TWI706398B - Display panel and driving method thereof - Google Patents

Abstract

A display panel including a driving substrate and a plurality of display portions. The driving substrate includes a plurality of first and second driving elements. Each of the second driving element includes a current detection circuit. Each of the display portions has a plurality of sub-display portions. Each of the sub-display portions has a plurality of display units. Each of the display unit has a plurality of light emitting elements. The sub-display portions include a first and a second sub-display portions. The current detection circuit determines that whether the second sub-display portion has a dead pixel or not according to passing a current value of each of the corresponding light-emitting element of the each of the display unit of the second sub-display portion. If yes, the first driving element drives the first sub-display portion to display an image. If not, the second driving element drives the second sub-display portion to display the image. Furthermore, a driving method of the display panel is also provided.

Description

Display panel and driving method thereof

The present invention relates to a display panel, and in particular to a light emitting diode display (LED display).

With the advancement of technology, different types of display panels have been developed. For example, the types of display panels include liquid crystal display (LCD) and organic light emitting diode display (OLED). display) or a light-emitting diode display panel.

Among the above-mentioned types of display panels, since the organic light-emitting diode display panel and the light-emitting diode display panel are self-luminous technologies, the use of light guide devices is omitted, which facilitates the trend toward thinner display panels. Moreover, compared to organic light-emitting diode display panels, light-emitting diode display panels use inorganic materials, which have better reliability and longer service life, and are regarded as the mainstream of display technology.

However, in the process of manufacturing light-emitting diode display panels, due to process yield factors, some display pixels may not be able to emit light or the light-emitting performance is not as expected, and dead pixels will be formed, which affects the display panel’s performance. Display quality.

The present invention provides a display panel with good display quality.

The present invention provides a driving method of a display panel, which can make the display panel have good display quality.

In an embodiment of the present invention, a display panel is provided. The display panel has multiple display areas. The display panel includes a driving substrate and a plurality of display parts. The driving substrate has a first surface and a second surface opposite to each other. The driving substrate includes a plurality of first driving elements and a plurality of second driving elements. Each second driving element includes a current detection circuit. These first driving elements are arranged on the first surface. These second driving elements are arranged on the second surface. These display parts are arranged on the first surface. Each display part includes a plurality of sub-display parts. Each sub-display part includes a plurality of display units. Each display unit includes a plurality of light-emitting elements. These sub-display parts further include a first sub-display part and a second sub-display part. In each display area, a first driving element, a second driving element, and a display part are provided, and the corresponding first driving element is electrically connected to the first sub-display part, and the corresponding second driving element is electrically connected Connect to the second sub-display part. The current detection circuit determines whether the second sub-display part has dead pixels according to the magnitude of the current passing through each light-emitting element corresponding to each display unit in the second sub-display part. If so, the second driving element stops driving the second sub-display part and sends an on signal to notify the first driving element, so that the first driving element drives the first sub-display part to display an image frame. If not, the second driving element drives the second sub-display part to display the image frame.

An embodiment of the present invention provides a method for driving a display panel, which includes: dividing a plurality of sub-display portions in each display area of a display panel into a first sub-display portion and a second sub-display portion, so that the first sub-display portion The one sub-display part and the second sub-display part have different electrical connections. It is detected whether the second sub-display part in each display area of the display panel has dead pixels. If yes, the second sub-display part is closed, and the first sub-display part is driven to display the image frame. If not, the second sub-display part is driven to display the image frame.

Based on the above, in the display panel of the embodiment of the present invention, it detects whether the second sub-display part as the main display part in each display area has dead pixels by means of self-detection. If the second sub-display part has dead pixels, the second driving element stops displaying the second sub-display part, and switches its display function to the first driving element so that the first driving element displays the first sub-display part. Therefore, the display panel of the embodiment of the present invention can ensure that there is a sub-display part in each display area to display the image frame, and reduce the probability that the display area cannot be displayed. Therefore, the display panel of the embodiment of the present invention has good display quality. For similar reasons, the driving method of the display panel of the embodiment of the present invention can provide good display quality of the display panel.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail in conjunction with the accompanying drawings.

