CN113963665A - OLED simulation gamma dimming device and method - Google Patents
OLED simulation gamma dimming device and method Download PDFInfo
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- CN113963665A CN113963665A CN202111317888.8A CN202111317888A CN113963665A CN 113963665 A CN113963665 A CN 113963665A CN 202111317888 A CN202111317888 A CN 202111317888A CN 113963665 A CN113963665 A CN 113963665A
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- 238000004088 simulation Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims description 12
- 101100067427 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) FUS3 gene Proteins 0.000 claims description 10
- 101100015484 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GPA1 gene Proteins 0.000 claims description 10
- 239000003086 colorant Substances 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 2
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- 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]
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- 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
- G09G2320/06—Adjustment of display parameters
- G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
Abstract
The invention discloses an OLED simulation gamma dimming device, which relates to the field of OLEDs and comprises: the time control module is used for controlling the three-color pixel gray scale module to generate different sub-pixel gray scale voltages in different time; the gamma module is used for outputting corresponding pixel gamma compensation voltage and adjusting the brightness of the three-color OLED; the three-color pixel gray scale module is used for sequentially outputting different sub-pixel gray scale voltages to the driving module; the driving module is used for driving the OLED panel module to work; an OLED panel module for outputting three-color OLED light; compared with the prior art, the invention has the beneficial effects that: three groups of digital/simulation converters are added to carry out corresponding voltage compensation in the face of different luminous efficiencies of the three-color OLED; by increasing the output voltage of 50 steps, the accuracy of the gamma conversion table is increased, so that different colors have enough fineness and range in gamma compensation and dimming.
Description
Technical Field
The invention relates to the field of OLEDs, in particular to an OLED simulation gamma dimming device and method.
Background
An OLED (Organic Light-Emitting Diode), also called an Organic electroluminescent Display, an Organic Light-Emitting semiconductor (OLED). The OLED is a current-type organic light emitting device, and emits light by injection and recombination of carriers, and the intensity of light emission is proportional to the injected current.
The relationship between the gamma output voltage and the brightness is shown in fig. 1, when the output voltages VGM0 to VGML are non-linear curve relationship, the output voltage between VGML and VGMH is linear curve relationship.
Generally, the GAMMA (GAMMA) output voltages VGML and VGMH are fixed values, as shown in fig. 2, but the light emitting efficiencies of the OLED panels r (red), g (green), and b (blue) are respectively different, and the light emitting efficiencies of the OLED panels r (red), g (green), and b (blue) generated by different panel factories are also different, so that the GAMMA (GAMMA) 2.2 curve acceptable to human eyes cannot be adjusted.
The OLED emulation gamma on the market today has the following disadvantages: (1): generally, the VGML voltage of the cuma is not adjustable, but the OLED panel is self-luminous, and the light emitting efficiency of r (red), g (green), and b (blue) are respectively different, so that the VGML voltage cannot be adjusted to be optimized during dimming.
(2) The OLED panel often has different R (red), G (green), B (blue) light-emitting efficiencies, so that the difference between the three color voltage ranges of R (red), G (green), B (blue) is too large, in order to satisfy the precise gamma compensation value, the gamma output voltage thereof should be adjusted, so that the differences between the respective light-emitting luminances of R (red), G (green), B (blue) are not too large, so that the displayed color is more similar to the real color.
(3): in terms of the dimming mechanism, if the dimming is divided into 50 steps for brightness adjustment, the gamma output voltage and brightness are generally interpolated from VGMH and VGML to halve 50 steps, and the brightness corresponding to each step of dimming of R/G/B is greatly different due to the respective differences of the R (red), G (green), and B (blue) luminous efficiencies. Therefore, there is a need for an improvement of the existing OLED emulation gamma dimming device.
Disclosure of Invention
The present invention is directed to an OLED emulation gamma dimming device and method, so as to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
an OLED emulation gamma dimming device, comprising:
the time control module is used for controlling the three-color pixel gray scale module to generate different sub-pixel gray scale voltages in different time;
the gamma module is used for outputting corresponding pixel gamma compensation voltage and adjusting the brightness of the three-color OLED;
the three-color pixel gray scale module is used for sequentially outputting different sub-pixel gray scale voltages to the driving module;
the driving module is used for driving the OLED panel module to work;
an OLED panel module for outputting three-color OLED light;
the time control module is connected with the gamma module and the three-color pixel gray scale module, the gamma module is connected with the driving module, the three-color pixel gray scale module is connected with the driving module, and the driving module is connected with the OLED panel module.
