CN215220228U - Display device and common voltage compensation circuit - Google Patents
Display device and common voltage compensation circuit Download PDFInfo
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- CN215220228U CN215220228U CN202121479989.0U CN202121479989U CN215220228U CN 215220228 U CN215220228 U CN 215220228U CN 202121479989 U CN202121479989 U CN 202121479989U CN 215220228 U CN215220228 U CN 215220228U
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Abstract
The application discloses display device and public voltage compensating circuit, public voltage compensating circuit includes operational amplifier, basic resistance and resistance adjustment module, operational amplifier's forward input end is received power chip's mains voltage, operational amplifier's reverse input end is received the feedback voltage of public signal line in the display panel, operational amplifier compares power voltage and feedback voltage after, court display panel's public signal line output offset voltage, resistance adjustment module passes through feedback voltage automatically regulated resistance size. This application improves the compensating circuit of public voltage among the traditional display panel, replaces the feedback resistance of traditional operation amplification compensating circuit with resistance adjusting module, needs the resistance size through feedback voltage automatically regulated, realizes the accurate regulation and control based on public voltage's compensating voltage to obtain best display effect.
Description
Technical Field
The present application relates to the field of display, and in particular, to a display device and a common voltage compensation circuit.
Background
With the rapid development of display technology, the visual effect requirements of suppliers and consumers on display devices are gradually increased, and large-sized display devices are more and more favored by the market, but with the increase of display size, the stability of the common voltage signal at the input panel end is attenuated, and especially the most remote common voltage signal often has larger fluctuation, thereby affecting the display effect. The common voltage is generally compensated by adding a common voltage compensation circuit, specifically, the power supply voltage of the display panel is input to the forward input end of the operational amplifier, the common voltage fed back by the display panel is input to the reverse input end of the operational amplifier, and then the output end voltage is input to the display panel after the amplification processing by the operational amplifier, so that the fluctuation of the common voltage of the display panel is weakened, and the display quality of the liquid crystal display panel is improved.
In the conventional common voltage compensation circuit, the amplification factor k of the operational amplifier is-R1/R0, so that the amplification factor of the operational amplifier can be changed only by changing the multiple relation between R0 and R1, so that the display effect of the liquid crystal display panel is optimal. In the process of actual circuit design, a developer needs to adjust the amplification factor of the operational amplifier by manually replacing the resistance value of the R1, however, the method often needs to replace and adjust for many times to determine a proper amplification factor, which is very troublesome; moreover, when the panels are mass-produced, it is impossible to use the resistor R1 which is not used for different panels, so that the compensation effect has a large deviation.
SUMMERY OF THE UTILITY MODEL
The application aims to provide a display device and a public voltage compensation circuit which can automatically adjust the amplification factor of an operational amplifier and realize accurate compensation of public voltage.
The application discloses a display device, which comprises a display panel, a public voltage compensation circuit, a gamma circuit, a power chip and a source electrode driving chip, wherein one end of the gamma circuit is electrically connected with the power chip and used for receiving power voltage of the power chip, the other end of the gamma circuit is electrically connected with the source electrode driving chip and used for converting the power voltage into a public voltage signal to be output to the source electrode driving chip, and the source electrode driving chip is used for conveying the public voltage signal to a public signal wire of the display panel; the public voltage compensation circuit is respectively electrically connected with the power supply chip and the display panel, receives the power supply voltage of the power supply chip and the feedback voltage of a public signal wire in the display panel and provides compensation voltage for the public signal wire of the display panel;
the public voltage compensation circuit comprises an operational amplifier, a basic resistor and a resistance adjusting module, wherein the positive input end of the operational amplifier receives the power supply voltage of the power supply chip, the negative input end of the operational amplifier receives the feedback voltage of a public signal line in the display panel, and after the operational amplifier compares the power supply voltage with the feedback voltage, the output end of the operational amplifier outputs a compensation voltage to the public signal line of the display panel; one end of the basic resistor is electrically connected with the reverse input end of the operational amplifier, the other end of the basic resistor is electrically connected with the display panel, and the feedback voltage is transmitted to the reverse input end of the operational amplifier through the basic resistor; the input end of the resistance adjusting module is connected between the inverting input end of the operational amplifier and the basic resistor, and the output end of the resistance adjusting module is electrically connected with the output end of the operational amplifier; the resistance adjusting module automatically adjusts the resistance value through the feedback voltage.
