CN104978936A - Gamma reference voltage generation circuit of display apparatus and gamma voltage generation circuit of display apparatus - Google Patents
Gamma reference voltage generation circuit of display apparatus and gamma voltage generation circuit of display apparatus Download PDFInfo
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- CN104978936A CN104978936A CN201410133701.2A CN201410133701A CN104978936A CN 104978936 A CN104978936 A CN 104978936A CN 201410133701 A CN201410133701 A CN 201410133701A CN 104978936 A CN104978936 A CN 104978936A
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Abstract
A gamma voltage generation circuit of a display apparatus comprises a positive resistor string and a negative resistor string. The positive resistor string comprises resistors of the first type and resistors of the second type, the resistors of the first type are connected in series, a first end of the resistors of the second type is serially connected with one of the resistors of the first type, a voltage of the first end of the resistors of the second type is smaller than a half of a gamma reference voltage. The negative resistor string comprises resistor of the third type and resistors of the fourth type, a first end of the resistor of the third type receives the gamma reference voltage, the resistors of the fourth type are connected in series, and a first end of a first resistor of the fourth type is connected in series with a second send of the resistors of the third type. A voltage of the second end of the resistors of the third type is larger than the half of the gamma reference voltage.
Description
Technical field
The present invention relates to a kind of display device, and in particular to a kind of gamma voltage producing circuit of display device.
Background technology
Along with popularizing of portable electronic product, display screen is also more and more important.In various display technique, liquid crystal display (Liquid Crystal Display; LCD) there is the advantage of low power consumption and high display quality, be particularly suitable for the display screen as portable electronic product.General can carry out gamma correction (Gamma Correction) to image brilliance before show image, such as, by the gamma correction circuit that liquid crystal display is built-in, gamma correction be carried out to signal of video signal, make image brilliance can be consistent with human brain vision.
Gamma correction circuit generally comprises the resistance string joined by multiple resistance string (Resistor string), each ohmically voltage with reference to voltage (Gamma reference voltage), and is output into gamma voltage (Gamma voltage) by the resistance of being connected by these.Generally speaking, the polarity putting on the voltage on liquid crystal can be reversed with a predetermined space, effectively to drive liquid crystal molecule to change arrangement mode, and then changes penetration and brightness.
In traditional liquid crystal display data drive circuit (Source Driver), usually all complete voltage range can be contained, also maximum voltage value (0 to VREF) can be changed to by minimum amount of voltage that with regard to voltage, so large change in voltage amplitude causes the area of digital analog converter (DAC) to increase, and the resistance string area produced required for gamma voltage also significantly increases; In addition, usually need two groups of working storages to store gamma voltage relevant information in traditional liquid crystal display data drive circuit, the suitable footprint area of these working storages, not only adds manufacturing cost, also makes liquid crystal display be difficult to further compactization.
Summary of the invention
Therefore, an aspect of of the present present invention is the gamma voltage producing circuit providing a kind of display device, can reduce the resistance number produced required for gamma voltage, and then reduces the area of display device drive circuit.
According to one embodiment of the invention, the gamma voltage producing circuit of display device contains positive polarity resistance string and negative polarity resistance string.Positive polarity resistance serial connection receives gamma reference voltage (Gamma ReferenceVoltage) to provide the multiple positive polarity gamma voltages needed at least one positive polarity passage (Positive Channel), this positive polarity resistance string is containing multiple first kind resistance and at least one Equations of The Second Kind resistance, first kind resistance is electrically serially connected, the first end of Equations of The Second Kind resistance be electrically connected in series first kind resistance one of them, wherein, voltage on the first end of Equations of The Second Kind resistance, is less than the half of gamma reference voltage.Negative polarity resistance serial connection receives gamma reference voltage to provide the multiple negative polarity gamma voltages needed at least one negative polarity passage (Negative Channel), this negative polarity resistance string contains at least one 3rd quasi-resistance and multiple 4th quasi-resistance, and the first end of the 3rd quasi-resistance receives gamma reference voltage; 4th quasi-resistance is electrically serially connected, and the second end of first end serial connection the 3rd quasi-resistance of first the 4th quasi-resistance, and the voltage on the second end of the 3rd quasi-resistance, be greater than the half of gamma reference voltage.