As a still further scheme of the invention: the gamma module comprises a converter DAC1, a converter DAC2 and a converter DAC3, wherein a first end of the converter DAC1 is connected with a first end of the resistor group R1, a second end of the converter DAC1 is connected with a first end of the output voltage VGM0, a first end of the converter DAC2 is connected with a second end of the resistor group R1, a second end of the converter DAC2 is connected with a first end of the output voltage VGML, a first end of the converter DAC3 is connected with a third end of the resistor group R1, and a second end of the converter DAC3 is connected with a first end of the output voltage VGMH.
The OLED simulation gamma dimming method is applied to the OLED simulation gamma dimming device, and comprises the following steps: step 1: the time control module controls the voltage output to the three-color pixel gray scale module and the gamma module by setting time; step 2: the three-color pixel gray scale module outputs sub-pixel gray scale voltages of only one color for R (red), G (green) and B (blue) OLEDs at the same time, and sequentially outputs the three-color pixel gray scale voltages to the driving module; and step 3: the gamma module outputs corresponding pixel gamma compensation voltage aiming at different luminous efficiencies of R (red), G (green) and B (blue) three-color OLEDs, and properly adjusts the luminous brightness of the three-color OLEDs; and 4, step 4: the driving module drives the OLED panel module to emit three-color OLED light according to the voltages input by the three-color pixel gray scale module and the gamma module.
As a still further scheme of the invention: in the step 1: the time control module controls the three-color OLEDs R (red), G (green) and B (blue) through the time controller to work in different time periods.
As a still further scheme of the invention: in the step 2: the three-color pixel gray scale module generates DAC1_ R/DAC2_ R/DAC3_ R, DAC1_ G/DAC2_ G/DAC3_ G and DAC1_ B/DAC2_ B/DAC3_ B according to whether R (red), G (green) and B (blue) three-color OLEDs work or not at different time periods, and only one color of sub-pixel gray scale voltage is output to the driving module at the same time.
As a still further scheme of the invention: in the step 3: the gamma module compensates output voltages VGM0, VGML and VGMH aiming at different luminous efficiencies of R (red), G (green) and B (blue) three-color OLEDs;
when R (red) emits light, compensation voltages of VGM0_ R, VGML _ R and VGMH _ R are generated; when G (green) emits light, compensation voltages of VGM0_ G, VGML _ G and VGMH _ G are generated, and when B (blue) emits light, compensation voltages of VGM0_ B, VGML _ B and VGMH _ B are generated;
the output voltages VGMH and VGML are equally divided into 50 steps, and the voltages of VGML and VGMH are controlled because of the different luminous efficiencies of R (red), G (green) and B (blue), so that the brightness corresponding to each step of light modulation of R/G/B is similar.
As a still further scheme of the invention: in the step 4: the driving module receives the compensation voltage of the gamma module and the sub-pixel gray scale voltage of the three-color pixel gray scale module so as to drive the OLED panel module to emit light.
Compared with the prior art, the invention has the beneficial effects that: three groups of digital/simulation converters are added to carry out corresponding voltage compensation in the face of different luminous efficiencies of the three-color OLED; by increasing the output voltage of 50 steps, the accuracy of the gamma conversion table is increased, so that different colors have enough fineness and range in gamma compensation and dimming.
Drawings
Fig. 1 is a graph of a general gamma output voltage versus brightness.
FIG. 2 is a circuit diagram of a generic Gamma IC architecture.
FIG. 3 is a circuit diagram of an emulated gamma architecture.
FIG. 4 is a graph of R/G/B three-color gamma output voltage versus brightness.
Fig. 5 is a schematic diagram of an OLED emulation gamma dimming device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
Referring to fig. 5, an OLED gamma dimming simulation device includes:
the time control module is used for controlling the three-color pixel gray scale module to generate different sub-pixel gray scale voltages in different time;
the gamma module is used for outputting corresponding pixel gamma compensation voltage and adjusting the brightness of the three-color OLED;
the three-color pixel gray scale module is used for sequentially outputting different sub-pixel gray scale voltages to the driving module;
the driving module is used for driving the OLED panel module to work;
an OLED panel module for outputting three-color OLED light;
the time control module is connected with the gamma module and the three-color pixel gray scale module, the gamma module is connected with the driving module, the three-color pixel gray scale module is connected with the driving module, and the driving module is connected with the OLED panel module.
