CN107256698B

CN107256698B - Display panel drive circuit and its drive module, display device and manufacturing method

Info

Publication number: CN107256698B
Application number: CN201710334937.6A
Authority: CN
Inventors: 廖敏男; 苏智平
Original assignee: Sitronix Technology Corp
Current assignee: Sitronix Technology Corp
Priority date: 2013-12-06
Filing date: 2013-12-06
Publication date: 2021-04-06
Anticipated expiration: 2033-12-06
Also published as: CN107256698A

Abstract

The present invention relates to a driving circuit of a display panel, a driving module thereof, a display device and a manufacturing method thereof. The driving circuit of the display panel comprises a plurality of driving units which respectively generate a reference driving voltage according to a gamma voltage of a gamma circuit, a plurality of digital-to-analog conversion circuits which receive the reference driving voltages output by the driving units and respectively select one of the reference driving voltages as a data driving voltage according to pixel data, the digital-to-analog conversion circuits transmit the data driving voltages to the display panel to display an image, a boost circuit which generates a first supply voltage and provides the first supply voltage to the digital-to-analog conversion circuits, and at least one boost unit which generates a second supply voltage and provides the second supply voltage to the driving units, so that the driving circuit does not need an external storage capacitor to save circuit area.

Description

Driving circuit of display panel, driving module of driving circuit, display device and manufacturing method of display device

The patent is a divisional application, and the name of a parent patent is a drive circuit of a display panel, a drive module of the display panel, display equipment and a manufacturing method of the display panel, wherein the application number is 2013106627712, and the application date is 2013, 12 months and 06 days.

Technical Field

The present invention relates to a driving circuit, a driving module thereof, a display device and a manufacturing method thereof, and more particularly, to a driving circuit of a display panel, a driving module thereof, a display device and a manufacturing method thereof.

Background

Nowadays, science and technology are developed vigorously, information commodity types are developed, and different requirements of the public are met. Since the early Display is mostly a Cathode Ray Tube (CRT) Display, because it is bulky and consumes much power, and the generated radiation is dangerous for the user using the Display for a long time, the LCD (Liquid Crystal Display) is replacing the old CRT Display. The liquid crystal display has the advantages of being light, thin, short, small, low in radiation, low in power consumption and the like, and therefore, the liquid crystal display becomes the mainstream of the current market.

Furthermore, with the rapid advance of panel manufacturing technologies in recent years, the production cost of touch panels has been greatly reduced, so that touch panels are now widely used in general consumer electronics products, such as mobile phones, digital cameras, digital music players (MP3), Personal Digital Assistants (PDA), satellite navigation (GPS) and other small-sized electronic appliances, in which the touch panels are configured on the display screens of the electronic appliances for users to perform interactive input operations, thereby greatly improving the compatibility of the communication interface between people and machines and improving the input operation efficiency.

Recently, mobile phones have been developed vigorously, smart phones have been developed rapidly, and with the demand for thinner and lighter mobile phone mechanisms, the size of materials used on a panel and the number of components are required to be reduced or reduced. Furthermore, a single chip lcd driver chip module is becoming an important trend in order to make the mechanism smaller and better match, improve the yield rate of assembly, reduce the cost of the module, and reduce the external components. In addition, in order to solve the problem of a wider power supply specification, such as 2.3V to 4.6V, and to reduce the area of a driving chip for driving a display panel in the application of a single power supply for a mobile phone, manufacturers have gradually proposed a driving method capable of satisfying both requirements.

In a data driving circuit (Source driver) of a general display device, a display panel is driven by using an operational amplifier (Op-amp) or a resistance voltage division method. The driving circuit of the display panel comprises a plurality of digital-to-analog conversion circuits and a plurality of driving units. The digital-analog conversion circuits respectively receive pixel data and convert the pixel data into a pixel signal, the digital-analog conversion circuits respectively transmit the pixel signal to the driving units to generate driving signals, and the driving units respectively transmit the driving signals to the display panel to display the picture on the display panel. The driving circuit needs to be externally connected with a boost circuit, and in order to maintain the output signal level of the digital-to-analog conversion circuit, the boost circuit needs to be coupled with a storage capacitor. However, the capacitance required by the storage capacitor is large (about 0.1uF to 4.7uF), so the storage capacitor needs to use an external capacitor component, which increases the manufacturing cost, and if the storage capacitor is disposed in the driving circuit, the area of the driving circuit is further increased.

Therefore, how to provide a novel driving circuit of a display panel, a driving module thereof, a display device and a manufacturing method thereof, which can reduce the area occupied by the storage capacitor externally connected to the driving circuit, even eliminate the need for an external storage capacitor, so as to solve the above problems.

Disclosure of Invention

One of the objectives of the present invention is to provide a driving circuit of a display panel, a driving module thereof, a display device and a manufacturing method thereof, wherein a plurality of digital-to-analog conversion circuits and a plurality of driving units respectively use different supply voltages provided by a boost circuit and a boost unit, so that an area occupied by a storage capacitor externally connected to the driving circuit is reduced, even the external storage capacitor is not required, thereby achieving the purpose of saving circuit area and further achieving cost saving.

An objective of the present invention is to provide a driving circuit of a display panel, a driving module thereof, a display device and a manufacturing method thereof, in which a differential unit and an output unit of the driving units respectively use different supply voltages provided by a boosting circuit and a boosting unit to improve the stability of the output voltage of the driving units.

One of the objectives of the present invention is to provide a driving circuit of a display panel, a driving module thereof, a display device and a manufacturing method thereof, wherein the driving units are disposed between a gamma circuit and the digital-to-analog conversion circuits, so as to reduce the usage of the driving units, reduce the circuit area and further achieve the purpose of reducing the cost.

In order to achieve the above-mentioned objectives and effects, the present invention discloses a driving circuit of a display panel, which includes a plurality of driving units, a plurality of digital-to-analog conversion circuits, a voltage boosting circuit and at least one voltage boosting unit. The driving units respectively generate a reference driving voltage according to a gamma voltage of a gamma circuit, the digital-to-analog conversion circuits receive the reference driving voltages output by the driving units and respectively select one of the reference driving voltages as a data driving voltage according to a pixel data, the digital-to-analog conversion circuits transmit the data driving voltages to the display panel to display a picture, the boost circuit is used for generating a first supply voltage and providing the first supply voltage to the digital-to-analog conversion circuits, and the at least one boost unit is used for generating a second supply voltage and providing the second supply voltage to the driving units.