Another aspect of the present invention is the gamma reference voltage generation circuit providing a kind of display device, can reduce to produce the working storage area required for gamma reference voltage, omit external pin (PIN) further simultaneously, and then reduce the entire area of display device drive circuit.
According to another embodiment of the present invention, the gamma reference voltage generation circuit of display device contains nonvolatile memory (Non-Volatile Memory), working storage, and controller.Nonvolatile memory contains the first data base (Bank) and the second data base, to store first group of gamma reference voltage value and second group of gamma reference voltage value respectively; Working storage electrical connection nonvolatile memory; Controller electrical connection nonvolatile memory and working storage, the data base handover information that this controller transmits according to bus interface, determines the digital gamma voltage value the first data base or the second data base stored, copies to working storage.
The gamma voltage producing circuit of above embodiment and gamma reference voltage generation circuit, resistance string is divided into positive and negative polarity by the polarity according to passage, do not need to carry out dividing potential drop to the reference voltage of full width, the scope of carrying out dividing potential drop is needed to be only the half of original reference voltage many, resistance number can be reduced in a large number, therefore can reduce circuit area.
On the other hand, utilize bus interface to replace external pin to transmit the handover information of data base, and only need one group of working storage to store gamma voltage value, further reduce integrated circuit area.
Accompanying drawing explanation
Fig. 1 illustrates the voltage division schematic diagram of the positive and negative polarity passage of the embodiment of the present invention.
Fig. 2 illustrates the gamma voltage producing circuit schematic diagram of embodiment of the present invention display device.
Fig. 3 illustrates the gamma reference voltage generation circuit schematic diagram of embodiment of the present invention display device.
Embodiment
In this article, use the vocabulary of first, second and the 3rd etc., for describing various element, assembly etc.But these elements, assembly not should limit by these terms.Therefore, the first element, assembly etc. hereinafter also can be called as the second element, assembly etc., and do not depart from original idea of the present invention.When element is called as " electrical connection " to another element, it can, for being connected directly to another element, have again or wherein an additional element to exist.Relative, when element is called as " being directly electrically connected " to another element, wherein there is no additional element.
Unless otherwise defined, all vocabulary used herein (comprising technology and scientific terminology) has its common meaning, and its meaning can be readily appreciated by one skilled in the art.Further, the definition of above-mentioned vocabulary in generally conventional dictionary, should be read as the consistent meaning in field related to the present invention in the content of this instructions.Unless there are especially clearly defining, these vocabulary will not be interpreted as Utopian or too formal meaning.The one or more synonym of use repeated, can't get rid of and use other synonyms.
The gamma voltage producing circuit of following examples, polarity according to passage will divide resistance string, correspond in the resistance string of positive polarity passage, originally the resistance number being used for producing negative polarity gal code voltage can be reduced in a large number, correspond in the resistance string of negative polarity passage, originally the resistance number being used for producing positive polarity gal code voltage can be reduced in a large number, therefore can reduce circuit area.
On the other hand, then utilize bus interface to replace external pin to transmit the handover information of data base, and only need one group of working storage to store gamma voltage value, further reduce circuit area and wafer package volume.
Fig. 1 illustrates the voltage division schematic diagram of the positive and negative polarity passage of the embodiment of the present invention.In traditional gamma voltage producing circuit, for the passage (Channel) of each 10 (Bit), gamma voltage all needs to contain complete reference voltage range, namely resistance string (Gamma String) needs to provide the dividing potential drop being changed to ground voltage GND from gamma reference voltage VREF, so many resistance can be needed to carry out dividing potential drop, cause the area of resistance string and digital analog converter (DAC) to increase.
In fact, can not use ground voltage GND in the middle of positive polarity passage, be furthermore the voltage that can not use 0V to 1/2VREF, and the gamma voltage within the scope of these can be omitted.If consider the certain applications in system, positive polarity passage only needs to contain the voltage range from gamma reference voltage VREF to A point (being less than the half of gamma reference voltage VREF), A point does not then need to consider to meeting piezoelectric voltage GND, and therefore resistance number is by 2
10be reduced to 2
9, the digital analog converter (DAC) of 10 also can be reduced to 9, a large amount of circuit area reducing resistance string and digital analog converter.
