CN109817178B - Gamma circuit, driving circuit and display device - Google Patents
Gamma circuit, driving circuit and display device Download PDFInfo
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- CN109817178B CN109817178B CN201910219880.4A CN201910219880A CN109817178B CN 109817178 B CN109817178 B CN 109817178B CN 201910219880 A CN201910219880 A CN 201910219880A CN 109817178 B CN109817178 B CN 109817178B
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Abstract
The application discloses a gamma circuit, a driving circuit and a display device, wherein the gamma circuit comprises an internal reference voltage module and a digital-to-analog module, and the internal reference voltage module comprises a first reference voltage unit and a second reference voltage unit; the digital-to-analog module is coupled with the internal reference voltage module, the digital-to-analog module comprises at least two digital-to-analog units for outputting at least two different gamma voltages, and each digital-to-analog unit is respectively connected with the first reference voltage unit and/or the second reference voltage unit; the voltage value output by the first reference voltage unit is different from the voltage value output by the second reference voltage unit. The gamma circuit selects different reference voltages when the gamma voltage is output according to different output values of the gamma voltage of the gamma circuit, so that more accurate partial pressure is achieved, the precision of the gamma circuit is improved, and more suitable and accurate gamma voltage is output.
Description
Technical Field
The application relates to the technical field of display, in particular to a gamma circuit, a driving circuit and a display device.
Background
A TFT-LCD (Thin Film Transistor Liquid Crystal Display) is one of the major types of flat panel displays, and has become an important Display platform in modern IT and video products. The TFT-LCD Panel is formed by connecting a PCB (printed circuit board), a Source Driver IC (data Driver IC) and an LCD optical membrane through a Bonding technology to form a TFT-LCD display system; the internal DAC (Digital-to-Analog Converter) of the traditional P-Gam IC (programmable gamma chip) is respectively connected with VREF (P-Gam IC internal reference voltage) and VSS (grounded 0V); the output voltage of the gamma chip is mainly divided with reference to the internal reference voltage of the gamma chip.
The internal reference voltage output value is fixed, only one voltage value is used as a reference, when the gamma circuit divides the voltage, the voltage value generated by the voltage division is in a fixed range, the error value between the actual voltage possibly required and the voltage after the voltage division is larger, and if the error value is not in a controllable range, the display disorder can be caused.
Disclosure of Invention
The application aims to provide a gamma circuit, a driving circuit and a display device which can improve the gamma voltage adjustment precision.
The application discloses a gamma circuit, which comprises an internal reference voltage module and a digital-to-analog module, wherein the internal reference voltage module comprises a first reference voltage unit and a second reference voltage unit; the digital-to-analog module is coupled with the internal reference voltage module, the digital-to-analog module comprises at least two digital-to-analog units for outputting at least two different gamma voltages, and each digital-to-analog unit is respectively connected with the first reference voltage unit and/or the second reference voltage unit; wherein the voltage value output by the first reference voltage unit is different from the voltage value output by the second reference voltage unit.
Optionally, the gamma circuit includes a temporary memory, a fixed memory, and a bidirectional serial bus connected to the fixed memory and the temporary memory; the digital-to-analog conversion module further comprises at least two buffers, the output end of the temporary storage is connected to the digital-to-analog conversion unit, and each digital-to-analog conversion unit is correspondingly connected with each buffer.
Optionally, the voltage value output by the first reference voltage unit is a first reference voltage; the voltage value output by the second reference voltage unit is a second reference voltage, and the first reference voltage is greater than the second reference voltage; the digital-to-analog conversion module comprises a first digital-to-analog conversion unit and a second digital-to-analog conversion unit, and the gamma voltage output by the first digital-to-analog conversion unit is greater than the gamma voltage output by the second digital-to-analog conversion unit; the first reference voltage is greater than the second reference voltage.
