Display device, light-emitting module thereof and driving method

Abstract

The invention discloses a display device, a light-emitting module thereof and a driving method. The light emitting module comprises N * M pixel modules. And the N * M pixel modules are arranged in a two-dimensional array. Each pixel module comprises a plurality of light-emitting diodes and a driving circuit, the light-emitting diodes form a plurality of pixels in the corresponding pixel module and are controlled by the driving circuit, each driving circuit is used for applying a driving current to the light-emitting diodes in the corresponding pixel module, and N and M are positive integers greater than or equal to 2. In one cycle, the duty ratio of a working interval of each driving current is 1 / J, and in the working interval, the driving current is J times of the average driving current.

Description

Technical Field

[0001] This invention relates to a display device, its light-emitting module, and a driving method thereof. Background Technology

[0002] A light-emitting module comprises numerous pixels arranged in an array. The smaller the pixel pitch, the lower the driving current density, and vice versa. Furthermore, different types of light-emitting diodes (LEDs) possess different characteristics. For example, for red LEDs, a higher driving current results in higher luminous efficiency, but for green / blue LEDs, a higher driving current leads to lower luminous efficiency. Therefore, achieving excellent luminous efficiency while considering the various characteristics of LEDs is one of the directions that manufacturers in this field are striving towards. Summary of the Invention

[0003] The present invention relates to a display device, its light-emitting module and driving method, which can improve the aforementioned existing problems.

[0004] One embodiment of the present invention provides a light-emitting module. The light-emitting module includes N×M pixel modules. The N×M pixel modules are arranged in a two-dimensional array, wherein each pixel module includes multiple light-emitting diodes and a driving circuit. These light-emitting diodes constitute multiple pixels in their corresponding pixel modules and are controlled by the driving circuit. Each driving circuit applies a driving current to the light-emitting diodes in its corresponding pixel module, and N and M are positive integers greater than or equal to 2. In one cycle, the duty cycle of a working interval of each driving current is 1 / J, and in the working interval, the driving current is J times an average driving current, where J is a positive integer equal to or greater than 2.

[0005] Another embodiment of the present invention provides a display device. The display device includes a light-emitting module and a timing controller. The light-emitting module includes N×M pixel modules. The N×M pixel modules are arranged in a two-dimensional array, wherein each pixel module includes multiple light-emitting diodes and a driving circuit. These light-emitting diodes constitute multiple pixels in their corresponding pixel modules and are controlled by the driving circuit. Each driving circuit applies a driving current to the light-emitting diodes in its corresponding pixel module, and N and M are positive integers greater than or equal to 2. The timing controller generates a timing signal and a data signal to drive one of the pixel modules. In one cycle, the duty cycle of a working interval of each driving current is 1 / J, and in the working interval, the driving current is J times an average driving current, where J is a positive integer equal to or greater than 2.

[0006] Another embodiment of the present invention provides a driving method for a display device. The driving method includes the following steps: a timing controller generates a timing signal and a data signal to drive a driven entity of an N×M pixel module, wherein each pixel module includes a plurality of light-emitting diodes and a driving circuit, the light-emitting diodes constitute a plurality of pixels in the corresponding pixel module and are controlled by the driving circuit, and N and M are positive integers greater than or equal to 2; and the driving circuit of the driven entity applies a driving current to the light-emitting diodes in the corresponding pixel module, wherein in one cycle, the duty cycle of a working interval of the driving current is 1 / J, and in the working interval, the driving current is J times an average driving current, where J is a positive integer equal to or greater than 2.

[0007] To provide a better understanding of the above and other aspects of the present invention, specific embodiments are described below in conjunction with the accompanying drawings: Attached Figure Description

[0008] Figure 1A and Figure 1B This is a functional block diagram of a display device according to an embodiment of the present invention;

[0009] Figure 2 yes Figure 1A One pixel module P n×m A schematic diagram;

[0010] Figure 3 yes Figure 2 The driving current I D A graph showing the relationship between time and other parameters;

[0011] Figure 4 This is a pixel module P according to another embodiment of the present invention. n×m A sectional view;

[0012] Figure 5 The pixel module P in other embodiments of the present invention n×m A schematic diagram.

