TW201322231A - Display and method for generating power output of the display - Google Patents

Abstract

A display includes a switching power supply and a display panel including a plurality of pixels. A method for generating power output of the display includes receiving data of the pixels, adjusting the switching power supply and generating power output according to the data of the pixels, and providing the power output to the display panel.

Description

Display and method thereof for generating power output

The present invention relates to a method of producing a power output by a display, and more particularly to a method of adjusting a power supply of a display.

Liquid crystal display (LCD) is currently the most common type of display and has been widely used. It has the characteristics of thin and light appearance, low power consumption and low radiation pollution, and gradually replaces the traditional desktop computer. CRT monitors are widely used in electronic products such as notebook computers, mobile phones, and televisions. The liquid crystal display utilizes the characteristics that the liquid crystal molecules exert different polarization or refraction effects on the light in different arrangement states to control the amount of light penetration, thereby displaying the image.

Organic Light Emitting Diode (OLED) display has the advantages of self-illumination, wide viewing angle, high contrast, low operating voltage, short dynamic response time, bright color, simple process, small panel size and thin panel thickness. . The OLED system is biased so that the internal electron holes pass through the Hole Transport Layer and the Electro Transport Layer, respectively, and then organic substances having luminescent properties are added, and when they are combined, they form " After the exciton is excited, the energy is released and returned to the ground state. Among the released energy, some of the energy can be light of different colors due to the different luminescent materials selected. The form is released and forms a luminescence phenomenon. However, the current stage of OLED displays is still relatively short compared to LCD displays in terms of service life, and its service life is mainly limited by the length and intensity of OLED illumination. Therefore, if the power consumption of the OLED display can be effectively reduced, the service life of the OLED will also increase significantly.

Please refer to FIG. 1 , which is a schematic diagram of power management of the prior art display 100. As shown in FIG. 1, the display 100 includes a power saving module 10, a power management integrated circuit 20, and a display panel 30. The power saving module 10 is coupled to the power management integrated circuit 20 , and the power management integrated circuit 20 is coupled to the display panel 30 . The power saving module 10 includes a power saving mode selecting device 2, a control logic 4, a power switch 6, and a current detecting device 8. The power saving mode selecting means 2 turns on or off the power switch 6 through the control logic 4 to adjust the power output from the power management integrated circuit 20 to the display panel 30. The current detecting device 8 detects the current of the power management integrated circuit 20 and transmits the signal to the power saving mode selecting device 2, so that the power saving mode selecting device 2 can adjust the control logic 4 according to the detected current magnitude. The duty cycle of the power switch 6.

For example, when the current detecting device 8 detects that the current load of the power management integrated circuit 20 is low, the turn-on time of the power switch 6 can be lowered to reduce the power loss. On the other hand, when the current detecting device 8 detects that the current load of the power management integrated circuit 20 is high, the turn-on time of the power switch 6 can be increased to ensure that the power management integrated circuit 20 can supply a sufficient current.

However, the power saving of the display 100 by the above apparatus and method requires additional circuit design, and this additional circuit design itself also causes additional power loss. In addition, the above apparatus and method are required to adjust the power output after detecting the magnitude of the current load of the power management integrated circuit 20, thereby causing the display 100 to make an inappropriate power adjustment. For example, when the grayscale value of the screen displayed by the display panel 30 is low, such as a black screen, the current detecting device 8 will detect a small current, so the power saving mode selecting device 2 will adjust the duty cycle of the power switch 6. When the display panel 30 displays the next screen, the display 100 has a lower power consumption. However, if the display panel 30 will display the grayscale value of the next screen to be high, such as a white screen, due to the power switch 6 The duty cycle is lowered according to the grayscale value of the previous picture, resulting in the power management integrated circuit 20 not supplying sufficient current to cause a serious deviation in the color of the picture displayed on the display panel 30. On the other hand, if the grayscale value of the next picture is much lower than the grayscale value of the previous picture, the power management integrated circuit 20 causes the display panel 30 to cause additional power loss due to the supply of excessive current.

One embodiment of the present invention provides a method of generating a power output from a display. The display includes a switched power supply and a display panel, and the display panel includes a plurality of pixels. The method for generating a power output by the display includes receiving data of the pixels, adjusting a switched power supply according to the data of the pixels, generating a power output, and providing the generated power output to the display panel.

Another embodiment of the present invention provides a display including a display panel, a receiving unit, and a switched power supply. The display panel includes a plurality of pixels, the receiving unit is configured to receive the data of the pixels, and the switching power supply is electrically coupled to the display panel for adjusting the switching power supply according to the data of the pixels, and providing The power is output to the display panel.

