TWI656522B - Driving device driving module and driving method - Google Patents

Abstract

A driving module for a display device includes a plurality of first driving units, and generates a plurality of data driving signals to a plurality of data lines of the display device according to the plurality of first control signals; a plurality of second driving units Generating a plurality of gate driving signals to the plurality of scan lines of the display device according to the plurality of second control signals; and a control unit for determining the plurality of data line loads corresponding to the plurality of data lines The driving capability of the plurality of data driving signals to generate the plurality of first control signals, or to determine the driving capability of the plurality of gate driving signals according to the plurality of scanning line loads corresponding to the plurality of scanning lines to generate the A plurality of second control signals.

Description

Driving module and driving method of display device

The present invention relates to a driving module for a display device and a related driving method, and more particularly to a driving module and a related driving method for adjusting a driving capability of a driving signal according to a load of the display device.

Liquid crystal displays (LCDs) have the advantages of light and thin, low radiation, small size, and low power consumption. They are widely used in information products such as notebook computers or flat-screen televisions. Therefore, the liquid crystal display has gradually replaced the traditional cathode ray tube display (Cathode Ray Tube Display) into the market mainstream, of which the active matrix thin film transistor liquid crystal display (Active Matrix TFT LCD) is the most popular. The driving system of the active matrix thin-film transistor liquid crystal display is mainly composed of a timing controller, a source driver, and a gate driver. The source driver and the gate driver control the data line and the scan line, respectively, which cross each other on the panel to form a cell matrix, and each cell includes liquid crystal molecules and transistors. The display principle of the liquid crystal display is that the gate driver sends the scanning signal to the gate of the transistor, so that the transistor is turned on. At the same time, the source driver converts the data sent by the timing controller into an output voltage, and then transmits the output voltage to the transistor. The source of the crystal. At this time, the voltage at one end of the liquid crystal will be equal to the voltage of the drain of the transistor, and the tilt angle of the liquid crystal molecules will be changed according to the voltage of the drain to change the transmittance to achieve the purpose of displaying different colors.

Generally speaking, a gate driver or a source driver in a liquid crystal display has the same ability to drive each load to drive a transistor or a liquid crystal molecule on a scan line or a data line. However, as panel devices of various shapes are gradually applied to different information products, the loads on various positions on the same panel may not be exactly the same, thereby affecting the operation of the drive system. Although US Publication No. US9319036 or Publication No. US20050169075 discloses methods for adjusting the driving capability of a gate driver or a source driver, it cannot solve the problem of load difference due to different positions on the panel. Therefore, how to reduce the influence caused by the load change of the panel in the liquid crystal display has become an issue that the industry is eager to discuss.

In order to solve the above-mentioned problems, the present invention provides a driving module and a related driving method for adjusting a driving capability of a driving signal according to a load of a display device.

The present invention discloses a driving module for a display device. The driving module includes a plurality of first driving units, and generates a plurality of data driving signals to a plurality of data lines of the display device according to the plurality of first control signals. ; A plurality of second driving units, generating a plurality of gate driving signals to the plurality of scanning lines of the display device according to the plurality of second control signals; and a control unit, according to the plurality of corresponding data lines Data line load to determine the driving capability of the plurality of data driving signals to generate the plurality of first control signals, or to determine the plurality of gate driving signals according to the plurality of scanning line loads corresponding to the plurality of scanning lines Driving capability to generate the plurality of second control signals.

The invention further discloses a driving method for a driving module in a display device. The driving method includes determining whether the plurality of data line loads corresponding to the plurality of data lines or the plurality of data lines are scanned. The plurality of scanning line loads corresponding to the trace; determining the driving capability of the plurality of data driving signals and the plurality of gate driving signals according to the plurality of data line loads and the plurality of scanning line loads; and according to the plurality of data driving signals And the driving capability of the plurality of gate driving signals to generate a plurality of first control signals and a plurality of second control signals.