[0013] Symbol explanation:

[0014] 10: Processor

[0015] 100: Display device

[0016] 110: Light-emitting module

[0017] 111R, 111G, 111B: Light Emitting Diode

[0018] 1112R: Red Wavelength Conversion Layer

[0019] 1112G: Green Wavelength Conversion Layer

[0020] 111P: pixels

[0021] 112: Drive circuit

[0022] 113: Light-shielding layer

[0023] 114:Substrate

[0024] 115: Package

[0025] 116: Translucent layer

[0026] 120: Timing Controller

[0027] C1~C N Timing signals

[0028] D1~D M Data signal

[0029] I D Drive current

[0030] I av Average drive current

[0031] L1: First row

[0032] L2: Second row

[0033] L3: Third row

[0034] P 1×1 ~P n×m ,P n×m ~P N×M Pixel module

[0035] S1: Low voltage differential signal

[0036] W1: First signal line

[0037] W2: Second signal line

[0038] W C Timing signal lines

[0039] W D Data signal line Detailed Implementation

[0040] Please refer to Figures 1A to 3 , Figure 1A and Figure 1B A functional block diagram of a display device 100 according to an embodiment of the present invention is shown. Figure 2 Draw Figure 1A One pixel module P n×m The diagram, and Figure 3 Draw Figure 2 The driving current I D A graph showing the relationship between time and other factors.

[0041] like Figure 1A and Figure 1B As shown, the display device 100 includes a light-emitting module 110 and a timing controller (T-CON) 120. The light-emitting module 110 includes N×M pixel modules P n×m Arranged into a two-dimensional array, where N and M are positive integers greater than or equal to 2, and n is a positive integer between 1 and N, and m is a positive integer between 1 and M. Each pixel module P n×m It includes multiple pixels. In some embodiments, each pixel includes three sub-pixels that emit different colors of light, such as red, green, and blue light respectively. Furthermore, the sub-pixels contain light-emitting diodes (LEDs). In some embodiments, such as... Figure 2 As shown, a pixel module P n×m The system includes nine pixels 111P and a driving circuit 112. Each pixel 111P may include three light-emitting diodes 111a, 111b, and 111c electrically connected to the driving circuit 112. In some embodiments, each pixel 111P may include four or more sub-pixels, meaning each pixel 111P may include four or more light-emitting diodes. For example, a pixel 111P may include sub-pixels representing four colors of light: red, green, blue, and cyan; or a pixel 111P may include sub-pixels representing four colors of light: red, green, blue, and yellow; or a pixel 111P may include sub-pixels representing four colors of light: red, green, blue, and white. However, this is not intended to limit the embodiments of the present invention.

[0042] In some embodiments, a red sub-pixel can be implemented by exciting a red wavelength conversion material using, for example, a red light-emitting diode, a UV light-emitting diode, or a blue light-emitting diode; a green sub-pixel can be implemented by exciting a green wavelength conversion material using, for example, a green light-emitting diode, a UV light-emitting diode, or a blue light-emitting diode; a blue sub-pixel can be implemented by exciting a blue wavelength conversion material using, for example, a blue light-emitting diode, a UV light-emitting diode, or a blue light-emitting diode; a cyan sub-pixel can be implemented by exciting a blue-green wavelength conversion material using, for example, a UV light-emitting diode, or a blue light-emitting diode; and a yellow sub-pixel can be implemented by exciting a yellow wavelength conversion material using, for example, a UV light-emitting diode, or a blue light-emitting diode.

[0043] As shown in Figure 1 and Figure 2 As shown, these light-emitting diodes 111a, 111b, and 111c correspond to the pixel module P. n×m The system comprises multiple pixels 111P and is controlled by a driving circuit 112, with each driving circuit 112 applying a driving current I. D To the corresponding pixel module P n×mThese are the light-emitting diodes 111a, 111b, and 111c. The timing controller 120 is used to generate timing signals C1 to C2. N and data signals D1~D M Drive these pixel modules P n×m One of them. For example... Figure 3 As shown, during one period T, the driving current I... D The duty cycle of the operating range (e.g., the T / J range) is 1 / J, and within one operating range, the driving current I is... D An average drive current I av J times (i.e., I) av ×J). Thus, the driving current I of the driving diode. D Increasing the efficiency by a factor of J can improve the luminous efficiency of certain light-emitting diodes (e.g., red light-emitting diodes).

