CN109473047B - Micro light emitting diode display panel and driving method thereof - Google Patents
Micro light emitting diode display panel and driving method thereof Download PDFInfo
- Publication number
- CN109473047B CN109473047B CN201710798946.0A CN201710798946A CN109473047B CN 109473047 B CN109473047 B CN 109473047B CN 201710798946 A CN201710798946 A CN 201710798946A CN 109473047 B CN109473047 B CN 109473047B
- Authority
- CN
- China
- Prior art keywords
- sub
- pixel
- micro
- micro light
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000005484 gravity Effects 0.000 claims description 15
- 239000003086 colorant Substances 0.000 claims description 4
- 241001270131 Agaricus moelleri Species 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- 238000001228 spectrum Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
-
- 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]
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Computer Hardware Design (AREA)
- Led Device Packages (AREA)
- Control Of El Displays (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention provides a micro light-emitting diode display panel and a driving method thereof. The plurality of sub-pixels at least comprises a first sub-pixel. The first sub-pixel comprises two micro light emitting diodes. The two micro light-emitting diodes are electrically independent and have different light-emitting wavelengths. The control element controls the input currents of the two micro light-emitting diodes based on the gray-scale value of the first sub-pixel, wherein the ratio of the input current of the micro light-emitting diode with the larger light-emitting wavelength to the input current of the micro light-emitting diode with the smaller light-emitting wavelength increases with the increase of the gray-scale value of the first sub-pixel. In addition, a driving method of the micro light emitting diode display panel is provided.
Description
Technical Field
The present invention relates to a display panel and a driving method thereof, and more particularly, to a micro light emitting diode display panel and a driving method thereof.
Background
With the development of optoelectronic technology, solid-state light sources (such as light emitting diodes) have been widely used in various fields, such as road lighting, large outdoor signs, traffic lights, and the like. Recently, a micro light emitting diode display panel has been developed, which uses micro light emitting diodes as sub-pixels in the display panel, so that each sub-pixel can be driven to emit light individually. The display panel which combines the light beams emitted by the micro light-emitting diodes capable of independently emitting light into an image is the micro light-emitting diode display panel.
In the conventional high-resolution or large-size micro led display panel, the current supply time of each data line is short, so the current density transmitted by each data line needs to be increased, and the panel is easily damaged by heat. In addition, when the micro light emitting diode is driven with a small current, the center of gravity wavelength (dominant wavelength) of the micro light emitting diode becomes smaller as the current increases. Therefore, when the gray scale is controlled by changing the current, color cast is easily generated on the image with different gray scales.
FIG. 1 is a graph of current density versus wavelength for a micro LED. Exemplified by a green micro-LED, as shown in FIG. 1, when a small current is applied (e.g., the current density is 5A/cm)2Below) the wavelength of the green micro-leds is decreased with the increase of the current, resulting in a higher gray scale (higher current density) of the green micro-ledsThe more blue the green light output by the micro led is, the more the uniformity of the wavelength of the green light cannot be maintained at different gray levels. Therefore, how to improve the color shift caused by the change of the current density is one of the problems that the researchers in this field are demanding to solve.
Disclosure of Invention
The invention provides a micro light-emitting diode display panel and a driving method thereof, which can solve the problem of color cast caused by the change of current density.
The invention relates to a micro light-emitting diode display panel which comprises a plurality of sub-pixels and a control element. The plurality of sub-pixels at least comprises a first sub-pixel. The first sub-pixel comprises two micro light emitting diodes. The two micro light-emitting diodes are electrically independent and have different light-emitting wavelengths. The control element controls the input currents of the two micro light-emitting diodes based on the gray-scale value of the first sub-pixel, wherein the ratio of the input current of the micro light-emitting diode with the larger light-emitting wavelength to the input current of the micro light-emitting diode with the smaller light-emitting wavelength increases with the increase of the gray-scale value of the first sub-pixel.