10, 20, 30, 40, 60, 70‧‧‧ display devices

100‧‧‧ Panel

102‧‧‧Driver Module

80‧‧‧Drive method

802, 804, 806‧‧‧ steps

CON‧‧‧ Control Unit

CON_S, CON_S1 ~ CON_Sm‧‧‧The first control signal

CON_G, CON_G1 ~ CON_Gn‧‧‧Second control signal

DRI_S‧‧‧First drive circuit

DRI_G‧‧‧Second driving circuit

DRI_S1 ~ DRI_Sm, DRI_SG1 ~ DRI_Gn‧‧‧Drive unit

S1 ~ Sm‧‧‧ Data Driven Signal

G1 ~ Gn‧‧‧Gate drive signal

DL_1 ~ DL_m‧‧‧Data line

SL1 ~ SLn‧‧‧Scan line

PIX_1_1 ~ PIX_m_n‧‧‧ pixels

DLD_1 ~ DLD_m‧‧‧Data line load

SLD_1 ~ SLD_n‧‧‧Scan line load

OC, OC_S‧‧‧ output circuit

OP‧‧‧Amplifier

M‧‧‧ Transistor

IBIAS‧‧‧Current Bias Signal Source

t‧‧‧ arrival time

FIG. 1 is a schematic diagram of a display device according to a first embodiment of the present invention.

2 to 4, 6 and 7 are schematic diagrams of another display device according to an embodiment of the present invention.

FIG. 5 is a schematic diagram of climb times of different scan line loads according to an embodiment of the present invention.

FIG. 8 is a flowchart of a driving method according to an embodiment of the present invention.

Please refer to FIG. 1, which is a schematic diagram of a display device 10 according to an embodiment of the present invention. The display device 10 may be an electronic product with a display panel, such as a smart phone, a tablet computer, a notebook computer, or a wearable device, and the detailed composition method or architecture thereof varies according to different applications. For brevity, FIG. 1 only shows a panel 100 and a driving module 102 of the display device 10, and other components, such as a housing and a connection interface, which are not directly related to the concept of the present invention are omitted. The panel 100 includes scan lines SL1 to SLn and data lines DL_1 to DL_m. Wherein, each boundary of the scan lines SL1 to SLn and the data lines DL_1 to DL_m is respectively coupled to the pixels PIX_1_1 to PIX_m_n. The operation principle of the panel 100 should be familiar to those having ordinary knowledge in the art, and is not repeated here. The driving module 102 includes a control unit CON, a first driving circuit DRI_S, and a second driving circuit DRI_G. The control unit CON is used to generate a first control signal CON_S and a second control signal CON_G. The first driving circuit DRI_S is used to generate data driving signals S1 to Sm according to the first control signal CON_S to drive the data lines DL_1 to DL_m. Second drive electric The path DRI_G is used to generate gate driving signals G1 ~ Gn according to the second control signal CON_G to drive the scanning lines SL1 ~ SLn. Since the load of each pixel on each panel may not be completely the same due to differences in panel shapes or processes, the loads of each scan line SL1 ~ SLn and each data line DL_1 ~ DL_m are also not the same. For example, when a panel is circular, oval, or irregular, for the first driving circuit DRI_S, the load of the pixels PIX_1_1 ~ PIX_m_1 in the first row and the pixels PIX_2_1 ~ PIX_m_2 in the second row The load may be different. Therefore, in order to avoid the abnormal operation of the panel 100 caused by different load sizes of pixels on the panel, the control unit CON determines the driving of the first driving circuit DRI_S for each data line DL_1 ~ DL_m according to the load corresponding to each data line DL_1 ~ DL_m. Capacity and generate the first control signal CON_S accordingly; at the same time, the control unit CON may also determine the driving capability of the second driving circuit DRI_G for each scanning line SL1 ~ SLn according to the load corresponding to each scanning line SL1 ~ SLn And generate a second control signal CON_G accordingly. In this way, the control unit CON can adjust the driving capability to be suitable for various shapes of display devices.