Optionally, the resistance adjusting module is disposed in the gamma circuit.
Optionally, the gamma circuit is a programmable gamma correction buffer circuit.
Optionally, the resistance adjusting module includes an integrated circuit intermediate bus, a digital-to-analog converter, a buffer and a voltage dependent resistor, where the integrated circuit intermediate bus receives a digital working voltage in the gamma circuit, adjusts a resistance value, and performs digital adjustment through a register in the gamma circuit to form a corresponding digital voltage; the digital-to-analog converter is electrically connected with a register in the gamma circuit, receives the digital voltage and converts the digital voltage into analog voltage; the buffer is electrically connected with the digital-to-analog converter and receives the analog voltage to form a buffer voltage; the piezoresistor is electrically connected with the buffer, receives the buffer voltage and forms a corresponding resistance value according to the voltage difference of the buffer voltage; one end of the piezoresistor is connected between the inverting input end of the operational amplifier and the basic resistor, and the other end of the piezoresistor is electrically connected with the output end of the operational amplifier.
Optionally, the gamma circuit includes a first pin, a second pin, and a plurality of third pins arranged in parallel, one end of the voltage dependent resistor is connected between the inverting input terminal of the operational amplifier and the base resistor through the first pin, and the other end of the voltage dependent resistor is connected to the output terminal of the operational amplifier through the second pin; the third pin is electrically connected with the source electrode driving chip.
Optionally, the adjustment precision of the intermediate bus of the integrated circuit is set to [0: 7 ] 8 bit.
Optionally, the resistance adjusting module includes two digital-to-analog converters and two buffers, one end of each digital-to-analog converter is electrically connected to a register in the gamma circuit, the other end of each digital-to-analog converter is electrically connected to one buffer, and two ends of the voltage dependent resistor are electrically connected to the two buffers respectively; the resistance adjusting module further comprises a resistance limiting module, wherein two ends of the resistance limiting module are respectively electrically connected with the two digital-to-analog converters, and the maximum value and the minimum value of the piezoresistor are limited.
Optionally, the common voltage compensation circuit further includes a feedback signal line and an output signal line, one end of the feedback signal line is electrically connected to one end of the common signal line far from the source driver chip, and the other end of the feedback signal line is electrically connected to the base resistor; one end of the output signal line is electrically connected with one end of the common signal line far away from the source electrode driving chip, and the other end of the output signal line is electrically connected with the output end of the operational amplifier.
Optionally, the feedback signal lines at least include two lines respectively located in the non-display areas on both sides of the display panel, and the output signal lines also at least include two lines respectively located in the non-display areas on both sides of the display panel.
The application also discloses a common voltage compensation circuit in the display device, which comprises an operational amplifier, a basic resistor and a resistance adjusting module, wherein the forward input end of the operational amplifier receives the power supply voltage of the power supply chip, the reverse input end of the operational amplifier receives the feedback voltage of the common signal line in the display panel, and after the operational amplifier compares the power supply voltage with the feedback voltage, the output end of the operational amplifier outputs the compensation voltage to the common signal line of the display panel; one end of the basic resistor is electrically connected with the reverse input end of the operational amplifier, the other end of the basic resistor is electrically connected with the display panel, and the feedback voltage is transmitted to the reverse input end of the operational amplifier through the basic resistor; the input end of the resistance adjusting module is connected between the inverting input end of the operational amplifier and the basic resistor, and the output end of the resistance adjusting module is electrically connected with the output end of the operational amplifier; the resistance adjusting module is arranged in the gamma circuit and automatically adjusts the resistance value through the feedback voltage.
This application improves the compensating circuit of common voltage among traditional display panel, replace traditional operational amplification compensating circuit's feedback resistance with resistance adjusting module, need the resistance size through feedback voltage automatically regulated, the magnification is confirmed through the ratio of resistance adjusting module and basic resistance to operational amplifier, make the automatic compensating voltage who corresponds according to display panel's feedback voltage generation of common voltage compensating circuit, realize the accurate regulation and control of compensating voltage based on common voltage, thereby obtain best display effect.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a schematic diagram of a common voltage compensation circuit model;
fig. 2 is a schematic diagram of a display device according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a voltage compensation circuit according to an embodiment of the present application;
FIG. 4 is a diagram illustrating a combination of a display panel, a source driver chip and a common voltage compensation circuit according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram of a specific structure of a common voltage compensation circuit according to an embodiment of the present disclosure.