100: display panel

110: Drive substrate

112: The first drive element

114: second drive element

116: first circuit layer

118: second circuit layer

A-A’, B-B’: Section

AD: arrangement direction

BS: back side

DP: display part

DS: Display side

DR: display area

DU: display unit

DU1: The first display unit

DU2: second display unit

DU3: The third display unit

DU4: Fourth display unit

E: Light-emitting element

BE: blue light emitting element

GE: Green light emitting element

RE: Red light emitting element

H: Conductive through hole

ID: Current detection element

S1: First surface

S2: second surface

SDP: sub display part

SDP1: The first sub display part

SDP2: The second sub display part

S100, S200: steps

FIG. 1 is a schematic top view of a display panel according to an embodiment of the invention.

FIG. 2 is a schematic top view of a display area of the display panel of FIG. 1.

Fig. 3 is a schematic cross-sectional view of the section A-A' of Fig. 2.

4 and 5 are schematic diagrams of the operations of the first and second sub-display parts of the display area in FIG. 2 respectively.

Fig. 6 is a schematic cross-sectional view of the section B-B' of Fig. 1.

FIG. 7 is a schematic flowchart of a driving method of a display panel according to an embodiment of the present invention.

FIG. 1 is a schematic top view of a display panel according to an embodiment of the invention. FIG. 2 is a schematic top view of a display area of the display panel of FIG. 1. Fig. 3 is a schematic cross-sectional view of the section A-A' of Fig. 2. 4 and 5 are schematic diagrams of the operations of the first and second sub-display parts of the display area in FIG. 2 respectively. Fig. 6 is a schematic cross-sectional view of the section B-B' of Fig. 1.

Please refer to FIGS. 1 to 3 first. In macro terms, in this embodiment, the display panel 100 is, for example, a light emitting diode display panel. The display panel 100 has a display side DS and a back side BS opposite to each other. The display panel 100 has a plurality of display areas DR arranged in an array for a user on the display side DS to watch the image frame.

In this embodiment, the display panel 100 includes a driving substrate 110 and a plurality of display parts DP. In the following paragraphs, each component and the configuration relationship between each component will be described in detail.

2 and 3, the driving substrate 110 is composed of multiple semiconductor layers The formed semiconductor substrate is, for example, a thin film transistor substrate (TFT substrate), which is provided with a plurality of thin film transistors (not shown). The driving substrate 110 is used to drive the display parts DP to display image frames.

As shown in FIG. 3, the driving substrate 110 has a first surface S1 and a second surface S2 opposite to each other. The first surface S1 is, for example, the upper surface of the driving substrate 110, and the second surface S2 is, for example, the lower surface of the driving substrate 110, but it is not limited thereto. The first surface S1 faces the backside BS. The second surface S2 faces the display side DS.

As shown in FIGS. 2 and 3, the driving substrate 110 includes a plurality of first driving elements 112, a plurality of second driving elements 114, a plurality of first circuit layers 116 (shown in the thick black dotted line in FIG. 2), and a plurality of The second circuit layer 118 (shown in the thick black solid line in FIG. 2) and a plurality of conductive through holes H. The first and second driving elements 112 and 114 can drive at least a part of SDP1 and SDP2 of the display portion DP according to the image data to display image frames. The first and second circuit layers 116 and 118 and the conductive through holes H are used to transmit electrical signals. These conductive through holes H penetrate the driving substrate 110 to communicate with the first and second surfaces S1 and S2. In addition, each second driving element 114 further includes a current detection element ID for detecting the magnitude of the current. The current detection element ID is, for example, an ammeter, but not limited to this.

The display parts DP are, for example, clusters of a plurality of display units DU, arranged on the second surface S2 in an array, and are respectively arranged in the display areas DR (as shown in FIG. 1). Each display part DP includes a plurality of sub display parts SDP, and is, for example, a first sub display part SDP1 and a second sub display part SDP2. The display units DU included in the first sub-display part SDP1 are called first and third display units DU1 and DU3. The display unit DU included in the second sub-display part SP2 is called It is the second and fourth display units DU2 and DU4. In this embodiment, the second display unit DU2 is located between the first and third display units DU1 and DU3, and the third display unit DU3 is located between the second and fourth display units DU2 and DU4. The first and second driving elements 112 and 114 are located between the second and third display units DU2 and DU3. In other embodiments, there may be more than two sub-display parts, and the present invention is not limited by the number of sub-display parts. As shown in FIG. 2, each sub-display part SPD includes a plurality of display units DU. Each display unit DU includes a plurality of light emitting elements E, and the light emitting colors of the light emitting elements E are different from each other. For example, each display unit DU includes red, green, and blue light emitting elements RE, GE, and BE. The light-emitting element E can be a sub-millimeter light-emitting diode (Mini LED) or a micro-light-emitting diode (Micro LED). The size of the sub-millimeter light-emitting diode is, for example, within the range of 100 microns to 200 microns, and The size of the miniature light-emitting diode is, for example, a micron-level size, and its size is, for example, within a range of less than 100 microns and greater than 0 microns, and the present invention is not limited thereto. The above-mentioned size of the light-emitting diode is defined as the length of the diagonal line of the top view of the light-emitting diode, for example, and the present invention is not limited to this.