[0044] Furthermore, J is, for example, a positive integer equal to or greater than 2. The larger the value of J, the greater the driving current I. D The higher the duty cycle, the better. Because the duty cycle of this embodiment is less than 1 (e.g., 1 / J), even within the operating range, the drive current I... D Increasing the driving current by a factor of J, the average value of the driving current over the same period T is still the same as the average driving current I. av The same, regardless of the drive current I D The increase in power consumption results in additional power consumption.

[0045] In a control group, the light-emitting module 110 includes multiple pixel modules P n×m And each pixel module P n×m It includes a driving circuit 112 and a pixel 111P. Each pixel module P n×m The current that the driving circuit 112 drives to the pixel 111P is the aforementioned "average driving current I". av "(Average drive current I)" av Drawn as an example using dashed lines Figure 3 ).Depend on Figure 3 It can be seen that the average driving current I of the control group av The duty cycle is 100%, and its value is less than the drive current I. D .

[0046] like Figure 2 As shown, each pixel module P n×mThe three light-emitting diodes 111a, 111b, and 111c constitute a pixel 111P, and these three light-emitting diodes 111a, 111b, and 111c emit red light, green light, and blue light, respectively. Further, for example, at least one of these pixels 111P may each include three light-emitting diodes 111a, 111b, and 111c, which are, for example, a red diode, a green diode, and a blue diode, respectively; however, this is not intended to limit the embodiments of the present invention.

[0047] In one embodiment, at least one of the light-emitting diodes 111a, 111b, and 111c is, for example, a mini LED or a micro LED. For instance, at least one of the pixels 111P each includes a red mini LED, a green mini LED, and a blue mini LED. Alternatively, at least one of the pixels 111P includes a red micro LED, a green micro LED, and a blue micro LED.

[0048] like Figure 1A and Figure 1B As shown, N×M pixel modules P n×m The pixel modules are arranged in M ​​rows along the X-axis and N columns along the Y-axis. These pixel modules P arranged along the X-axis... n×m These driving circuits 112 are electrically connected to adjacent units, for example, in series via a first signal line W1, while these pixel modules P are arranged along the Y-axis. n×m These drive circuits 112 are electrically connected to each other, for example, in series with a second signal line W2.

[0049] like Figure 2 As shown, in a pixel module P n×m In this embodiment, these pixels 111P can be arranged into a G×K array, where G and K are positive integers greater than or equal to 1. The values ​​of G and K can be the same or different, but the product of G and K (G×K) is equal to or greater than 2. In this embodiment, G and K are each 3, resulting in a total of 9 pixels. In a pixel module P... n×m In this embodiment, G×K pixels 111P are arranged in K rows along the X-axis and in G columns along the Y-axis. The total number of pixels 111P in the light-emitting module 110 is, for example, ((N×G)×(M×K)).

[0050] like Figure 1A and Figure 1B As shown, the display device 100 also includes several timing signal lines W C and several data signal lines W D Timing signal line W C Connect the timing controller 120 and the light-emitting module 110, and use it to transmit timing signals C1 to C2. NAnd the data signal line W D Connect the timing controller 120 and the light-emitting module 110, and use it to transmit data signals D1 to D2. M In this embodiment, the timing signal line W C The number is, for example, N lines, while the data signal lines are W. D The number is, for example, M. A row of pixel blocks P arranged along the X-axis. n×m With a timing signal line W C A row of pixel modules P, connected to the timing controller 120 and arranged along the Y-axis. n×m With a data signal line W D Connected to timing controller 120. More specifically, the first row of M pixel modules P 1×1 ~P 1×M Receive from timing signal line W C The timing signal C1, the M pixel modules P in the second row 2×1 ~P 2×M Receive from timing signal line W C The timing signal C2, and so on, will not be elaborated further. More specifically, the first straight-line N pixel module P... 1×1 ~P N×1 Receive data from data signal line W D Data signal D1, the second row of N pixel modules P 1×2 ~P N×2 Receive data from data signal line W D The data signal D2, and so on, will not be elaborated further.