Similar, in the middle of negative polarity passage, can not use gamma reference voltage VREF, or even can not use the gamma voltage of VREF to 1/2VREF, the gamma voltage in these scopes can be omitted.If consider the certain applications in system, negative polarity passage only needs to contain the scope of B point (being greater than the half of gamma reference voltage VREF) to ground voltage GND, therefore only needs to use 2
9individual resistance, the digital analog converter of 10 also can be reduced to 9, a large amount of circuit area saving resistance string and digital analog converter.
Fig. 2 illustrates the gamma voltage producing circuit schematic diagram of embodiment of the present invention display device.The gamma voltage producing circuit 200 of display device is mainly containing positive polarity resistance string 213 and negative polarity resistance string 211, and positive polarity resistance string 213 and negative polarity resistance string 211 couples of gamma reference voltage VREF carry out dividing potential drop to produce multiple gamma voltage.Positive polarity resistance string 213 dividing potential drop gamma reference voltage VREF, to provide the multiple positive polarity gamma voltage V needed for positive polarity passage 217
r1Pv
rn-1P, V
rnP; Negative polarity resistance string 211 also can provide multiple negative polarity gamma voltage V needed for negative polarity passage 219 by dividing potential drop gamma reference voltage VREF
r1N, V
r2Nv
rnNthese positive and negative polarity gamma voltages are transferred into multiple digital analog converter 215, and then be delivered to positive polarity passage 217 and negative polarity passage 219 respectively, wherein, a digital analog converter 215 corresponds to an an operational amplifier 217a or operational amplifier 219a, and positive polarity passage 217 and negative polarity passage 219 are separately containing multiple operational amplifier (Operational amplifier; OP) 217a or operational amplifier 219a.
Positive polarity resistance string 213 is containing multiple first kind resistance 213a, and these first kind resistance 213a is electrically serially connected, the positive polarity gamma voltage V on first kind resistance 213a end points
r1Pv
rn-1P, V
rnPbe transferred into digital analog converter 215.One of them of the first end U electricity serial connection first kind resistance 213a of Equations of The Second Kind resistance 213b, wherein, the voltage on the first end U of Equations of The Second Kind resistance 213b, is less than the half of gamma reference voltage VREF, is namely less than 1/2VREF.The ratio of first kind resistance 213a and Equations of The Second Kind resistance 213b voltage drop can optionally adjust, as long as the summation of first kind resistance 213a voltage drop is greater than the voltage drop of Equations of The Second Kind resistance 213b, such as, the ratio of first kind resistance 213a and Equations of The Second Kind resistance 213b voltage drop can be 3:2, the number of first kind resistance 213a and the figure place of digital analog converter 215 present power side's relation of two, when digital analog converter 215 is 9, the number of first kind resistance 213a is then 2
9=512.
Negative polarity resistance string 211 is containing the 3rd quasi-resistance 211a and multiple 4th quasi-resistance 211b.The first end V of the 3rd quasi-resistance 211a receives gamma reference voltage VREF, 4th quasi-resistance 211b electricity is serially connected, the first end W of first the 4th quasi-resistance 211b is connected in series the second end W of the 3rd quasi-resistance 211a, and the voltage on the second end W of the 3rd quasi-resistance 211a, be greater than the half of gamma reference voltage VREF, be namely greater than 1/2VREF.The voltage drop ratio of the 3rd quasi-resistance 211a and the 4th quasi-resistance 211b can optionally adjust, as long as the voltage drop of the 3rd quasi-resistance 211a is less than the voltage drop summation of the 4th quasi-resistance 211b, such as, the voltage drop ratio of the 3rd quasi-resistance 211a and all 4th quasi-resistance 211b can be 2:3.The number of the 4th quasi-resistance 211b and the figure place of digital analog converter 215 present power side's relation of two, and wherein when digital analog converter 215 is 9, the number of the 4th quasi-resistance 211b is then 2
9=512.
In the middle of positive polarity resistance string 213 with negative polarity resistance string 211, second end of Equations of The Second Kind resistance 213b and the equal ground connection GND of the second end of last the 4th quasi-resistance 211b, in the middle of this embodiment, each first kind resistance 213a has identical resistance value with each the 4th quasi-resistance 211b, Equations of The Second Kind resistance 213b has identical resistance value with the 3rd quasi-resistance 211a, the resistance value of Equations of The Second Kind resistance 213b is greater than the resistance value of each first kind resistance 213a, the resistance value of the 3rd quasi-resistance 211a is greater than the resistance value of each the 4th quasi-resistance 211b, but also do not get rid of the resistance value collocation mode of other patterns.