In detail, please refer to FIG. 2, which is a schematic diagram of a display device 20 according to an embodiment of the present invention. For brevity, FIG. 2 only shows the control unit CON, the first driving circuit DRI_S, and the data line loads DLD_1 to DLD_m of several driving units DRI_S1 to DRI_Sm corresponding to the first driving circuit DRI_S, and the rest are like the second driving circuit. DRI_G, data lines DL_1 ~ DL_m, scan lines SL1 ~ SLn, and pixels PIX_1_1 ~ PIX_m_n are not shown in the figure. In this embodiment, the control unit CON determines the driving capability of the data driving signals S1 to Sm according to the data line load DLD_1 to DLD_m corresponding to the data lines DL_1 to DL_m to generate the first control signals CON_S1 to CON_Sm. Among them, the first control The signals CON_S1 ~ CON_Sm can be realized by a digital code, a voltage signal or a current signal. That is, for data line loads DLD_1 ~ DLD_m with different loads, the control unit CON can adjust the driving capabilities of the driving units DRI_S1 ~ DRI_Sm through the first control signals CON_S1 ~ CON_Sm, respectively. Specifically, because the load of the corresponding pixels on each data line DL_1 ~ DL_m is different, Load line load DLD_1 ~ DLD_m are also different. For example, when the load on the pixels PIX_1_1 ~ PIX_1_n is low (for example, near the edge area of the circular panel), the data line load DLD_1 is low, and the control unit CON adjusts the first control signal CON_S1 accordingly, so that the driving unit DRI_S1 Generate a data driving signal S1 with a lower driving capability; or, when the load on the pixels PIX_2_1 ~ PIX_2_n is high (for example, near the central area of a circular panel), the data line load DLD_2 is higher, and the control unit CON adjusts the first accordingly The control signal CON_S2 generates a data driving signal S2 with a higher driving capability, and so on. Therefore, the control unit CON can control each driving unit DRI_S1 ~ DRI_Sm to generate a corresponding data driving signal S1 ~ Sm to individually adjust the driving capability of each driving unit DRI_S1 ~ DRI_Sm. It is worth noting that the control unit CON can not only individually adjust the driving capability of the corresponding data line DL_1 ~ DL_m for the data line load DLD_1 ~ DLD_m, but also perform grouping based on the load of the data line load DLD_1 ~ DLD_m, and then use the group as a unit Adjust the driving capability of the corresponding data lines DL_1 ~ DL_m, but not limited to this.

In addition, in addition to the actual measurement of the data line load DLD_1 ~ DLD_m, the control unit CON can also measure the stability or climb time of the data line load DLD_1 ~ DLD_m after receiving the data drive signals S1 ~ Sm. Determine the data line load DLD_1 ~ DLD_m and evaluate whether the driving capability of the data drive signals S1 ~ Sm to the data line load DLD_1 ~ DLD_m is appropriate, so as to determine the first control signal CON_S1 ~ CON_Sm, so as to generate a suitable data drive signal S1 ~ Sm.

In another embodiment, please refer to FIG. 3, which is a schematic diagram of a display device 30 according to an embodiment of the present invention. For the sake of brevity, FIG. 3 only shows the control unit CON, the several drive units DRI_S1 ~ DRI_Sm of the first drive circuit DRI_S, and the data line loads DLD_1 ~ DLD_m corresponding to the drive units DRI_S1 ~ DRI_Sm, and the rest are like the second drive circuit. DRI_G, data lines DL_1 ~ DL_m, scan lines SL1 ~ SLn, and pixels PIX_1_1 ~ PIX_m_n are not shown in the figure. Control unit CON according to the data line The data line loads DLD_1 ~ DLD_m corresponding to DL_1 ~ DL_m determine the driving capability of the data drive signals S1 ~ Sm to generate the first control signals CON_S1 ~ CON_Sm. In this embodiment, the first control signals CON_S1 ~ CON_Sm are implemented by a current signal to control the driving units DRI_S1 ~ DRI_Sm using the current signal. Specifically, as shown in FIG. 3, each of the driving units DRI_S1 ~ DRI_Sm can be implemented by an output circuit OC, and the output circuit OC can be a Class AB Amplifier, but it is not limited to this. It includes a current bias signal source IBIAS, an amplifier OP, and a plurality of transistors M. The current bias signal source IBIAS of the output circuit OC can be controlled by the first control signal CON_S with different current signals to individually adjust the driving capabilities of the driving units DRI_S1 ~ DRI_Sm. Because only one current signal is needed to set the driving capability of each driving unit DRI_S1 ~ DRI_Sm, in this embodiment, the circuit area can be greatly saved, and different first control signals CON_S1 ~ CON_Sm can be achieved to control the driving separately. Units DRI_S1 ~ DRI_Sm. It is worth noting that the above current signal can also be converted into a voltage signal and then input as the first control signal CON_S to the driving units DRI_S1 ~ DRI_Sm.

