CN117316106A - OLED (organic light emitting diode) fast switching GAMMA circuit - Google Patents
OLED (organic light emitting diode) fast switching GAMMA circuit Download PDFInfo
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- CN117316106A CN117316106A CN202311612995.2A CN202311612995A CN117316106A CN 117316106 A CN117316106 A CN 117316106A CN 202311612995 A CN202311612995 A CN 202311612995A CN 117316106 A CN117316106 A CN 117316106A
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- vgmp1
- vgsp1
- negative feedback
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- 230000009467 reduction Effects 0.000 claims description 4
- 230000001629 suppression Effects 0.000 claims description 4
- 230000007246 mechanism Effects 0.000 abstract description 12
- 239000003990 capacitor Substances 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000009471 action Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008713 feedback mechanism Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The invention relates to the technical field of circuits, and discloses an OLED (organic light emitting diode) quick switching GAMMA circuit, which comprises: VGMP circuit, VGSP circuit, VGMP1 circuit, VGSP1 circuit, MUX circuit; according to the invention, the VGMP1 circuit and the VGSP1 circuit are added in the traditional GAMMA framework, and the VGMP1 circuit and the VGSP1 circuit are enabled to adjust the whole GAMMA circuit through correction of the compensation mechanism, and as the VGMP1 circuit and the VGSP1 circuit do not need to be externally hung with large capacitors, the required voltage value can be obtained through adjustment of the compensation mechanism very quickly, and the problem that the screen is easy to generate bright, dark and flickering due to long modulation time in the prior art is solved.
Description
Technical Field
The invention relates to the technical field of circuits, in particular to an OLED (organic light emitting diode) fast switching GAMMA circuit.
Background
For the intelligent terminal adopting the OLED screen, the larger the OLED screen is, the larger the wiring resistance of the OLED screen switch is, so that when the consumed current of the screen is large, the larger the voltage value of the working voltage inside the device is, and the problem of uneven display of the local or whole brightness of the screen is caused.
In the prior art, in order to solve the problem of uneven brightness, a remote point on the screen is pulled back to the integrated circuit for detection, and the difference value of the working voltage is obtained through the differential amplifying circuit and the logic operation circuit, and VGMP and VGSP of the LDO are modulated by the difference value to make offset compensation of the whole GAMMA so as to maintain the grid-source voltage of the PMOS transistor on the pixel.
Since VGMP and VGSP are susceptible to interference from external power supply voltage and ground, a large capacitor (1 to 4 uF) is hung to suppress noise. However, this also results in more charge and discharge time required to modulate the voltage levels of VGMP and VGSP, and too long a modulation time will be easy for the panel to be observed as a noticeable bright-dark flicker, requiring additional dimming techniques to overstate this time.
Disclosure of Invention
The invention aims to provide an OLED (organic light emitting diode) fast switching GAMMA circuit, which aims to solve the problem that a screen is easy to generate bright, dark and flickering due to long modulation time in the prior art.
The invention provides an OLED fast switching GAMMA circuit, which comprises:
VGMP circuit, VGSP circuit, VGMP1 circuit, VGSP1 circuit, MUX circuit;
the VGMP1 circuit is electrically connected with the VGMP circuit and the MUX circuit respectively; the VGMP1 circuit is used for carrying out difference compensation operation on the VGMP circuit to obtain a VGMP1 signal and transmitting the VGMP1 signal to the MUX circuit;
the VGSP1 circuit is electrically connected with the VGSP circuit and the MUX circuit respectively; the VGSP1 circuit is used for carrying out difference compensation operation on the VGSP circuit to obtain a VGSP1 signal, and transmitting the VGSP1 signal to the MUX circuit.
Preferably, the VGMP1 circuit comprises a first MUX and a first negative feedback amplifier arranged in series; the first MUX is used for receiving a plurality of input signals and converting the input signals into an output signal, and the first negative feedback amplifier is used for noise reduction and interference suppression of the first MUX.