The invention further discloses a driving module of the display panel, which comprises a flexible circuit board and a chip. The flexible circuit board is electrically connected with the display panel, the chip is arranged on the display panel and comprises a plurality of driving units, a plurality of digital-analog conversion circuits, a booster circuit and at least one booster unit. The driving units respectively generate a reference driving voltage according to a gamma voltage of a gamma circuit, the digital-to-analog conversion circuits receive the reference driving voltages output by the driving units and respectively select one of the reference driving voltages as a data driving voltage according to pixel data, the digital-to-analog conversion circuits transmit the data driving voltages to the display panel to display a picture, the boost circuit is used for generating a first supply voltage and providing the first supply voltage to the digital-to-analog conversion circuits, and at least one boost unit is used for generating a second supply voltage and providing the second supply voltage to the driving units.

The invention also discloses a display device, which comprises a display panel, a flexible circuit board and a chip. The display panel is used for displaying an image; the flexible circuit board is electrically connected with the display panel; the chip is arranged on the display panel and generates a plurality of data driving voltages to the display panel so as to display the picture. The chip comprises a plurality of driving units, a plurality of digital-analog conversion circuits, a booster circuit and at least one booster unit. The driving units respectively generate a reference driving voltage according to a gamma voltage of a gamma circuit; the digital-analog conversion circuits receive the reference driving voltages output by the driving units, select one of the reference driving voltages as a data driving voltage according to pixel data respectively, and transmit the data driving voltages to the display panel; the boost circuit is used for generating a first supply voltage and providing the first supply voltage to the digital-to-analog conversion circuits; the at least one boosting unit is used for generating a second supply voltage and providing the second supply voltage to the driving units.

The present invention further discloses a driving circuit of a display panel, which includes a plurality of digital-to-analog conversion circuits, a plurality of driving units, a voltage boosting circuit and at least one voltage boosting unit. The digital-to-analog conversion circuits receive a plurality of gamma voltages of a gamma circuit and respectively select one of the gamma voltages as a reference driving voltage according to pixel data; the driving units respectively receive the reference driving voltages output by the digital-to-analog conversion circuits, generate a data driving voltage according to the reference driving voltage, and transmit the data driving voltage to the display panel to display a picture; the boost circuit is used for generating a first supply voltage and providing the first supply voltage to the digital-to-analog conversion circuits; the at least one boosting unit is used for generating a second supply voltage and providing the second supply voltage to the driving units, wherein the driving units comprise a differential unit and an output unit. The differential unit receives the first supply voltage to be used as a power supply of the differential unit and generates a differential voltage according to the reference driving voltage; the output unit receives the second supply voltage as a power supply of the output unit and generates a data driving voltage according to the differential voltage.

Drawings

FIG. 1 is a block diagram of a display device according to a preferred embodiment of the present invention;

FIG. 2 is a block diagram of a data driving circuit according to a preferred embodiment of the present invention;

FIG. 3 is an RC equivalent circuit of the source line pixel structure of the display panel according to the present invention;

FIG. 4 is a block diagram of a driving circuit of a display panel according to a first embodiment of the present invention;

FIG. 5 is a block diagram of a driving circuit of a display panel according to a second embodiment of the present invention;

FIG. 6 is a block diagram of a driving circuit of a display panel according to a third embodiment of the present invention;

FIG. 7 is a circuit diagram of a driving unit according to a first embodiment of the present invention;

FIG. 8 is a circuit diagram of a driving unit according to a second embodiment of the present invention;

FIG. 9 is a block diagram of a driving circuit of a display panel according to a fourth embodiment of the present invention;

FIG. 10 is a circuit diagram of a boosting unit according to a first embodiment of the present invention;

FIG. 11 is a block diagram of a driving circuit of a display panel according to a fifth embodiment of the present invention;

FIG. 12 is a circuit diagram of a boosting unit according to a second embodiment of the present invention;

FIG. 13 is a circuit diagram of a boosting unit according to a third embodiment of the present invention;

FIG. 14A is a schematic structural diagram of a display module;

FIG. 14B is a schematic structural diagram of a display module according to the present invention; and

fig. 15 is a flowchart of a method of manufacturing a display panel.

[ brief description of the drawings ]

1 display device

2 scan driving circuit

3 data driving circuit

32 gamma circuit

34 drive circuit

340 drive unit

3400, 3404 differential cell

34000, 34002, 34004, 34006 transistors

34020, 34040, 34041, 34043 transistors

34044, 34048, 34049, 34050 transistors

34051, 34052, 34052, 34053 transistors

34060, 34062, 3461, 3462, 3463 transistors

3464 transistor

34008, 34022, 34042, 34045 current sources

3402, 3406 output unit

342 digital-to-analog conversion circuit

344 boost circuit

346. 348 boost unit

3460 flying capacitor

C_s1、C_s2Storage capacitor

3470 control transistor

3472 diode

3474 storage inductor

3476 output capacitance

349 line buffer

4 sequential control circuit

5 display panel

50 pixel structure

500 resistance

502 capacitor

6 drive module

60 flexible circuit board

62 drive chip

V₁～V_rGamma voltage

V_T1、V_T2First timeA timing signal, a second timing signal

V_S1～V_SnScanning drive signal

V_s1～V_snData driving voltage

V_P1，V_P2A first supply voltage, a second supply voltage

V_P3Third supply voltage

V_ref1～V_refnReference driving voltage

Detailed Description

Certain terms are used throughout the description and following claims to refer to particular components. As one of ordinary skill in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. In addition, the term "coupled" is intended to encompass any direct or indirect electrical connection. Thus, if a first device couples to a second device, that connection may be through a direct electrical connection, or through an indirect electrical connection via other devices and connections.

In order to provide a further understanding and appreciation for the structural features and advantages achieved by the present invention, the following detailed description of the presently preferred embodiments is provided:

fig. 1 is a block diagram of a display device according to a preferred embodiment of the invention. As shown in the figure, the display device 1 of the present invention includes a scan driving circuit 2, a data driving circuit 3, a timing control circuit 4 and a display panel 5. The scan driving circuit 2 is used for generating a plurality of scan driving voltages V_g1～V_gmAnd sequentially transmitting the scan driving voltages V_g1～V_gmTo the display panel 5, the data driving circuit 3 is used for generating a plurality of data driving voltages V_s1～V_snAnd corresponding to the scan driving voltages V_g1～V_gmTransmitting the data driving voltages V_s1～V_snTo the display panel 5 to drive the display panel 5 to display images.