100, a display device; 200. a display panel; 210. a display area; 220. a non-display area; 240. a feedback signal line; 250. an output signal line; 260. a common signal line; 300. a common voltage compensation circuit; 310. an operational amplifier; 320. a base resistance; 330. a resistance adjustment module; 331. an integrated circuit intermediate bus; 332. a digital-to-analog converter; 333. a buffer; 334. a voltage dependent resistor; 335. a resistance value limiting module; 336. a register; 340. a compensation resistor; 400. a gamma circuit; 410. a first pin; 420. a second pin; 430. a third pin; 440. simulating a power supply; 450. a digital circuit power supply; 460. a data line; 470. a control line; 480. reading a signal line; 490. a ground line; 500. a power supply chip; 600. a source driver chip; 700. a chip on film; 800. and a voltage amplifier.
Detailed Description
It is to be understood that the terminology, the specific structural and functional details disclosed herein are for the purpose of describing particular embodiments only, and are representative, but that the present application may be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.
In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating relative importance or as implicitly indicating the number of technical features indicated. Thus, unless otherwise specified, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "plurality" means two or more. The terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that one or more other features, integers, steps, operations, elements, components, and/or combinations thereof may be present or added.
Further, terms of orientation or positional relationship indicated by "center", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, are described based on the orientation or relative positional relationship shown in the drawings, are simply for convenience of description of the present application, and do not indicate that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.
Furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, fixed connections, removable connections, and integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
The present application will now be described in detail with reference to the drawings and alternative embodiments, it being understood that any combination of the various embodiments or technical features described below may form new embodiments without conflict.
FIG. 1 is a schematic diagram of a VCOM compensation circuit model, in which a power supply Voltage (VCOM) is input to the positive input terminal ("+" terminal in FIG. 1) of an operational amplifier 310 through a common signal line 260; the common voltage (VCOM-FB) fed back from the liquid crystal display panel is input to the inverting input terminal (the "-" terminal in FIG. 1) of the operational amplifier 310 through the feedback signal line 240; then, the voltage (VCOM-OUT) at the output end is amplified by the operational amplifier 310 and then input to the display panel through the output signal line 250, so that the fluctuation of VCOM voltage of the liquid crystal display panel is weakened, and the display quality of the liquid crystal display panel is improved. As can be seen from fig. 1, the amplification factor k of the operational amplifier 310 is (VCOM-OUT-VCOM)/(VCOM-FB-VCOM) is-R1/R0.
In fact, due to the differences in the size, type and driving structure of the display panel, the required magnification is different. Generally, the operational amplification factor of the operational amplifier (OP) depends on the ratio-R1/R0 of the compensation resistor 340(R1) and the base resistor 320(R0), so that the operational amplifier factor can only be adjusted by changing the multiple relationship between R1 and R0 to determine the compensation factor that can optimize the display effect. In the process of actual circuit design, a developer adjusts the amplification factor of the OP by manually replacing the resistance value of R1, however, this method often requires multiple replacement adjustments to determine a proper amplification factor, which is very troublesome, and is limited by the fact that the resistance value specification of the resistor cannot obtain the optimal amplification factor, and the method cannot realize that each panel uses a different feedback resistor R1 in mass production. Based on this, the application provides a display device and public voltage compensation circuit that can automatically regulated operational amplifier magnification, realize accurate compensation public voltage.