[0051] In the aforementioned control group, taking the light-emitting module 110 as containing ((N×G)×(M×K)) pixels 111P, the light-emitting module 110 requires (N×G) timing signal lines W. C and (M×K) data signal lines W D Therefore, the higher the resolution of an LED display, the more pixels there are per unit area, and the more timing signal lines and data signal lines are required, resulting in a higher number of timing signal lines W per unit area on the circuit board. C With data signal line W D The line density will also increase, which will increase the complexity of circuit fabrication. Conversely, in this embodiment, taking the light-emitting module 110 as also containing ((N×G)×(M×K)) pixels 111P, since the multiple pixels 111P of this embodiment can be configured in one pixel module P... n×m In, such as Figure 1B and Figure 2 One pixel module contains nine pixels, thus reducing the number of timing signal lines W. C and data signal line W DThe number of pixels simplifies the circuitry. (G×K) pixels are configured in a pixel module P. n×m Compared to the control group, the light-emitting module 110 of this embodiment can reduce the number of timing signal lines by (N×GN) W. C Furthermore, it can reduce the number of data signal lines by (M×KM) W. D In other words, a single pixel module P n×m The more pixels (111P) there are (the larger the values ​​of G and / or K), the more timing signal lines and data signal lines the display device reduces.

[0052] In the aforementioned control group, the light-emitting module 110 includes multiple pixel modules P n×m Each pixel module P n×m It includes a driving circuit 112 and a single pixel 111P. In the control group, for (G×K) pixels 111P arranged in a G×K array, (G+K) signal lines (K data signal lines arranged along the X-axis and G timing signal lines arranged along the Y-axis) are required to drive (G×K) pixels 111P. However, in the light-emitting module 110 of this embodiment, for G×K pixels 111P also arranged in a G×K array (which are configured in a pixel module P) n×m In the case of a pixel module P, only two signal lines are needed (one first signal line W1 extending along the X-axis and one second signal line W2 extending along the Y-axis). n×m The (G×K) pixels in the 111P.

[0053] Furthermore, in the aforementioned control group, a (G×K) pixel array 111P (i.e., a (G×K) pixel module P) was used. n×m For example, G or K driving circuits 112 are needed to drive these G×K pixels 111P. However, in the light-emitting module 110 of this embodiment, (G×K) pixels 111P arranged in a G×K array (i.e., one pixel module P) are used. n×m For example, only one driving circuit 112 is needed to drive (G×K) pixels 111P. In summary, in a pixel module P... n×m For driving G×K pixels 111P, the number of driving circuits required by the light-emitting module 110 in this embodiment of the invention is less than that of the control group; for example, it can reduce the number of driving circuits by up to (G-1) or (K-1) driving circuits. In one embodiment, the number of driving circuits 112 of the light-emitting module 110 can be equal to that of the pixel module P. n×m The number is N×M.

[0054] In a pixel module P n×mIn this process, these pixels 111P can be divided into J pixel blocks, and the driving circuit 112 can alternately drive current I. D Driving J pixel blocks (time-division driving), meaning each of the J blocks is driven by a current I at different times. D drive.

[0055] For example, such as Figure 2 As shown, these pixels 111P can be divided into three pixel blocks, for example, into a first row L1, a second row L2, and a third row L3. The driving circuit 112 can alternately drive current I. D The three pixels 111P of the first row L1, the three pixels 111P of the second row L2, and the three pixels 111P of the third row L3 are driven by a driving current I at different times. D Drive. Compared to the average drive current I av The driving current I drives these pixels 111P in each row. D Ratio of average drive current I av The driving current IA is increased by a factor of J, which can improve the luminous efficiency of certain light-emitting diodes (e.g., red light-emitting diodes) in each row. Therefore, in this embodiment, since the pixel 111P is divided into 3 pixel blocks, the driving current IA for driving these pixels 111P in each row is increased by a factor of J. D Ratio of average drive current I av Three times larger.