The timing control circuit 4 is used to generate a first timing signal V_T1And a second timing signal V_T2The timing control circuit 4 transmits the first timing signals V respectively_T1And a second timing signal V_T2To the scan driving circuit 2 and the data driving circuit 3 to control the scan driving voltage V transmitted from the scan driving circuit 2 to the display panel 5_g1～V_gmThe data driving voltage V transmitted to the display panel 5 synchronously with the data driving circuit 3_s1～V_snThat is, when the scan driving circuit 2 transmits the scan driving voltage V_g1When the display panel 5 is reached, the data driving circuit 3 corresponds to the scanning driving voltage V_g1Transmitting the data driving voltages V_s1～V_snDriving the display panel 5 to display the image of the first row; when the scan driving circuit 2 transmits the scan driving voltage V_g2When the display panel 5 is reached, the data driving circuit 3 corresponds to the scanning driving signal V_g2Transmitting the data driving voltages V_s1～V_snAnd driving the display panel 5 to display the second row of images on the display panel 5, and so on, and driving the display panel 5 to display a whole display frame.

Fig. 2 is a block diagram of a data driving circuit according to a preferred embodiment of the invention. As shown, the data driving circuit 3 includes a Gamma (Gamma) circuit 32 and a driving circuit 34. The gamma circuit 32 generates a plurality of gamma voltages according to a gamma curve, the gamma circuit 32 transmits the gamma voltages to the driving circuit 34, the gamma voltages are voltage signals with different levels, the driving circuit 34 receives the gamma voltages and a plurality of pixel data, the driving circuit 34 selects one of the gamma voltages according to the pixel data, and generates the data driving voltages V corresponding to the pixel data_s1～V_snAnd transmitting the data driving voltages V_s1～V_snTo the display panel 5 to drive the display panel 5 to display images.

Referring to fig. 3, an RC equivalent circuit of the source line pixel structure of the display panel of the invention is shown. As shown in the drawings, a preferred embodiment of the present invention is applied to a display panel 5 which is a thin film transistor liquid crystal display (TFT-LCD). The display panel 5 includes a plurality of pixel structures 50, the pixel structures 50 are coupled to the driving circuit 34, the pixel structure 50 of each source line in the display panel 5 is a Thin-film Transistor (TFT), and the pixel structure 50 can be equivalent to a resistor 500 connected in series to a capacitor 502.

Fig. 4 is a block diagram of a driving circuit of a display panel according to a first embodiment of the invention. As shown, the driving circuit 34 of the display panel of the present invention includes a plurality of driving units 340, a plurality of digital-to-analog conversion circuits 342, a boosting circuit 344 and at least one boosting unit 346. The driving units 340 are coupled to the gamma circuit 32, and the driving units 340 respectively depend on the gamma voltages V of the gamma circuit 32₁～V_rA reference driving voltage is generated, that is, a plurality of output lines of the gamma circuit 32 are respectively coupled to the driving units 340, and the gamma circuit 32 respectively transmits the gamma voltages V through the output lines₁～V_rTo the driving units 340, the driving units 340 are driven to generate a plurality of reference driving voltages V respectively_ref1～V_refrAnd transmitting the reference driving voltages V_ref1～V_refrTo the digital-to-analog conversion circuits 342.

The digital-to-analog conversion circuits 342 are coupled to the driving units 340 and receive the reference driving voltages V transmitted by the driving units 340_ref1～V_refrSelecting the reference driving voltages V according to the pixel data_ref1～V_refrOne of them is a data driving voltage V_sThe digital-to-analog conversion circuits 342 transmit the data driving voltages V_s1～V_snTo the display panel 5 to display a picture, that is, each numeralThe analog conversion circuits 342 receive the reference driving voltages V_ref1～V_refrAnd selecting the reference driving voltages V according to the pixel data_ref1～V_refrOne of them is a data driving voltage V_sTherefore, the digital-to-analog conversion circuits 342 generate the data driving voltages V_s1～V_snAnd transmitting the data driving voltages V_s1～V_snTo the display panel 5 to display a picture. The pixel data may be provided from a buffer 349 or, referring to fig. 2, from an input of a driver circuit 34.

The boost circuit 344 is coupled to the gamma circuit 32 and the digital-to-analog converters 342, and the boost circuit 344 is used for generating a first supply voltage V_P1And providing a first supply voltage V_P1To the gamma circuit 32 and the digital-to-analog conversion circuits 342. At least one boosting unit 346 coupled to the driving units 340 for generating a second supply voltage V_P2And providing a second supply voltage V_P2To the driving units 340. In the present embodiment, only one boosting unit 346 is used to generate the second supply voltage V_P2And providing a second supply voltage V_P2The boosting unit 346 coupled to the driving units 340 is coupled to the flying capacitor C_f1And C_f2And a storage capacitor C_s1The boost circuit 344 is coupled to the flying capacitor C_f3And C_f4And a storage capacitor C_s2. According to the above, the driving units 340 and the digital-to-analog conversion circuits 342 may have respective power supplies, and the gamma circuit 32 and the driving units 340 may have respective power supplies. Thus, the voltage boosting units 346 and the voltage boosting circuit 344 respectively provide voltages to the corresponding components to reduce the external storage capacitor C_s1And C_s2Area of, even without external storage capacitor C_s1And C_s2Thereby achieving the purpose of saving circuit area.

Furthermore, since the number of source lines of the display panel 5 is greater than the number of output lines of the gamma circuit 32, the driving units 340 are disposed between the gamma circuit 32 and the digital-to-analog conversion circuits 342, that is, the driving units 340 are disposed on the output lines of the gamma circuit 32, so that the number of driving units 340 can be reduced, and the circuit area can be reduced, thereby achieving the purpose of reducing the cost.

In addition, the driving circuit of the present invention further includes a line buffer 349. The line buffer 349 is used for temporarily storing the pixel data and transmitting the pixel data to the digital-to-analog conversion circuits 342.

Fig. 5 is a block diagram of a driving circuit of a display panel according to a second embodiment of the invention. As shown, the difference between the present embodiment and the embodiment of fig. 4 is that the present embodiment uses two

voltage boosting units

346, 348, and the

voltage boosting units

346, 348 respectively generate the second supply voltage V_P2And a third supply voltage V_P3The boost unit 346 delivers a second supply voltage V_P2To the first half 340 of the driving units 340, and the boost unit 348 transmits the third supply voltage VP3 to the second half 340 of the driving units 340. In addition, the boosting

units

346 and 348 do not necessarily need to allocate half of the driving units 340, but may allocate different ratios, for example, the boosting unit 346 is responsible for the first third of the driving units 340, the boosting unit 348 is responsible for the second two thirds of the driving units 340, or the boosting unit 346 is responsible for the first quarter of the driving units 340, and the boosting unit 348 is responsible for the second three quarters of the driving units 340.

In addition, the present invention is not limited to using one or two voltage boosting units, and the present invention can be applied to the driving units 340 from one voltage boosting unit to one driving unit 340.

