CN113963657B - Digital-analog hybrid driving ULED method - Google Patents
Digital-analog hybrid driving ULED method Download PDFInfo
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- CN113963657B CN113963657B CN202111351846.6A CN202111351846A CN113963657B CN 113963657 B CN113963657 B CN 113963657B CN 202111351846 A CN202111351846 A CN 202111351846A CN 113963657 B CN113963657 B CN 113963657B
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000012545 processing Methods 0.000 claims abstract description 8
- 238000009966 trimming Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
Classifications
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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]
-
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The invention discloses a digital-analog hybrid driving ULED method, which relates to the field of ULED driving and comprises the following steps: step 1: selecting a subframe as gamma2.2 low gray scale processing; step 2: adding VL1 to VLN to make low gray scale selection and not having brightness linearity; step 3: fine tuning is performed through the Frame X duty, and the situation that the voltage is lower than a threshold value when the step 2 is used for low gray level selection is avoided; step 4: compared with the prior art, the brightness is selected, and the beneficial effects of the invention are as follows: compared with the traditional digital or digital-analog mixture, the method provided by the invention has the advantages that the picture quality of gamma2.2 is realized, and meanwhile, the cost of too much area is not required; the VL1 to VLN are selected to match with independent duty ratio, so that the condition of uneven pictures caused by too low voltage can be avoided to the greatest extent.
Description
Technical Field
The invention relates to the field of ULED driving, in particular to a digital-analog hybrid driving ULED method.
Background
ULED is a display image quality technology processing engine developed for electronic medical display and liquid crystal display television, adopts multi-partition independent backlight control and Hiview picturesque scene engine technology, has a great improvement on the aspects of picture brightness, picture contrast, picture layering, dark field detail, color accurate restoration, picture smoothness and response speed compared with the traditional LED display, and has image quality which is represented by a plurality of subjective evaluation data and is comprehensively superior to OLED. The drive commonly used at present is a purely digital display drive and a digital-analog hybrid display drive.
If the display capability of gamma 2.2 is to be realized, the contrast between the highest brightness and the lowest brightness needs to be larger than 60k, that is, at least 16 bits of resolution is needed to basically meet the requirement, but the cost is the requirement of large-area analogy and digital, and the area cost of the chip is greatly increased.
Referring to fig. 1, the digital-analog hybrid display driving:
(1): each Frame (Frame) of the display is broken into a plurality of subframes (Frame 1/2/3/.) and each subframe is turned on uled for a time of 1T/2T/4T/8T/16T ….
(2): The voltages V0 to VN are chosen to be linear in brightness, that is to say N is 1.
(3): By using the method of the a/b two points, 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 subframes, a combination of 0 to 279 can be generated, which can meet the requirement that a typical 8-bit display system needs to select 256 display outputs.
The contrast of this approach is only 279, far from the basic display requirements of Gamma 2.2.
Such an architecture is required to achieve the basic display requirements: n=256 and 9 subframes are required, faster update speed is required, and generally panel can support more than 5 subframes, then the requirement of n=256 also increases the chip area cost greatly.
The drawbacks of purely digital display driving and digital-analog hybrid display driving are that improvements in the iled driving are needed.
Disclosure of Invention
The present invention is directed to a digital-analog hybrid driving iled method, which solves the above-mentioned problems.
In order to achieve the above purpose, the present invention provides the following technical solutions:
A digital-to-analog hybrid drive iled method comprising the steps of:
step1: selecting a subframe as gamma2.2 low gray scale processing;
step 2: adding VL1 to VLN for low gray scale selection and without brightness linear adjustment;
Step 3: performing voltage fine adjustment through the Frame X duty, and avoiding that the voltage is lower than a threshold value when the step 2 is used for low gray level selection;
Step 4: the brightness is selected.
As still further aspects of the invention: in step 1, one subframe is selected for gamma2.2 low gray scale processing, and the Frame X duty of the subframe is independently selectable; the subframe Frame 1/2/3/4 maintains an on-time ratio of 1T/2T/4T/8T.
As still further aspects of the invention: in step2, the voltage output is not limited to V0-V18 (the voltage selection also maintains the linear brightness), and VL 1-VLN is additionally added to make low gray scale selection and no brightness linear adjustment is provided, so that very low brightness can be selected to meet the requirement of gamma 2.2.
As still further aspects of the invention: in step 3, the range of the lowest brightness resolution of gamma2.2 is code 0 to 50, VL1 to VLN is selected to meet the minimum brightness, and voltage trimming is performed by Frame X duty to avoid the voltage being lower than the threshold.
As still further aspects of the invention: in step 4, the remaining subframes Frame 1/2/3/4 are collocated with V0 to V18 to select the brightness of codes 51 to 255.
As still further aspects of the invention: the N minimum is 50.
Compared with the prior art, the invention has the beneficial effects that: compared with the traditional digital or digital-analog mixture, the method provided by the invention has the advantages that the picture quality of gamma 2.2 is realized, and meanwhile, the cost of too much area is not required; the VL1 to VLN are selected to match with independent duty ratio, so that the condition of uneven pictures caused by too low voltage can be avoided to the greatest extent.
Drawings
Fig. 1 is a diagram of the voltage and sub-frame of a digital-analog hybrid display drive.