[0056] like Figure 1A and Figure 1B As shown, the processor 10 is configured externally to the display device 100, such as in the host computer. In another embodiment, the processor 10 may also be configured within the display device 100. The processor 10 is electrically connected to the timing controller 120. The processor 10 can send a Low-Voltage Differential Signaling (LVDS) signal S1 to the timing controller 120 via a Serial Peripheral Interface Bus (SPI), and the timing controller 120 accordingly sends a timing signal C1 and a data signal D1. The data signal D1 is, for example, a command to drive the current value and timing of the pixel 111P, while the timing signals C1 to C2 are... N For example, it is used to locate the driven pixel 111P. The data signal D1 can be stored in the temporary register (not shown) of the drive circuit 112.

[0057] Please refer to Figure 4 It illustrates a pixel module P according to an embodiment of the present invention. n×m A one-pixel cross-sectional view. In pixel module P... n×mIn this design, a pixel 111P includes red, blue, and green sub-pixels. Each RGB sub-pixel includes light-emitting diodes 111a, 111b, and 111c electrically connected to a driving circuit 112 (not shown), multiple light-shielding layers 113, and an electrical substrate 114. The light-emitting diodes 111a, 111b, and 111c are configured and electrically connected to the electrical substrate 114. The light-shielding layers 113 surround the light-emitting diodes 111a, 111b, and 111c, with adjacent diodes 111a, 111b, and 111c separated by the light-shielding layers 113. The light-shielding layers 113 may be, for example, a black matrix.

[0058] like Figure 4 As shown, LEDs 111a, 111b, and 111c can be blue LEDs. The red sub-pixel 111R includes a blue-emitting LED 111a and a red wavelength conversion layer 1112R. The green sub-pixel 111G includes a blue-emitting LED 111b and a green wavelength conversion layer 1112G. The blue sub-pixel 111B includes a blue-emitting LED 111c and a light-transmitting layer 116. The red wavelength conversion layer 1112R is, for example, a red quantum dot or a red phosphor. The red wavelength conversion layer 1112R covers the LED 111a and converts the blue light emitted by the LED 111a into red light. The green wavelength conversion layer 1112G is, for example, a green quantum dot or a green phosphor. The green wavelength conversion layer 1112G covers the LED 111b and converts the blue light emitted by the LED 111b into green light. The light-transmitting layer 116 does not contain a wavelength conversion material. The light-transmitting layer 116 covers the light-emitting diode 111c, allowing the blue light emitted by the light-emitting diode 111c to pass through the light-transmitting layer 116 and maintain the blue light.

[0059] Please refer to Figure 5 Its illustration depicts a pixel module P according to other embodiments of the present invention. n×m A schematic diagram. Each pixel module P n×m The system includes multiple light-emitting diodes (LEDs) 111a, 111b, and 111c, a driving circuit 112, an electrical substrate 114, and a package 115. The LEDs 111a, 111b, and 111c are configured and electrically connected to the electrical substrate 114. These LEDs 111a, 111b, and 111c are red, green, and blue LEDs, respectively, forming multiple pixels 111P and controlled by the driving circuit 112. The package 115 encapsulates the LEDs 111a, 111b, and 111c, as well as the driving circuit 112. Figure 5 In this embodiment, the pixel module includes nine groups of light-emitting diodes 111a, 111b, and 111c, which constitute nine pixels. In some embodiments, the encapsulation body 115 includes a light-transmitting resin.

[0060] Furthermore, although not shown, each pixel module P n×m It also includes multiple pads, such as grounding pads, timing pads, data pads, and power pads. Signals from the timing controller 120 are transmitted to the pixel module P through these pads. n×m The timing pads can be electrically connected to the timing signal lines W. C The data pad can be electrically connected to the data signal line W. D The power pad is electrically connected to the drive circuit 112, and an external power source (not shown) can be supplied to the drive circuit 112 through the power pad. Compared to the aforementioned control group, the pixel module P of this embodiment of the invention... n×m It can be a package containing multiple light-emitting diodes and driving circuits, with its bottom surface providing a sufficient bottom area so that the area of ​​the pads formed on the bottom surface can be larger and the spacing between the two pads can be greater.