As shown in fig. 2, which is a schematic diagram of a display device provided in an embodiment of the present application, the display device 100 in this embodiment includes a display panel 200, a common voltage compensation circuit 300, a gamma circuit 400, a power chip 500, and a source driver chip 600, wherein one end of the gamma circuit 400 is electrically connected to the power chip 500 and receives a power Voltage (VCOM) of the power chip 500, the other end of the gamma circuit 400 is electrically connected to the source driver chip 600 and converts the power Voltage (VCOM) into a common voltage signal to be output to the source driver chip 600, and the source driver chip 600 transmits the common voltage signal to a common signal line of the display panel 200; the common voltage compensation circuit 300 is electrically connected to the power chip 500 and the display panel 200, respectively, and simultaneously receives a power supply Voltage (VCOM) of the power chip 500 and a feedback voltage (VCOM-FB) of a common signal line in the display panel 200, and provides a compensation voltage (VCOM-OUT) to the common signal line of the display panel 200;
as shown in fig. 3, the common voltage compensation circuit 300 includes an operational amplifier (OP)310, a base resistor (R0)320, and a resistance adjustment module 330, wherein a forward input terminal (+) of the operational amplifier 310 receives a supply Voltage (VCOM) of the power chip 500 through a common signal line 260, a reverse input terminal (-) of the operational amplifier 310 receives a feedback voltage (VCOM-FB) of a common signal line of the display panel 200 through a feedback signal line 240, the operational amplifier 310 compares the supply Voltage (VCOM) and the feedback voltage (VCOM-FB), and an output terminal of the operational amplifier 310 outputs a compensation voltage (VCOM-OUT) toward the common signal line of the display panel 200 through an output signal line 250; one end of the base resistor (R0)320 is electrically (-) connected to the inverting input terminal of the operational amplifier 310, and the other end is electrically connected to the display panel 200, and the feedback voltage is transmitted to the inverting input terminal of the operational amplifier 310 via the base resistor 320; the input terminal of the resistance adjusting module 330 is connected between the inverting input terminal (-) of the operational amplifier 310 and the base resistance (R0)320, and the output terminal of the resistance adjusting module 330 is electrically connected to the output terminal of the operational amplifier 310; the resistance adjusting module 330 automatically adjusts the resistance value according to the feedback voltage.
This application improves the compensating circuit of common voltage in traditional display panel, replace traditional operational amplification compensating circuit's feedback resistance R1 with resistance adjusting module 330, need the resistance size through feedback voltage automatically regulated, the magnification is confirmed through the ratio of resistance adjusting module 330 and basic resistance R0 to operational amplifier 310, make common voltage compensating circuit 300 automatic generate corresponding compensating voltage according to display panel 200's feedback voltage, realize the accurate regulation and control of common voltage's compensating voltage, thereby obtain best display effect.
Fig. 2 and 4 are schematic diagrams showing a combination of the display panel 200, the source driver chips and the common voltage compensation circuit 300, in which one end of each source driver Chip is electrically connected to the gamma circuit 400 through a Chip On Film (COF) 700 to receive a common voltage signal, and the other end is electrically connected to a common signal line of the display region 210 in the display panel 200; the common voltage compensation circuit 300 includes a feedback signal line 240 and an output signal line 250 disposed in the non-display region 220, wherein one end of the feedback signal line 240 is electrically connected to one end of the common signal line away from the source driver chip, and the other end is electrically connected to a base resistor (R0)320 for providing a feedback voltage to a negative input terminal (VCOM-FB) of the operational amplifier 310; one end of the output signal line 250 is electrically connected to one end of the common signal line, which is far from the source driver chip, and the other end is electrically connected to an output terminal (VCOM-OUT) of the operational amplifier 310, and receives the compensation voltage of the common voltage compensation circuit 300.
Because the common signal line is communicated with the source driving chip and extends towards the direction far away from the source driving chip, the internal impedance of the panel is large, so that the stability of the common voltage signal at the end of the input panel is attenuated, and particularly, the display effect is influenced by the large fluctuation of the public voltage at the farthest end, so that the public voltage at the far end is compensated, and the display effect of the display panel 200 is more uniform.
Moreover, the feedback signal lines 240 include at least two lines respectively located in the non-display regions 220 on both sides of the display region 210 in the display panel 200, and the output signal lines 250 also include at least two lines respectively located in the non-display regions 220 on both sides of the display panel 200. Therefore, the voltage conditions of the plurality of common signal lines can be fed back simultaneously, voltage compensation is carried out on the end parts of the common signal lines far away from the source driving chip from two directions, the compensation efficiency is improved, and the display effect of the panel is improved.
In addition, a metal wire can be used to connect the end parts of all the common signal wires far away from the source driver chip, and then the feedback signal wire 240 and the output signal wire 250 are connected to the metal wire, so that the compensation of all the common signal wires is completed, and the compensation efficiency is improved.
As shown in fig. 5, the resistance adjusting module 330 is disposed in the gamma circuit 400, so that the resistance adjusting module 330 is disposed in the gamma circuit 400 without affecting the function of the original gamma circuit 400, which not only saves the floor space of the resistance adjusting module 330 in the driving circuit of the display panel 200, but also completes the manufacture of the resistance adjusting module 330 while manufacturing the gamma circuit 400, thereby saving the cost of the common voltage compensation circuit 300.