Preferably, the VGSP1 circuit comprises a second MUX and a second negative feedback amplifier arranged in series; the second MUX is used for receiving a plurality of input signals and converting the input signals into an output signal, and the second negative feedback amplifier is used for noise reduction and interference suppression of the second MUX.
Preferably, the VGMP circuit includes a third negative feedback amplifier and a first voltage dividing resistor, where the first voltage dividing resistor is electrically connected to an output end of the third negative feedback amplifier, the third negative feedback amplifier is configured to receive a voltage signal and perform GAMMA correction, and the first voltage dividing resistor is configured to adjust voltage division in the circuit.
Preferably, the VGSP circuit includes a fourth negative feedback amplifier and a second voltage dividing resistor, where the second voltage dividing resistor is electrically connected to an output end of the fourth negative feedback amplifier, the fourth negative feedback amplifier is configured to receive a voltage signal and perform GAMMA correction, and the second voltage dividing resistor is configured to adjust a voltage division in the circuit.
Preferably, the MUX circuit includes a plurality of muxes and a plurality of logic operation circuits;
each MUX circuit is electrically connected with one corresponding logic operation circuit.
The invention provides an OLED (organic light emitting diode) quick switching GAMMA circuit, which has the following beneficial effects:
according to the invention, the VGMP1 circuit and the VGSP1 circuit are added in the traditional GAMMA framework, and the VGMP1 circuit and the VGSP1 circuit are enabled to adjust the whole GAMMA circuit through correction of the compensation mechanism, and as the VGMP1 circuit and the VGSP1 circuit do not need to be externally hung with large capacitors, the required voltage value can be obtained through adjustment of the compensation mechanism very quickly, and the problem that the screen is easy to generate bright, dark and flickering due to long modulation time in the prior art is solved.
Drawings
FIG. 1 is a schematic diagram of an OLED fast switching GAMMA circuit according to an embodiment of the present invention;
FIG. 2 is a diagram showing the overall structure of GAMMA in a conventional scheme according to an embodiment of the invention;
FIG. 3 is a schematic diagram showing a part of the structure of GAMMA in a conventional scheme according to an embodiment of the invention;
FIG. 4 is a schematic diagram of a compensation mechanism in a conventional scheme provided by an embodiment of the present invention;
FIG. 5 is a schematic diagram of a compensation mechanism for OLED fast switching GAMMA circuit according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a poe wr routing of an OLED screen according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., based on the azimuth or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus terms describing the positional relationship in the drawings are merely illustrative and should not be construed as limitations of the present patent, and specific meanings of the terms described above may be understood by those skilled in the art according to specific circumstances.
The implementation of the present invention will be described in detail below with reference to specific embodiments.
Referring to fig. 1, 2, 3, 4, 5 and 6, a preferred embodiment of the present invention is provided.
The invention provides an OLED fast switching GAMMA circuit, comprising:
VGMP circuit, VGSP circuit, VGMP1 circuit, VGSP1 circuit, MUX circuit.
Specifically, the VGMP1 circuit is electrically connected to the VGMP circuit and the MUX circuit, respectively; the VGMP1 circuit is used for carrying out difference compensation operation on the VGMP circuit to obtain a VGMP1 signal and transmitting the VGMP1 signal to the MUX circuit; the VGSP1 circuit is electrically connected with the VGSP circuit and the MUX circuit respectively; the VGSP1 circuit is used for performing difference compensation operation on the VGSP circuit to obtain a VGSP1 signal, and transmitting the VGSP1 signal to the MUX circuit.
Referring to fig. 2, in the conventional GAMMA architecture, the GAMMA circuit is divided into three modules: VGMP circuit, VGSP circuit and MUX circuit; wherein, VGMP circuit and VGSP circuit are connected with MUX circuit to realize offset compensation of whole GAMMA circuit.