Optionally, there are N first digital-to-analog units, and there are M second digital-to-analog units; the gamma voltage output by the first digital-to-analog conversion unit is greater than or equal to the second reference voltage and smaller than the first reference voltage; the gamma voltage output by the second digital-to-analog voltage is less than or equal to the second reference voltage; the positive polarity end of each first digital-to-analog conversion unit is connected with the first reference voltage unit, and the negative polarity end of each first digital-to-analog conversion unit is connected with the second reference voltage unit; the positive polarity end of each second digital-to-analog unit is connected with the first reference voltage unit, and the negative polarity end of each second digital-to-analog unit is grounded; or the positive polarity end of each first digital-to-analog conversion unit is connected with the first reference voltage unit, and the negative polarity end of each first digital-to-analog conversion unit is grounded; the positive polarity end of each second digital-to-analog unit is connected with the second reference voltage unit, and the negative polarity end of each second digital-to-analog unit is grounded; m, N is a positive integer of 1 or more.
Optionally, there are N first digital-to-analog units, and there are M second digital-to-analog units; the gamma voltage output by the first digital-to-analog conversion unit is greater than or equal to a second reference voltage and is less than the first reference voltage; the gamma voltage output by the second digital-to-analog voltage is less than or equal to the second reference voltage; the positive polarity end of each first digital-to-analog conversion unit is connected with the first reference voltage unit, and the negative polarity end of each first digital-to-analog conversion unit is connected with the second reference voltage unit; the positive polarity end of each second digital-to-analog unit is connected with the second reference voltage unit, and the negative polarity end of each second digital-to-analog unit is grounded; m, N is a positive integer of 1 or more.
Optionally, the first reference voltage is twice the second reference voltage, and the gamma voltage output by the first digital-to-analog conversion unit is less than or equal to the first reference voltage and greater than the second reference voltage; the gamma voltage output by the second digital-to-analog conversion unit is less than or equal to the second reference voltage.
Optionally, M and N satisfy the following formula: m + N is 14.
Optionally, the gamma circuit includes a temporary storage, and the temporary storage outputs 10bit data to the digital-to-analog conversion module to complete digital-to-analog conversion; the precision calculation of the gamma voltage output by the first digital-to-analog conversion unit satisfies the following formula:
LSB1＝(V_REF-V_HREF)/(2^10-1)＝V_HREF/(2^10-1)、Gam＝V_REF/1023*n+V_HVEF；
the precision calculation of the gamma voltage output by the second digital-to-analog conversion unit satisfies the following formula:
LSB2＝V_HREF/(2^10-1)、Gam＝V_HREF/1023*n；
wherein, LSB is the minimum resolution voltage, V _ REF is the first reference voltage, V _ HREF is the second reference voltage, Gam is the output gamma voltage value, and n is a positive integer within 0-1023.
The application also discloses a driving circuit, which comprises the gamma circuit, and the driving circuit further comprises a data driving circuit, wherein the gamma circuit outputs gamma voltage to the data driving circuit.
The application also discloses a display device, which comprises the drive circuit and a display panel driven by the drive circuit.
For only one reference voltage unit of inside reference voltage module, only provide a reference voltage's scheme, the inside reference voltage module of this application includes two different reference voltage units, in order to provide the different reference voltage of two voltage value, thus, gamma circuit is different according to the output value of gamma voltage of itself, select more suitable reference voltage unit when carrying out gamma voltage output, obtain different reference voltage through being connected to different reference voltage units, in order to reach more accurate partial pressure, be favorable to improving display panel's application scope, and simultaneously, be favorable to improving gamma circuit's precision, output in order to obtain more suitable accurate gamma voltage.
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 display device according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a driving circuit according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a gamma circuit according to an embodiment of the present application;
FIG. 4 is a schematic diagram of another gamma circuit according to another embodiment of the present application;
FIG. 5 is a schematic diagram of a gamma circuit according to another embodiment of the present application.
100, a display device; 200. a display panel; 300. a drive circuit; 310. a gamma circuit; 320. an internal reference voltage module; 321. a first reference voltage unit; 322. a second reference voltage unit; 330. a digital-to-analog module; 331. a first digital-to-analog unit; 332. a second digital-to-analog unit; 333. a buffer; 340. a temporary storage; 350. a bidirectional serial bus; 360. a fixed memory; 370. and a data driving circuit.
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 application is further described with reference to the drawings and alternative embodiments.
As shown in fig. 1, the present application discloses a display device 100, the display device 100 includes a display panel 200 and a driving circuit 300, the driving circuit 300 drives the display panel 200; further, referring to fig. 2, the driving circuit 300 includes a gamma circuit 310 and a data driving circuit 370, and the gamma circuit 310 outputs a gamma voltage to the data driving circuit 370.