The resistance adjustment module 330 may further be implemented in a programmable Gamma correction buffer (P-Gamma). Compared with the mode that the gamma circuit 400 is a resistor string, the programmable gamma correction buffer circuit replaces the mode of utilizing the resistor string, the gamma voltage is accurately adjusted through program control, the innovation of a panel driving framework is greatly influenced, the programmable gamma correction buffer circuit improves the gamma correction accuracy, and the product development time is saved.
Specifically, in fig. 5, the analog power supply (AVDD)440 is a driving voltage source for chip operation, and the voltage amplifier 800 amplifies the voltage provided by the AVDD and outputs the amplified voltage to the register 336; one end of the gamma circuit 400 receives a driving power supplied from an analog power supply (AVDD)440, and the other end is connected to a ground line 490. A digital circuit power supply (DVDD)450 provides a digital operating voltage for the integrated circuit interposer bus 331; the data line 460(SDA), control line 470(SCL), and read signal line 480(nWR) are connected to the integrated circuit intermediate bus 331(12C RX, 12C bus) to provide signals to the integrated circuit intermediate bus 331; by receiving the digital operating voltage and a plurality of signals, the integrated circuit interposer bus 331 performs resistance adjustment and digital adjustment through the register 336 (register) in the gamma circuit 400 to form a corresponding digital voltage.
The resistance adjusting module 330 includes an integrated circuit intermediate bus 331(12C RX), a Digital-to-analog converter 332 (DAC), a buffer 333, and a voltage dependent resistor 334(Rv), where the integrated circuit intermediate bus 331 receives the Digital operating voltage in the gamma circuit 400, performs resistance adjustment, and performs Digital adjustment through a register 336 (register) in the gamma circuit 400 to form a corresponding Digital voltage; the digital-to-analog converter 332 is electrically connected to the register 336 in the gamma circuit 400, receives the digital voltage, and converts the digital voltage into an analog voltage; the buffer 333 is electrically connected to the digital-to-analog converter 332, and receives the analog voltage to form a buffer voltage; the voltage dependent resistor 334 is electrically connected to the buffer 333, receives the buffer voltage, and forms a corresponding resistance value according to a voltage difference of the buffer voltage; the varistor 334 has one end connected between the inverting input terminal of the operational amplifier 310 and the base resistor 320, and the other end electrically connected to the output terminal of the operational amplifier 310.
In this embodiment, the resistance adjusting module 330 forms a corresponding resistance value in real time according to the feedback voltage of the display panel 200; compared with a specific resistor, the mode that the integrated circuit intermediate bus 331, the digital-to-analog converter 332, the buffer 333 and the piezoresistor 334 are combined to form an adjustable resistor is adopted, the adjustment of the compensation multiple is easy to realize, and a corresponding resistance value can be generated in real time according to the feedback voltage, so that the effect of accurate regulation and control is achieved, and the signal fluctuation in the common signal line is smaller. The resistance adjustment value is determined according to the display effect of the display panel 200, the resistance value of the resistor is controlled through the intermediary bus 331 of the integrated circuit, and the best resistance value is judged according to the image quality.
The gamma circuit 400 comprises a first pin 410(Rx), a second pin 420(Ry) and a plurality of third pins 430(GM1, gm2..) arranged in parallel, wherein one end of the piezoresistor 334 is connected between the inverting input terminal of the operational amplifier 310 and the base resistor 320 through the first pin 410, and the other end of the piezoresistor 334 is connected to the output terminal of the operational amplifier 310 through the second pin 420; the third pin 430 is electrically connected to the source driver chip 600. In this embodiment, only the NC pins that are not used by the gamma circuit 400 are used, and the first pin 410 and the second pin 420 are added to be used as outputs at two ends of the resistance adjusting module 330, so as to improve the utilization rate of the gamma circuit 400 and not to affect the function of the gamma circuit 400 itself.
In addition, the adjustment precision of the integrated circuit intermediate bus 331 is set to [0: 7 ] 8bit, so that the integrated circuit intermediate bus 331 can generate [0:255] 256 binary gears, and the resistance of the resistance adjusting module 330 can be adjusted by 256 gears, thereby realizing the precise adjustment of the resistance of the compensation resistor.
Further, the resistance adjusting module 330 includes two digital-to-analog converters 332 and two buffers 333, one end of each digital-to-analog converter 332 is electrically connected to the register 336 in the gamma circuit 400, the other end of each digital-to-analog converter is electrically connected to one buffer 333, and two ends of the voltage dependent resistor 334 are electrically connected to the two buffers 333, respectively; the resistance adjusting module 330 further includes a resistance value limiting module 335, where two ends of the resistance value limiting module 335 are electrically connected to the two digital-to-analog converters 332, respectively, and limit the maximum value and the minimum value of the voltage dependent resistor 334.