In an embodiment of the invention, the difference between the light emitting wavelengths of the two micro light emitting diodes falls within a range of 1nm to 10 nm.
In an embodiment of the invention, the control element controls the current densities of the two micro light emitting diodes to be respectively less than 3A/cm2。
In an embodiment of the invention, the control element turns on the micro light emitting diode with the smaller wavelength and turns off the micro light emitting diode with the larger light emitting wavelength when the gray-scale value of the first sub-pixel is the minimum value. The control element turns on the micro light-emitting diode with larger light-emitting wavelength and turns off the micro light-emitting diode with smaller light-emitting wavelength when the gray-scale value of the first sub-pixel is the maximum value.
In an embodiment of the invention, the first sub-pixel is a green sub-pixel, and the two micro light emitting diodes are green micro light emitting diodes.
In an embodiment of the invention, the plurality of sub-pixels further includes a second sub-pixel and a third sub-pixel. The first sub-pixel, the second sub-pixel and the third sub-pixel are sub-pixels with different colors.
In an embodiment of the invention, the first sub-pixel, the second sub-pixel and the third sub-pixel are a green sub-pixel, a red sub-pixel and a blue sub-pixel, respectively. The blue sub-pixel has only one micro light emitting diode. The red sub-pixel comprises two red micro light emitting diodes. The two red micro light-emitting diodes are electrically independent and have different light-emitting wavelengths. The control element controls the input current of the two red micro light-emitting diodes based on the gray-scale value of the red sub-pixel, wherein the ratio of the input current of the red micro light-emitting diode with the larger light-emitting wavelength to the input current of the red micro light-emitting diode with the smaller light-emitting wavelength increases with the increase of the gray-scale value of the red sub-pixel.
In an embodiment of the invention, the first sub-pixel, the second sub-pixel and the third sub-pixel are a green sub-pixel, a red sub-pixel and a blue sub-pixel, respectively. The red sub-pixel comprises two red micro light emitting diodes. The two red micro light-emitting diodes are electrically independent and have different light-emitting wavelengths. The control element controls the input current of the two red micro light-emitting diodes based on the gray-scale value of the red sub-pixel, wherein the ratio of the input current of the red micro light-emitting diode with the larger light-emitting wavelength to the input current of the red micro light-emitting diode with the smaller light-emitting wavelength increases with the increase of the gray-scale value of the red sub-pixel. The blue sub-pixel comprises two blue micro light emitting diodes. The two blue micro light-emitting diodes are electrically independent and have different light-emitting wavelengths. The control element controls the input current of the two blue micro light-emitting diodes based on the gray-scale value of the blue sub-pixel, wherein the ratio of the input current of the blue micro light-emitting diode with the larger light-emitting wavelength to the input current of the blue micro light-emitting diode with the smaller light-emitting wavelength increases with the increase of the gray-scale value of the blue sub-pixel.
The driving method of the micro light-emitting diode display panel comprises the following steps. First, a micro light emitting diode display panel is provided, which has a plurality of sub-pixels and at least one control element electrically connected to the plurality of sub-pixels, wherein the plurality of sub-pixels at least include a first sub-pixel. The first sub-pixel comprises two micro light emitting diodes. The two micro light-emitting diodes are electrically independent and have different light-emitting wavelengths. Secondly, according to the gray-scale value of the first sub-pixel, the control element respectively controls the input currents of the two micro light-emitting diodes, wherein the ratio of the input current of the micro light-emitting diode with the larger light-emitting wavelength to the input current of the micro light-emitting diode with the smaller light-emitting wavelength increases with the increase of the gray-scale value of the first sub-pixel.
In an embodiment of the invention, the input current of the micro led with a larger emission wavelength is I2, the input current of the micro led with a smaller emission wavelength is I1, and the ratio of I1 to I2 is (W2-W)/(W-W1) in accordance with I1/I2, where W is a target wavelength of the first sub-pixel, W1 is a center of gravity wavelength of the micro led with a smaller emission wavelength when the target wavelength is mixed, and W2 is a center of gravity wavelength of the micro led with a larger emission wavelength when the target wavelength is mixed.