Since VGMP and VGSP are susceptible to interference from external POWER AVDD and group, large capacitances (1 to 4 uF) are hung to suppress noise. However, this also requires more charge and discharge time to modulate LEVELs of VGMP and VGSP, and too long a modulation time will easily be observed as noticeable bright and dark flicker on the panel, requiring additional dimming techniques to overstate the time.
Referring to fig. 4, in the conventional GAMMA architecture, the VGMP circuit and the VGSP circuit perform modulation according to the difference of EVLDD, so as to compensate the Vsg of PMOS on the PIXEL of the offset compensation position of the whole GAMMA, and the signal of the comparison circuit is transmitted to the reference circuit and is subjected to GAMMA correction by the reference circuit; specifically, the difference to be compensated is calculated first, and then VGMP and VGSP are changed to change the entire GAMMA value.
More specifically, in one embodiment of the present invention, the VGMP circuit, the VGSP circuit, and the MUX circuit in the conventional GAMMA architecture are split, and the VGMP1 circuit and the VGSP1 circuit are added, so that the VGMP1 circuit is electrically connected to the VGMP circuit and the MUX circuit, and the VGSP1 circuit is electrically connected to the VGSP circuit and the MUX circuit, respectively, to form a new GAMMA architecture.
It should be noted that, in the new GAMMA architecture, instead of modulating the difference value of the EVLDD by the VGMP circuit and the VGSP circuit, the newly added VGMP1 circuit and VGSP1 circuit perform corresponding adjustment according to the result of the difference compensation operation, so as to realize adjustment of the whole GAMMA circuit; specifically, in the new compensation mechanism, the compensation object is replaced from VGMP and VGSP to VGMP1 and VGSP1, and VGMP1 and VGSP1 are selected by means of corresponding MUX circuits, so as to realize compensation.
More specifically, based on the above design, the scheme of directly adjusting the VGMP1 circuit and the VGSP1 circuit in the conventional design can be replaced by newly adding the VGMP1 circuit and the VGSP1 circuit and the compensation mechanism for corresponding correction, the VGMP1 circuit and the VGSP1 circuit are the sources of the GAMMA resistor string, the change of the VGMP1 circuit and the VGSP1 circuit will change the whole GAMMA, and the VGMP1 circuit and the VGSP1 circuit do not need to be externally hung with a large capacitor, so that the required voltage value can be adjusted very quickly through the compensation mechanism, and thus no additional dimming technology is needed to avoid the flicker problem caused during compensation.
Referring to fig. 5, fig. 5 is a modified compensation mechanism, in the conventional GAMMA scheme, the GAMMA source is directly compensated by the VGMP circuit and the VGSP circuit, and because VGMP and VGSP are easily interfered by external POWER AVDD and group, large capacitors (1-4 uF) are hung to suppress noise, which causes more charge and discharge time to be required for modulating LEVEL of VGMP and VGSP, and too long modulation time will be easy for the panel picture to be observed as obvious bright and dark flicker, and additional dimming technology is required to overstate the time; in the embodiment of the invention, a VGMP1 circuit is added between VGMP and GAMMA, a VGSP1 circuit is added between VGSP and GAMMA, the VGMP1 circuit and the VGSP1 circuit can directly complete the compensation of the GAMMA circuit, and the signals received by the comparison circuit can directly carry out GAMMA correction through the comparison table.
The invention provides an OLED (organic light emitting diode) quick switching GAMMA circuit, which has the following beneficial effects:
according to the invention, the VGMP1 circuit and the VGSP1 circuit are added in the traditional GAMMA framework, and the VGMP1 circuit and the VGSP1 circuit are enabled to adjust the whole GAMMA circuit through correction of the compensation mechanism, and as the VGMP1 circuit and the VGSP1 circuit do not need to be externally hung with large capacitors, the required voltage value can be obtained through adjustment of the compensation mechanism very quickly, and the problem that the screen is easy to generate bright, dark and flickering due to long modulation time in the prior art is solved.