[0061] In summary, this invention provides a display device, its light-emitting module, and a driving method. The light-emitting module includes multiple pixel modules, each pixel module includes J pixel blocks, wherein each of the J pixel blocks includes at least one pixel, and each pixel includes three light-emitting diodes (LEDs). Taking a single pixel module as an example, in one cycle, the duty cycle of the driving current is 1 / J, and the current value is J times the average driving current, which can improve the luminous efficiency of certain LEDs (e.g., red LEDs). In an experimental example where the pixel spacing is 0.36 mm and J = 3, the driving current for the red LED is 33 microamperes (μA), and the brightness is 17.2 (Cd / m²). 2 The driving current for the green LED is 10.5 microamperes, and the brightness is 83.8 (Cd / m²). 2 The driving current for the blue light-emitting diode is 12 microamps, and the brightness is 11.3 (Cd / m²). 2 In the aforementioned driving mode, the power consumption of the light-emitting module 110 is reduced by 3% to 5% (compared to existing light-emitting modules).

[0062] In summary, although the present invention has been disclosed above with reference to embodiments, it is not intended to limit the invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the invention, and these modifications and refinements are not limited to the embodiments of the present invention, but are still within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the appended claims.

Claims

1. A light-emitting module, comprising: N×M pixel modules are arranged in a two-dimensional array. Each pixel module includes a driving circuit and multiple light-emitting diodes. The multiple light-emitting diodes constitute multiple pixels in the corresponding pixel module and are controlled by the driving circuit. Each driving circuit is used to apply a driving current to the multiple light-emitting diodes in the corresponding pixel module. N and M are positive integers greater than or equal to 2. In this cycle, the duty cycle of each driving current's operating interval is 1 / J, and in this operating interval, the driving current is J times the average driving current, where J is a positive integer equal to or greater than 2.

2. The light-emitting module as claimed in claim 1, wherein each pixel module further comprises: A package for encapsulating the plurality of light-emitting diodes and the driving circuit.

3. The light-emitting module as claimed in claim 1, wherein at least three of the plurality of light-emitting diodes of each pixel module constitute one pixel.

4. The light-emitting module as described in claim 3, wherein the plurality of light-emitting diodes are sub-millimeter light-emitting diodes or micro light-emitting diodes.

5. A display device, comprising: The light-emitting module includes: N×M pixel modules are arranged in a two-dimensional array. Each pixel module includes a driving circuit and multiple light-emitting diodes. The multiple light-emitting diodes constitute multiple pixels in the corresponding pixel module and are controlled by the driving circuit. Each driving circuit is used to apply a driving current to the multiple light-emitting diodes in the corresponding pixel module. N and M are positive integers greater than or equal to 2. A timing controller, used to generate timing signals and data signals to drive one of the multiple pixel modules; In this cycle, the duty cycle of each driving current's operating interval is 1 / J, and in this operating interval, the driving current is J times the average driving current, where J is a positive integer equal to or greater than 2.

6. The display device of claim 5, wherein each pixel module further comprises: A package for encapsulating the plurality of light-emitting diodes and the driving circuit.

7. The display device of claim 5, wherein at least three of the plurality of light-emitting diodes of each pixel module constitute a pixel.

8. The display device of claim 7, wherein the plurality of light-emitting diodes are sub-millimeter light-emitting diodes or micro light-emitting diodes.

9. A method for driving a display device, comprising: The timing controller generates timing signals and data signals to drive N×M pixel modules, each of which includes a driving circuit and multiple light-emitting diodes. The multiple light-emitting diodes constitute multiple pixels in the corresponding pixel module and are controlled by the driving circuit, and N and M are positive integers greater than or equal to 2. as well as The driving circuit of the driven subject applies a driving current to the plurality of light-emitting diodes in the corresponding pixel module, wherein the duty cycle of the working interval of the driving current is 1 / J during the period, and the driving current is J times the average driving current during the working interval, where J is a positive integer equal to or greater than 2.

10. The driving method for the display device as claimed in claim 9, wherein the plurality of light-emitting diodes are sub-millimeter light-emitting diodes or micro light-emitting diodes.

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