In an embodiment of the invention, the control element controls the current densities of the two micro light emitting diodes to be respectively less than 3A/cm2。
In view of the above, in the micro led display panel and the driving method thereof of the invention, the first sub-pixel has two micro leds with different light emitting wavelengths, and the ratio of the input currents of the two micro leds is changed based on the gray scale value, so as to maintain the consistency between the center of gravity wavelength and the light intensity under different gray scales. Therefore, the micro light emitting diode display panel and the driving method thereof can improve the color cast problem caused by the change of the current density.
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
FIG. 1 is a graph of current density versus wavelength for a micro LED.
Fig. 2 is a schematic top view of a portion of a micro led display panel according to a first embodiment of the invention.
Fig. 3 is a schematic diagram of the wavelength and the light intensity of two micro light emitting diodes in the first sub-pixel of fig. 2.
Fig. 4 and 5 are partial top views of a micro led display panel according to a second embodiment and a third embodiment of the invention, respectively.
Description of the reference numerals
100. 200 and 300: micro light-emitting diode display panel
110: sub-pixel
112: first sub-pixel
112A, 112B: micro light-emitting diode
114: second sub-pixel
114A, 114B: micro light-emitting diode
116: third sub-pixel
116A, 116B: micro light-emitting diode
120: control element
130: substrate
U: display unit
W: target wavelength
W112A, W112B: wavelength of light emission
Detailed Description
Fig. 2 is a schematic top view of a portion of a micro led display panel according to a first embodiment of the invention. Referring to fig. 2, a micro led display panel 100 according to a first embodiment of the invention includes a plurality of sub-pixels 110 and a control element 120.
The plurality of sub-pixels 110 includes at least a first sub-pixel 112. The first sub-pixel 112 includes a micro light emitting diode 112A and a micro light emitting diode 112B. The micro leds 112A and the micro leds 112B may have the same size to facilitate the bonding process and the circuit design, but not limited thereto.
The micro light emitting diodes 112A and 112B are electrically independent of each other and have different light emitting wavelengths. The emission wavelength here refers to the wavelength corresponding to the maximum value of the light intensity in the spectrum of the micro light emitting diode. Fig. 3 is a schematic diagram of the wavelength and the light intensity of two micro light emitting diodes in the first sub-pixel of fig. 2. Referring to fig. 2 and fig. 3, the spectrum of the micro light emitting diode 112B partially overlaps the spectrum of the micro light emitting diode 112A, and the light emitting wavelength W112B of the micro light emitting diode 112B is greater than the light emitting wavelength W112A of the micro light emitting diode 112A. In one embodiment, the difference between the light emitting wavelength W112A of the micro LED 112A and the light emitting wavelength W112B of the micro LED 112B falls within the range of 1nm to 10nm, and preferably falls within the range of 3nm to 5 nm.
The control element 120 is electrically connected to the micro light emitting diodes 112A and 112B in the first sub-pixel 112, so as to control the input currents of the micro light emitting diodes 112A and 112B based on the gray-scale value of the first sub-pixel 112. In the first embodiment, the control element 120 is disposed at one side of the plurality of sub-pixels 110, and is individually connected to control the input current of each sub-pixel 110 through a conducting wire (not shown). In other embodiments, the plurality of control elements 120 may be respectively disposed in the respective sub-pixels 110.
In the first sub-pixel 112, the ratio of the input current of the micro light emitting diode 112B having a larger light emitting wavelength to the input current of the micro light emitting diode 112A having a smaller light emitting wavelength increases with the increase of the gray scale value of the first sub-pixel 112.
Specifically, the driving manner of the sub-pixels of the micro led display panel 100 satisfies formula 1:
the
Wherein Δ W2 ═ W2-W, ═ W1 ═ W-W1, and Δ W ═ W2-W1.