Preferably, the VGMP1 circuit comprises a first MUX and a first negative feedback amplifier arranged in series.
Specifically, a first MUX in the VGMP1 circuit is electrically connected with the VGMP circuit, and a first negative feedback amplifier is electrically connected with the MUX circuit.
It should be noted that MUX is an abbreviation of Multiplexer (MUX), which is an electronic circuit or device for selectively converting a plurality of input signals into one output signal. The main function of the MUX is to connect one of a plurality of data sources or signals to a single output channel, thereby effectively enabling multiplexing and multiplexing of data.
In the embodiment provided by the invention, a plurality of MUXs exist, and the first MUX is the number of one MUX of the plurality of MUXs in the circuit to refer to the MUX arranged in the VGMP1 circuit.
It should be noted that, the feedback amplifier is a common amplifier circuit, and it introduces a negative feedback mechanism to return a part of the output signal to the input terminal, so as to improve the performance and stability of the amplifier. The basic principle of a negative feedback amplifier is to cancel or reduce an input signal by comparing a portion of an output signal with the input signal and generating a difference signal, which is then fed back to the input of the amplifier. This achieves the following effects: increasing the stability of the amplifier: the negative feedback can reduce the gain of the amplifier and reduce the sensitivity of the amplifier, so that the amplifier is more stable to disturbance and change of the external environment. For example, the effect of temperature variations, device parameter drift, etc. on the amplifier may be suppressed by negative feedback. Reducing nonlinear distortion: the negative feedback can reduce nonlinear distortion of the amplifier and improve linearity of the output signal. By feeding back a part of the output signal to the input, the non-linear characteristics of the non-linear element can be compensated. Expanding bandwidth: negative feedback may increase the bandwidth of the amplifier so that the amplifier can transmit higher frequency signals. By reducing the gain of the amplifier, the cut-off frequency of the amplifier can be reduced, thereby expanding the bandwidth of the amplifier. Negative feedback amplifiers are typically composed of a differential amplifier and a feedback network. The feedback network generates a feedback signal according to the difference signal, subtracts the feedback signal from the input signal, and then amplifies the difference signal and feeds the amplified difference signal back to the differential amplification.
In the embodiment provided by the invention, a plurality of negative feedback amplifiers are arranged, and the number of one of the plurality of negative feedback amplifiers in the circuit of the first negative feedback amplifier is used for referring to the negative feedback amplifier arranged in the VGMP1 circuit.
Preferably, the VGSP1 circuit includes a second MUX and a second negative feedback amplifier arranged in series.
Specifically, a second MUX in the VGSP1 circuit is electrically connected with the VGSP circuit, and a second negative feedback amplifier is electrically connected with the MUX circuit.
It will be appreciated that the configuration of the VGSP1 circuit is consistent with the configuration of the VGMP1 circuit, that is, the function assumed by the second MUX in the VGSP1 circuit is consistent with the function assumed by the first MUX in the VGMP1 circuit, and the function assumed by the second negative feedback amplifier in the VGSP1 circuit is consistent with the function assumed by the first negative feedback amplifier in the VGMP1 circuit.
Preferably, the VGMP circuit includes a third negative feedback amplifier and a first voltage dividing resistor, and the first voltage dividing resistor is electrically connected to an output terminal of the third negative feedback amplifier.
Specifically, the third negative feedback amplifier is used to compare the input signal with the reference voltage through the negative feedback mechanism to determine the state of the output signal, and in the VGMP circuit, the third negative feedback amplifier may be used to detect the voltage level for GAMMA correction.
More specifically, the second resistor is used to adjust the voltage division in the circuit to ensure that the correct voltage level is used for GAMMA correction.
Preferably, the VGSP circuit comprises a fourth negative feedback amplifier and a second voltage dividing resistor, and the second voltage dividing resistor is electrically connected with the output end of the fourth negative feedback amplifier.
