TWI810893B - Display driving method, OLED display device and information processing device - Google Patents

Abstract

The present invention mainly discloses a display driving method, which includes the following steps: dividing an OLED panel into at least a first display block and a second display block, so that there are J first source electrodes among N source electrode lines lines are located within the at least one first display block, and the remaining one said source lines are located within the second display block, wherein a hollowed-out area is provided in the at least one first display block; and transmitting a first data signal with a first driving capability to the J first source lines, and transmitting a second data signal with a second driving capability to the I source lines, the first The drive capability is greater than the second drive capability. The display driving method of the present invention is implemented by a display driving chip, and is used for partition display driving of an OLED panel, so that there is no brightness difference between the first display block with the hollowed out area and the second display block.

Description

Display driving method, OLED display device and information processing device

The present invention relates to the technical field of OLED display devices, in particular to a display driving method, which is implemented by a display driving chip, so as to realize partition display driving for an OLED panel.

It is known that flat panel displays include non-self-illuminating flat-panel displays and self-illuminating flat-panel displays, wherein liquid crystal displays are a kind of non-self-illuminating flat-panel displays that have been used for a long time, and organic light-emitting diodes (Organic light-emitting diode, OLED) Displays and light-emitting diode (Light-emitting diode, LED) displays are self-illuminating flat-panel displays currently in mainstream applications.

FIG. 1 is a block diagram of a conventional OLED display. As shown in FIG. 1 , the structure of the OLED display 1a mainly includes: an OLED display panel 11a and at least one display driver chip 12a, wherein the OLED panel 11a includes M×N pixel circuits 111a and M×N OLED elements 112a , M gate lines 11Ga, and N source lines 11Sa, and a pixel circuit 111a and an OLED element 112a form an OLED pixel unit, so that the OLED panel 11a includes M×N OLED pixel units. During normal operation, the display driver chip 12a receives a display data transmitted from a host computer 2a (such as: an application processor of a smart phone), and controls each of the pixel circuits 111a to operate according to the display data so that each The OLED element 112a emits light or does not emit light, thereby driving the OLED display panel 11a to display images.

As the OLED display 1a is widely used in mobile electronic devices such as smart phones, the full-screen OLED display 1a has gradually become the mainstream display architecture of smart phones. FIG. 2 is a front view of a smart phone with a full-screen display architecture. As shown in Figures 1 and 2, in the design of a smart phone 2a with a full-screen OLED display 1a, based on the needs for self-timer and video calls, it is necessary to set a hole on the OLED display panel 11a of the OLED display 1a. The region R0 is used to correspondingly expose the front camera. For example, the specially set hole-digging region R0 is between X1, X2, Y1, and Y2.

FIG. 3 is a circuit topology diagram of the pixel circuit 111a shown in FIG. 1 . As shown in FIG. 3 , the conventional pixel circuit 111 a may be, for example, a 7T1C structure, that is, including seven TFT elements ( T1 - T7 ) and one capacitor Cst. As shown in FIG. 1 and FIG. 3 , when the scan signal SCAN has a high driving capability, the data signal Data charges the node N1 and the capacitor Cst through the TFT elements T4 , T3 and T2 . Therefore, during the light-emitting stage of the OLED element, the voltage of the node N1 and the charge stored in the capacitor Cst will determine the light-emitting brightness of the OLED element 112a.

As shown in FIG. 1 , FIG. 2 and FIG. 3 , since X1 and X2 are hollowed out, there is no gate line 11Ga between X1 and X2 in the OLED display panel 11 a. Similarly, since Y1 and Y2 are hollowed out, there is no source line 11Sa between Y1 and Y2 in the OLED display panel 11a. Under this design, as shown in FIG. 2 and FIG. 1 , the line load of the gate line 11Ga located in the display block R1 must be different (less than) from that of the gate line 11Ga located in other display blocks. the wire load. Actual tests show that the charging rate of the capacitor Cst in the display area R1 is faster than that of other display areas, so that the display area R1 appears darker than other areas. Similarly, the wiring load of the source line 11Sa in the display area R2 must be different from the wiring load of the source line 11Sa in other display areas. Therefore, the actual test shows that the charging rate of the capacitor Cst in the display area R2 is faster than that of other display areas, so that the display area R2 appears darker than other areas.