On the basis that the compensation resistor has 256 adjustable gears, the smaller the upper and lower limit range of the compensation resistor is, the higher the adjustment precision of the compensation resistor can be, thereby further improving the adjustment precision of the compensation resistor. Specifically, the multiple range needing compensation is determined according to the screen display state, the initial values of the upper limit and the lower limit of the resistance value are determined, and then 256 adjustable gears are formed in the range of the upper limit and the lower limit.
As another embodiment of the present application, the present application further discloses a common voltage compensation circuit in the above display device, which includes an operational amplifier, a base resistor, and a resistance adjustment module, wherein a forward input end of the operational amplifier receives a power supply voltage of the power supply chip, a reverse input end of the operational amplifier receives a feedback voltage of a common signal line in the display panel, and an output end of the operational amplifier outputs a compensation voltage to the common signal line of the display panel after the operational amplifier compares the power supply voltage with the feedback voltage; one end of the basic resistor is electrically connected with the reverse input end of the operational amplifier, the other end of the basic resistor is electrically connected with the display panel, and the feedback voltage is transmitted to the reverse input end of the operational amplifier through the basic resistor; the input end of the resistance adjusting module is connected between the inverting input end of the operational amplifier and the basic resistor, and the output end of the resistance adjusting module is electrically connected with the output end of the operational amplifier; the resistance adjusting module is arranged in the gamma circuit and automatically adjusts the resistance value through the feedback voltage.
The common voltage compensation circuit provided by the embodiment can automatically generate a corresponding compensation voltage according to the feedback voltage of the display panel, so that accurate regulation and control of VCOM compensation voltage are realized, and an optimal display effect is obtained; and the resistance adjusting module in the common voltage compensation circuit is also arranged in the gamma circuit, so that the utilization rate of the gamma circuit in the original driving circuit of the display panel is improved, and the occupied area of the common voltage compensation circuit in the driving circuit is reduced.
It should be noted that the inventive concept of the present application can form many embodiments, but the present application has a limited space and cannot be listed one by one, so that, on the premise of no conflict, any combination between the above-described embodiments or technical features can form a new embodiment, and after the embodiments or technical features are combined, the original technical effect will be enhanced.
The foregoing is a more detailed description of the present application in connection with specific alternative embodiments, and the specific implementations of the present application are not to be considered limited to these descriptions. For those skilled in the art to which the present application pertains, several simple deductions or substitutions may be made without departing from the concept of the present application, and all should be considered as belonging to the protection scope of the present application.
Claims (10)
1. A display device comprises a display panel, a common voltage compensation circuit, a gamma circuit, a power supply chip and a source electrode driving chip, wherein one end of the gamma circuit is electrically connected with the power supply chip and used for receiving power supply voltage of the power supply chip, the other end of the gamma circuit is electrically connected with the source electrode driving chip and used for converting the power supply voltage into a common voltage signal and outputting the common voltage signal to the source electrode driving chip, and the source electrode driving chip is used for transmitting the common voltage signal to a common signal wire of the display panel; the public voltage compensation circuit is respectively electrically connected with the power supply chip and the display panel, receives the power supply voltage of the power supply chip and the feedback voltage of a public signal wire in the display panel and provides compensation voltage for the public signal wire of the display panel; wherein the common voltage compensation circuit comprises:
the operational amplifier is used for comparing the power supply voltage with the feedback voltage, and the output end of the operational amplifier outputs a compensation voltage to the common signal line of the display panel;
a basic resistor, one end of which is electrically connected with the inverting input terminal of the operational amplifier and the other end of which is electrically connected with the display panel, and the feedback voltage is transmitted to the inverting input terminal of the operational amplifier via the basic resistor; and
the input end of the resistance adjusting module is connected between the inverting input end of the operational amplifier and the basic resistor, and the output end of the resistance adjusting module is electrically connected with the output end of the operational amplifier;
the resistance adjusting module automatically adjusts the resistance value through the feedback voltage.