The arrangement of components in the display area DR will be explained in detail in the following paragraphs.

2 and 3, in each display area DR, a display portion DP, a first driving element 112, a second driving element 114, a first circuit layer 116, a second circuit layer 118 and A part of the plurality of conductive through holes H (two as an example, but not limited to this). A first driving element 112 and a first circuit The layer 116 is disposed on the first surface S1, and the first driving element 112 is electrically connected to the first circuit layer 116. A second driving element 114 and a second circuit layer 118 are disposed on the second surface S2, and the second driving element 114 and the second circuit layer 118 are electrically connected. The current detecting element ID can be electrically connected to the first driving element 112 via the second circuit layer 118, the conductive through hole H, and the first circuit layer 116.

In each display area DR, the first driving element 112 is electrically connected to the first and third display units DU1 and DU3 of the first sub-display part SP1 through the first circuit layer 116 and the conductive through holes H. The second driving element 114 is electrically connected to the second and fourth display units DU2 and DU4 of the second sub-display part SPD2 through the second circuit layer 118. In other words, the first driving element 114 is electrically connected to the first and third display units DU1 and DU3 which straddle the two sides thereof, and the second driving element 114 is electrically connected to the second and fourth display units which straddle the two sides thereof. Unit DU2, DU4.

For a brief illustration, FIG. 2 and FIG. 3 show the arrangement of elements in one display area DR, and other display areas DR can be deduced by analogy, and will not be repeated here.

The technical effects of the display panel 100 of this embodiment will be described in detail in the following paragraphs.

In the process of displaying images, the current detection circuit ID in each display area DR will detect its second sub-display part SDP2. In detail, the current detection circuit ID determines whether the second sub-display part SDP2 has dead pixels according to the current magnitude of each corresponding light-emitting element E passing through each display unit DU in the second sub-display part SDP2.

The current detection circuit ID will first detect the second sub-display part SPD2 The current magnitude of each light-emitting element E in each display unit DU (that is, in the second and fourth display units DU2 and DU4). If the current passing through the light emitting element E is less than a preset threshold, it is defined that the corresponding light emitting element E is damaged. In this embodiment, as long as the current of any light emitting element E in the second and fourth display units DU is smaller than the threshold, it is defined that the second sub-display part SDP2 has dead pixels. As shown in FIG. 4, the second driving element 114 stops driving the second sub-display part SDP2 and sends an on signal to turn on the first driving element 112 located below it, so that the first driving element 112 drives the first sub-display part SDP1 can display an image frame.

On the other hand, if after detection by the current detection circuit ID, it is found that the current of any one of the light-emitting elements E in the second and fourth display units DU is greater than or equal to the threshold, it is defined that the second sub-display part SDP2 does not have dead pixels . As shown in FIG. 5, the second driving element 114 drives the second sub-display part SDP2 to display the image frame.

In view of the foregoing, in the display panel 100 of this embodiment, each display area DR is provided with a first sub-display portion SDP1 and a second sub-display portion SDP2. The first sub-display portion SDP1 serves as a backup display portion, and the The two sub-display part SDP2 serves as the main display part, for example. If the current detection circuit ID detects that the second sub-display part SDP2 has dead pixels, the second driving element 114 stops driving the second sub-display part SDP2, and turns on the first driving element 112 to drive the first sub-display part SDP1 to display Video screen. If the current detection circuit ID detects that the second sub-display portion SDP2 does not have dead pixels, the second sub-display portion SDP2 is maintained to display the image.