Fig. 6 and fig. 7 are a block diagram of a driving circuit of a display panel according to a third embodiment of the invention and a circuit diagram of a driving unit according to a first embodiment of the invention. As shown, the present embodiment is different from the embodiment of fig. 4 in that the driving units 340 of the present embodiment simultaneously receive the first supply voltage V generated by the voltage boost circuit 344_P1And a second supply voltage V generated by the boost unit 346_P2As shown in fig. 7, the driving unit 340 of the present embodiment includes a differential unit 3400 and an output unit 3402. The differential unit 3400 receives a first supply voltage V_P1For serving as a power source of the differential unit 3400 and generating a differential voltage V according to the gamma voltage_dThe output unit 3402 receives a second supply voltage V_P2For serving as a power supply of the output unit 3402 and according to the differential voltage V_dGenerating a reference driving voltage V_ref。

As mentioned above, the differential cell 3400 of the present embodiment includes the transistor 34000, the transistor 34002, the transistor 34004, the transistor 34006, and the current source 34008. A gate terminal of the transistor 34000 is coupled to the output line of the gamma circuit 32 to receive the gamma voltage output by the gamma circuit 32, a first terminal of the transistor 34000 is coupled to a first terminal of the transistor 34002, a gate terminal of the transistor 34002 is coupled to the output terminal of the driving unit 340, a second terminal of the transistor 34002 is coupled to a first terminal of the transistor 34004, a second terminal of the transistor 34004 is coupled to the power source to receive the first supply voltage V provided by the voltage boost circuit 344_P1A gate terminal of the transistor 34004 is coupled to the gate terminal of the transistor 34006 and the first terminal of the transistor 34004, a first terminal of the transistor 34006 is coupled to a second terminal of the transistor 34000, a second terminal of the transistor 34006 is coupled to the power source terminal for receiving the first supply voltage V provided by the voltage boost circuit 344_P1A first terminal of the current source 34008 is coupled to the first terminal of the transistor 34000 and the first terminal of the transistor 34002, and a second terminal of the current source 34008 is coupled to the reference potential.

Furthermore, the output unit 3402 of the present embodiment includes a transistor 34020 and a current source 34022. A gate terminal of the transistor 34020 is coupled to the second terminal of the transistor 34000 and the first terminal of the transistor 34006, a first terminal of the transistor 34020 is coupled to the output terminal of the driving unit 340, a second terminal of the transistor 34020 is coupled to the power source terminal to receive the second supply voltage V output by the voltage boosting unit 346_P2A first terminal of the current source 34022 is coupled to the output terminal of the driving unit 340, and a second terminal of the current source 34022 is coupled to the reference potential. Thus, in the present embodiment, the differential unit 3400 and the output unit 3402 of the driving units 340 use boosting voltages respectivelyThe circuit 344 and the boosting unit 346 individually provide voltages to their corresponding components to improve the stability of the output voltage of the driving unit 340.

In addition, in addition to the differential unit 3400 and the output unit 3402 of the driving units 340 respectively using the respective supply voltages provided by the boosting circuit 344 and the boosting unit 346, the differential unit 3400 and the output unit 3402 of the driving units 340 of the invention can also simultaneously receive the second supply voltage V provided by the boosting unit 346_P2。

Fig. 8 is a circuit diagram of a driving unit according to a second embodiment of the invention. As shown, the driving unit 340 of the present embodiment is different from the embodiment of fig. 7 in that a differential unit 3404 of rail-to-rail is used in the driving unit 340 of the present embodiment, and therefore, the driving unit 340 of the present embodiment includes the differential unit 3404 and an output unit 3406. The differential cell 3404 includes transistors 34040-34053.

A gate terminal of the transistor 34040 is coupled to the output terminal of the gamma circuit 32, a first terminal of the transistor 34040 is coupled to a first terminal of the transistor 34041, a second terminal of the transistor 34040 is coupled between the transistor 34046 and the transistor 34048, a gate terminal of the transistor 34041 is coupled to the output terminal of the driving unit 340, a second terminal of the transistor 34041 is coupled between the transistors 34047 and 34049, a first terminal of the current source 34042 is coupled to the first terminal of the transistor 34040 and the first terminal of the transistor 34041, and a second terminal of the current source 34042 is coupled to the power source terminal for receiving the first supply voltage V provided by the voltage boost circuit 344_P1The gate of the transistor 34043 is coupled to the output terminal of the gamma circuit 32, a first terminal of the transistor 34043 is coupled to a first terminal of the transistor 34044, a second terminal of the transistor 34043 is coupled between the transistors 34050 and 34052, the gate of the transistor 34044 is coupled to the output terminal of the driving unit 340, a second terminal of the transistor 34044 is coupled between the transistors 34051 and 34053, a first terminal of the current source 34045 is coupled to the first terminal of the transistor 34043 and the first terminal of the transistor 34044, and a second terminal of the current source 34045 is coupled to the reference potential.

As mentioned above, the gate of the transistor 34046 of this embodiment is coupled to the gate of the transistor 34047, the transistor 34046 is coupled to the reference potential at a first terminal, and the transistor 34046 is coupled to a first terminal of the transistor 34048 at a second terminal. A first terminal of the transistor 34047 is coupled to the reference potential, and a second terminal of the transistor 34047 is coupled to the gate terminal of the transistor 34047 and a first terminal of the transistor 34049. The gate of transistor 34048 receives a first reference voltage V_b1A second terminal of the transistor 34048 is coupled to a first terminal of the transistor 34052. A gate terminal of the transistor 34049 receives a first reference voltage V_b1A second terminal of the transistor 34049 is coupled to a first terminal of the transistor 34053.

A gate terminal of the transistor 34050 is coupled to a gate terminal of the transistor 34051, a first terminal of the transistor 34050 is coupled to a second terminal of the transistor 34052, and a second terminal of the transistor 34050 is coupled to the power source terminal for receiving the first supply voltage V output by the voltage boost circuit 344_P1. A first terminal of the transistor 34051 is coupled to a second terminal of the transistor 34053 and the gate terminal of the transistor 34051, and a second terminal of the transistor 34051 is coupled to the power source terminal for receiving the first supply voltage V output by the voltage boost circuit 344_P1. The gates of the

transistors

34052 and 34053 receive a second reference voltage V_b2。

The output cell 3406 of the present embodiment includes

transistors

34060 and 34062. A gate terminal of the transistor 34060 is coupled to the first terminal of the transistor 34050, the second terminal of the transistor 34052 and the second terminal of the transistor 34043, a first terminal of the transistor 34060 is coupled to a first terminal of the transistor 34062 and the output terminal of the driving unit 340, a second terminal of the transistor 34060 is coupled to the power source terminal to receive the second supply voltage V output by the voltage boost unit 346_P2. A gate of the transistor 34062 is coupled to the second terminal of the transistor 34046, the first terminal of the transistor 34048 is coupled to the second terminal of the transistor 34040, and a second terminal of the transistor 34062 is coupled to the reference potential. Therefore, it is able to avoid affecting the power supply of the differential unit 3404 of the driving units 340 and further affecting the differential voltage V output by the differential unit 3404 when the output current varies greatly due to the load_dThe level of (1). Thus, the differential unit 3404 and the output unit 3406 of the present embodiment use the respective supplies provided by the boost circuit 344 and the boost unit 346Voltage to improve the stability of the output voltage of the driving unit 340.

