TWI643172B - Driving method of display panel - Google Patents

Abstract

A display panel driving method includes a plurality of first signal lines, a plurality of second signal lines, a plurality of pixel structures, a plurality of first signal line driving circuits, and a plurality of second signal line driving circuits. The first signal line is divided into a plurality of first signal line groups by a plurality of first signal line driving circuits, and the first signal lines of the first signal line group are sequentially enabled. When the first signal line of the first signal line group adjacent to the other first signal line group is enabled, the second signal line driving circuit provides the first data signal to each of the second signal lines, and the same When the other first signal lines of the signal line group are enabled, the second signal line driving circuit provides the second data signal to each of the second signal lines. And when the plurality of pixel structures display the same gray level, the first data signal and the second data signal have different waveforms.

Description

Display panel driving method

The present invention relates to a driving method, and in particular to a driving method of a display panel.

With the popularity of electronic devices, various display technologies are constantly being upgraded to meet the needs of a wider variety of applications. In the case of electronic paper display panels, the display effect is close to the physical paper and its power saving features, so that more and more products are introduced into the electronic paper display panel. In order to reduce the frame area to increase the effective display area, the circuit design and driving method of the electronic paper display panel are continuously improved. However, no matter what improvement method is adopted, the electronic paper display panel needs to have a uniform display effect.

The invention provides a driving method of a display panel, which can make the display panel have a uniform display effect.

In the driving method of the display panel of the embodiment of the invention, the display panel includes a plurality of first signal lines, a plurality of second signal lines, a plurality of pixel structures, a plurality of first signal line driving circuits, and a plurality of second signal lines. Drive circuit. Each pixel structure is driven by one of the first signal lines and one of the second signal lines to display gray scales. The driving method of the embodiment of the present invention includes dividing, by the first signal line driving circuit, the first signal line into a plurality of first signal line groups, and sequentially enabling the first signal line of the first signal line group; and one of the first When the first signal line adjacent to the other first signal line group is enabled in the signal line group, the second signal line driving circuit provides the first data signal to each of the second signal lines, and the same first signal line group When the other first signal lines are enabled, the second signal line driving circuit provides the second data signal to each of the second signal lines. The first data signal has a first waveform to display a predetermined gray scale, and the second data signal has a second waveform to display the predetermined gray scale, and the first waveform is different from the second waveform.

In an embodiment of the invention, the first waveform is the same as the period of the second waveform.

In an embodiment of the invention, the first waveform and the second waveform have different pulse widths.

In an embodiment of the invention, the first waveform and the second waveform have the same pulse height.

In an embodiment of the present invention, when the first signal line adjacent to the previous first signal line group is enabled in the first signal line group, the first data signal provided by the second signal line driving circuit has the first Adjusting the waveform; when the first signal line adjacent to the next first signal line group in the same first signal line group is enabled, the first data signal provided by the second signal line driving circuit has a second adjustment waveform; The first adjustment waveform displaying the predetermined gray scale is different from the second adjustment waveform for displaying the predetermined gray scale.

In an embodiment of the invention, the first adjustment waveform is the same as the period of the second adjustment waveform.

In an embodiment of the invention, the first adjustment waveform and the second adjustment waveform have different pulse widths.

In an embodiment of the invention, the first adjustment waveform and the second adjustment waveform have the same pulse height.

In an embodiment of the invention, the first signal line driving circuit sets the ith first signal line of each first signal line group and the ith first signal line of the other first signal group at different timings. Connected to the first signal source through the same transmission line to enable the first signal line, i is a positive integer.

In an embodiment of the invention, the number of the transmission lines is M, i is not greater than M, and M is a positive integer.

In an embodiment of the invention, the number of the first signal lines is N, the number of transmission lines is M, M is less than N, and both M and N are positive integers.

Based on the above, the driving method of the display panel according to the embodiment of the present invention improves the display unevenness in the display panel by using the adjustment of the data signal.

The above described features and advantages of the invention will be apparent from the following description.

