CN113963657A - Digital-analog hybrid drive ULED method - Google Patents
Digital-analog hybrid drive ULED method Download PDFInfo
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- CN113963657A CN113963657A CN202111351846.6A CN202111351846A CN113963657A CN 113963657 A CN113963657 A CN 113963657A CN 202111351846 A CN202111351846 A CN 202111351846A CN 113963657 A CN113963657 A CN 113963657A
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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]
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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
- G09G3/34—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 by control of light from an independent source
- G09G3/3406—Control of illumination source
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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
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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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 a digital-analog hybrid drive ULED method, which relates to the field of ULED drive and comprises the following steps: step 1: selecting a subframe for gamma2.2 low gray scale processing; step 2: increasing VL1 to VLN for low gray scale selection and no brightness linearity; and step 3: fine adjustment is carried out through the Frame X duty, and the situation that the voltage is lower than the threshold when low gray scale selection is carried out in the step 2 is avoided; and 4, step 4: compared with the prior art, the brightness selection method has the beneficial effects that: compared with the traditional digital or digital-analog hybrid method, the method provided by the invention can realize the gamma2.2 picture quality without spending too much area cost; the selection of VL1 to VLN can be selected together with the independent duty ratio, so as to avoid the condition of uneven picture caused by too low voltage to the maximum.
Description
Technical Field
The invention relates to the field of ULED driving, in particular to a digital-analog hybrid driving ULED method.
Background
The ULED is a display image quality technology processing engine developed for electronic medical display and liquid crystal televisions, adopts multi-partition independent backlight control and Hiview picture engine technology, has great improvement in the aspects of picture brightness, picture contrast, picture layering, dark field details, color accurate reduction, picture fluency and response speed compared with the traditional LED display, and has image quality shown in that a plurality of subjective evaluation data comprehensively surpass that of an OLED. The current common drivers include pure digital display driver and digital-analog hybrid display driver.
In order to realize the display capability of gamma2.2, the contrast between the highest brightness and the lowest brightness needs to be larger than 60k, i.e. at least 16 bits of resolution is needed to meet the requirement basically, but the cost is large area analog and digital requirement, and the chip area cost is greatly increased.
Referring to fig. 1, the digital-analog hybrid display driving:
(1): each Frame (Frame) was divided into multiple frames (Frame 1/2/3/. ANG.) and the open time for each Frame was 1T/2T/4T/8T/16T ….
(2): the voltages V0-VN are chosen to be linear in brightness, i.e., N is N times the brightness of 1.
(3): by using the method of the two points a/b, a plurality of combinations of display brightness can be generated
(4): in this system, we assume that under the conditions of N =9 and 5 frames, a combination of 0 to 279 can be generated, which can meet the requirement of selecting 256 display outputs in a general 8-bit display system.
The contrast ratio of this method is only 279, which is far from the basic display requirement of Gamma 2.2.
Such architecture is to meet the basic display requirements: n =256 and 9 frames are required, a faster refresh rate is required, and in general, panel is rarely supported above 5 frames, and then the requirement of N =256 will also greatly increase the chip area cost.
The shortcomings of pure digital display driving and digital-analog hybrid display driving require improvements in the ULED driving.
Disclosure of Invention
The present invention is directed to a digital-analog hybrid drive ULED method to solve the above-mentioned problems of the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
a digital-analog hybrid drive ULED method, comprising the steps of:
step 1: selecting a subframe for gamma2.2 low gray scale processing;
step 2: increasing VL1 to VLN for low gray scale selection and no brightness linearity;
and step 3: performing voltage fine adjustment through the Frame X duty, and avoiding the situation that the voltage is lower than the threshold when the low gray scale selection is performed in the step 2;
and 4, step 4: the brightness is selected.
As a still further scheme of the invention: in the step 1, one Frame is selected for gamma2.2 low gray scale processing, and the EM _ X duty of the Frame X of the Frame is independently selectable; the subframe Frame 1/2/3/4 maintains the on-time ratio of 1T/2T/4T/8T.
As a still further scheme of the invention: in step 2, the voltage output is added with VL1 to VLN for low gray scale selection without brightness linearity in addition to the original voltage outputs of V0-V18 (the voltage selection also maintains linear brightness), so that very low brightness can be selected to meet the requirement of gamma 2.2.
As a still further scheme of the invention: in step 3, the range of the lowest brightness resolution of gamma2.2 is code0 to 50, VL1 to VLN are made to meet the selection of the lowest brightness, and voltage fine adjustment is made through Frame X duty to avoid the voltage being lower than a threshold value.
As a still further scheme of the invention: in step 4, the remaining Frame 1/2/3/4 was used in combination with V0 to V18 to select the brightness of code51 to code 255.
As a still further scheme of the invention: the minimum value of N is 50.
Compared with the prior art, the invention has the beneficial effects that: compared with the traditional digital or digital-analog hybrid method, the method provided by the invention can realize the gamma2.2 picture quality without spending too much area cost; the selection of VL1 to VLN can be selected together with the independent duty ratio, so as to avoid the condition of uneven picture caused by too low voltage to the maximum.
