corresponding channel input terminal and the first gamma output terminal. Another first switching element is used to control whether a current path is formed between the corresponding channel input terminal and the second gamma output terminal according to the corresponding grayscale value, and controls the corresponding conduction duration when a current path is formed between the corresponding channel input terminal and the second gamma output terminal. The channel buffer module is used to generate the overdrive voltage corresponding to the grayscale value according to the corresponding gamma voltage and the corresponding conduction duration.

9. The display device as claimed in claim 8, characterized in that, Before the channel buffer module generates multiple data voltages, each of the second switching elements is used to control the channel input terminal to form a current path between the two first switching elements, so that the channel input terminal forms a current path between the two first gamma output terminals.

10. The display device according to any one of claims 4 to 9, characterized in that, After the channel buffer module generates multiple overdrive voltages, each of the second switching elements is used to control that no current path is formed between the multiple channel input terminals and the first part of the gamma output terminals, and to control that a current path is formed between the multiple channel input terminals and the multiple gamma output terminals. The channel buffer module is used to generate multiple corresponding data voltages based on multiple grayscale values ​​and at least one corresponding gamma voltage.

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