In this embodiment: referring to fig. 3, the gamma module includes a converter DAC1, a converter DAC2, and a converter DAC3, wherein a first terminal of the converter DAC1 is connected to a first terminal of the resistor group R1, a second terminal of the converter DAC1 is connected to a first terminal of the output voltage VGM0, a first terminal of the converter DAC2 is connected to a second terminal of the resistor group R1, a second terminal of the converter DAC2 is connected to a first terminal of the output voltage VGML, a first terminal of the converter DAC3 is connected to a third terminal of the resistor group R1, and a second terminal of the converter DAC3 is connected to a first terminal of the output voltage VGMH.
The converters DAC1, DAC2, and DAC3 compensate the output voltages VGM0, VGML, and VGMH according to the different luminous efficiencies of the input r (red), g (green), and b (blue) three-color OLEDs.
The OLED simulation gamma dimming method is applied to the OLED simulation gamma dimming device, and comprises the following steps: step 1: the time control module controls the voltage output to the three-color pixel gray scale module and the gamma module by setting time; step 2: the three-color pixel gray scale module outputs sub-pixel gray scale voltages of only one color for R (red), G (green) and B (blue) OLEDs at the same time, and sequentially outputs the three-color pixel gray scale voltages to the driving module; and step 3: the gamma module outputs corresponding pixel gamma compensation voltage aiming at different luminous efficiencies of R (red), G (green) and B (blue) three-color OLEDs, and properly adjusts the luminous brightness of the three-color OLEDs; and 4, step 4: the driving module drives the OLED panel module to emit three-color OLED light according to the voltages input by the three-color pixel gray scale module and the gamma module.
In this embodiment: referring to fig. 5, in step 1: the time control module controls the three-color OLEDs R (red), G (green) and B (blue) through the time controller to work in different time periods.
The time controller is a switching device capable of controlling the on or off of a circuit according to a set time, that is, controlling an electric appliance. Many time controllers also have programmable and cyclic functions, so that the light emitting conditions of (red), g (green), b (blue) three-color OLEDs are controlled by the time controllers.
In this embodiment: referring to fig. 5, in step 2: the three-color pixel gray scale module generates DAC1_ R/DAC2_ R/DAC3_ R, DAC1_ G/DAC2_ G/DAC3_ G and DAC1_ B/DAC2_ B/DAC3_ B according to whether R (red), G (green) and B (blue) three-color OLEDs work or not at different time periods, and only one color of sub-pixel gray scale voltage is output to the driving module at the same time.
In this embodiment: referring to fig. 3, 4 and 5, in step 3: the gamma module compensates output voltages VGM0, VGML and VGMH aiming at different luminous efficiencies of R (red), G (green) and B (blue) three-color OLEDs;
when R (red) emits light, compensation voltages of VGM0_ R, VGML _ R and VGMH _ R are generated; when G (green) emits light, compensation voltages of VGM0_ G, VGML _ G and VGMH _ G are generated, and when B (blue) emits light, compensation voltages of VGM0_ B, VGML _ B and VGMH _ B are generated;
the output voltages VGMH and VGML are equally divided into 50 steps, and the voltages of VGML and VGMH are controlled because of the different luminous efficiencies of R (red), G (green) and B (blue), so that the brightness corresponding to each step of light modulation of R/G/B is similar.
Through three sets of N- bit DACs 1, 2 and DACs 3 (digital/analog converters), wherein the output voltages VGM0, VGML and VGMH can be independently adjusted and controlled, the VGM0, VGML and VGMH can be properly adjusted for different light-emitting efficiencies of R (red), g (green), b (blue) three-color OLEDs, wherein when R (red) emits light, the gamma integrated circuit generates respective voltages VGM0_ R, VGML _ R and VGMH _ R, and the voltage of the gamma output is utilized to properly adjust the light-emitting brightness of R (red). When G (green) emits light, the gamma IC generates respective voltages of VGM 0-G, VGML _ G and VGMH _ G, and the voltage of the gamma output is used to properly adjust the light emitting brightness of G (green). When B (blue) emits light, the gamma ic generates voltages of VGM0_ B, VGML _ B and VGMH _ B, and the voltages of the gamma outputs are used to properly adjust the emission luminance of B (blue), so that the emission luminances of R (red), G (green), and B (blue) are uniform, and the gamma ics are designed as individually adjustable VGM0_ R/VGML _ R/VGMH _ R and VGM0_ G/VGML _ G/VGMH _ G and VGM0_ B/VGML _ B/VGMH _ B of three colors of R/G/B, thereby increasing the selection accuracy of the gamma compensation voltages of the three colors of R/G/B, and obtaining a gamma output voltage versus luminance graph of the three colors of R/G/B, as shown in fig. 4.