In addition, please continue to refer to FIG. 4, which is a schematic diagram of a display device 40 according to an embodiment of the present invention. For brevity, FIG. 4 only shows the control unit CON, the driving units DRI_G1 ~ DRI_Gn of the second driving circuit DRI_G, and the scanning line loads SLD_1 ~ SLD_n corresponding to the driving units DRI_G1 ~ DRI_Gn, and the rest are the same as the first driving circuit. DRI_S, data lines DL_1 ~ DL_m, scan lines SL1 ~ SLn, and pixels PIX_1_1 ~ PIX_m_n are not shown in the figure. The control unit CON determines the driving capability of the gate driving signals G1 to Gn according to the scanning line loads SLD_1 to SLD_n corresponding to the scanning lines SL1 to SLn, so as to generate the second control signals CON_G1 to CON_Gn. In this embodiment, the second control signals CON_G1 ~ CON_Gn are implemented by a current signal to control the second driving circuit DRI_G. Similarly, the current signal can also be converted into a voltage signal and then input as the second control signals CON_G1 ~ CON_Gn to the driving units DRI_G1 ~ DRI_Gn. Specifically, since each scan line loads SLD_1 ~ SLD_n is different. When the load is large, the climbing time is longer; when the load is lower, the climbing time is shorter. That is, the climbing time corresponding to each scan line load SLD_1 ~ SLD_n is different. In this case, the second driving circuit DRI_G and the first driving circuit DRI_S will not be able to cooperate in timing, and the operation of the panel 100 will be abnormal. Therefore, the control unit CON can determine the driving capability of the gate driving signals G1 to Gn according to the scan line loads SLD_1 to SLD_n, and then generate a second control signal CON_G1 to CON_Gn to adjust its climb for the scan line loads SLD_1 to SLD_n of different loads time. As shown in FIG. 5, FIG. 5 is a schematic diagram of climb times of different scan line loads according to an embodiment of the present invention. The driving circuit DRI_G sets different intermediate voltage times (ie, EQ state times) according to the second control signals CON_G1 ~ CON_Gn, so that the in-position times t of the different scanning line loads are the same. In this case, even if the climb time of each scan line load SLD_1 ~ SLD_n is different, the in-position time t of each scan line load SLD_1 ~ SLD_n can be made the same by extending or shortening the intermediate voltage time. In this way, the control unit CON can adaptively adjust its driving capability for each scan line load.

Similarly, in addition to actually measuring the values of the scan line loads SLD_1 ~ SLD_n, the control unit CON can also determine the load of the scan line loads SLD_1 ~ SLD_n and evaluate the gate based on a stability or a climb time of the scan line loads SLD_1 ~ SLD_n Whether the driving capability of the gate driving signals G1 ~ Gn to the scanning line loads SLD_1 ~ SLD_n is appropriate, so as to determine the second control signals CON_G1 ~ CON_Gn, thereby generating appropriate gate driving signals G1 ~ Gn.

In another embodiment, please refer to FIG. 6, which is a schematic diagram of a display device 60 according to an embodiment of the present invention. For brevity, FIG. 6 only shows the control unit CON, several driving units DRI_S1 ~ DRI_Sm of the first driving circuit DRI_S, and the data line loads DLD_1 ~ DLD_m corresponding to the driving units DRI_S1 ~ DRI_Sm, and the rest are like the second driving circuit DRI_G, data lines DL_1 ~ DL_m, scan lines SL1 ~ SLn, and pixels PIX_1_1 ~ PIX_m_n are not shown in the figure. As shown in FIG. 6, each driving unit DRI_S1 ~ DRI_Sm can be implemented by an output circuit OC_S, among which the output circuit OC_S can be It is composed of one or more output circuits OC in FIG. 3 and includes output stages with different transistor sizes to drive corresponding data line loads DLD_1 to DLD_m. In this way, the control unit CON can determine the driving capability of the driving units DRI_S1 ~ DRI_Sm according to the data line load DLD_1 ~ DLD_m, and adjust the middle of each data line load DLD_1 ~ DLD_m by selecting the size of the output stage of the corresponding output circuit OC_S The voltage time makes the in-position time t of each data line load DLD_1 ~ DLD_m the same. In addition, in some embodiments of the present invention, the control unit CON can also control the driving capability of the driving units DRI_S1 ~ DRI_Sm by adjusting the slew rates of the aforementioned output circuits OC and OC_S.