FIG. 1 is a partial schematic view of a display panel according to an embodiment of the invention. As shown in FIG. 1 , the display panel 100 includes a plurality of first signal lines 110 , a plurality of second signal lines 120 , a plurality of pixel structures 130 , a first signal line driving circuit 140 , and a second signal line driving circuit 150 . The first signal line 110 and the second signal line 120 have different extending directions and are mutually staggered with each other. An array of pixel structures 130 is disposed between the interleaved first signal lines 110 and the second signal lines 120, and each of the pixel structures 130 is driven by one of the first signal lines 110 and one of the second signal lines 120. display. The first signal line driving circuit 140 and the second signal line driving circuit 150 are configured to input corresponding signals to the first signal line 110 and the second signal line 120.

In the present embodiment, the pixel structure 130 may include an active element 132 and a display unit 134 connected to the active element 132. The display unit 134 may include a display medium (not shown) and other components (eg, pixel electrodes, counter electrodes, storage capacitors, etc.) for controlling the state of the display medium. In this embodiment, the display medium may be an electrophoretic display medium, an electrowetting display medium, or the like, which may alternatively be a substance having a bistable characteristic to control light. The active component 132 can be connected to one of the first signal lines 110 and one of the second signal lines 120. The signal transmitted on the first signal line 110 is used to control the opening and closing of the active component 132. When the signal transmitted on the first signal line 110 turns on the active component 132, it can be considered that the first signal line 110 is enabled. When the active component 132 is turned on, the signal on the second signal line 120 can be input to the display unit 134 by the activated active component 132. At this time, the display unit 134 can present a predetermined gray scale according to the received signal to implement the function of the screen display. Therefore, in this embodiment, the first signal line 110 is used as the scan line and the second signal line 120 is used as the data line. However, the present invention is not limited thereto.

The first signal line driving circuit 140 is configured to control the input of the signal of the first signal line 110. For example, the plurality of first signal line driving circuits 140 may divide the first signal line 110 into a plurality of first signal line groups G110. The display panel 100 can also include a plurality of transmission lines 160 and a first signal source 170. The plurality of transmission lines 160 are connected between the first signal line driving circuit 140 and the first signal source 170. The first signal source 170 is configured to provide a signal to be input to the first signal line 110, and the signal from the first signal source 170 is input to the corresponding signal by the transmission of the transmission line 160 and the operation of the first signal line driving circuit 140. The first signal line 110.

In this embodiment, the number of the first signal lines 110 is N, the number of the transmission lines 160 is M, N, M are both positive integers and N is greater than M. In Fig. 1, M is used as an example for illustration, but in other embodiments, M may be other positive integers. As can be seen from FIG. 1, the first signal line driving circuit 140 can divide the M first signal lines 110 into a first signal line group G110. The first signal line 110 of the same first signal line group G110 can be respectively connected to the transmission line 160, and specifically, the ith first signal line 110 of the same first signal line group G110 can be correspondingly connected to the first i transmission lines 160, where i is a positive integer and not greater than M. For example, the first first signal line 110a is connected to the first transmission line 160a, the second first signal line 110b is correspondingly connected to the second transmission line 160b, and the third first signal line 110c is connected to the corresponding The third transmission line 160c, the fourth first signal line 110d is correspondingly connected to the fourth transmission line 160d, and the fifth first signal line 110e is correspondingly connected to the fifth transmission line 160e.

In this embodiment, the first signal line driving circuit 140 can control whether each of the first signal line groups G110 and the transmission line 160 are electrically connected. For example, the first signal line driving circuit 140 can perform a selection operation to electrically connect one of the first signal line groups G110 to the transmission line 160, and the other first signal line groups G110 are not electrically connected to the transmission line 160. At the same time, the first signal source 170 can sequentially provide signals to the first transmission line 160a to the fifth transmission line 160e. Therefore, in the first signal line group G110 electrically connected to the transmission line 160, the first first signal line 110a to the fifth first signal line 110e can sequentially receive the signal provided by the first signal source 170. The order is enabled.