In the middle of this embodiment, the positive and negative polarity according to passage divides resistance string, and the resistance number therefore in single polarity can be reduced in a large number, by 2 originally
10=1024 are reduced to 2
9=512, corresponding digital analog converter 215 is also 9 circuit by 10 circuit reductions originally, therefore can reduce circuit area in a large number.
Gamma voltage producing circuit 200 produces circuit (Bandgapreference generator) 201, amplifier 203, divider resistance string 204, digital analog converter 207 and amplifier 209 containing energy-gap reference voltage further, these circuit components be used for produce voltage signal and amplify, branch pressure voltage signal, produce suitable gamma reference voltage VREF.
Fig. 3 illustrates the gamma reference voltage generation circuit schematic diagram of embodiment of the present invention display device.The gamma reference voltage generation circuit 319 of display device is mainly containing nonvolatile memory 303, working storage 309, and controller 313.Nonvolatile memory 303 is containing the first data base 305 and the second data base 307, and to store first group of gamma reference voltage value and second group of gamma reference voltage value respectively, these gamma reference voltage values are the data of digital kenel.Working storage 309 is electrically connected nonvolatile memory 303, and this working storage 309 includes data base duplicate field 311.Controller 313 is electrically connected nonvolatile memory 303 and working storage 309, the data base handover information that this controller 313 transmits according to bus interface 301, determine the digital gamma voltage value the first data base 305 or the second data base 307 stored, copy to the data base duplicate field 311 of working storage 309, wherein, bus interface 301 can be universal serial bus (USB) interface or inter-integrated circuit (I2C) interface.
The data base handover information transmitted by bus interface 301, controller 313 can during system model switches, such as, during the switching of gamma curve (Gamma Curve), during the switching of two-dimensional state and three-dimensional state, determine the digital gamma voltage value stored by which data base, copy to the data base duplicate field 311 of working storage 309, in order to later use, therefore no longer need two groups of working storages to store digital gamma voltage value, only need one group of working storage, outside switching signal pin originally also can omit, utilize the bus interface and changeable data base that originally just exist, greatly reduce circuit area.
Gamma reference voltage generation circuit 319 is further containing multiple digital analog converter 315 and multiple operational amplifier 317 (only illustrate in Fig. 3 a digital analog converter 315 and an operational amplifier 317 as example), and a digital analog converter 315 corresponds to an operational amplifier 317.Digital analog converter 315 can directly be electrically connected working storage 309, and omit the multiplexer circuit originally existed, the complexity of further simplification circuit, the gamma reference voltage value of digital kenel is converted to the gamma reference voltage of simulation kenel by this digital analog converter 315, and then by operational amplifier 317, amplify and transmit the gamma reference voltage of simulating kenel.
The gamma voltage of above embodiment and gamma reference voltage generation circuit, resistance string is divided into two groups by the polarity according to passage, can cast out according to passage polarity the resistance be used to very less, resistance number can be reduced in a large number, therefore can reduce circuit area.On the other hand, then utilize bus interface to replace external pin originally to transmit the handover information of data base, reduce encapsulation volume, and only need one group of working storage except depositing gamma voltage value, further reduce circuit area.
Any illustration discussed in this instructions is only used for the purposes of explanation, the present invention that can't limit by any way or the scope of its illustration and meaning.Similarly, the present invention is not limited to the various embodiments that propose in this instructions.
Claims (10)
1. a gamma voltage producing circuit for display device, comprises:
Positive polarity resistance string, dividing potential drop gamma reference voltage is to provide the multiple positive polarity gamma voltages needed at least one positive polarity passage, and described positive polarity resistance string comprises:
Multiple first kind resistance, described multiple first kind resistance electricity is serially connected; And
At least one Equations of The Second Kind resistance, the described multiple first kind resistance of its first end electricity serial connection one of them, wherein, the voltage on the described first end of described Equations of The Second Kind resistance, is less than the half of described gamma reference voltage;
Negative polarity resistance string, gamma reference voltage described in dividing potential drop is to provide the multiple negative polarity gamma voltages needed at least one negative polarity passage, and described negative polarity resistance string comprises:
At least one 3rd quasi-resistance, its first end receives described gamma reference voltage; And
Multiple 4th quasi-resistance, described multiple 4th quasi-resistance electricity is serially connected, second end of described 3rd quasi-resistance of first end serial connection of first described 4th quasi-resistance, and the voltage on described second end of described 3rd quasi-resistance, be greater than the half of described gamma reference voltage.