As can be known from fig. 3, the gamma circuit 310 includes an internal reference voltage module 320 and a digital-to-analog module 330, the internal reference voltage module 320 includes a first reference voltage unit 321 and a second reference voltage unit 322, the digital-to-analog module 330 is coupled to the internal reference voltage module 320, the digital-to-analog module 330 includes at least two digital-to-analog units to output at least two different gamma voltages, each of the digital-to-analog units is respectively connected to the first reference voltage unit 321 and/or the second reference voltage unit 322; (taking two digital-to-analog modules as an example, the first reference voltage unit 321 may be connected to only one of the digital-to-analog modules, or may be connected to both of the digital-to-analog modules at the same time).
The gamma circuit 310 further includes a temporary memory 340, a fixed memory 360, and a bidirectional serial bus 350 connected to the fixed memory 360 and the temporary memory 340; the bidirectional serial total number coupling register 340 may directly output the data signal to the register 340, or the data signal may be input into the fixed memory 360 first, and then the fixed memory 360 transmits the data signal to the register 340, the fixed memory 360 may not lose the stored data even after the current is turned off, and the gamma circuit 310 includes a programmable gamma chip, and the gamma chip mainly performs the voltage division operation.
In addition, the digital-to-analog module 330 further includes at least two buffers 333, the output ends of the temporary storage 340 are connected to the digital-to-analog module 330, the number of the output ends of the temporary storage 340 is equal to the number of the input ends of the digital-to-analog units, the output ends of the temporary storage are connected to the input ends of the digital-to-analog units in a one-to-one correspondence manner, and in addition, one buffer 333 is connected behind each digital-to-analog unit.
In this embodiment, different reference voltages may be mainly selected for voltage division, and the voltage value output by the first reference voltage unit 321 is different from the voltage value output by the second reference voltage unit 322. In actual work, the register 340 stores the related data signal outputted to the digital-to-analog module 330, when the digital-to-analog module 330 divides the voltage to form the gamma voltage, different reference voltages can be selected according to different output values of the gamma voltage to achieve more accurate division, so as to improve the precision of the gamma circuit 310, so as to obtain more appropriate and accurate gamma voltage for outputting, and a buffer 333 is generally arranged during outputting, so that the pushing capability of the gamma voltage output is mainly increased, and a large amount of power consumption loss is avoided.
We set the voltage value output by the first reference voltage unit 321 as a first reference voltage (V _ REF); the voltage value output by the second reference voltage unit 322 is a second reference voltage (H _ REF), and the first reference voltage is greater than the second reference voltage; the second reference voltage is divided into two conditions, the maximum value of the gamma voltage is smaller than the second reference voltage, the second reference voltage is selected at the moment, normal gamma voltage output can be met, and if the first reference voltage is selected, the adjustment precision cannot meet the requirements of people.
However, as the scientific and technical development progresses, the display panel 200 may have two different display modes, in the first display mode, the maximum value of the gamma voltage is less than the second reference voltage;
in the second display mode, the maximum value of the gamma voltage is greater than the second reference voltage and less than the first reference voltage, so that different reference voltages can be selected according to different display modes.
In addition, when the maximum value of the gamma voltage is less than or equal to the first reference voltage and greater than the second reference voltage, the following improvement is included. Assuming that there are N first digital-to-analog units 331 and M second digital-to-analog units 332; the gamma voltage output by the first digital-to-analog unit 331 is less than the first reference voltage and greater than the second reference voltage; the gamma voltage output by the second digital-to-analog converting unit 332 is less than the second reference voltage.
Referring to fig. 3 and 4, a positive polarity terminal of each of the first digital-to-analog conversion units 331 is connected to the first reference voltage unit 321, and a negative polarity terminal of each of the first digital-to-analog conversion units 331 is connected to the second reference voltage unit 322; the positive terminal of each of the second digital-to-analog conversion units 332 is connected to the first reference voltage unit 321, and the negative terminal of each of the second digital-to-analog conversion units 332 is grounded;
or a positive terminal of each of the first digital-to-analog units 331 is connected to the first reference voltage unit 321, and a negative terminal of each of the first digital-to-analog units 331 is grounded;
the positive terminal of each of the second digital-to-analog conversion units 332 is connected to the second reference voltage unit 322, and the negative terminal of each of the second digital-to-analog conversion units 332 is grounded;
m, N is a positive integer greater than or equal to 1.