In this embodiment: referring to fig. 5, in step 4: the driving module receives the compensation voltage of the gamma module and the sub-pixel gray scale voltage of the three-color pixel gray scale module so as to drive the OLED panel module to emit light.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. An OLED simulation gamma dimming device, which is used in the same way as the OLED simulation gamma dimming device:
the OLED emulation gamma dimming device comprises:
the time control module is used for controlling the three-color pixel gray scale module to generate different sub-pixel gray scale voltages in different time;
the gamma module is used for outputting corresponding pixel gamma compensation voltage and adjusting the brightness of the three-color OLED;
the three-color pixel gray scale module is used for sequentially outputting different sub-pixel gray scale voltages to the driving module;
the driving module is used for driving the OLED panel module to work;
an OLED panel module for outputting three-color OLED light;
the time control module is connected with the gamma module and the three-color pixel gray scale module, the gamma module is connected with the driving module, the three-color pixel gray scale module is connected with the driving module, and the driving module is connected with the OLED panel module.
2. The OLED emulation gamma dimming device of claim 1, wherein the gamma module comprises a converter DAC1, a converter DAC2, a converter DAC3, wherein a first terminal of the converter DAC1 is connected to a first terminal of the resistor group R1, a second terminal of the converter DAC1 is connected to a first terminal of the output voltage VGM0, a first terminal of the converter DAC2 is connected to a second terminal of the resistor group R1, a second terminal of the converter DAC2 is connected to a first terminal of the output voltage VGML, a first terminal of the converter DAC3 is connected to a third terminal of the resistor group R1, and a second terminal of the converter DAC3 is connected to a first terminal of the output voltage VGMH.
3. An OLED emulation gamma dimming method applied to the OLED emulation gamma dimming device according to any one of claims 1 and 2, the method comprising: step 1: the time control module controls the voltage output to the three-color pixel gray scale module and the gamma module by setting time; step 2: the three-color pixel gray scale module outputs sub-pixel gray scale voltages of only one color for R, G, B three-color OLEDs at the same time, and sequentially outputs the three-color pixel gray scale voltages to the driving module; and step 3: the gamma module outputs corresponding pixel gamma compensation voltage aiming at the R, G, B different luminous efficiencies of the three-color OLED, and properly adjusts the luminous brightness of the three-color OLED; and 4, step 4: the driving module drives the OLED panel module to emit three-color OLED light according to the voltages input by the three-color pixel gray scale module and the gamma module.
4. The OLED simulation gamma dimming method according to claim 3, wherein in step 1: the time control module controls R, G, B the three-color OLED by the time controller to work in different time periods.
5. The OLED simulation gamma dimming method according to claim 3, wherein in the step 2: the three-color pixel gray scale module generates DAC1_ R/DAC2_ R/DAC3_ R, DAC1_ G/DAC2_ G/DAC3_ G and DAC1_ B/DAC2_ B/DAC3_ B according to the presence or absence of the R, G, B three-color OLED in different time periods, and sub-pixel gray scale voltages of only one color are output to the driving module at the same time.
6. The OLED simulation gamma dimming method according to claim 3, wherein in step 3: the gamma module compensates output voltages VGM0, VGML and VGMH aiming at the different luminous efficiencies of R, G, B three-color OLEDs;
generating compensation voltages of VGM0_ R, VGML _ R and VGMH _ R when R emits light; generating compensation voltages of VGM0_ G, VGML _ G and VGMH _ G when G emits light, and generating compensation voltages of VGM0_ B, VGML _ B and VGMH _ B when B emits light;
the output voltage VGMH and VGML are equally divided into 50 steps, and the voltage of VGML and VGMH is controlled due to the difference of R, G, B luminous efficiency, so that the brightness corresponding to each step of light modulation of R/G/B is similar.
7. The OLED simulation gamma dimming method according to claim 3, wherein in step 4: the driving module receives the compensation voltage of the gamma module and the sub-pixel gray scale voltage of the three-color pixel gray scale module so as to drive the OLED panel module to emit light.
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