Patent Application
20090121986
1. Technical Field
The present invention relates to display apparatuses, and particularly, to a display apparatus with solid state light emitting elements.
2. Description of Related Art
Solid state light emitting elements, such as light emitting diodes (LEDs) have been widely used in display apparatuses.
A typical LED display apparatus is made up of a plurality of pixel units arranged in a matrix having rows and columns. Each of the pixel units is made up of several LEDs. In a full color LED display apparatus, each of the pixel units is comprised of at least one red LED, one green LED, and one blue LED. Each of the pixel units can produce a specific perceived light intensity depending on the amount of current supplied to the LEDs.
In the typical LED display apparatus, several LEDs are connected to a data bus, i.e., in a serial form. However, if the data bus malfunctions, all of the LEDs connected to the data bus will not work. As a result, data transmission is no longer reliable.
What is needed, therefore, is a display apparatus to overcome the above described shortcoming.
A display apparatus includes a display system and a control system. The display system includes a plurality of pixel units arranged in a matrix and a network interface based on a network protocol. Each of the pixel units includes a plurality of solid state light emitting elements. The control system includes a control module, an input module and an output module. The output module is electronically coupled to the network interface. The control system is configured to receive an input signal through the input module, generate a corresponding control signal by the control module, and output the control signal by the output module to the display system via the network interface according to the network protocol to control the display contents of the display system.
Other advantages and novel features of the present display apparatus will become more apparent from the following detailed description of embodiment when taken in conjunction with the accompanying drawings.
Many aspects of the display apparatus can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present display apparatus. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.
Embodiment of the present display apparatus will now be described in detail below and with reference to the drawings.
Referring to
The display system 12 includes a plurality of pixel units 122 and a network interface 124 based on a network protocol. The pixel units 122 are arranged in a matrix having rows and columns. In one embodiment, the network protocol may be a transfer control protocol (TCP) and an internet protocol (IP). In other embodiments, the network protocol may be varied according to need.
The control system 14 includes a control module 142, an input module 144 and an output module 146. The output module 146 is electronically coupled to the network interface 124. The control system 14 is configured to receive an input signal through the input module 144, generate a corresponding control signal by the control module 142, and output the control signal by the output module 146 to the display system 12 via the network interface 124 according to the network protocol.
Also referring to
The control module 142 may be installed in a Windows or Linux operating system.
The input module 144 may have a memory card reading unit to receive data from a memory card, a data inputting interface to receive inputted data, and a wireless data receiving unit, such as a bluetooth receiving unit to wirelessly receive inputted data.
The output module 146 is configured to output the control signal from the control module 142 to the plurality of pixel units 122 via the network interface 124 according to the network protocol.
In the display apparatus 10, the network interface 124 is applied to the display system 12, each of the pixel units 122 is connected to the network interface 124. As a result, a more reliable data transmission and a long-distance control can be achieved.
Referring to
The memory 2223 is configured to memorize a color/brightness value of each of the pixel units 122. The memory 2223 may be an electrically erasable programmable read only memory or a flash memory. The micro processor unit 2221 is configured to receive the control signal from the control system 14 and a currently detected color/brightness value of each of the pixel units 122, and adjust the control signal based on residual values between the initial color/brightness value and the currently detected color/brightness value. The control unit 2222 is configured to receive and convert the adjusted control signal into a driving signal. Each of the driving circuits 2224 is connected to each corresponding LED 1226 and configured to provide a driving current for each corresponding LED 1226 based on the driving signal.
The light intensity value of each of the pixel units 122 may be externally detected by a charge coupled device arranged adjacent to each of the pixel units 12. Due to the configuration of the micro processor unit 2221 and the memory 2223, light output decay of the LEDs 1226 can be compensated.
It may be appreciated that the LEDs 1226 can also be replaced by other solid state light emitting elements.
It is understood that the above-described embodiments are intended to illustrate rather than limit the invention. Variations may be made to the embodiments and methods without departing from the spirit of the invention. Accordingly, it is appropriate that the appended claims be construed broadly and in a manner consistent with the scope of the invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 200710202458.5 | Nov 2007 | CN | national |