Through the device and method of the present invention, the display can calculate the display data to be transmitted to the display panel to adjust the power consumption of the display, thereby effectively reducing the power consumption of the display without avoiding deviation of the color of the screen.

Please refer to FIG. 2, which is a schematic diagram of power management of the display 200 of the present invention. As shown in FIG. 2, the display 200 includes a display panel 80, a receiving unit 70, a switching power supply 90, and an analysis unit 110. Display panel 80 includes a plurality of pixels 82. The switching power supply 90 is electrically coupled to the display panel 80 for outputting power to the display panel 80. The receiving unit 70 receives the data 60 of the plurality of pixels 82 of the display panel 80. The analyzing unit 110 is electrically coupled between the receiving unit 70 and the switching power supply 90 for analyzing the data 60 sent from the receiving unit 70, and adjusting the working period of the switching power supply 90 according to the result of the analysis data 60. To change the power consumption of the switched power supply 90.

In addition, the analyzing unit 110 can also adjust the switched power supply 90 according to the data 62 of the plurality of pixels 84 of the display panel 80. When the analyzing unit 110 adjusts the switching power supply 90 according to the data 62 of the plurality of pixels 84 of the display panel 80, the receiving unit 70 receives the data 62 of the plurality of pixels 84 of the display panel 80, and then the analyzing unit 110 The data 62 is adjusted for the duty cycle of the switched power supply 90.

When the receiving unit 70 receives the data 60 or 62, the analyzing unit 110 calculates the grayscale value of the data 60 or 62 to determine whether the display panel 80 will display the high load state or the low load state when displaying the data 60 or 62. Therefore, the analyzing unit 110 adjusts the duty cycle of turning on/off the switching power supply 90 based on the calculated gray level value of the data 60 or 62. When calculating the grayscale value of the data 60 or 62, the analyzing unit 110 can calculate the grayscale average of the data 60 or 62, that is, the data 60 or 62 includes three grayscale values of red, green, and blue (RGB) corresponding to the plural pixels. The average value is adjusted to adjust the switching power supply 90. However, in the present invention, when calculating the grayscale value of the data 60 or 62, the analyzing unit 110 may multiply the three grayscale values of the data 60 or 62 by different weight values, and then calculate an average. Value to adjust the switched power supply 90.

In addition, the analyzing unit 110 may also calculate the data 60 or 62 of the continuous two-picture period received by the receiving unit 70, that is, adjust the switching according to the difference between the data period 60 or 62 of the two-picture period and the data 60 or 62 in the two picture period. The power supply 90, for example, when the pictures 60 and 62 have large differences in screens, it can be predicted that the display panel 80 may require a large load to convert the data 60 into the data 62. When the pictures 60 and 62 have small differences, It can be predicted that display panel 80 may require less load to convert material 60 into material 62.

For example, when the analysis unit 110 calculates that the grayscale average of the data 60 or 62 is low, the turn-on time of the switched power supply 90 can be lowered to reduce power loss. On the contrary, when the analyzing unit 110 calculates that the gray level average value of the data 60 or 62 is too large, the opening time of the switching power supply 90 can be increased to ensure that the switching power supply 90 supplies sufficient current to the display panel. 80. According to an embodiment of the present invention, of course, the switched power supply 90 can also be adjusted based on the difference between the data 60 or 62 and the data 60 or 62 in the two picture periods.

In addition, in addition to adjusting the switching period, when the switching power supply 90 is controlled by Pulse Width Modulation (PWM), it will follow the output voltage of the switching power supply 90 and the reference voltage (ie, the switching power supply). The preset output voltage of the device 90 is used to adjust the length of time between the closing time and the closing time of each opening and closing cycle of the power switch 6, that is, the duty ratio, in the embodiment of the present invention. In the middle, the length of each opening and closing cycle of the power switch 6 can be adjusted according to the data 60 or 62. In other words, the frequency of the power switch 6 is turned on and off each time, when the gray level average is low, the power is Each turn-on and turn-off period of the switch 6 is long, so that the power switch 6 does not switch too frequently. When the gray-scale average value is high, each turn-on and turn-off period of the power switch 6 is short, so that the power switch 6 is frequently switched. In accordance with an embodiment of the present invention, it is of course also possible to adjust the switched power supply 90 based on the difference between the data 60 or 62 and the data 60 or 62 in the two picture periods.