2 is a schematic diagram of signals of a first driving circuit and a transmission line according to an embodiment of the invention. Referring to FIG. 1 and FIG. 2 simultaneously, the signal SG110a and the signal SG110b are signals for selecting the first signal line group G110a or the first signal line group G110b, respectively. The signal S160a is the signal that the first signal source 170 provides to the transmission line 160a, the signal S160b is the signal that the first signal source 170 provides to the transmission line 160b, and the signal S160c is the signal that the first signal source 170 provides to the transmission line 160c, and the signal S160d is the first signal. The signal source 170 provides a signal to the transmission line 160d, and the signal S160e provides a signal for the first signal source 170 to the transmission line 160e.

The first signal line driver circuit 140 selectively connects the first signal line group G110a to the transmission line 160 according to the signal SG110a. At this time, the first signal line 110a of the first signal line group G110a can receive the signal transmitted by the transmission line 160a, and the first signal line 110b of the first signal line group G110a can receive the signal transmitted by the transmission line 160b, and the first signal line group G110a The first signal line 110c can receive the signal transmitted by the transmission line 160c. The first signal line 110d of the first signal line group G110a can receive the signal transmitted by the transmission line 160d, and the first signal line 110e of the first signal line group G110a can receive the transmission line 160e. The signal passed. At the same time, the first signal line group G110b is not electrically connected to the transmission line 160, and the first signal line 110a~110e in the first signal line group G110b does not receive the signal.

Next, the first signal line driving circuit 140 selects to connect the first signal line group G110b to the transmission line 160 according to the signal SG110b. At this time, the first signal lines 110a-110e in the first signal line group G110b can sequentially receive the signals transmitted by the transmission lines 160a-160e. At the same time, the first signal line group G110a is not electrically connected to the transmission line 160, and the first signal line 110a~110e in the first signal line group G110a does not receive the signal. In this manner, the display panel 100 of the present embodiment can realize the signal transmission of the first signal line 110 in a layout manner in which the number of transmission lines 160 is less than the number of the first signal lines 110. Due to the reduced number of transmission lines 160, the display panel 110 can have a narrower bezel width to achieve the need for a large display area.

In order to realize the display of the screen, the second signal line driving circuit 150 supplies the data signal to the second signal line 120, so that the corresponding pixel structure 130 is input with the corresponding data signal to display the corresponding gray level. In general, the data signal provided by the second signal line driver circuit 150 can determine the gray level to be displayed by the pixel structure 130. However, when all the pixel structures 130 of the display panel 100 are written with the same data signal, in some cases, the pixel structure 130 near the boundary of the different first signal line group G110 may be found to be different from other regions. Order. Such inconsistency results in a dominant display defect, and the display quality of the display panel 100 is poor. This situation is more apparent when the display panel 100 is intended to have all of the pixel structures 130 exhibit the same gray level. For example, when the display panel 100 displays a white screen or a black screen over the entire surface, periodic gray lines may appear in the screen. Therefore, the driving method of the display panel 100 of the present embodiment can improve the above problem by using different waveform data signals for the same predetermined gray scale to the pixel regions 130 of different regions.

FIG. 3 is a schematic diagram of different data signals for displaying the same predetermined gray level in the driving method of the display panel according to an embodiment of the invention. Referring to FIG. 1 and FIG. 3 simultaneously, in the embodiment, the first signal line driving circuit 140 can be driven by the signal of FIG. 2, so that the first signal line 110 of the first signal line group G110 is sequentially enabled. When the first signal line 110 (for example, 110a or 110e) of the first signal line group G110 adjacent to the other first signal line group G110 is enabled, the second signal line driving circuit 150 provides the first data signal S120a. When the second signal line 120 is enabled, and the other first signal lines 110 (eg, 110b-110d) of the same first signal line group G110 are enabled, the second signal line driver circuit 150 provides the second data signal S120b. Each of the second signal lines 120 is provided. As can be seen from FIG. 3, the first data signal S120a for displaying the predetermined gray level and the second data signal S120b for displaying the same predetermined gray level respectively have the first waveform WFa and the second waveform WFb, and the first waveform WFa and the second waveform The waveform WFb is different.