The representative meanings of the symbols in the above relational expression are as follows:
w: target dominant wavelength (λ)d)；
W1 and W2: mixing the dominant wavelengths of the micro light emitting diodes 112A and 112B to obtain the dominant wavelengths (λ, λ) of the micro light emitting diodes 112A and 112Bd)；
I1 and I2: mixing the input currents of the micro light-emitting diode 112A and the micro light-emitting diode 112B at the target dominant wavelength; and
i: the current required by the first sub-pixel 112 at the target gray level, wherein I1+ I2 is equal to or close to I.
Furthermore, the ratio of I1 to I2 corresponds to: I1/I2 ═ W2-W)/(W-W1.
According to fig. 1, the wavelength shifts to a small wavelength as the current density inputted to the micro light emitting diode increases. That is, the higher the gray scale value to be expressed, the lower the wavelength is. Therefore, in the first sub-pixel 112 of the present embodiment, the current density of the micro light emitting diode 112A with smaller light emitting wavelength decreases with the increase of the gray scale value, and the current density of the micro light emitting diode 112B with larger light emitting wavelength increases with the increase of the gray scale value. At the time of low gray scale, the center of gravity wavelength of the light beam output from the first sub-pixel 112 is mainly dominated by the micro-light emitting diode 112A having a smaller light emitting wavelength. As the gray-scale value increases, the center of gravity wavelength of the light beam output from the first subpixel 112 may be increased by increasing the current density of the micro light emitting diode 112B having a larger emission wavelength. At a high gray level, the center of gravity wavelength of the light beam outputted from the first sub-pixel 112 is mainly determined by the micro led 112B with a larger light emitting wavelength, and the center of gravity wavelength of the light beam outputted from the first sub-pixel 112 can be modulated by the micro led 112A with a smaller light emitting wavelength. In one example, the control element 120 may turn on the micro led 112A with smaller light emitting wavelength and turn off the micro led 112B with larger light emitting wavelength when the gray scale value of the first sub-pixel 112 is the minimum (darkest). In addition, the control element 120 may turn on the micro led 112B with a larger emission wavelength and turn off the micro led 112A with a smaller emission wavelength when the gray-scale value of the first sub-pixel 112 is the maximum value (brightest).
In the first sub-pixel 112, the input current ratio of the micro light emitting diodes with different light emitting wavelengths is changed according to the gray scale value, so that the size of the center of gravity wavelength can be controlled, and the current density required by each micro light emitting diode can be reduced. Since the shift amount of the center of gravity wavelength is smaller as the change amount of the current density is smaller (as shown in FIG. 1), the light is emitted in a plurality of micro-sized regionsThe pole tube replaces a single micro light-emitting diode to help reduce the color cast of each micro light-emitting diode. Therefore, the consistency of the center of gravity wavelength and the light intensity can be maintained under different gray scales. In one embodiment, the control device 120 controls the current density passing through the micro light emitting diode 112A and the micro light emitting diode 112B to be less than 3A/cm2The problem of color cast can be obviously improved.
In the micro led display panel 100, the plurality of sub-pixels 110 may further include a second sub-pixel 114 and a third sub-pixel 116. The first sub-pixel 112, the second sub-pixel 114 and the third sub-pixel 116 are sub-pixels with different colors (e.g., a red sub-pixel, a green sub-pixel and a blue sub-pixel), so that the micro led display panel 100 can perform full color display.
The first sub-pixel 112, the second sub-pixel 114 and the third sub-pixel 116 together form a display unit U. The micro led display panel 100 may include a plurality of display units U arranged in an array to perform a surface display (fig. 2 only schematically shows four display units U). In addition, although fig. 2 shows that four display units U are electrically connected to one control element 120, that is, the four display units U share one control element 120, but not limited thereto. In another embodiment, one display unit U may be connected to one control element 120.