In addition, in addition to adjusting the above parameters, when the switching power supply 90 is controlled by Pulse Frequency Modulation (PFM), it will follow the output voltage of the switching power supply 90 and the reference voltage (ie, the switching power supply). In the embodiment of the present invention, the power switch 6 can be adjusted according to the data 60 or 62, that is, each time the power switch 6 is turned on, that is, each time the power switch 6 is turned on and off. Cycle duty ratio (Duty Ratio), for example, when the gray level average is low, the power switch 6 is turned on for a short time (that is, the load is relatively small), and when the gray level average is high, the power switch Each opening time of 6 is longer (that is, the load is relatively large). According to the embodiment of the present invention, of course, the switching power supply can be adjusted according to the difference between the data 60 or 62 and the data 60 or 62 in the two picture period. 90.

In addition, in addition to adjusting the above parameters, the switching power supply 90 can adjust the control mode of the switching power supply 90 according to the data 60 or 62, for example, adjusting between pulse frequency modulation or pulse width modulation. In the embodiment of the invention, of course, the switched power supply 90 can also be adjusted based on the difference between the data 60 or 62 and the data 60 or 62 in the two picture periods.

Moreover, the gray level average value is low or high, which can be defined according to actual needs.

Please refer to FIG. 3, which is a schematic diagram of the present invention for power management of the display 200 of FIG. 2 according to the information 62 to be displayed. As shown in FIG. 3, the receiving unit 70 receives the material 62 and transmits the material 62 to the analyzing unit 110. When the column pixel data 64 in the data 62 is respectively high gray scale column pixel data 72 (such as white screen), low gray scale column pixel data 74 (such as black screen) or gray scale value is between high gray scale columns When the middle gray scale column pixel data 76 between the prime data 72 and the low gray scale column pixel data 74, the analyzing unit 110 determines to control the switched power supply 90 in the heavy load state 112 and the light load state 114, respectively. Or the neutral state 116 to make different adjustments to the duty cycle of the switched power supply 90.

In summary, through the apparatus and method disclosed by the present invention, the display 200 can perform calculation according to the data to be transmitted to the display panel 80 to adjust the power consumption of the display 200, thereby effectively preventing the image color from being deviated. The power consumption of the display 200 is lowered.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

2. . . Power saving mode selection device

4. . . Control logic

6. . . Power switch

8. . . Current detecting device

10. . . Power saving module

20. . . Power management integrated circuit

30, 80. . . Display panel

60, 62. . . data

64. . . Column data

70. . . Receiving unit

82. . . Pixel

84. . . Column

90. . . Power Supplier

100, 200. . . monitor

110. . . Analysis unit

72. . . High gray scale column pixel data

74. . . Low gray scale column pixel data

76. . . Medium gray scale column pixel data

112. . . Overload status

114. . . Light load status

116. . . Medium load state

Figure 1 is a schematic diagram of power management for a conventional display.

Figure 2 is a schematic diagram of power management of the display of the present invention.

Figure 3 is a schematic diagram showing the power management of the display of Figure 2 according to the data to be displayed.

60, 62. . . data

70. . . Receiving unit

80. . . Display panel

82. . . Pixel

84. . . Column

90. . . Power Supplier

200. . . monitor

110. . . Analysis unit

Claims (10)

A display device for generating a power output, the display comprising a switching power supply and a display panel, the display panel comprising a plurality of pixels, the method comprising: receiving data of the pixels; adjusting according to the data of the pixels The switching power supply generates a power output; and provides the power output to the display panel. The method of claim 1, wherein the switched power supply is adjusted according to the data of the pixels to adjust a control mode of the switched power supply according to the data of the pixels. The method of claim 1, wherein the switching power supply is adjusted according to the data of the pixels to adjust a duty cycle of the switched power supply according to the data of the pixels. The method of claim 1, wherein the switching power supply is adjusted according to the data of the pixels to adjust the switching power supply in a pulse width modulation control mode according to the data of the pixels. Switching frequency or load ratio in pulse frequency modulation control mode. The method of claim 1, 2, 3 or 4, wherein the switched power supply is adjusted according to the data of the pixels according to a grayscale average of the pixels or the pixels are consecutive The data of the picture period adjusts the switching power supply. The method of claim 1, wherein the switched power supply is adjusted according to the data of the pixels to adjust the switched power supply according to data of a list of sub pixels. A display comprising: a display panel comprising a plurality of pixels; a receiving unit for receiving data of the pixels; and a switching power supply electrically coupled to the display panel for displaying the pixels according to the pixels The data is adjusted to the switched power supply and a power output is provided to the display panel. The display of claim 7, wherein the switching power supply adjusts a duty cycle or an operation mode of the switched power supply according to the data of the pixels. The display of claim 7 or 8, wherein the switched power supply adjusts the switched power supply based on a grayscale average of the pixels. The display of claim 7 or 8, wherein the switched power supply adjusts the switched power supply based on data of the pixels over two consecutive picture periods.