In this embodiment, two different references are connected and output corresponding to different dac cells, and different gamma voltage outputs can select division voltages according to different reference voltages, taking the same gray scale as an example, assuming gray scales of 0-255 and 256 division voltages, if voltages of 10V and 5V are taken as examples, the voltage of each of 10V division is 10/256 and the voltage of each of 5V division is 5/256, so that the division accuracy is high for the gamma circuit 310.
As shown in fig. 5, in an embodiment, the first reference voltage is twice the second reference voltage, N first digital-to-analog units 331 are provided, each first digital-to-analog unit includes a digital-to-analog converter (DAC), M second digital-to-analog units 332 include M, each second digital-to-analog unit includes a digital-to-analog converter (DAC), and in the case of M ═ N ═ 7, we generally select the optimal scheme as: the positive terminal of each of the first digital-to-analog conversion units 331 is connected to the first reference voltage unit 321, the negative terminal of each of the first digital-to-analog conversion units 331 is connected to the second reference voltage unit 322, V _ REF is a first reference voltage, V _ HREF is a second reference voltage, and V _ REF is 2V _ HREF.
The positive terminal of each of the second digital-to-analog conversion units 332 is connected to the second reference voltage unit 322, and the negative terminal of each of the second digital-to-analog conversion units 332 is grounded; the gamma circuit 310 includes a temporary storage 340, and the temporary storage 340 outputs 10bit data to the digital-to-analog module 330 to complete digital-to-analog conversion;
taking Gam1-Gam7 as an example, the precision calculation of the gamma voltage output by the first digital-to-analog conversion unit satisfies the following formula:
LSB1＝(V_REF-V_HREF)/(2^10-1)＝V_HREF/(2^10-1)
Gam＝V_REF/1023*n+V_HVEF；
taking Gam8-Gam14 as an example, the precision calculation of the gamma voltage output by the second digital-to-analog conversion unit satisfies the following formula:
LSB2＝V_HREF/(2^10-1)、Gam＝V_HREF/1023*n；
wherein, LSB is the minimum resolution voltage, V _ REF is the first reference voltage, V _ HREF is the second reference voltage, Gam is the output gamma voltage value, and n is a positive integer within 0-1023.
The LSB voltage is reduced from LSB V _ REF/(2^10-1) to LSB V _ HREF/(2^10-1), and since the HREF voltage is reduced to half of VREF, that is, the adjustment precision of the Gam voltage output by the gamma circuit 310 is improved by half, the performance thereof is greatly improved.
The technical solution of the present application can be widely applied to various display panels, such as a Twisted Nematic (TN) display panel, an In-Plane Switching (IPS) display panel, a Vertical Alignment (VA) display panel, and a Multi-Domain Vertical Alignment (MVA) display panel, and of course, other types of display panels, such as an Organic Light-Emitting Diode (OLED) display panel, can also be applied to the above solution.
The foregoing is a more detailed description of the present application in connection with specific alternative embodiments, and the present application is not intended to be limited to the specific embodiments shown. 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 (8)
1. A gamma circuit, comprising:
an internal reference voltage module including a first reference voltage unit and a second reference voltage unit;
a digital-to-analog module coupled to the internal reference voltage module, wherein the digital-to-analog module includes at least two digital-to-analog units for outputting at least two different gamma voltages, and each digital-to-analog unit is connected to the first reference voltage unit and/or the second reference voltage unit, respectively;
wherein the voltage value output by the first reference voltage unit is different from the voltage value output by the second reference voltage unit;
the voltage value output by the first reference voltage unit is a first reference voltage; the voltage value output by the second reference voltage unit is a second reference voltage;
the digital-to-analog conversion module comprises a first digital-to-analog conversion unit and a second digital-to-analog conversion unit, and the gamma voltage output by the first digital-to-analog conversion unit is greater than the gamma voltage output by the second digital-to-analog conversion unit;
the first reference voltage is greater than the second reference voltage;
n first digital-to-analog units are provided, and M second digital-to-analog units are provided;
the gamma voltage output by the first digital-to-analog conversion unit is greater than or equal to the second reference voltage and smaller than the first reference voltage; the gamma voltage output by the second digital-to-analog voltage is less than or equal to the second reference voltage;
the positive polarity end of each first digital-to-analog conversion unit is connected with the first reference voltage unit, and the negative polarity end of each first digital-to-analog conversion unit is connected with the second reference voltage unit;
the positive polarity end of each second digital-to-analog unit is connected with the first reference voltage unit, and the negative polarity end of each second digital-to-analog unit is grounded;
or the positive polarity end of each first digital-to-analog conversion unit is connected with the first reference voltage unit, and the negative polarity end of each first digital-to-analog conversion unit is grounded;
the positive polarity end of each second digital-to-analog unit is connected with the second reference voltage unit, and the negative polarity end of each second digital-to-analog unit is grounded;
m, N is a positive integer of 1 or more.