Fig. 2 is a flow chart of a digital-analog hybrid drive iled method.
Fig. 3 is a diagram of the voltage and sub-frames of a digital-analog hybrid drive iled method.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present invention are included in the protection scope of the present invention.
Referring to fig. 2 and 3, a digital-analog hybrid driving iled method comprises the steps of:
step1: selecting a subframe as gamma2.2 low gray scale processing;
step 2: adding VL1 to VLN for low gray scale selection and without brightness linear adjustment;
Step 3: performing voltage fine adjustment through the Frame X duty, and avoiding that the voltage is lower than a threshold value when the step 2 is used for low gray level selection;
Step 4: the brightness is selected.
In this embodiment: referring to fig. 2 and 3, in step 1, one subframe is selected for gamma2.2 low gray level processing, and the Frame X duty of the subframe is independently selectable; the subframe Frame 1/2/3/4 maintains an on-time ratio of 1T/2T/4T/8T.
The times at which the subframes are turned on are different, and thus have any integer multiple of 1 to 16 times the subframe Frame 1 of the initial voltages V0 to V18 that can be obtained by any combination of frames 1/2/3/4, i.e., subframes of voltages V0 to V18.
In this embodiment: referring to fig. 2 and 3, in step 2, the voltage output is increased by VL1 to VLN to make low gray level selection and not having brightness linear adjustment in addition to V0 to V18 (the voltage selection also maintains linear brightness), so that very low brightness can be selected to meet the requirement of gamma 2.2.
The brightness of VL1 is very low so that the highest and lowest brightness ratio is greater than 60k.
In this embodiment: referring to fig. 2 and 3, in step 3, the lowest luminance resolution of gamma2.2 is in the range of code 0to 50, VL1 to VLN is selected to satisfy the lowest luminance, and voltage trimming is performed by Frame X duty to avoid the voltage being lower than the threshold.
VL1 corresponds to code0 and VLN corresponds to code50.
In this embodiment: referring to fig. 2 and 3, in step 4, the remaining subframes Frame 1/2/3/4 are collocated with V0 to V18 to select the brightness of codes 51 to 255.
Frame 4 of V18 has the highest luminance corresponding to code255 and Frame 1 of V0 has the smallest corresponding to code51.
In this embodiment: referring to fig. 2 and 3, n has a minimum value of 50.
The luminance ratio between the subframes Frame 4 of VL1 and V18 can be satisfied at a value of N of 50 of more than 60k.
The invention designs a digital-analog hybrid driving ULED method, which is added with the requirement of adjusting low gray level by an independent frame, the duty ratio can be independently adjusted, and the voltage points from VL1 to VLN are added to meet the requirement of low gray level.
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 characteristics 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 disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (4)
1. A digital-to-analog hybrid drive iled method, characterized by:
The digital-analog hybrid driving ULED method comprises the following steps:
step1: selecting a subframe as gamma2.2 low gray scale processing;
step 2: adding VL1 to VLN for low gray scale selection and without brightness linear adjustment;
Step 3: performing voltage fine adjustment through the Frame X duty, and avoiding that the voltage is lower than a threshold value when the step 2 is used for low gray level selection;
step 4: selecting brightness;
In step 1, one subframe is selected for gamma2.2 low gray scale processing, and the Frame X duty of the subframe is independently selectable; the subframe Frame 1/2/3/4 maintains an on time ratio of 1T/2T/4T/8T;
In step 2, the voltage output is additionally provided with VL1 to VLN for low gray scale selection and no brightness linear adjustment except the original V0 to V18, so that very low brightness can be selected to meet the requirement of gamma 2.2.
2. The digital-analog hybrid driving ULED method according to claim 1, wherein in step 3, the lowest luminance resolution of gamma 2.2 ranges from code 0 to 50, VL1 to VLN is selected to satisfy the lowest luminance, and voltage trimming is performed by Frame X duty to avoid the voltage being lower than the threshold.
3. The digital-analog hybrid driving ULED method according to claim 1, wherein in step 4, the remaining subframes Frame 1/2/3/4 are collocated with V0 to V18 to select the brightness of codes 51 to 255.
4. The digital-analog hybrid drive iled method according to claim 1 or 2, wherein N minimum is 50.
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| CN113963657B true CN113963657B (en) | 2024-06-14 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110473493A (en) * | 2019-08-30 | 2019-11-19 | 上海中航光电子有限公司 | The driving method and display device of display panel |
| CN111179818A (en) * | 2020-02-22 | 2020-05-19 | 禹创半导体(广州)有限公司 | Micro LED display device |
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| KR101539028B1 (en) * | 2012-07-05 | 2015-07-24 | 성균관대학교산학협력단 | Field sequential display method liquid crystal display apparatus |
| CN112071261A (en) * | 2020-09-22 | 2020-12-11 | 禹创半导体(深圳)有限公司 | Micro LED pixel circuit and driving method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110473493A (en) * | 2019-08-30 | 2019-11-19 | 上海中航光电子有限公司 | The driving method and display device of display panel |
| CN111179818A (en) * | 2020-02-22 | 2020-05-19 | 禹创半导体(广州)有限公司 | Micro LED display device |
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