In order to reduce the complexity of the circuit layout of the display device, or adjust its circuit layout adaptively according to the shape of the panel 100, in one embodiment, the data line loads DLD_1 ~ DLD_m or the scan line loads SLD_1 ~ SLD_n can be divided into different groups The group is driven by the corresponding first driving circuit DRI_S or the second driving circuit DRI_G. Please refer to FIG. 7, which is a schematic diagram of a display device 70 according to an embodiment of the present invention. The display device 70 may be an electronic product having a display panel, such as a smart phone, a tablet computer, a television, a notebook computer, or a wearable device, or a driving circuit for driving the display panel, and is not limited thereto. The display device 70 is similar to the display devices 10, 20, 30, and 60 shown in FIG. 1 to FIG. 3 and FIG. 6, and therefore components and signals having similar functions use the same symbols. In this embodiment, two adjacent data line loads DLD_1 and DLD_2 in the circuit layout are divided into a group DG1, and the driving units DRI_S1 corresponding to the two data line loads DLD_1, DLD_2 and the data line loads DLD_1 and DLD_2 The data driving signals S1 and S2 generated by DRI_S2 are controlled by the same first control signal CON_S1. Similarly, two adjacent data line loads DLD_3, DLD_4 are divided into a group DG2, and so on. In this way, compared with the display devices 10, 20, 30, and 60, the number of control signals output by the control unit CON in the display device 70 can be reduced to m / 2. In addition, the classification of the data line loads DLD_1 and DLD_2 can also be adjusted according to the shape of the panel 100. For example, when the panel 100 is a circle When it is shaped, the load of the symmetrical and circular data line load DLD_1 and the data line load DLD_m may be similar or the same. Therefore, the data line load DLD_1 and the data line load DLD_m can be divided into the same group, thereby reducing the drive unit DRI_S. Quantity. Similarly, for the driving unit DRI_G, the scan line loads SLD_1 to SLD_n can also be implemented in a grouped manner, thereby reducing the number of control signals output by the control unit CON.

The above control unit CON determines the driving process of the corresponding data driving signals S1 to Sm or gate driving signals G1 to Gn according to the data line load DLD_1 ~ DLD_m or the scan line load SLD_1 ~ SLD_n, which can be summarized as a driving method 80 , As shown in Figure 8. The driving method 80 is used for a driving module of a display device (such as an electronic product with a display panel such as a smart phone, a tablet computer, a notebook computer, or a wearable device), and includes the following steps: Step 802: Determine the data line DL_1 The data line loads corresponding to ~ DL_m are DLD_1 ~ DLD_m, or the scan line loads corresponding to scan lines SL1 ~ SLn are SLD_1 ~ SLD_n.

Step 804: Determine the driving capability of the data driving signals S1 ~ Sm or the gate driving signals G1 ~ Gn according to the data line loads DL_1 ~ DL_m and the scanning line loads SLD_1 ~ SLD_n.

Step 806: Generate the first control signal CON_S or the second control signal CON_G according to the driving capabilities of the data driving signals S1 ~ Sm or the gate driving signals G1 ~ Gn.

According to the driving method 80, the display device can determine the driving capability of the data driving signal or the gate driving signal through the data line load or the scanning line load to generate a control signal to adjust the corresponding driving capacity. In this way, it is possible to avoid driving all pixels on the panel with the same driving capability, resulting in abnormal operation.

From the above, it can be known that the embodiments of the present invention can adjust the driving capability of the driving unit to When faced with different loads, all the pixels of the panel achieve consistent charging and driving capabilities. It should be noted that the foregoing embodiments are used to illustrate the spirit of the present invention, and those skilled in the art can make appropriate modifications based on this, but not limited to this. For example, not only the driving capabilities of the first driving circuit DRI_S and the second driving circuit DRI_G can be adjusted, but also the driving capabilities of the first and second driving circuits DRI_S and DRI_G can be adjusted at the same time, so that the data lines DL_1 ~ DL_m and scanning The lines SL1 ~ SLn together achieve consistent charging and driving capabilities. Alternatively, the first and second driving circuits DRI_S and DRI_G can be implemented in the same integrated circuit (IC) or in different ICs, respectively, or through adjustment. The input stage and slew rate of the AB amplifier of the output circuit, so as to adjust the driving capability of the driving unit, can be adjusted according to the computer system architecture or requirements, which all belong to the scope of the present invention.