Therefore, if in the manufacturing process, if the light-emitting element E itself or the first The second driving element 114 itself is damaged due to the manufacturing process or other factors. The display panel 100 of this embodiment can ensure that there is a sub-display part SDP in each display area DR to display an image. In this way, the display panel 100 of this embodiment can greatly reduce the probability that the display area DR cannot be displayed, and therefore it has a good display quality.

Moreover, in a general display device, if the display part of the display area has dead pixels, it is usually an action of replacing the light-emitting element or the driving element on the display area so that the corresponding display area can display an image. However, the display panel 100 of this embodiment can detect whether the second sub-display part SDP2 has dead pixels through a self-detection mechanism, and whether there are dead pixels or not, it can ensure that each display area DR can display images. . Therefore, the display panel 100 of the present embodiment improves the probability that each display area DR can display an image frame, and at the same time avoids the removal and replacement of the driving element or the light-emitting element, thereby providing user convenience.

In this embodiment, each display area DR is provided with first and second driving elements 112, 114 to drive one of the first and second sub-display parts SDP1 and SDP2 to display images, so the display panel 100 can Display the screen regionally. For example, the display device 100 can control a single display area DR to display an image frame, or can control multiple display areas DR located at different locations to display an image frame, and the present invention is not limited to this. In other embodiments, the display panel may also have a non-display area (or frame area) surrounding the display areas DR, where the non-display area may be provided with the first and second driving elements 112 that drive all the display areas DR. , 114, the invention is not limited to this.

Moreover, in this embodiment, these first circuit layers 116 are, for example, mutually Physically separate. In other embodiments, these first circuit layers 116 may also be interconnected with each other, and those skilled in the art can design circuits correspondingly according to their own needs, and the present invention is not limited to this.

3 again, in this embodiment, the first driving element 112 for controlling the first sub-display part SPD1 (backup display part) is disposed on the first surface S1 of the driving substrate 110 facing the backside BS, so the first A driving element 112 does not affect the aperture ratio of the display area DR. Moreover, in this embodiment, the orthographic projection of the first driving element 112 on the driving substrate 110 overlaps the orthographic projection of the second driving element 114 on the driving substrate 110. In this way, the purpose of saving installation space can be achieved.

Referring to FIG. 6, in any two adjacent display areas DR along the arrangement direction AD of the display units DU, one of the two adjacent display areas DR (for example, the display area DR on the left in FIG. 6) The four display unit DU4 is located between its third display unit DU3 and the first display unit DU1 of the other of the two adjacent display areas DR (for example, the display area DR on the right in FIG. 6). Therefore, the bright spots in the display screen will not be too far away.

FIG. 7 is a schematic flowchart of a driving method of a display panel according to an embodiment of the present invention.

Please refer to FIG. 7, step S100: the multiple sub-display portions SDP in each display area DR of the display panel 100 are divided into a first sub-display portion SDP1 and a second sub-display portion SDP2, so that the first sub-display portion The SDP1 and the second sub-display part SDP2 have different electrical connections.

Step S200: Detecting the in each display area DR of the display panel 100 The second sub-display part SDP2 has dead pixels. If so, the second sub-display part SDP2 is closed, and the first sub-display part SDP1 is driven to display an image frame. If not (that is, the second sub-display portion SDP2 does not have dead pixels), the second sub-display portion SDP2 is driven to display the image frame.

The method of detecting dead pixels further includes: determining whether the current of each light-emitting element E corresponding to each display unit DU in the second sub-display portion SDP2 in each display area DR exceeds a threshold to determine the second The sub-display part SPD2 has dead pixels. If the current is greater than or equal to the threshold, it is determined that the second sub-display part SDP2 does not have dead pixels. If the current is smaller than the threshold, it is determined that the second sub-display part SDP2 has dead pixels.

In summary, in the display panel of the embodiment of the present invention, each display area is provided with a first sub-display portion as a backup display portion and a second sub-display portion as a main display portion. If the current detection circuit detects If the second sub-display part has dead pixels, the second driving element closes the second sub-display part, and informs the first driving element to drive the first sub-display part to display the image frame. If not, the second driving element drives the second sub-display part and drives the second sub-display part to display the image frame. In this way, the display panel of the embodiment of the present invention can ensure that there is a sub-display part in each display area to display the image frame, and reduce the probability that the display area cannot be displayed. Therefore, the display panel of the embodiment of the present invention has good display quality. For similar reasons, the driving method of the display panel of the embodiment of the present invention can provide good display quality of the display panel.