Fig. 9 is a block diagram of a driving circuit of a display panel according to a fourth embodiment of the invention. As shown, the present embodiment is different from the embodiment of fig. 6 in that the positions of the driving units 340 and the digital-to-analog conversion circuits 342 of the present embodiment are reversed, that is, the output terminal of the gamma circuit 32 is coupled to the digital-to-analog conversion circuits 342, the output terminals of the digital-to-analog conversion circuits 342 are coupled to the driving units 340, respectively, that is, the digital-to-analog conversion circuits 342 receive the gamma voltages V of the gamma circuit 32₁～V_rAnd selecting the gamma voltages V according to the pixel data₁～V_rOne of them is a reference driving voltage V_refThe driving units 340 respectively receive the reference driving voltages V outputted by the digital-to-analog conversion circuits 342_ref1～V_refnAnd according to a reference driving voltage V_refGenerates a data driving voltage Vs, and transmits the data driving voltage Vs to the display panel 5 to display the image. The boosting circuit 344 and the boosting unit 346 are the same as those in the embodiment of fig. 6, and therefore, are not described herein again.

The driving units 340 of the present embodiment are also similar to the embodiment of fig. 6, and the driving units 340 simultaneously receive the first supply voltage V generated by the voltage boost circuit 344_P1And a second supply voltage V generated by the boost unit 346_P2In FIG. 7, the differential unit 3400 receives the first supply voltage V_P1As a power source of the differential unit 3400, and the output unit 3402 receives the second supply voltage V_P2Thus, the driving circuit of the display panel of the embodiment can also use the respective supply voltages provided by the voltage boost circuit 344 and the voltage boost unit 346 through the differential unit 3400 and the output unit 3402 of the driving unit 340 respectively to improve the stability of the output voltage of the driving unit 340.

Fig. 10 is a circuit diagram of a boosting unit according to a first embodiment of the invention. As shown, the boost unit 346 of the present embodiment may be a power supplyThe boost unit 346 of the capacitive boost circuit includes a fly capacitor 3460, transistors 3461-3464 and a storage capacitor C_s1. The fly capacitor 3460 is used for generating the second supply voltage V_P2One terminal of the transistor 3461 is coupled to one terminal of the fly capacitor 3460, and the other terminal of the transistor 3461 receives an input voltage V_INAnd controlled by a first control signal XA, the transistor 3462 is coupled to the fly capacitor 3460 and the transistor 3461 and controlled by a second control signal XB to output a second supply voltage V_P2One terminal of the transistor 3463 is coupled to the other terminal of the flying capacitor 3460, and the other terminal of the transistor 3463 receives the input voltage V_INAnd controlled by the second control signal XB, one end of the transistor 3464 is coupled to the fly capacitor 3460 and the transistor 3463, the other end of the transistor 3464 is coupled to a ground terminal and controlled by the first control signal XA and the storage capacitor C_s1Has one terminal coupled to the transistor 3462 and the storage capacitor C_s1The other end of the first and second voltage sources is coupled to a ground terminal to store and output a second supply voltage V_P2. Thus, the boost unit 346 of the present embodiment receives the input voltage V_INThen, the transistors 3461-3464 are controlled by the first control signal XA and the second control signal XB to generate the second supply voltage V_P2And outputs to the driving units 340.

Fig. 11 is a block diagram of a driving circuit of a display panel according to a fifth embodiment of the invention. As shown, the present embodiment is different from the above embodiments in that the boosting unit 346 of the present embodiment does not need to have the storage capacitor Cs1, that is, there is a connection path between the boosting unit 346 and the driving units 340, and the connection path is not connected to the storage capacitor Cs 1. Furthermore, the design of the boosting unit 346 in fig. 4 without the storage capacitor Cs1 can also be adopted, that is, the boosting unit 346 and the driving units 340 have a connection path therebetween, and the connection path is not connected to the storage capacitor Cs 1. In fig. 5, the design of the boosting

units

346 and 348 without the storage capacitors Cs1 and Cs3 may also be adopted, that is, a connection path is provided between the boosting unit 346 and the driving units 340, the storage capacitor Cs1 is not connected to the connection path, and a connection path is provided between the boosting unit 348 and the driving units 340, and the storage capacitor Cs3 is not connected to the connection path.

Referring to fig. 7 again, the driving unit 340 includes a driving unit 3400 and an output unit 3402. Accordingly, the boosting unit 346 shown in fig. 11 does not need to have the storage capacitor Cs1, and it can be designed to have a connection path between the boosting unit 346 and the output unit 3402, and the connection path does not have the storage capacitor Cs1 connected thereto. Furthermore, the design of the boosting unit 346 in fig. 6 without the storage capacitor Cs1 can also be adopted, that is, there is a connection path between the boosting unit 346 and the output unit 3402, and the connection path is not connected with the storage capacitor Cs 1.

In addition, referring to fig. 7 and 8, the driving unit 340 includes

differential units

3400, 3404 and

output units

3402, 3406. The boosting unit 346 is coupled to the

output units

3402, 3406 of the driving unit 340, so that a connection path is formed between the boosting unit 346 and the

output units

3402, 3406, and the storage capacitor Cs1 is not connected to the connection path. In addition to the above embodiments, the boosting unit 340 can also be coupled to the

differential units

3400, 3404 and the

output units

3402, 3406 of the driving unit 340, so that the boosting unit 346 and the

differential units

3400, 3404 have connection paths between the

output units

3402, 3406, respectively, and the connection paths are not connected with the storage capacitor Cs 1.

Fig. 12 is a circuit diagram of a boosting unit according to a second embodiment of the invention. As shown, the difference between the present embodiment and the embodiment of fig. 10 is that the boosting unit 346 of the present embodiment does not need to use the storage capacitor C_s1Since the boosting unit 346 of the present invention is used for providing the second supply voltage V of the driving units 340_P2The driving unit 340 only needs to drive the panel (e.g., the display panel 5 shown in fig. 4) without the function of the digital-to-analog converter circuit (e.g., the digital-to-analog converter circuit 342 shown in fig. 4) to maintain the accurate supply voltage, so that the power source can be allowed to oscillate greatly without the storage capacitor, and therefore, the boost unit 346 of the present embodiment only needs to use the fly capacitor 3460 to generate the second supply voltage V_P2Without the need of external storage capacitor C_s1I.e. byCan be used to supply the power required by the driving units 340, so as to reduce the circuit area and further achieve the purpose of reducing the cost.