Simply put, setting the hole-digging region R0 above the OLED display panel 11a will cause the line load (line load) of the gate line 11Ga in the display block R1 corresponding to the hole-digging region R0 to become smaller, and at the same time Correspondingly, the routing load of the source line 11Sa in the display block R2 of the hole-digging region R0 becomes smaller. Finally, the variation of the wiring load causes the brightness difference between the display block R1 and the display block R2 and other display blocks, and this phenomenon is called Hole Mura.

It can be seen from the above description that there is an urgent need for a new display driving method in this field.

The main purpose of the present invention is to provide a display driving method, which can be executed by a display driving chip, so as to realize the partition display driving of an OLED panel, so that the OLED panel has a hollowed-out display area during the process of displaying images. Hole mura will not appear between blocks and other normal display blocks.

To achieve the above object, the present invention proposes an embodiment of the display driving method, which is executed by at least one display driving chip to drive an OLED panel for image display, wherein the OLED panel includes M×N pixel circuits, M ×N OLED elements, M gate lines, and N source lines, and the OLED panel has a hollowed-out area, so that there are J first source lines connected to the hollowed-out area among the N source lines. an empty area, and the remaining I second source lines are not connected to the hollowed area; wherein, M, N, J, and I are all positive integers, J<I<N, and the display driving method includes: The OLED panel is divided into at least one first display block and a second display block, so that J first source lines are located in the at least one first display block, and one source line is located in the at least one first display block. the polar line is located within the second display area; and transmitting a first data signal with a first driving capability to the J first source lines, and transmitting a second data signal with a second driving capability to the I source lines, wherein the first A driving capacity is greater than the second driving capacity.

In a feasible embodiment, a total of P first gate lines among the M gate lines are connected to the hollowed out area, and the remaining Q gate lines are not connected to the hollowed out area; wherein, Both P and Q are positive integers, P<Q<M, and the display driving method further includes: At least one third display block is further divided in the second display block, so that the P first gate lines are located in the at least one third display block, and the Q gate lines are Located within the second display area, and making T second source lines among the I source lines pass through the third display area, T is a positive integer, and T<I; A third data signal with a third driving capability is transmitted to the T second source lines, and the third driving capability is greater than the second driving capability.

In one embodiment, the display driver chip has N source drivers respectively coupled to the N source lines, by adjusting at least one parameter of each source driver to make the The first data signal, the second data signal transmitted to the source line, and the third data signal transmitted to the second source line respectively have the first driving capability and the second driving capability and said third driving capability.

In a feasible embodiment, the display driver chip divides the OLED panel into K×L sub-display blocks, so that the first display block contains at least one row of L sub-display blocks in total, and the The third display block contains at least one row of K sub-display blocks in total.

The present invention also provides an OLED display device, which includes at least one display driver chip and an OLED panel, wherein the OLED panel includes M×N pixel circuits, M×N OLED elements, M gate lines, and N source line, and the OLED panel has a hollowed out area, so that among the N source lines, a total of J first source lines are connected to the hollowed out area, while the remaining I source lines are not connected to the hollowed out area. Connecting the hollowed-out area, M, N, J, and I are all positive integers, and J<I<N; it is characterized in that the display driver chip uses a display driving method to drive the OLED panel for image display, and the The display driving method includes: The OLED panel is divided into at least one first display block and a second display block, so that J first source lines are located in the at least one first display block, and one source line is located in the at least one first display block. the polar line is located within the second display area; and transmitting a first data signal with a first driving capability to the J first source lines, and transmitting a second data signal with a second driving capability to the I source lines, wherein the first A driving capacity is greater than the second driving capacity.