The control element 120 is used to control the light emitting state (light emitting, non-light emitting or light emitting intensity) of more than one display unit U. For example, the control device 120 may be a circuit chip, and the control device 120 and the micro light emitting diodes in the display unit U may be commonly bonded on a substrate 130. The substrate 130 may be a Printed Circuit Board (PCB), a Flexible Printed Circuit Board (FPCB), a glass carrier with a wire, or a ceramic substrate with a wire.
In this embodiment, the number of the micro light emitting diodes (such as the micro light emitting diode 114A) of the second sub-pixel 114 is only one, and the number of the micro light emitting diodes (such as the micro light emitting diode 116A) of the third sub-pixel 116 is only one. The control element 120 is further electrically connected to the micro light emitting diode 114A in the second sub-pixel 114 and the micro light emitting diode 116A in the third sub-pixel 116 to control the light emitting states of the micro light emitting diode 114A and the micro light emitting diode 116A.
For example, the first sub-pixel 112, the second sub-pixel 114 and the third sub-pixel 116 can be a green sub-pixel, a red sub-pixel and a blue sub-pixel, respectively, that is, the micro light emitting diode 112A and the micro light emitting diode 112B are green micro light emitting diodes, the micro light emitting diode 114A is a red micro light emitting diode, and the micro light emitting diode 116A is a blue micro light emitting diode. Since the human eye is most sensitive to green light (appears brighter at the same brightness) among red light, green light, and blue light, the color shift problem (blue shift phenomenon) of the green micro-led is more significant. In the present embodiment, the green micro leds with two different light emitting wavelengths are disposed in the green sub-pixel, and the ratio of the input currents of the two green micro leds is changed based on the gray scale value, so as to maintain the consistency between the gravity center wavelength and the light intensity of the green light at different gray scales, and thus the micro led display panel 100 can have good display quality. In another embodiment, the first sub-pixel 112, the second sub-pixel 114, and the third sub-pixel 116 may be a blue sub-pixel, a green sub-pixel, and a red sub-pixel, or a red sub-pixel, a green sub-pixel, and a blue sub-pixel, respectively.
Although the first embodiment discloses the above method for improving color shift (two micro light emitting diodes with different light emitting wavelengths are disposed in one sub-pixel, and the ratio of the input currents of the two micro light emitting diodes changes based on the gray scale value) only applied to one sub-pixel (the first sub-pixel 112) of one color, the invention is not limited thereto. In another embodiment, the method for improving color shift can also be applied to at least one of the second sub-pixel 114 and the third sub-pixel 116.
Fig. 4 and 5 are partial top views of a micro led display panel according to a second embodiment and a third embodiment of the invention, respectively, wherein fig. 4 and 5 respectively omit a substrate and only schematically show one display unit U. Referring to fig. 4, the micro led display panel 200 of fig. 4 is similar to the micro led display panel 100 of fig. 2, wherein the same elements are denoted by the same reference numerals, and therefore, the description thereof will not be repeated. The main difference between the two is that the micro led display panel 200 further applies the above method for improving color shift to the second sub-pixel 114.
Specifically, in the micro led display panel 200, the second sub-pixel 114 (e.g., the red sub-pixel) includes a micro led 114A and a micro led 114B. The micro leds 114A and the micro leds 114B may have the same size to facilitate the bonding process and the circuit design, but not limited thereto.
In the present embodiment, the micro light emitting diodes 114A and 114B are red micro light emitting diodes. The two red micro light-emitting diodes are electrically independent and have different light-emitting wavelengths. The control element 120 is electrically connected to the micro light emitting diodes 114A and 114B to control the input currents of the two red micro light emitting diodes (the micro light emitting diodes 114A and 114B) based on the gray-scale value of the second sub-pixel 114 (the red sub-pixel), wherein the ratio of the input current of the red micro light emitting diode with a larger light emitting wavelength to the input current of the red micro light emitting diode with a smaller light emitting wavelength increases with the increase of the gray-scale value of the red sub-pixel.