2. gamma voltage producing circuit according to claim 1, the voltage drop ratio of wherein said multiple first kind resistance and described Equations of The Second Kind resistance is 3:2, and the voltage drop ratio of described 3rd quasi-resistance and described multiple 4th quasi-resistance is 2:3.
3. gamma voltage producing circuit according to claim 1, wherein said multiple positive polarity gamma voltage and described multiple negative polarity gamma voltage are transferred into multiple digital analog converter respectively, digital analog converter described in one corresponds to an operational amplifier, the number of described multiple first kind resistance or described multiple 4th quasi-resistance, presents power side's relation of two with the figure place of described digital analog converter.
4. gamma voltage producing circuit according to claim 3, wherein said digital analog converter is 9, and the number of described multiple first kind resistance or described multiple 4th quasi-resistance is then 2
9=512.
5. gamma voltage producing circuit according to claim 1, the second end of wherein said Equations of The Second Kind resistance and the equal ground connection of the second end of last the 4th quasi-resistance.
6. gamma voltage producing circuit according to claim 1, wherein each first kind resistance has identical resistance value with each the 4th quasi-resistance, and described Equations of The Second Kind resistance has identical resistance value with described 3rd quasi-resistance.
7. gamma voltage producing circuit according to claim 6, the resistance value of wherein said Equations of The Second Kind resistance is greater than the resistance value of each first kind resistance, and the resistance value of described 3rd quasi-resistance is greater than the resistance value of each the 4th quasi-resistance.
8. a gamma reference voltage generation circuit for display device, comprises:
Nonvolatile memory, comprises the first data base and the second data base, to store first group of gamma reference voltage value and second group of gamma reference voltage value respectively;
Working storage, is electrically connected described nonvolatile memory; And
Controller, be electrically connected described nonvolatile memory and described working storage, the data base handover information that described controller transmits according to bus interface, determines the described digital gamma voltage value described first data base or described second data base stored, copies to described working storage.
9. gamma reference voltage generation circuit according to claim 8, also comprises:
Digital analog converter, is directly electrically connected described working storage, and the described gamma reference voltage value of digital kenel is converted at least one gamma reference voltage of simulation kenel by described digital analog converter.
10. gamma reference voltage generation circuit according to claim 8, also comprise at least one operational amplifier, be electrically connected described digital analog converter, described digital analog converter corresponds to described operational amplifier, to amplify and to transmit the described gamma reference voltage of simulating kenel.
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|---|---|---|---|
| CN201410133701.2A CN104978936A (en) | 2014-04-03 | 2014-04-03 | Gamma reference voltage generation circuit of display apparatus and gamma voltage generation circuit of display apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410133701.2A CN104978936A (en) | 2014-04-03 | 2014-04-03 | Gamma reference voltage generation circuit of display apparatus and gamma voltage generation circuit of display apparatus |
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| CN201364723Y (en) * | 2009-03-12 | 2009-12-16 | 青岛海信电器股份有限公司 | Gamma caching circuit adapting to various LCDs and television adopting same |
| CN103390393A (en) * | 2013-07-19 | 2013-11-13 | 深圳市华星光电技术有限公司 | Method and device for producing gray-scale adjusting voltage, panel drive circuit and display panel |
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| JP2001195031A (en) * | 1999-10-27 | 2001-07-19 | Internatl Business Mach Corp <Ibm> | Reference potential generating circuit for gamma correction |
| CN1437085A (en) * | 2002-02-08 | 2003-08-20 | 精工爱普生株式会社 | Reference voltage generating circuit and generating method, display drive circuit and display |
| CN1954352A (en) * | 2004-03-17 | 2007-04-25 | 罗姆股份有限公司 | Gamma correction circuit, display panel, and display having them |
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