In a feasible embodiment, a total of P first gate lines among the M gate lines are connected to the hollowed out area, and the remaining Q gate lines are not connected to the hollowed out area; wherein, Both P and Q are positive integers, P<Q<M, and the display driving method further includes: At least one third display block is further divided in the second display block, so that the P first gate lines are located in the at least one third display block, and the Q gate lines are Located within the second display area, and making T second source lines among the I source lines pass through the third display area, T is a positive integer, and T<I; A third data signal with a third driving capability is transmitted to the T second source lines, and the third driving capability is greater than the second driving capability.

In one embodiment, the display driver chip has N source drivers respectively coupled to the N source lines, by adjusting at least one parameter of each source driver to make the The first data signal, the second data signal transmitted to the source line, and the third data signal transmitted to the second source line respectively have the first driving capability and the second driving capability and said third driving capability.

In a feasible embodiment, the display driver chip divides the OLED panel into K×L sub-display blocks, so that the first display block contains at least one row of L sub-display blocks in total, and the The third display block contains at least one row of K sub-display blocks in total.

The present invention also provides an information processing device, which has the aforementioned OLED display device of the present invention.

In one embodiment, the information processing device is selected from the group consisting of smart phones, smart watches, smart bracelets, tablet computers, notebook computers, all-in-one computers, access control devices, and electronic door locks One of the electronic devices.

In order to enable your examiners to further understand the structure, features, purpose, and advantages of the present invention, drawings and detailed descriptions of preferred specific embodiments are hereby attached.

The invention provides a display driving method, which is executed by a display driving chip, so as to realize partition display driving for an OLED panel, so that Hole Mura does not appear in the process of displaying images on the OLED panel.

FIG. 4 is a block diagram of an OLED display applying a display driving method of the present invention. As shown in FIG. 4 , the structure of the OLED display 1 mainly includes at least one display driver chip 12 and an OLED panel 11, wherein the OLED panel 11 includes M×N pixel circuits 111, M×N OLED elements 112, M Gate lines 11G and N source lines 11S, and one pixel circuit 111 and one OLED element 112 constitute an OLED pixel unit, so that the OLED panel 11 includes M×N OLED pixel units.

FIG. 5 is a first front view of a smart phone with a full-screen display architecture. In more detail, the smart phone 2 shown in FIG. 5 includes the OLED display 1 shown in FIG. The source line 11S is represented by a dark gray line. As shown in Figures 4 and 5, in the design of a smart phone 2 with a full-screen OLED display 1, based on the needs of self-timer and video calls, it is necessary to set a hole on the OLED display panel 11 of the OLED display 1. The area D0 is used to correspondingly expose the front camera. For example, the specially set hole-digging area D0 is between X1, X2, Y1, and Y2. Based on this design, among the N source lines 11S, a total of J first source lines are connected to the hollowed-out area D0, while the remaining I source lines are not connected to the hollowed-out area D0, M, N, J, and I are all positive integers, and J<I<N.

Further, FIG. 6 is a flowchart of a display driving method of the present invention. The display driving method of the present invention is executed by the display driving chip 12 having N source drivers 121 , and it can be seen from FIG. 5 that the N source drivers 121 are respectively coupled to the N source lines 11S. And, as shown in FIG. 5 and FIG. 6, the display driving method of the present invention first executes step S1: divide the OLED panel 11 into at least a first display block D1 and a second display block D2, so that N sources A total of J first source lines among the electrode lines 11S are located in the at least one first display block D1, and the remaining one source line is located in the second display block D2. Continuing, the method flow is to perform step S2: transmit a first data signal with a first driving capability to the J first source lines, and transmit a second data signal with a second driving capability to all For the one source line, the first driving capability is greater than the second driving capability, so that there is no brightness difference between the first display block D1 and the second display block D2.