Drawings
Fig. 1 is a voltage and sub-frame diagram of a digital-analog hybrid display drive.
FIG. 2 is a flow chart of a digital-analog hybrid drive ULED method.
Fig. 3 is a voltage and sub-frame diagram of a digital-analog hybrid drive ULED method.
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. 2 and 3, a digital-analog hybrid drive ULED method includes the following steps:
step 1: selecting a subframe for gamma2.2 low gray scale processing;
step 2: increasing VL1 to VLN for low gray scale selection and no brightness linearity;
and step 3: performing voltage fine adjustment through the Frame X duty, and avoiding the situation that the voltage is lower than the threshold when the low gray scale selection is performed in the step 2;
and 4, step 4: the brightness is selected.
In this embodiment: referring to FIGS. 2 and 3, in step 1, one of the frames is selected for gamma2.2 low gray level processing, and the EM _ X duty of the Frame X is independently selectable; the subframe Frame 1/2/3/4 maintains the on-time ratio of 1T/2T/4T/8T.
The sub-frames are turned on for different times, so that any integer multiple of 1 to 16 times the sub-Frame 1 of the initial voltages V0 to V18 can be obtained with any combination of frames 1/2/3/4, i.e., sub-frames of voltages V0 to V18.
In this embodiment: referring to fig. 2 and 3, in step 2, in addition to the original voltages V0-V18 (the voltage selection also maintains linear brightness), VL1 is added to VLN for low gray scale selection without brightness linearity, so that very low brightness can be selected to meet the requirement of gamma 2.2.
The brightness of VL1 is very low, thus satisfying the highest and lowest brightness ratio being greater than 60 k.
In this embodiment: referring to fig. 2 and 3, in step 3, the range of the highest resolution of the minimum luminance of gamma2.2 is code0 to 50, VL1 to VLN are made to satisfy the selection of the minimum luminance, and the Frame X duty is used to perform voltage fine adjustment to avoid the voltage falling below the threshold.
VL1 corresponds to code0 and VLN corresponds to code 50.
In this embodiment: referring to FIGS. 2 and 3, in step 4, the remaining Frame Frame 1/2/3/4 is used in conjunction with V0 to V18 to select the brightness of code51 to code 255.
The highest Frame 4 brightness of V18 corresponds to code255, and the lowest Frame 1 brightness of V0 corresponds to code 51.
In this embodiment: referring to fig. 2 and 3, the minimum value of N is 50.
The luminance ratio between the sub-frames Frame 4 satisfying VL1 and V18 when the value of N is 50 is more than 60 k.
The invention designs a digital simulation hybrid drive ULED method, which adds an independent frame to adjust the requirement of low gray scale, can independently adjust the duty ratio, and adds a voltage point from VL1 to VLN to meet the requirement of low gray scale.
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 (6)
1. A digital-analog hybrid drive ULED method, characterized by:
the digital-analog hybrid drive ULED method comprises the following steps:
step 1: selecting a subframe for gamma2.2 low gray scale processing;
step 2: increasing VL1 to VLN for low gray scale selection and no brightness linearity;
and step 3: performing voltage fine adjustment through the Frame X duty, and avoiding the situation that the voltage is lower than the threshold when the low gray scale selection is performed in the step 2;
and 4, step 4: the brightness is selected.
2. The method of claim 1, wherein in step 1, one of the frames is selected for gamma2.2 low grayscale processing, and the EM _ X duty of the Frame X is independently selectable; the subframe Frame 1/2/3/4 maintains the on-time ratio of 1T/2T/4T/8T.
3. The method of claim 1, wherein in step 2, voltage output is added with VL1 to VLN for low gray scale selection and no brightness linearity except for original V0-V18 (the voltage selection also maintains linear brightness), so that very low brightness can be selected to meet gamma2.2 requirement.
4. The method of claim 1, wherein in step 3, the range of highest resolution of minimum luminance of gamma2.2 is code0 to 50, VL1 to VLN are selected to satisfy the minimum luminance, and fine tuning of voltage is performed by Frame X duty to avoid the voltage falling below a threshold.
5. The method of claim 1, wherein in step 4, the Frame 1/2/3/4 is selected in combination with V0 to V18 to select the brightness of code51 to code 255.
6. A digital-to-analog hybrid drive ULED method according to claim 3 or 4, wherein the minimum value of N is 50.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111351846.6A CN113963657A (en) | 2021-11-16 | 2021-11-16 | Digital-analog hybrid drive ULED method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111351846.6A CN113963657A (en) | 2021-11-16 | 2021-11-16 | Digital-analog hybrid drive ULED method |
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| Publication Number | Publication Date |
|---|---|
| CN113963657A true CN113963657A (en) | 2022-01-21 |
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| CN202111351846.6A Pending CN113963657A (en) | 2021-11-16 | 2021-11-16 | Digital-analog hybrid drive ULED method |
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| CN (1) | CN113963657A (en) |
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2021
- 2021-11-16 CN CN202111351846.6A patent/CN113963657A/en active Pending
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