Referring to fig. 5, the micro led display panel 300 of fig. 5 is similar to the micro led display panel 200 of fig. 4, wherein the same elements are denoted by the same reference numerals, and therefore, the description thereof will not be repeated. The main difference between the two is that the micro led display panel 300 further applies the above method for improving color shift to the third sub-pixel 116.
Specifically, in the micro led display panel 300, the third sub-pixel 116 (e.g., blue sub-pixel) includes a micro led 116A and a micro led 116B. The micro light emitting diodes 116A and 116B may have the same size to facilitate the bonding process and the circuit design, but not limited thereto.
In the present embodiment, the micro light emitting diodes 116A and 116B are blue micro light emitting diodes. The two blue micro light-emitting diodes are electrically independent and have different light-emitting wavelengths. The control element 120 is electrically connected to the micro light emitting diodes 116A and 116B to control the input currents of the two blue micro light emitting diodes (the micro light emitting diodes 116A and 116B) based on the gray-scale value of the third sub-pixel 116 (the blue sub-pixel), wherein the ratio of the input current of the blue micro light emitting diode with a larger light emitting wavelength to the input current of the blue micro light emitting diode with a smaller light emitting wavelength increases with the increase of the gray-scale value of the blue sub-pixel.
In summary, in the micro led display panel of the invention, the first sub-pixel has two micro leds with different light emitting wavelengths, and the ratio of the input currents of the two micro leds is changed based on the gray scale value, so as to maintain the consistency between the gravity center wavelength and the light intensity under different gray scales. Therefore, the micro light emitting diode display panel can improve the color cast problem caused by the change of the current density. In an embodiment, the method for improving color shift can also be applied to at least one of the second sub-pixel and the third sub-pixel. In addition, in each display unit, the arrangement of the sub-pixels with different colors, the size, arrangement and number of the micro-leds in each sub-pixel can be changed according to the requirement, and are not limited to those shown in fig. 2, 4 and 5.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (11)
1. A micro light emitting diode display panel, comprising:
the display device comprises a plurality of sub-pixels, a plurality of driving circuits and a plurality of driving circuits, wherein the plurality of sub-pixels at least comprise a first sub-pixel, the first sub-pixel comprises two micro light-emitting diodes, and the two micro light-emitting diodes are electrically independent and have different light-emitting wavelengths; and
and the control element controls the input currents of the two micro light-emitting diodes on the basis of the gray-scale value of the first sub-pixel, wherein the ratio of the input current of the micro light-emitting diode with the larger light-emitting wavelength to the input current of the micro light-emitting diode with the smaller light-emitting wavelength increases along with the increase of the gray-scale value of the first sub-pixel.
2. The micro light-emitting diode display panel of claim 1, wherein the difference of the light-emitting wavelengths of the two micro light-emitting diodes falls within a range of 1nm to 10 nm.
3. The micro light-emitting diode display panel of claim 1, wherein the control element controls the current density flowing into the two micro light-emitting diodes to be less than 3A/cm respectively2。
4. The micro led display panel of claim 1, wherein the control element turns on the micro leds with smaller emission wavelengths and turns off the micro leds with larger emission wavelengths when the gray-scale value of the first sub-pixel is a minimum value, and the control element turns on the micro leds with larger emission wavelengths and turns off the micro leds with smaller emission wavelengths when the gray-scale value of the first sub-pixel is a maximum value.
5. The micro light-emitting diode display panel of claim 1, wherein the first sub-pixel is a green sub-pixel and the two micro light-emitting diodes are green micro light-emitting diodes.
6. The micro light-emitting diode display panel of claim 1, wherein the plurality of sub-pixels further comprises a second sub-pixel and a third sub-pixel, and the first sub-pixel, the second sub-pixel and the third sub-pixel are sub-pixels of different colors.