As shown in FIG. 5 , the line load of the first source line located in the first display area D1 is smaller than the line load of a source line of general length located in the second display area D2 . For example, the wiring load of the source line with a general length is 1, and the wiring load of the first source line with a shorter length is 0.8. In this case, the pixel circuit located in the display block D1 The charging rate of the capacitor Cst (refer to FIG. 3 ) is faster than that of the second display block D2, so that the display block D1 appears darker than the second display block D2. At this time, the display driver chip 12 adjusts at least one parameter of each of the source drivers 121 coupled to the J first source lines, or adjusts each of the source drivers 121 coupled to the I source lines. At least one parameter of the source driver 121, so that the first data signal transmitted to the first source line and the second data signal transmitted to the source line have a first driving capability and a second driving capability capacity, and the first driving capacity is greater than the second driving capacity, so that there is no brightness difference between the first display block D1 and the second display block D2.

To illustrate in more detail, N source amplifiers 121 are coupled to N source lines 11S. In other words, the display driver chip 12 uses the source driver to transmit a data signal Data to the source terminal of the TFT element T4 through a source line 11S (refer to FIG. 3 ). When the scan signal SCAN has a high driving capability, the data signal Data charges the node N1 and the capacitor Cst through the TFT elements T4 , T3 and T2 . It can be known that the aforementioned first driving capability is greater than the second driving capability, which refers to the data driving voltage VDATA transmitted to the source terminal of the TFT element T4 by the source driver. And, in the case where the trace load of the source line is 1 and the trace load of the first source line is 0.8, let the second drive capability be 0.8 and the first drive capability be 1, or let the second drive capability be 1 and the first driving capability is 1.2, the driving capability is positively correlated with the voltage level of VDATA.

On the other hand, FIG. 7 is a second front view of a smart phone adopting a full-screen display architecture. As shown in FIG. 7 , among the M gate lines 11G, a total of P first gate lines are connected to the hollowed-out area D0, while the remaining Q gate lines are not connected to the hollowed-out area D0; Wherein, both P and Q are positive integers, and P<Q<M. Therefore, the line load of the first gate line located in the third display area D3 is smaller than the line load of the gate lines of general length located in the second display area D2. For example, the wiring load of the gate line with a general length is 1, and the wiring load of the first gate line with a shorter length is 0.9. In this case, when the OLED panel 11 is driven for image display At this time, the third display block D3 appears darker than the second display block D2.

Therefore, in a feasible embodiment, the driving method of the present invention further includes: further dividing at least one third display block D3 in the second display block D2, so that the P first gate lines Located within the at least one third display block D3, the Q gate lines 11G are located within the second display block D2, and there are T second second display lines 11S among the I source lines 11S. The source line passes through the third display block D3, T is a positive integer, and T<1.

According to this design, in the process of driving the OLED panel 11 for image display, the display driver chip 12 transmits a third data signal having a third driving capability to the T second source lines, and The third driving capability is greater than the second driving capability, so that there is no brightness difference between the second display block D2 and the second display block D3.

For example, in the case that the wiring load of the gate line 11G of general length is 1 and the wiring load of the first gate line of shorter length is 0.9, let the first gate line transmitted to the I source line The second data signal has a second drive capability, and the third data signal transmitted to the T source lines has a third drive capability, the third drive capability and the second drive capability are respectively 1 and 0.9, or the third The driving capability and the second driving capability are respectively 1.1 and 1, and the driving capability is positively correlated with the voltage level of VDATA.

It can be seen from the foregoing description that the adjustment degree of the driving capability of each of the source drivers 121 is based on the routing load of the hollowed out area D0 on the gate line 11G and the source line 11S connected thereto and other normal gate lines 11G It is determined by the difference between the wiring load of the source line 11S and the source line 11S. Simply put, the smaller the trace load the more the drive capability is adjusted upwards.

