Data transmission system including encoder and a clock recovery system for display device, data transmission method for display device and display device

• US 10,170,028 B2
• Filed: 05/15/2017
• Issued: 01/01/2019
• Est. Priority Date: 03/29/2011
• Status: Active Grant

• Current Assignee: Renesas Electronics Corporation
• Original Assignee: Renesas Electronics Corporation
• Inventors: Sugiyama, Akio, Nose, Takashi, Hori, Yoshihiko, Furihata, Hirobumi
• Primary Examiner(s): Lin, Hang
• Application Number:
  US15/595,641
• Publication Number:
  US 20170250843A1
• Time in Patent Office: 596 Days
• CPC Class Codes: G06F 13/00 Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units interface circuits for specific input/output devices G06F3/00 ; multiprogram control therefor G06F9/46; multiprocessor systems G06F15/16
• CPC Class Codes: G09G 2310/027 Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2320/064 by time modulation of the brightness of the illumination source
• CPC Class Codes: G09G 2330/06 Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation
• CPC Class Codes: G09G 2360/127 Updating a frame memory using a transfer of data from a source area to a destination area
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 2370/00 Aspects of data communication
• CPC Class Codes: G09G 3/2018 by time modulation using two or more time intervals
• CPC Class Codes: G09G 3/2096 Details of the interface to the display terminal specific for a flat panel suitable for both CRT and flat panel G09G5/006; specific for a CRT G09G1/167
• CPC Class Codes: G09G 5/008 Clock recovery
• CPC Class Codes: G09G 5/18 Timing circuits for raster scan displays specially adapted for television H04N ; synchronisation between the display unit and other display units, videodisc player G09G5/12
• CPC Class Codes: H04L 25/49 using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems spectral shaping H04L25/03828
• CPC Class Codes: H04L 25/4908 using mBnB codes
• CPC Class Codes: H04N 7/01 Conversion of standards , e.g. involving analogue television standards or digital television standards processed at pixel level

Abstract

A data transmission system for a display device, the data transmission system comprising: an encoder having at least one translation table, encoding m bits of a data into n bits of a data on the basis of the translation table; a parallel-to-serial converter; a clock recovery circuit for recovering a clock from the data encoded and serialized; a serial-to-parallel converter for decoding the n bits of the encoded data to the m bits of the data; and an output driver for outputting a gray scale voltage, wherein an amplitude of the gray scale voltage is determined according to a value of the m bit of the data, and, wherein in the translation table, a larger the amplitude of the gray scale voltage of a bit pattern in 2 m pieces of bit patterns of the m bits of the data, a larger the data change index of the bit pattern.

Claims

1. A data transmission system for a display device, the data transmission system comprising:

an encoder including at least one translation table, and encoding m (m is a natural number) bits of a data into n (n is a natural number and n>

m) bits of a data on a basis of the translation table;

a parallel-to-serial converter for subjecting the encoded data outputted from the encoder to a parallel-to-serial conversion;

a clock recovery circuit for recovering a clock from the data encoded by the encoder and serialized by the parallel-to-serial converter;

a serial-to-parallel converter for subjecting the data outputted from the parallel-to-serial converter to a serial-to-parallel conversion;

a decoder for decoding the n bits of the encoded data to the m bits of the data in accordance with the clock recovered by the clock recovery circuit; and

an output driver for outputting a gray scale voltage in accordance with the data decoded by the decoder,

wherein an amplitude of the gray scale voltage is determined according to a value of the m bit of the data, and

wherein, in the translation table, a larger the amplitude of the gray scale voltage of a bit pattern in 2^m pieces of bit patterns of them bits of the data, a larger a data change index of the bit pattern which is assigned to the bit pattern in the 2^m pieces of bit patterns in 2ⁿ pieces of bit patterns of the n bits of the data.

2. The data transmission system for a display device according to claim 1, wherein, in the at least one translation table, the encoder includes a first translation table for a normally black mode as the translation table, a larger a data value of the bit pattern in 2^m pieces of the bit patterns of the m bits of the data, a larger the data change index of the bit pattern which is assigned to the bit pattern in the 2^m pieces of bit patterns in the 2ⁿ pieces of the bit patterns of the n bits of the data.

3. The data transmission system for a display device according to claim 1, wherein the encoder includes a second translation table for a normally white mode as the translation table, and in the second translation table, a smaller a data value of the bit pattern in the 2^m pieces of the bit patterns of the m bits of the data, a larger the data change index of the bit pattern which is assigned to the bit pattern in the 2^m pieces of bit patterns in the 2ⁿ pieces of the bit patterns of the n bits of the data.

4. The data transmission system for a display device according to claim 1, further comprising:

a data generating circuit for regularly converting or inversely converting the data inputted to the encoder in accordance with a first display mode signal; and

a data converter for regularly converting or inversely converting the data outputted from the decoder in accordance with a second display mode,

wherein the translation table is only one translation table for a normally black mode or for a normally white mode.

5. The data transmission system for a display device according to claim 4, further comprising:

a first register for storing the first display mode signal; and

a second register for storing the second display mode signal.

6. The data transmission system for a display device according to claim 4, wherein the first and the second display modes comprise signals indicating the normally black mode or the normally white mode.