7. The micro LED display panel of claim 6, wherein the first sub-pixel, the second sub-pixel and the third sub-pixel are a green sub-pixel, a red sub-pixel and a blue sub-pixel respectively, the blue sub-pixel has only one micro light-emitting diode, the red sub-pixel comprises two red micro light-emitting diodes, the two red micro light-emitting diodes are electrically independent and have different light-emitting wavelengths, the control element controls the input current of the two red micro light-emitting diodes based on the gray-scale value of the red sub-pixel, the ratio of the input current of the red micro light-emitting diode with the larger light-emitting wavelength to the input current of the red micro light-emitting diode with the smaller light-emitting wavelength increases with the increase of the gray-scale value of the red sub-pixel.
8. The micro LED display panel of claim 6, wherein the first sub-pixel, the second sub-pixel and the third sub-pixel are a green sub-pixel, a red sub-pixel and a blue sub-pixel, respectively, the red sub-pixel comprises two red micro LEDs, the two red micro LEDs are electrically independent of each other and have different light emitting wavelengths, the control element controls the input currents of the two red micro LEDs based on the gray scale value of the red sub-pixel, wherein the ratio of the input current of the red micro LED with a larger light emitting wavelength to the input current of the red micro LED with a smaller light emitting wavelength increases with the increase of the gray scale value of the red sub-pixel, and the blue sub-pixel comprises two blue micro LEDs, the control element controls the input currents of the two blue micro light-emitting diodes based on the gray-scale value of the blue sub-pixel, wherein the ratio of the input current of the blue micro light-emitting diode with the larger light-emitting wavelength to the input current of the blue micro light-emitting diode with the smaller light-emitting wavelength increases with the increase of the gray-scale value of the blue sub-pixel.
9. A driving method of a micro light emitting diode display panel is characterized by comprising the following steps:
providing a micro light emitting diode display panel, which is provided with a plurality of sub-pixels and at least one control element electrically connected with the sub-pixels, wherein the sub-pixels at least comprise a first sub-pixel, the first sub-pixel comprises two micro light emitting diodes, and the two micro light emitting diodes are electrically independent and have different light emitting wavelengths; and
according to the gray-scale value of the first sub-pixel, the control element respectively controls the input currents of the two micro light-emitting diodes, wherein the ratio of the input current of the micro light-emitting diode with the larger light-emitting wavelength to the input current of the micro light-emitting diode with the smaller light-emitting wavelength increases with the increase of the gray-scale value of the first sub-pixel.
10. The method as claimed in claim 9, wherein the input current of the micro led with a larger wavelength is I2, the input current of the micro led with a smaller wavelength is I1, and the ratio of I1 to I2 is as follows:
I1/I2＝(W2-W)/(W-W1)；
wherein W is a target wavelength of the first sub-pixel, W1 is a center of gravity wavelength of the micro light emitting diode having a smaller emission wavelength when the target wavelength is mixed, and W2 is a center of gravity wavelength of the micro light emitting diode having a larger emission wavelength when the target wavelength is mixed.