Fig. 13 is a circuit diagram of a boosting unit according to a third embodiment of the invention. As shown, the boosting unit 346 of the present embodiment is different from the boosting unit 346 of the embodiments of fig. 10 and 12 in that the boosting unit 346 of the present embodiment is an inductive boosting unit, and the boosting unit 346 of the present embodiment includes a control transistor 3470, a diode 3472, a storage inductor 3474 and an output capacitor 3476. One terminal of the control transistor 3470 receives the input voltage V_INAnd is controlled by a control signal V_CA diode 3472 has one end coupled to the control transistor 3470, another end coupled to the ground terminal, and a storage inductor 3474 coupled to the control transistor 3470 and the diode 3472 for storing the input voltage V_INAnd one end of the output capacitor 3476 is coupled to the storage inductor 3474, and the other end of the output capacitor 3476 is coupled to the ground terminal to store the input voltage V_INAnd generates a second supply voltage V_P2And outputs to the driving units 340. In summary, the present invention is not limited to the boosting unit 346 being a capacitive boosting unit and an inductive boosting unit, as long as the boosting circuit 344 and the boosting unit 346 respectively generate the first supply voltage V_P1And a second supply voltage V_P2And respectively transmit the first supply voltage V_P1And a second supply voltage V_P2The digital-to-analog converter circuit 342 and the driving unit 340 are all within the scope of the present invention.

In addition, since the digital-to-analog conversion circuits 342 and the driving units 340 respectively use different supply voltages provided by the boost circuits 344 and the boost units 346, the output capacitor 3476 of the present embodiment does not need to use a large capacitor, and therefore, the output capacitor 3476 of the present embodiment can be built in a chip and does not need to be externally mounted outside the chip, thereby saving circuit area.

Please refer to fig. 14A, which is a schematic structural diagram of a display module. As shown, the display module includes a display panel 5 and a driving module 6. The driving module 6 is electrically connected to the display panel 5 to drive the display panel 5 to display an image. The driving module 6 includes a flexible circuit board 60 and a driving chip 62.

The driving chip 62 is disposed at one side of the display panel 5 and electrically connected to the display panel 5, one side of the flexible printed circuit 60 is connected to one side of the display panel 5 and electrically connected to the driving chip 62, and the storage capacitor Cs2 is externally attached to the flexible printed circuit 60 in this embodiment.

Based on the above, please refer to fig. 14B, which is a schematic structural diagram of the display module of the present invention. As shown, the driving chip 62 of the present embodiment is different from the embodiment of fig. 14A in that the driving chip includes the driving units 340, the digital-to-analog converters 342, a voltage boosting circuit 344, and a voltage boosting unit 346. The connection and operation relationships among the driving units 340, the digital-to-analog converters 342, the voltage boosting circuit 344 and the voltage boosting unit 346 have been described above, and will not be described herein again. Since the digital-to-analog conversion circuits 342 and the driving units 340 respectively use the respective supply voltages provided by the

boost circuits

344 and 346, the storage capacitor Cs2 required by the driving chip 62 can be greatly reduced and directly disposed in the driving chip 62, so that the external storage capacitor Cs2 is not required on the flexible circuit board 60, and even the driving chip 62 (including the driving circuit) does not need the external storage capacitor, thereby saving the circuit area and further saving the cost.

Fig. 15 is a flowchart of a manufacturing method of the display panel. As shown in the figure, the steps of the method for manufacturing a display panel according to the present invention first execute step S10 to provide the display panel 5, the flexible circuit board 60 and the driving chip 62, then execute step S12 to dispose the driving chip 62 on the display panel 5 (as shown in fig. 14A), and then execute step S14 to dispose the flexible circuit board 60 on the display panel 5 and electrically connect with the driving chip 62, wherein the flexible circuit board 60 does not need to be disposed with a storage capacitor Cs2 (as shown in fig. 14B).

Based on the above, since the digital-to-analog conversion circuits 342 and the driving units 340 respectively use the respective supply voltages provided by the

boost circuits

344 and 346, the storage capacitor Cs2 required by the driving chip 62 can be greatly reduced and directly disposed in the driving chip 62, so that the external storage capacitor Cs2 is not required on the flexible circuit board 60, and even the driving chip 62 (including the driving circuit) does not need an external storage capacitor, therefore, the present invention does not need a plurality of processes for externally attaching the storage capacitor to the flexible circuit board 60, thereby shortening the process time and further reducing the cost.

In addition, the method of manufacturing the display panel of the present invention further includes a step S16 of disposing a backlight module (not shown) below the display panel 5 to provide a light source to the display panel 5.

In summary, in the driving circuit of the display panel of the invention, the plurality of driving units respectively generate a reference driving voltage according to a gamma voltage of a gamma circuit, the plurality of digital-to-analog conversion circuits respectively receive the reference driving voltages output by the driving units and respectively select one of the reference driving voltages as a data driving voltage according to a pixel data, the digital-to-analog conversion circuits transmit the data driving voltages to the display panel to display a picture, the voltage boosting circuit is configured to generate a first supply voltage and provide the first supply voltage to the digital-to-analog conversion circuits, and the at least one voltage boosting unit is configured to generate a second supply voltage and provide the second supply voltage to the driving units. Therefore, the invention uses different supply voltages provided by the booster circuit and the booster unit respectively by the plurality of digital-analog conversion circuits and the plurality of driving units, so that the occupied area of the storage capacitor externally connected with the driving circuit is reduced, even the external storage capacitor is not needed, the circuit area is saved, and the purpose of saving the cost is further achieved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, which is defined by the appended claims.

Claims

1. A driving circuit of a display panel, comprising:

a gamma circuit for generating a plurality of gamma voltages;

a plurality of driving units for generating a plurality of reference driving voltages according to the gamma voltages;

a plurality of digital-to-analog conversion circuits, receiving the reference driving voltages output by the driving units, and respectively selecting one of the reference driving voltages as a data driving voltage according to a pixel data, the digital-to-analog conversion circuits transmitting the data driving voltages to the display panel;

a voltage boost circuit for generating a first supply voltage and providing the first supply voltage to the gamma circuit; and

and the boosting unit generates a second supply voltage and provides the second supply voltage to the driving units.