In this embodiment, the first data signal S120a having the first waveform WFa is input to the second signal line 120 in a time zone in which the signal of the transmission line 160a or 160e is at the high level. The second data signal S120b having the second waveform WFb is input to the second signal line 120 in a time zone in which the signals of the transmission lines 160b to 160d are at a high level. Therefore, the pixel structure 130 connected to the first signal lines 110a and 110e can receive the first data signal S120a, and the pixel structure 130 connected to the first signal lines 110b to 110d can receive the second data signal S120b.

As can be seen from FIG. 3, the first waveform WFa has a first period Ta, the second waveform WFb has a second period Tb, and the first period Ta is the same as the second period Tb. Therefore, although the first data signal S120a and the second data signal S120b have different waveforms, the driving method of the embodiment can be performed at a fixed picture update rate. In addition, the pulse width WPa of the first waveform WFa is different from the pulse width WPb of the second waveform WFb, wherein the pulse width WPa of the first waveform WFa is smaller than the pulse width WPb of the second waveform WFb in the figure, but is not limited thereto. . Since the first data signal S120a and the second data signal S120b are used to display the same predetermined gray scale, the pulse height WHa of the first waveform WFa and the pulse height WHb of the second waveform WFb of the present embodiment may be identical to each other. Thus, although the first waveform WFa and the second waveform WFb are different, after being input to the corresponding pixel structure 130, the same gray scale can be presented. The display panel 100 can utilize such a driving method to achieve desired display uniformity.

In addition, in some embodiments, the pixel structure 130 on the first signal line 110a and the pixel structure 130 on the first signal line 110e may also use different waveform data signals to display the same predetermined gray level. For example, FIG. 4 is a schematic diagram showing signals input to the second signal line to display a predetermined gray level when the first signal lines 110a and 110e are enabled. Referring to FIG. 4, when the first signal line 110a is enabled, the signal input to the second signal line 120 to display the predetermined gray level may be one of the first data signals S120a1 and S120a2, and the first signal line 110e is enabled. The signal input to the second signal line 120 to display the predetermined gray level may be the other of the first data signals S120a1 and S120a2. The first data signal S120a1 has a first adjustment waveform WWA1 and the first data signal S120a2 has a second adjustment waveform WWA2. Here, the first adjustment waveform WFa1 and the second adjustment waveform WFa2 are different from the second waveform WFb in FIG. In addition, the first adjustment waveform WWA1 and the second adjustment waveform WWA2 are both used to make the corresponding pixel structure 130 display the same gray level, but different from each other. For example, the pulse width WPa1 in the first adjustment waveform WFa1 is different from the pulse width WPa2 in the second adjustment waveform WFa2. However, the period Ta1 of the first adjustment waveform WFa1 is the same as the period Ta2 of the second adjustment waveform WFa2, and the pulse height WHa1 of the first adjustment waveform WFa1 is the same as the pulse height WHa2 of the second adjustment waveform WFa2. Although FIG. 4 illustrates that the pulse width WPa1 is smaller than the pulse width WPa2, in other embodiments, the widths of the two may be adjusted according to different needs.

In the above embodiments, the difference in the different waveforms may be adjusted in accordance with the results of the inspection test of the display panel 100. For example, when a completed display panel 100 displays a full-face white screen, a gray line defect is displayed in the white screen, and the waveform of the data signal of the pixel structure located near the boundary of the different first signal line groups can be adjusted. Make the grayscale it appears towards a white trend. When a completed display panel 100 displays a black screen on the whole surface, a gray line defect is displayed in the black screen, and the waveform of the data signal of the pixel structure located near the boundary of the different first signal line groups can be adjusted to be rendered. The grayscale is more black. Such signal adjustment can be repeated until the display uniformity of the display panel 100 meets the requirements. The driving method of the display panel 100 is to drive the respective pixel structures 130 in accordance with the signals adjusted in the above manner. In the manufacturing process, such adjusted signals can be directly applied to the batch-completed display panel 100, and the above-described inspection test is not required for each display panel.