Specifically, the action of the fourth negative feedback amplifier in the VGSP circuit is consistent with the action of the third negative feedback amplifier in the VGMP circuit, and the action of the second voltage dividing resistor in the VGSP circuit is consistent with the action of the first voltage dividing resistor in the VGMP circuit, namely, the fourth negative feedback amplifier is used for detecting the voltage level to perform GAMMA correction, and the second voltage dividing resistor is used for adjusting the voltage division in the circuit to ensure that the correct voltage level is used for GAMMA correction.
Preferably, the MUX circuit includes a number of muxes and a number of logic operation circuits; each MUX circuit is electrically connected with a corresponding logic operation circuit.
Specifically, the MUX circuits are configured to receive a plurality of input signals and select one or more output signals therefrom for transmission to the logic operation circuit.
More specifically, each MUX circuit corresponds to one logic operation circuit and is electrically connected to the corresponding logic operation circuit.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (6)
1. An OLED fast switching GAMMA circuit, comprising:
VGMP circuit, VGSP circuit, VGMP1 circuit, VGSP1 circuit, MUX circuit;
the VGMP1 circuit is electrically connected with the VGMP circuit and the MUX circuit respectively; the VGMP1 circuit is used for carrying out difference compensation operation on the VGMP circuit to obtain a VGMP1 signal and transmitting the VGMP1 signal to the MUX circuit;
the VGSP1 circuit is electrically connected with the VGSP circuit and the MUX circuit respectively; the VGSP1 circuit is used for carrying out difference compensation operation on the VGSP circuit to obtain a VGSP1 signal, and transmitting the VGSP1 signal to the MUX circuit.
2. The OLED fast switching GAMMA circuit of claim 1 wherein the VGMP1 circuit includes a first MUX and a first negative feedback amplifier arranged in series; the first MUX is used for receiving a plurality of input signals and converting the input signals into an output signal, and the first negative feedback amplifier is used for noise reduction and interference suppression of the first MUX.
3. The OLED fast switching GAMMA circuit of claim 1 wherein the VGSP1 circuit includes a second MUX and a second negative feedback amplifier arranged in series; the second MUX is used for receiving a plurality of input signals and converting the input signals into an output signal, and the second negative feedback amplifier is used for noise reduction and interference suppression of the second MUX.
4. The OLED fast switching GAMMA circuit of claim 1 wherein the VGMP circuit includes a third negative feedback amplifier and a first divider resistor, the first divider resistor being electrically connected to an output of the third negative feedback amplifier, the third negative feedback amplifier being configured to receive a voltage signal and perform GAMMA correction, the first divider resistor being configured to adjust a voltage division in the circuit.
5. The OLED fast switch GAMMA circuit as claimed in claim 1, wherein the VGSP circuit includes a fourth negative feedback amplifier and a second voltage divider resistor, the second voltage divider resistor being electrically connected to an output of the fourth negative feedback amplifier, the fourth negative feedback amplifier being configured to receive a voltage signal and perform GAMMA correction, the second voltage divider resistor being configured to adjust a voltage division in the circuit.
6. The OLED fast switching GAMMA circuit of claim 1, wherein the MUX circuit includes a plurality of muxes and a plurality of logic circuits;
each MUX circuit is electrically connected with one corresponding logic operation circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311612995.2A CN117316106A (en) | 2023-11-29 | 2023-11-29 | OLED (organic light emitting diode) fast switching GAMMA circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311612995.2A CN117316106A (en) | 2023-11-29 | 2023-11-29 | OLED (organic light emitting diode) fast switching GAMMA circuit |
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| Publication Number | Publication Date |
|---|---|
| CN117316106A true CN117316106A (en) | 2023-12-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311612995.2A Pending CN117316106A (en) | 2023-11-29 | 2023-11-29 | OLED (organic light emitting diode) fast switching GAMMA circuit |
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| CN (1) | CN117316106A (en) |
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