DISPLAY APPARATUS

• US 20170316747A1
• Filed: 04/21/2017
• Published: 11/02/2017
• Est. Priority Date: 04/28/2016
• Status: Abandoned Application

• Current Assignee: Tianma Microelectronics Company Limited
• Original Assignee: NLT Technologies, Ltd. (Tianma Microelectronics Company Limited)
• Inventors: MATSUEDA, Yojiro
• Application Number:
  US15/493,458
• Publication Number:
  US 20170316747A1
• Time in Patent Office: Days
• CPC Class Codes: G09G 2310/0297 Special arrangements with multiplexing or demultiplexing of display data in the drivers for data electrodes, in a pre-processing circuitry delivering display data to said drivers or in the matrix panel, e.g. multiplexing plural data signals to one D/A converter or demultiplexing the D/A converter output to multiple columns
• CPC Class Codes: G09G 2320/0223 Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
• CPC Class Codes: G09G 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• CPC Class Codes: G09G 3/3607 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: G09G 3/3688 suitable for active matrices only

Abstract

A display apparatus suppresses flicker, and includes a display part in which a first plurality of main pixels PX1 to PX4 including subpixels R1 to R4, G1 to G4 and B1 to B4 of a first to an N-th color are arrayed in a line, the “N” being an integer larger than 1; and a demultiplexer including distribution units 41-46 distributing a drive signal CKH, driving any one of a plurality of subpixels included in a subpixel group to the one of the plurality of subpixels. The subpixel group includes multiple subpixels SPX1 and SPX2 included in a second plurality of main pixels PX1 and PX3 among the first plurality of main pixels, one or more main pixels being interposed between the second plurality of main pixels, the subpixels SPX1 and SPX 2 being subpixels having the same color to which drive signals of the same polarity are input.

Claims

1. A display apparatus, comprising:

a display unit in which a first plurality of main pixels including subpixels of a first color to an Nth color are arrayed in a line, the “

N”

being an integer larger than 1; and

a demultiplexer including a distribution unit configured to distribute a drive signal which drives any one of a plurality of subpixels included in a subpixel group to the one of the plurality of subpixels,

wherein the subpixel group includes a plurality of subpixels included in a second plurality of main pixels among the first plurality of main pixels, one or more main pixels being interposed between the second plurality of main pixels, the plurality of subpixels being subpixels having a same color to which drive signals of a same polarity are input.

2. The display apparatus according to claim 1, wherein

the demultiplexer includes a plurality of distribution units respectively corresponding with subpixel groups in one-to-one correspondence, and

at least one of the distribution units sequentially distributes drive signals which drive subpixels included in a subpixel group corresponding with the one of the distribution units to the subpixels.

3. The display apparatus according to claim 2, wherein

each of first to N-th subpixel groups includes subpixels of first to N-th colors, and

a first to N-th distribution units respectively corresponding with the first to N-th subpixel groups simultaneously distribute input drive signals.

4. The display apparatus according to claim 2, wherein

the subpixel group includes first and second subpixels included in two main pixels with one main pixel interposed between the two main pixels, the first and second subpixels being subpixels having a same color to which drive signals of a same polarity are input, and

a distribution unit corresponding with the subpixel group sequentially distributes the drive signals that are sequentially input, to the first subpixel and the second subpixel.

5. The display apparatus according to claim 4, further comprising a control circuit configured to generate a first control signal and a second control signal to control the demultiplexer, and sequentially to output the generated first and second control signals to the demultiplexer,

wherein the distribution unit distributes a drive signal which drives the first subpixel to the first subpixel in response to the first control signal, and distributes a drive signal which drives the second subpixel to the second subpixel in response to the second control signal.

6. The display apparatus according to claim 5, wherein

the N is 3,

the display unit includes at least first to fourth main pixels arrayed in a line, the second main pixel is adjacent to the first main pixel and the third main pixel, and the fourth main pixel is adjacent to the third main pixel,

each of the first main pixel to the fourth main pixel includes subpixels of a first color to a third color arrayed in a line, and the demultiplexer includes:

an i-th distribution unit corresponding with an i-th subpixel group in one-to-one correspondence, the i-th subpixel group including subpixels of an i-th color included in the first main pixel and the third main pixel, the “

i”

being an integer of 1, 2 or 3; and

an i+3 distribution unit corresponding with an i+3 subpixel group in one-to-one correspondence, the i+3 subpixel group including subpixels of an i-th color included in the second main pixel and the fourth main pixel.

7. The display apparatus according to claim 6, wherein

the i-th distribution unit distributes a drive signal to a subpixel included in the first main pixel in response to the first control signal, while the (i+3)-th distribution unit distributes a drive signal to a subpixel included in the second main pixel in response to the first control signal, and the i-th distribution unit distributes a drive signal to a subpixel included in the third main pixel in response to the second control signal, while the (i+3)-th distribution unit distributes a drive signal to a subpixel included in the fourth main pixel in response to the second control signal.

8. The display apparatus according to claim 6, wherein

the (2i−

1)-th distribution unit distributes a drive signal to a subpixel included in the (i div 3+3)-th main pixel in response to the first control signal, while the 2i-th distribution unit distributes a drive signal to a subpixel included in the (i div 2+1)-th main pixel in response to the first control signal,

the (2i−

1)-th distribution unit distributes a drive signal to a subpixel included in the (i div 3+1)-th main pixel in response to the second control signal, while the 2i-th distribution unit distributes a drive signal to a subpixel included in the (i div 2+3)-th main pixel in response to the second control signal, and

n div m indicates an integer unit of a quotient obtained by dividing n by m.

9. The display apparatus according to claim 6, wherein

in a scanning period during which the plurality of subpixels arrayed in a line are simultaneously scanned, the control circuit outputs the second control signal after the first control signal is output, and

the first period during which the first control signal is output to the demultiplexer is longer than the second period during which the second control signal is output to the demultiplexer.

10. The display apparatus according to claim 6, wherein

the control circuit starts outputting the first control signal before a scanning period during which the plurality of subpixels arrayed in a line simultaneous scanned.

11. The display apparatus according to claim 2, wherein

the distribution unit further includes a driver circuit configured to output a drive signal which includes a first polarity and which drives a subpixel or a drive signal which includes a second polarity and which drives a subpixel, and

the driver circuit outputs drive signals of a same polarity to the distribution unit in a period during which the plurality of subpixels arrayed in a line scanned.

12. The display apparatus according to claim 11, wherein

the driver circuit outputs the drive signal which includes the first polarity and which drives a first subpixel to a distribution unit corresponding with a subpixel group including the first subpixel, and outputs the drive signal which includes the second polarity and which drives a second subpixel to a distribution unit corresponding with a subpixel group including the second subpixel adjacent to the first subpixel.

13. The display apparatus according to claim 2, wherein

the subpixel group includes first to fourth subpixels respectively included in first to fourth main pixels, the first to fourth main pixels being arrayed every other, the first to fourth subpixels being subpixels having a same color to which drive signals of a same polarity are input, and

the distribution unit corresponding with the subpixel group distributes drive signals, which are sequentially input, to the first subpixel to the fourth subpixel in sequence.

14. The display apparatus according to claim 13, further comprising a control circuit configured to generate a j-th control signal (j is an integer of 1, 2, 3 or 4) to control the demultiplexer, and sequentially to output the j-th control signals to the demultiplexer,

wherein the distribution unit distributes a drive signal to drive a j-th subpixel to the j-th subpixel in response to the j-th control signal.