In summary, the display panel of the embodiment of the present invention converts a signal input to a part of the pixel structure to display a predetermined gray scale to adjust the waveform of the signal of the same gray scale from the other pixel structure. Thereby, although the display panel uses the group selection driving method to enable the first signal line, the pixel structure near the boundary of different groups can exhibit the same gray level as other areas to achieve a uniform display effect.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

100‧‧‧ display panel

110, 110a~110e‧‧‧first signal line

120‧‧‧second signal line

130‧‧‧ pixel structure

132‧‧‧Active components

134‧‧‧Display unit

140‧‧‧First signal line driver circuit

150‧‧‧Second signal line driver circuit

160, 160a~160e‧‧‧ transmission line

170‧‧‧first signal source

G110, G110a, G110b‧‧‧ first signal line group

S120a, S120a1, S120a2‧‧‧ first data signal

S120b‧‧‧Second information signal

S160a~S160e, SG110a, SG110b‧‧‧ signals

Ta‧‧ first cycle

Ta1, Ta2‧‧ cycle

Tb‧‧‧ second cycle

WFa‧‧‧first waveform

WFa1‧‧‧First adjustment waveform

WFa2‧‧‧ second adjustment waveform

WFb‧‧‧second waveform

WHa, WHa1, WHa2, WHb‧‧‧ pulse height

WPa, WPa1, WPa2, WPb‧‧‧ pulse width

FIG. 1 is a partial schematic view of a display panel according to an embodiment of the invention. 2 is a schematic diagram of signals of a first driving circuit and a transmission line according to an embodiment of the invention. FIG. 3 is a schematic diagram of different data signals for displaying the same predetermined gray level in the driving method of the display panel according to an embodiment of the invention. FIG. 4 is a schematic diagram showing signals input to the second signal line to display a predetermined gray scale when the first signal lines 110a and 110e are enabled.

Claims (10)

A display panel driving method includes a plurality of first signal lines, a plurality of second signal lines, a plurality of pixel structures, a plurality of first signal line driving circuits, and a plurality of second signal line driving circuits, each of which The pixel structure is driven by one of the first signal lines and one of the second signal lines to display gray scales. The driving method includes: dividing the first signal lines by the first signal line driving circuits a first signal line group, and sequentially enabling the first signal lines of the first signal line groups; and a first signal line of the first signal line group adjacent to the other of the first signal line groups is When the second signal line driving circuit supplies a first data signal to each of the second signal lines, and when one of the other first signal lines of the first signal line group is enabled, the first The second signal line driving circuit provides a second data signal to each of the second signal lines, wherein the first data signal has a first waveform for displaying a predetermined gray level, and the second data signal has a predetermined gray color to be displayed. Second of the order Shape, different from the first waveform and the second waveform. The driving method of the display panel according to claim 1, wherein the first waveform has the same period as the second waveform. The driving method of the display panel according to the first aspect of the invention, wherein the first waveform and the second waveform have different pulse widths. The driving method of the display panel according to claim 1, wherein the first waveform and the second waveform have the same pulse height. The driving method of the display panel of claim 1, wherein: the first signal line of the first signal line group adjacent to the previous first signal line group is enabled, and the second signal is The first data signal provided by the line driving circuit has a first adjustment waveform. When the first signal line of the first signal line group adjacent to the next first signal line group is enabled, the second signal line is enabled. The first data signal provided by the driving circuit has a second adjustment waveform; and the first adjustment waveform for displaying the predetermined gray level is different from the second adjustment waveform for displaying the predetermined gray level. The driving method of the display panel according to claim 5, wherein the first adjustment waveform has the same period as the second adjustment waveform. The driving method of the display panel according to claim 5, wherein the first adjustment waveform and the second adjustment waveform have different pulse widths. The driving method of the display panel according to claim 5, wherein the first adjustment waveform and the second adjustment waveform have the same pulse height. The driving method of the display panel according to the first aspect of the invention, wherein the first signal line driving circuit compares the ith first signal line of each of the first signal line groups with the ith line of the other first signal group The first signal line is connected to the first signal source through the same transmission line at different timings to enable the first signal lines, and i is a positive integer. The driving method of the display panel according to claim 9, wherein the number of the transmission lines is M, the number of the first signal lines is N, and i is not greater than M, M is less than N, and both M and N are A positive integer.