Fig. 8 is a front view of an OLED panel. Further, in a feasible embodiment, the display driver chip 12 divides the OLED panel 11 into K×L sub-display blocks in total, so that the first display block D1 contains at least one row (column) totaling L the sub-display blocks, and make the third display block D2 contain at least one row (row) of K sub-display blocks in total. It should be understood that when the OLED panel 11 is driven to display images, the first display block D1 (or the third display block D3 ) may partially display a dark picture. In this case, when the display driver chip 12 determines the first driving capability, the second driving capability and the third driving capability of the first data signal, the second data signal and the third data signal, it also depends on the The number of partitions (ie, K×L) is dynamically adjusted.

Thus, the above has completely and clearly described a display driving method of the present invention; and, through the above, it can be known that the present invention has the following advantages:

(1) The present invention discloses a display driving method, which is executed by a display driver chip, so as to realize partitioned display driving for an OLED panel, so that the OLED panel has display blocks with hollowed-out areas during the process of displaying images Hole Mura will not appear between other normal display blocks.

(2) The present invention simultaneously provides an OLED display device, which includes at least one display driver chip and an OLED panel, and is characterized in that the display driver chip uses the display driving method of the present invention as described above to drive the OLED panel Image display.

(3) The present invention also provides an information processing device having the aforementioned OLED display device of the present invention. Moreover, the information processing device is selected from the group consisting of smart phones, smart watches, smart bracelets, tablet computers, notebook computers, all-in-one computers, access control devices, and electronic door locks. electronic device.

It must be emphasized that what is disclosed in the above-mentioned case is a preferred embodiment, and all partial changes or modifications derived from the technical ideas of this case and easily deduced by those familiar with the technology are all inseparable from the patent of this case. category of rights.

To sum up, regardless of the purpose, means and efficacy of this case, it shows that it is very different from the conventional technology, and its first invention is practical, and it does meet the patent requirements of the invention. I implore your review committee to understand clearly and grant a patent as soon as possible to benefit you Society is for the Most Prayer.

1a: OLED display 11a: OLED display panel 111a: Pixel circuit 112a: OLED element 11Ga: gate line 11Sa: source line 12a: Display driver chip 2a: PC 1: OLED display 11:OLED display panel 111: Pixel circuit 112:OLED element 11G: gate line 11S: source line 12: Display driver chip 121: Source driver 2: PC S1: Divide the OLED panel into at least one first display block and a second display block, so that the J first source lines are located in the at least one first display block, and make the I line the first source line. The source line is located within the second display area S2: Transmitting a first data signal with a first driving capability to the J first source lines, and transmitting a second data signal with a second driving capability to the I source lines, wherein The first drive capability is greater than the second drive capability

FIG. 1 is a block diagram of a known OLED display; FIG. 2 is a front view of a smart phone adopting a full-screen display architecture; FIG. 3 is a circuit topology diagram of the pixel circuit shown in FIG. 1; 4 is a block diagram of an OLED display applying a display driving method of the present invention; FIG. 5 is a first front view of a smart phone adopting a full-screen display architecture; FIG. 6 is a flowchart of a display driving method of the present invention; FIG. 7 is a second front view of a smartphone employing a full-screen display architecture; and Fig. 8 is a front view of an OLED panel.

S1: Divide the OLED panel into at least one first display block and a second display block, so that the J first source lines are located in the at least one first display block, and make the I line the first source line. The source line is located within the second display area

S2: Transmitting a first data signal with a first driving capability to the J first source lines, and transmitting a second data signal with a second driving capability to the I source lines, wherein The first drive capability is greater than the second drive capability

Claims (8)