11. The method as claimed in claim 9, wherein the control element controls the current density flowing into the two micro light emitting diodes to be less than 3A/cm2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710798946.0A CN109473047B (en) | 2017-09-07 | 2017-09-07 | Micro light emitting diode display panel and driving method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710798946.0A CN109473047B (en) | 2017-09-07 | 2017-09-07 | Micro light emitting diode display panel and driving method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109473047A CN109473047A (en) | 2019-03-15 |
| CN109473047B true CN109473047B (en) | 2021-03-30 |
Family
ID=65657677
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710798946.0A Active CN109473047B (en) | 2017-09-07 | 2017-09-07 | Micro light emitting diode display panel and driving method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109473047B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110120190B (en) * | 2019-04-10 | 2021-12-21 | 深圳康佳电子科技有限公司 | Micro LED display panel and control method thereof |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100426938C (en) * | 2005-07-07 | 2008-10-15 | 友达光电股份有限公司 | Method and display device for improving series type organic electro-luminescence element color shift |
| JP2008225179A (en) * | 2007-03-14 | 2008-09-25 | Sony Corp | Display device, driving method of the display device, and electronic apparatus |
| CN101737641B (en) * | 2008-11-11 | 2013-07-31 | 群创光电股份有限公司 | Light-emitting diode light source module and application thereof |
| DE102008064149A1 (en) * | 2008-12-19 | 2010-07-01 | Osram Opto Semiconductors Gmbh | Optoelectronic device |
| CN101866087B (en) * | 2009-04-14 | 2012-03-21 | 群康科技(深圳)有限公司 | Sub-pixel structure and liquid crystal display panel |
| US8890437B2 (en) * | 2012-12-12 | 2014-11-18 | Ledzworld Sdn Bhd | Method and system of automatically adjusting light intensity of a lighting fixture having multiple emitters |
| TWI537919B (en) * | 2014-05-23 | 2016-06-11 | 友達光電股份有限公司 | Display and sub-pixel driving method thereof |
| CN104936353B (en) * | 2015-06-26 | 2017-06-06 | 复旦大学 | It is a kind of to realize the method that different spectrum are exported by changing LED peak wavelengths |
| CN106531771A (en) * | 2016-12-27 | 2017-03-22 | 上海天马有机发光显示技术有限公司 | Display substrate, display panel, display device and pixel driving method |
| CN106876408B (en) * | 2017-02-21 | 2019-09-17 | 深圳市华星光电技术有限公司 | Micro- LED display panel and production method |
-
2017
- 2017-09-07 CN CN201710798946.0A patent/CN109473047B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109473047A (en) | 2019-03-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TWI624821B (en) | Micro light emitting diode display panel and driving method thereof | |
| CN101268554A (en) | Variable color light emitting device and method for controlling the same | |
| US8552964B2 (en) | Backlight assembly and method of driving the same | |
| CN109389947B (en) | Display device | |
| KR20050008426A (en) | Light-emitting semiconductor device packaged with light-emitting diode and current-driving integrated circuit | |
| US11716800B2 (en) | Micro-LED amplitude control system | |
| US10629573B2 (en) | Display device with different size subpixels and operating method for such a display device | |
| JP2007027421A (en) | Led package and lighting device | |
| TWI480660B (en) | Display device | |
| CN102537733B (en) | Light emitting module and method of manufacturing same | |
| US20080297702A1 (en) | Light Emitting Diode Package and Driving Method Thereof | |
| CN109616039A (en) | Display panel and its emission control circuit, driving method, display device | |
| CN114299868B (en) | Display substrate, control method thereof and display device | |
| US8093827B2 (en) | Light source module, light source assembly having the same and display device having the light source module | |
| CN109473047B (en) | Micro light emitting diode display panel and driving method thereof | |
| CN113362759A (en) | Miniature light-emitting diode display panel and display device | |
| CN113410262B (en) | Micro light-emitting diode display panel | |
| JP7459201B2 (en) | Illumination and display devices | |
| US11289012B2 (en) | Micro light emitting diode display panel and driving method thereof | |
| US20220172673A1 (en) | Micro light-emitting diode display panel | |
| WO2011086176A1 (en) | Illumination device | |
| CN111999938A (en) | Backlight module and liquid crystal display thereof | |
| CN112331692B (en) | Light-emitting device with semiconductor light-emitting diode chip | |
| US11869418B1 (en) | Micro light emitting diode display panel | |
| CN108267916B (en) | Laser light source and display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240515 Address after: 8th Floor, No.13 Kezhong Road, Zhunan Town, Miaoli County, Hsinchu Science Park, Taiwan, China, China Patentee after: PlayNitride Inc. Country or region after: TaiWan, China Address before: Grand Cayman Island, Grand Exhibition Hall Commercial Center, Olander Road, 802 West Bay Road, PO Box 32052, KY1-1208, Cayman Islands Patentee before: PlayNitride Inc. Country or region before: Cayman Islands |