2. A driving circuit of a display panel, comprising:

a gamma circuit for generating a plurality of gamma voltages;

the plurality of boosting units generate a plurality of second supply voltages, and the boosting units provide the second supply voltages to the driving units.

3. The driving circuit according to claim 1 or 2, wherein each of the driving units comprises:

a differential unit for receiving the first supply voltage as a power supply of the differential unit and generating a differential voltage according to one of the gamma voltages; and

and the output unit receives the second supply voltage to be used as a power supply of the output unit and generates the reference driving voltage according to the differential voltage.

4. The driving circuit according to claim 1 or 2, wherein each of the driving units comprises:

a differential unit for receiving the second supply voltage as a power supply of the differential unit and generating a differential voltage according to one of the gamma voltages; and

5. A driving circuit according to claim 1 or 2, wherein a connection path is provided between the or each boosting unit and each driving unit, and a storage capacitor is connected to the connection path or is not connected to the connection path.

6. The driving circuit of claim 3, wherein the differential unit and the output unit are coupled to a reference voltage, and the gamma voltage and the reference voltage determine the reference driving voltage.

7. The driving circuit of claim 3, wherein the differential voltages respectively control the output units such that the boosting units respectively charge the output units.

8. The driving circuit of claim 4, wherein the differential unit and the output unit are coupled to a reference voltage, and the gamma voltage and the reference voltage determine the reference driving voltage.

9. The driving circuit of claim 4, wherein the differential voltages respectively control the output units such that the boosting units respectively charge the output units.

10. A driving module of a display panel, comprising:

a flexible circuit board electrically connected to the display panel; and

a driver chip adjacent to the flexible circuit board, the driver chip comprising:

a gamma circuit for generating a plurality of gamma voltages;

at least one boosting unit for generating a second supply voltage and providing the second supply voltage to the driving units;

a connection path is arranged between the boosting unit and each driving unit, and a storage capacitor is connected or not connected to the connection path.

11. A driving module of a display panel, comprising:

a flexible circuit board electrically connected to the display panel; and

a gamma circuit for generating a plurality of gamma voltages;

a plurality of boosting units for generating a plurality of second supply voltages, the boosting units providing the second supply voltages to the driving units;

a connection path is arranged between each boosting unit and each driving unit, and a storage capacitor is connected or not connected to the connection path.

12. A display device, comprising:

a display panel for displaying a picture;

a flexible circuit board electrically connected to the display panel; and

a driving chip, adjacent to the flexible circuit board, for driving the display panel to display the image, the driving chip comprising:

a gamma circuit for generating a plurality of gamma voltages;

13. A display device, comprising:

a display panel for displaying a picture;

a flexible circuit board electrically connected to the display panel; and

a gamma circuit for generating a plurality of gamma voltages;

14. A driving circuit of a display panel, comprising:

a gamma circuit for generating a plurality of gamma voltages;

a plurality of driving units for generating a plurality of data driving voltages according to the gamma voltages and transmitting the data driving voltages to the display panel to display a picture;

the boosting unit generates a second supply voltage and provides the second supply voltage to the driving units; wherein each of the driving units comprises:

a differential unit for receiving the first supply voltage as a power supply of the differential unit and generating a differential voltage; and

an output unit for receiving the second supply voltage as a power supply of the output unit and generating the data driving voltage according to the differential voltage;

15. A driving circuit of a display panel, comprising:

a gamma circuit for generating a plurality of gamma voltages;

wherein each of the driving units comprises:

16. The driving circuit of claim 14 or 15, comprising a plurality of digital-to-analog converters, each of the digital-to-analog converters receiving the gamma voltages generated by the gamma circuit and selecting one of the gamma voltages as a reference driving voltage according to a pixel data, the digital-to-analog converters transmitting the reference driving voltages to the driving units to generate the data driving voltages.

17. A driving module of a display panel, comprising:

a flexible circuit board electrically connected to the display panel; and

a gamma circuit for generating a plurality of gamma voltages;

a plurality of driving units for generating a plurality of data driving voltages according to the gamma voltages;

wherein each of the driving units comprises:

18. A driving module of a display panel, comprising:

a flexible circuit board electrically connected to the display panel; and

a gamma circuit for generating a plurality of gamma voltages;

wherein each of the driving units comprises:

19. A display device, comprising:

a display panel for displaying a picture;

a flexible circuit board electrically connected to the display panel; and

a driving chip adjacent to the flexible circuit board and generating a plurality of data driving voltages to the display panel to display the picture, the driving chip comprising:

a gamma circuit for generating a plurality of gamma voltages;

a plurality of driving units for generating the data driving voltages according to the gamma voltages;

wherein each of the driving units comprises:

20. A display device, comprising:

a display panel for displaying a picture;

a flexible circuit board electrically connected to the display panel; and

a gamma circuit for generating a plurality of gamma voltages;

wherein each of the driving units comprises:

21. A method of manufacturing a display device, comprising the steps of:

providing a display panel, a flexible circuit board and a driving chip;

arranging the driving chip on the display panel, wherein the driving chip comprises a boosting circuit, at least one boosting unit and a plurality of driving units; and

arranging the flexible circuit board on the display panel and electrically connecting with the driving chip;

the flexible circuit board is not required to be provided with a storage capacitor, a connecting path is arranged between the at least one boosting unit and the driving units, the connecting path is connected with the storage capacitor or not connected with the storage capacitor, the boosting circuit outputs a first supply voltage to a gamma circuit, the gamma circuit generates a plurality of gamma voltages, the at least one boosting unit outputs a second supply voltage to the driving units, and the driving units generate a plurality of data driving voltages to the display panel according to the gamma voltages so as to display a picture;

wherein each of the driving units comprises:

and the output unit receives the second supply voltage to be used as a power supply of the output unit and generates the data driving voltage according to the differential voltage.

22. The method of manufacturing of claim 21, comprising:

arranging a backlight module below the display panel to provide a light source to the display panel;

the driving chip comprises a plurality of digital-to-analog conversion circuits, and the digital-to-analog conversion circuits receive the first supply voltage.

23. A drive circuit of a display panel comprises a plurality of drive units, a plurality of digital-analog conversion circuits, a booster circuit and a booster unit; the voltage boosting circuit generates a first supply voltage and provides the first supply voltage to the digital-to-analog conversion circuits; the boosting unit generates a second supply voltage and provides the second supply voltage to the driving units; it is characterized in that:

the digital-analog conversion circuits generate a plurality of reference driving voltages according to a plurality of gamma voltages of a gamma circuit; and

the driving units receive the reference driving voltages output by the digital-to-analog conversion circuits, generate a plurality of data driving voltages according to the reference driving voltages, and transmit the data driving voltages to the display panel;

wherein each of the driving units comprises:

a differential unit, receiving the first supply voltage as a power supply of the differential unit, and generating a differential voltage according to the reference driving voltage; and

24. The driving circuit of claim 23, wherein the differential unit and the output unit are coupled to a reference potential, and the reference driving voltage and the reference potential determine the data driving voltage.