2. The display device of claim 1, wherein the resistance adjustment module is disposed in a gamma circuit.
3. The display device of claim 2, wherein the gamma circuit is a programmable gamma correction buffer circuit.
4. The display device of claim 3, wherein the resistance adjustment module comprises:
the integrated circuit intermediate bus receives the digital working voltage in the gamma circuit, adjusts the resistance value, and performs digital adjustment through a register in the gamma circuit to form corresponding digital voltage;
the digital-to-analog converter is electrically connected with a register in the gamma circuit, receives the digital voltage and converts the digital voltage into analog voltage;
the buffer is electrically connected with the digital-to-analog converter and used for receiving the analog voltage to form a buffer voltage; and
the piezoresistor is electrically connected with the buffer, receives the buffer voltage and forms a corresponding resistance value according to the voltage difference of the buffer voltage; one end of the piezoresistor is connected between the inverting input end of the operational amplifier and the basic resistor, and the other end of the piezoresistor is electrically connected with the output end of the operational amplifier.
5. The display device according to claim 4, wherein the gamma circuit includes a first pin, a second pin and a plurality of third pins arranged in parallel, one end of the varistor is connected between the inverting input terminal of the operational amplifier and the base resistor through the first pin, and the other end is connected to the output terminal of the operational amplifier through the second pin; the third pin is electrically connected with the source electrode driving chip.
6. The display apparatus of claim 4, wherein the adjustment precision of the integrated circuit interposer bus is set to [0: 7 ] 8 bits for 256 bits.
7. The display device according to claim 6, wherein the resistance adjustment module comprises two digital-to-analog converters and two buffers, one end of each digital-to-analog converter is electrically connected to a register in the gamma circuit, the other end of each digital-to-analog converter is electrically connected to one buffer, and the two ends of the piezoresistor are electrically connected to the two buffers;
the resistance adjusting module further comprises a resistance limiting module, wherein two ends of the resistance limiting module are respectively electrically connected with the two digital-to-analog converters, and the maximum value and the minimum value of the piezoresistor are limited.
8. The display device according to claim 1, wherein the common voltage compensation circuit further includes a feedback signal line and an output signal line, one end of the feedback signal line being electrically connected to one end of the common signal line remote from the source driver chip, and the other end being electrically connected to a base resistor; one end of the output signal line is electrically connected with one end of the common signal line far away from the source electrode driving chip, and the other end of the output signal line is electrically connected with the output end of the operational amplifier.
9. The display device according to claim 8, wherein the feedback signal lines include at least two lines respectively located in the non-display regions on both sides of the display panel, and the output signal lines include at least two lines respectively located in the non-display regions on both sides of the display panel.
10. A common voltage compensation circuit in a display device as claimed in any one of claims 1 to 9, comprising:
the operational amplifier is used for comparing the power supply voltage with the feedback voltage, and then the output end of the operational amplifier outputs a compensation voltage to the common signal line of the display panel;
a basic resistor, one end of which is electrically connected with the inverting input terminal of the operational amplifier and the other end of which is electrically connected with the display panel, and the feedback voltage is transmitted to the inverting input terminal of the operational amplifier via the basic resistor; and
the input end of the resistance adjusting module is connected between the inverting input end of the operational amplifier and the basic resistor, and the output end of the resistance adjusting module is electrically connected with the output end of the operational amplifier;
the resistance adjusting module is arranged in the gamma circuit and automatically adjusts the resistance value through the feedback voltage.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115035869A (en) * | 2022-06-21 | 2022-09-09 | 福州京东方光电科技有限公司 | Common voltage compensation circuit, compensation method and display device |
| CN116312406A (en) * | 2023-01-31 | 2023-06-23 | 惠科股份有限公司 | Common voltage compensation circuit and display device |
| CN116994536A (en) * | 2023-08-31 | 2023-11-03 | 惠科股份有限公司 | Common voltage compensation circuit, compensation method and display device |
-
2021
- 2021-06-30 CN CN202121479989.0U patent/CN215220228U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115035869A (en) * | 2022-06-21 | 2022-09-09 | 福州京东方光电科技有限公司 | Common voltage compensation circuit, compensation method and display device |
| CN116312406A (en) * | 2023-01-31 | 2023-06-23 | 惠科股份有限公司 | Common voltage compensation circuit and display device |
| CN116994536A (en) * | 2023-08-31 | 2023-11-03 | 惠科股份有限公司 | Common voltage compensation circuit, compensation method and display device |
| CN116994536B (en) * | 2023-08-31 | 2023-12-01 | 惠科股份有限公司 | Common voltage compensation circuit, compensation method and display device |
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