Although the present invention has been disclosed as above by embodiments, it is not intended to limit the Inventions, any person with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of protection of the invention shall be defined by the scope of the appended patent application. quasi.

100: display panel 110: Drive substrate 112: The first drive element 114: The second drive element 116: The first circuit layer 118: The second circuit layer A-A’: Section BS: back side DP: display part DS: Display side DR: display area DU: display unit DU1~DU4: the first display unit ~ the fourth display unit H: Conductive through hole ID: Current detection element S1: First surface S2: second surface SDP1: The first sub-display part SDP2: The second sub-display part

Claims (10)

A display panel having multiple display areas, the display panel including: A driving substrate having a first surface and a second surface opposite to each other, the driving substrate including: A plurality of first driving elements arranged on the first surface; and A plurality of second driving elements are disposed on the second surface, and each of the second driving elements includes a current detection circuit; and A plurality of display parts are arranged on the first surface, each of the display parts includes a plurality of sub-display parts, each of the sub-display parts includes a plurality of display units, each of the display units includes a plurality of light-emitting elements, the sub-displays The part further includes a first sub-display part and a second sub-display part, among them, In each of the display areas, a first driving element, a second driving element, and a display part are provided, and the corresponding first driving element is electrically connected to the first sub-display part, and corresponding The second driving element is electrically connected to the second sub-display part, The current detection circuit determines whether the second sub-display part has dead pixels according to the current magnitude of each light-emitting element corresponding to each display unit in the second sub-display part, If so, the second driving element stops driving the second sub-display part and sends an on signal to notify the first driving element, so that the first driving element drives the first sub-display part to display an image frame; If not, the second driving element drives the second sub-display part to display the image frame. The display panel described in item 1 of the scope of patent application, wherein, in each display part, The display units include a first display unit, a second display unit, a third display unit, and a fourth display unit, The second display unit is located between the first display unit and the third display unit, and the third display unit is located between the second display unit and the fourth display unit, among them, The first sub-display part includes the first display unit and the third display unit, The second sub-display part includes the second display unit and the fourth display unit. The display panel described in item 2 of the scope of patent application, wherein: In any two adjacent display areas along the arrangement direction of the display units, The fourth display unit of one of the two adjacent display areas is located between the third display unit and the first display unit of the other of the two adjacent display areas. According to the display panel described in claim 1, wherein the orthographic projection of the first driving element on the driving substrate overlaps the orthographic projection of the second driving element on the driving substrate. According to the display panel described in item 1 of the scope of patent application, the driving substrate further includes: A plurality of first circuit layers are arranged on the first surface, wherein each of the display areas is provided with a first circuit layer, the first circuit layer and the first driving element, the first display unit and the The third display unit is electrically connected; and A plurality of second circuit layers are arranged on the second surface, wherein each of the display areas is provided with a second circuit layer, the second circuit layer and the second driving element, the second display unit and the The fourth display unit is electrically connected. As for the display panel described in claim 5, the driving substrate further includes a plurality of conductive through holes, and a part of the conductive through holes is provided in each display area, and the first circuit layer The part is electrically connected to the first display part and the third display part. In the display panel described in the first item of the scope of patent application, the light-emitting colors of the light-emitting elements are different from each other. For the display panel described in item 7 of the scope of patent application, the types of the light-emitting elements include micro light-emitting diodes or sub-millimeter light-emitting diodes. A driving method of a display panel includes: The multiple sub-display portions in each display area of a display panel are divided into a first sub-display portion and a second sub-display portion, so that the first sub-display portion and the second sub-display portion have different electrical characteristics. Sexual connection; and Detecting whether the second sub-display part in each display area of the display panel has dead pixels, If yes, turn off the second sub-display part, and drive the first sub-display part to display an image frame; If not, the second sub-display part is driven to display the image frame. According to the driving method described in claim 9, wherein each of the sub-display parts further includes a plurality of light-emitting elements, and the second sub-display part in each of the display areas of the display panel is detected to be defective The steps to point further include: By determining whether the current of each light-emitting element corresponding to each display unit in the second sub-display portion in each display area exceeds a threshold to determine whether the second sub-display portion has dead pixels, If the current is greater than or equal to the threshold, it is determined that the second sub-display part does not have dead pixels, If the current is smaller than the threshold, it is determined that the second sub-display part has dead pixels.

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