The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the scope of patent application of the present invention shall fall within the scope of the present invention.

Claims (14)

A driving module for a display device. The driving module includes: a plurality of first driving units, and generates a plurality of data driving signals to a plurality of data lines of the display device according to the plurality of first control signals; Two second driving units, generating a plurality of gate driving signals to the plurality of scanning lines of the display device according to the plurality of second control signals; and a control unit, according to the plurality of data corresponding to the plurality of data lines The line load determines the driving capability of the plurality of data driving signals to generate the plurality of first control signals, or determines the driving of the plurality of gate driving signals according to the plurality of scanning line loads corresponding to the plurality of scanning lines. Ability to generate the plurality of second control signals; wherein the plurality of data line loads and the plurality of scan line loads are related to a plurality of pixels of the display device. The driving module according to claim 1, wherein the first control signal or the second control signal is a digital code, a voltage signal, or a current signal. The driving module according to claim 1, wherein the control unit determines the stability of the plurality of data driving signals or the plurality of gate driving signals according to a stability of the plurality of data line loads or the plurality of scanning line loads. Driving capability to generate the plurality of first control signals or the plurality of second control signals. The driving module according to claim 1, wherein the control unit determines the data driving signals or the gate driving signals based on a climbing time of the plurality of data line loads or the plurality of scanning line loads. Driving capability to generate the plurality of first control signals or the plurality of second control signals. The driving module according to claim 1, wherein the first driving unit or the second driving unit includes output stages having different transistor sizes, and the first control signal or the second control signal controls the first driving unit Or the second drive unit selects the size of the output stage. The driving module according to claim 1, wherein the first control signal controls one of the first driving units to generate a data driving signal; or the second control signal controls one of the second driving units to generate a gate driving Signal. The driving module according to claim 1, wherein the first control signal controls the plurality of first driving units to generate a plurality of data driving signals; or the second control signal controls the plurality of second driving units to generate a plurality of data driving signals. Gate drive signal. A driving method for a driving module of a display device, wherein the display device includes a plurality of data lines and a plurality of scanning lines, and the driving method includes: determining a plurality of data lines corresponding to the plurality of data lines Load, or the plurality of scan line loads corresponding to the plurality of scan lines; determining the driving capabilities of the plurality of data drive signals and the plurality of gate drive signals according to the plurality of data line loads and the plurality of scan line loads; And generating a plurality of first control signals and a plurality of second control signals according to the driving capabilities of the plurality of data driving signals and the plurality of gate driving signals; wherein the plurality of data line loads and the plurality of scan line loads are related A plurality of pixels on the display device. The driving method according to claim 8, wherein the first control signal or the second control signal is a digital code, a voltage signal, or a current signal. The driving method according to claim 8, wherein the control unit determines the driving of the plurality of data driving signals or the plurality of gate driving signals according to a stability of the plurality of data line loads or the plurality of scanning line loads. Ability to generate the first control signal or the plurality of second control signals. The driving method according to claim 8, wherein the control unit determines the driving of the plurality of data driving signals or the plurality of gate driving signals according to a climbing time of the plurality of data line loads or the plurality of scanning line loads. Ability to generate the first control signal or the plurality of second control signals. The driving method according to claim 8, wherein the control unit outputs the first control signal or the second control signal to the first driving unit or the second driving unit, and the first driving unit or the second driving unit It includes output stages with different transistor sizes. The first control signal or the second control signal is used to control the first driving unit or the second driving unit to select the size of the output stage. The driving method according to claim 8, wherein the first control signal controls a first driving unit to generate one of the data driving signals; or the second control signal controls a second driving unit to generate one of the gate driving signals. The driving method according to claim 8, wherein the first control signal controls a plurality of first drive units to generate a plurality of data drive signals; or the second control signal controls a plurality of second drive units to generate a plurality of brakes therein. Pole drive signal.