25. The driving circuit of claim 24, wherein a connection path is provided between the boosting unit and the driving units, the connection path is connected to a storage capacitor or not connected to the storage capacitor, and a connection path is provided between the boosting unit and the output unit, the connection path is connected to a storage capacitor or not connected to the storage capacitor.

26. The driving circuit of claim 23, wherein the differential voltage controls the output units such that the boosting unit charges each of the output units.

27. The driving circuit of claim 26, wherein a connection path is provided between the boosting unit and the driving units, the connection path is connected to a storage capacitor or not connected to the storage capacitor, and a connection path is provided between the boosting unit and the output unit, the connection path is connected to a storage capacitor or not connected to the storage capacitor.

28. The driving circuit of claim 23, wherein the boost units do not require a storage capacitor.

29. A drive circuit of a display panel comprises a plurality of drive units, a plurality of digital-analog conversion circuits, a booster circuit and a booster unit; the voltage boosting circuit generates a first supply voltage and provides the first supply voltage to the digital-to-analog conversion circuits; the boosting unit generates a second supply voltage, and provides the second supply voltage to the driving units; it is characterized in that:

the driving units generate a plurality of reference driving voltages according to a plurality of gamma voltages of a gamma circuit; and

the digital-to-analog conversion circuits receive the reference driving voltages output by the driving units, select one of the reference driving voltages as a data driving voltage according to pixel data, and transmit the data driving voltages to the display panel.

30. A drive module of a display panel comprises a flexible circuit board and a drive chip; the flexible circuit board is electrically connected with the display panel, the driving chip is electrically connected with the flexible circuit board, and the driving chip comprises a plurality of driving units, a plurality of digital-to-analog conversion circuits, a booster circuit and a booster unit; the voltage boosting circuit generates a first supply voltage and provides the first supply voltage to the digital-to-analog conversion circuits; the boosting unit generates a second supply voltage and provides the second supply voltage to the driving units; it is characterized in that:

the driving units receive the reference driving voltages output by the digital-to-analog conversion circuits, generate a plurality of data driving voltages according to the reference driving voltages, and transmit the data driving voltages to the display panel to display a picture;

wherein each of the driving units comprises:

a connection path is arranged between the boosting unit and the driving units, and a storage capacitor is connected or not connected on the connection path.

31. A drive module of a display panel comprises a flexible circuit board and a drive chip; the flexible circuit board is electrically connected with the display panel, the driving chip is electrically connected with the flexible circuit board, and the driving chip comprises a plurality of driving units, a plurality of digital-to-analog conversion circuits, a booster circuit and a booster unit; the voltage boosting circuit generates a first supply voltage and provides the first supply voltage to the digital-to-analog conversion circuits; the boosting unit generates a second supply voltage and provides the second supply voltage to the driving units; it is characterized in that:

the digital-to-analog conversion circuits receive the reference driving voltages output by the driving units, select one of the reference driving voltages according to pixel data to generate a data driving voltage, and transmit the data driving voltages to the display panel to display a picture.

32. A drive module of a display panel comprises a flexible circuit board and a drive chip; the flexible circuit board is electrically connected with the display panel, the driving chip is electrically connected with the flexible circuit board, and the driving chip comprises a plurality of driving units, a plurality of digital-to-analog conversion circuits, a boosting circuit and a plurality of boosting units; the voltage boosting circuit generates a first supply voltage and provides the first supply voltage to the digital-to-analog conversion circuits; the boosting units generate a plurality of second supply voltages and provide the second supply voltages to the driving units; it is characterized in that:

the digital-to-analog conversion circuits receive the reference driving voltages output by the driving units, select one of the reference driving voltages according to pixel data to generate a data driving voltage, and transmit the data driving voltages to the display panel to display a picture;

a connection path is arranged between the boosting units and the driving units, and a storage capacitor is connected or not connected on the connection path.

33. A display device comprises a display panel, a flexible circuit board and a driving chip; the display panel displays a picture, and the flexible circuit board is electrically connected with the display panel; the driving chip is electrically connected with the flexible circuit board and generates a plurality of data driving voltages to the display panel so as to display a picture; the driving chip comprises a plurality of driving units, a plurality of digital-analog conversion circuits, a boosting circuit and a boosting unit; the voltage boosting circuit generates a first supply voltage and provides the first supply voltage to the digital-to-analog conversion circuits; the boosting unit generates a second supply voltage and provides the second supply voltage to the driving units; it is characterized in that:

the driving units receive the reference driving voltages output by the digital-to-analog conversion circuits, generate the data driving voltages according to the reference driving voltages, and transmit the data driving voltages to the display panel;

wherein each of the driving units comprises:

34. A display device comprises a display panel, a flexible circuit board and a driving chip; the display panel displays a picture, and the flexible circuit board is electrically connected with the display panel; the driving chip is electrically connected with the flexible circuit board and generates a plurality of data driving voltages to the display panel so as to display a picture; the driving chip comprises a plurality of driving units, a plurality of digital-analog conversion circuits, a boosting circuit and a boosting unit; the voltage boosting circuit generates a first supply voltage and provides the first supply voltage to the digital-to-analog conversion circuits; the boosting unit generates a second supply voltage and provides the second supply voltage to the driving units; it is characterized in that:

the digital-to-analog conversion circuits receive the reference driving voltages output by the driving units, respectively select one of the reference driving voltages according to pixel data to generate the data driving voltage, and transmit the data driving voltage to the display panel.

35. A display device comprises a display panel, a flexible circuit board and a driving chip; the display panel displays a picture, and the flexible circuit board is electrically connected with the display panel; the driving chip is electrically connected with the flexible circuit board and generates a plurality of data driving voltages to the display panel so as to display a picture; the driving chip comprises a plurality of driving units, a plurality of digital-analog conversion circuits, a boosting circuit and a plurality of boosting units; the voltage boosting circuit generates a first supply voltage and provides the first supply voltage to the digital-to-analog conversion circuits; the boosting units generate a plurality of second supply voltages and provide the second supply voltages to the driving units; it is characterized in that:

the driving units generate a plurality of reference driving voltages according to a plurality of gamma voltages of a gamma circuit;

the digital-to-analog conversion circuits receive the reference driving voltages output by the driving units, respectively select one of the reference driving voltages according to pixel data to generate the data driving voltage, and transmit the data driving voltage to the display panel;