2. The gamma circuit of claim 1, wherein the gamma circuit comprises a register and a fixed memory, and a bi-directional serial bus connected to the fixed memory and the register;
the digital-to-analog conversion module further comprises at least two buffers, the output end of the temporary storage is connected with the digital-to-analog conversion unit, and the output end of each digital-to-analog conversion unit is correspondingly connected with the input end of each buffer.
3. A gamma circuit, comprising:
an internal reference voltage module including a first reference voltage unit and a second reference voltage unit;
a digital-to-analog module coupled to the internal reference voltage module, wherein the digital-to-analog module includes at least two digital-to-analog units for outputting at least two different gamma voltages, and each digital-to-analog unit is connected to the first reference voltage unit and/or the second reference voltage unit, respectively;
wherein the voltage value output by the first reference voltage unit is different from the voltage value output by the second reference voltage unit;
the voltage value output by the first reference voltage unit is a first reference voltage; the voltage value output by the second reference voltage unit is a second reference voltage;
the digital-to-analog conversion module comprises a first digital-to-analog conversion unit and a second digital-to-analog conversion unit, and the gamma voltage output by the first digital-to-analog conversion unit is greater than the gamma voltage output by the second digital-to-analog conversion unit;
the first reference voltage is greater than the second reference voltage;
n first digital-to-analog units are provided, and M second digital-to-analog units are provided;
the gamma voltage output by the first digital-to-analog conversion unit is greater than or equal to a second reference voltage and is less than the first reference voltage; the gamma voltage output by the second digital-to-analog voltage is less than or equal to the second reference voltage;
the positive polarity end of each first digital-to-analog conversion unit is connected with the first reference voltage unit, and the negative polarity end of each first digital-to-analog conversion unit is connected with the second reference voltage unit;
the positive polarity end of each second digital-to-analog unit is connected with the second reference voltage unit, and the negative polarity end of each second digital-to-analog unit is grounded;
m, N is a positive integer of 1 or more.
4. The gamma circuit of claim 1, wherein said first reference voltage is twice said second reference voltage;
the gamma voltage output by the first digital-to-analog conversion unit is less than or equal to the first reference voltage and greater than the second reference voltage;
the gamma voltage output by the second digital-to-analog conversion unit is less than or equal to the second reference voltage.
5. A gamma circuit as claimed in any one of claims 1 to 4, wherein M and N satisfy the following equation:
M+N＝14。
6. the gamma circuit of claim 3, wherein the gamma circuit comprises a register, the register outputs 10 bits of data to the DAC module to perform DAC;
the precision calculation of the gamma voltage output by the first digital-to-analog unit satisfies the following formula:
LSB＝(V_REF-V_HREF)/(2^10-1)＝V_HREF/(2^10-1)、Gam＝V_REF/1023*n+V_HVEF；
the precision calculation of the gamma voltage output by the second digital-to-analog unit satisfies the following formula:
LSB＝V_HREF/(2^10-1)、Gam＝V_HREF/1023*n；
wherein, LSB is the minimum resolution voltage, V _ REF is the first reference voltage, V _ HREF is the second reference voltage, Gam is the output gamma voltage value, and n is a positive integer within 0-1023.
7. A driving circuit comprising the gamma circuit according to any one of claims 1 to 6, the driving circuit further comprising a data driving circuit, the gamma circuit outputting a gamma voltage to the data driving circuit.
8. A display device comprising the driver circuit as claimed in claim 7, and a display panel driven by the driver circuit.
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