A display driving method, executed by at least one display driver chip to drive an OLED panel for image display, wherein the OLED panel includes M×N pixel circuits, M×N OLED elements, M gate lines, and N source lines, and the OLED panel has a hollowed out area, so that among the N source lines, a total of J first source lines are connected to the hollowed out area, and the remaining I source lines are connected to the hollowed out area. The hollowed-out area is not connected; wherein, M, N, J, and I are all positive integers, J<I<N, and the display driving method includes: dividing the OLED panel into at least one first display block and one second display block, making J said first source lines located in said at least one first display block, and making I said source lines located in said second display block; A first data signal with a first driving capability is sent to the J first source lines, and a second data signal with a second driving capability is sent to the I source lines, wherein the first driving The capacity is greater than the second driving capacity; wherein, among the M gate lines, a total of P first gate lines are connected to the hollowed out area, and the remaining Q gate lines are not connected to the hollowed out area ; Wherein, P and Q are both positive integers, P<Q<M, and the display driving method further includes: further dividing at least one third display block in the second display block, so that the P bars The first gate line is located in the at least one third display block, so that Q gate lines are located in the second display block, and there are T lines among the I source lines The second source line passes through the third display block, T is a positive integer, and T<1; a third data signal with a third driving capability is transmitted to the T second source lines, and The third driving capability is greater than the second driving capability. The display driving method according to claim 1, wherein the display driving chip has N source drivers respectively coupled to the N source lines, and by adjusting at least one parameter of each source driver, the The first data signal of the first source line, the second data signal transmitted to the source line, and the third data signal transmitted to the second source line respectively have the first driving capability , the second driving capability and the third driving capability. The display driving method according to claim 2, wherein the display driving chip divides the OLED panel into K×L sub-display blocks, so that the first display block contains at least one row of L sub-display blocks in total. display blocks, and make the third display block contain at least one row of K sub-display blocks in total. An OLED display device, which includes at least one display driver chip and an OLED panel, wherein the OLED panel includes M×N pixel circuits, M×N OLED elements, M gate lines, and N source lines, And the OLED panel has a hollowed out area, so that among the N source lines, a total of J first source lines are connected to the hollowed out area, while the remaining I source lines are not connected to the hollowed out area, M, N, J, and I are all positive integers, and J<I<N; it is characterized in that, the display driving chip uses a display driving method to drive the OLED panel for image display, and the display driving method includes: The OLED panel is divided into at least one first display block and a second display block, so that J first source lines are located in the at least one first display block, and one source line is located in the at least one first display block. the polar line is located within the second display area; and transmitting a first data signal with a first driving capability to the J first source lines, and transmitting a second data signal with a second driving capability to the I source lines, wherein the first A drive capability is greater than the second drive capability; wherein, among the M gate lines, a total of P first gate lines are connected to the hollowed out area, and the remaining Q gate lines are not connected to the hollowed out area. An empty area; wherein, P and Q are both positive integers, P<Q<M, and the display driving method further includes: further dividing at least one third display block in the second display block, so that P The first gate lines are located in the at least one third display block, the Q gate lines are located in the second display block, and the I source lines have T second source lines pass through the third display block, T is a positive integer, and T<1; transmit a third data signal with a third driving capability to the T second source lines , and the third driving capability is greater than the second driving capability. The OLED display device according to claim 4, wherein the display driver chip has N source drivers respectively coupled to the N source lines, and by adjusting at least one parameter of each source driver, the The first data signal of the first source line, the second data signal transmitted to the source line, and the third data signal transmitted to the second source line respectively have the first driving capability , the second driving capability and the third driving capability. The OLED display device according to claim 5, wherein the display driver chip divides the OLED panel into K×L sub-display blocks, so that the first display block contains at least one row of L sub-display blocks in total. display blocks, and make the third display block contain at least one row of K sub-display blocks in total. An information processing device having the OLED display device described in any one of claim 4 to claim 6. The information processing device as described in claim 7, wherein the information processing device is selected from smart phones, smart watches, smart bracelets, tablet computers, notebook computers, all-in-one computers, access control devices, and electronic An electronic device in the group of door locks.