Signal synchronization for a display
AssigneeGoogle Inc.
InventorsEdwin Lyle Hudson, Bo Li, Samuel Tien-en Lee, Kaushik Indravadan Sheth
Life of this patent
Estimating the term…
Abstract
A backplane including bit lines and word lines to update a radiative state of a pixel is disclosed. The back plane includes a first delay line that replicates delays caused by a bit line and a second delay line that replicates delays caused by a word line. The replicated delays cause word line signals traveling along a first path to arrive at a pixel at approximately the same time as bit line signals traveling along a second path. The delays are added incrementally row-by-row and column-by-column so that each pixel can receive synchronized signals regardless of its position in the array of pixels.
Claims19
A backplane for a display, the backplane comprising:
- pixels in a two-dimensional array;
- word lines coupled to rows of pixels in the two-dimensional array;
- a first delay line including a first plurality of delay elements connected in series, the word lines being connected to respective outputs of corresponding delay elements of the first delay line, wherein each delay element of the first plurality of delay elements includes a first resistor-capacitor circuit;
- bit lines coupled to columns of pixels;
- and
- a second delay line including a second plurality of delay elements connected in series, each bit line connected to an output of a corresponding delay element of the second delay line, wherein each delay element of the second plurality of delay elements includes a second resistor-capacitor circuit.
A method for controlling a pixel in a display, the method comprising:
- coupling a particular word line to a particular delay element of a first delay line, the first delay line including a first plurality of delay elements connected in series between a first input of the first delay line and the particular word line, wherein each delay element of the first plurality of delay elements includes a first resistor-capacitor circuit;
- transmitting a word line signal for the particular word line to the first input of the first delay line;
- coupling a particular bit line to a particular delay element of a second delay line, the second delay line including a second plurality of delay elements connected in series between a second input of the second delay line and the particular bit line, wherein each delay element of the second plurality of delay elements includes a second resistor-capacitor circuit;
- transmitting a bit line signal for the particular bit line to the second input of the second delay line;
- receiving the word line signal at the pixel after first delay generated by the first delay line;
- and
- receiving the bit line signal at the pixel after a second delay generated by the second delay line.
A display comprising:
- a two-dimensional array of pixels coupled to word lines and bit lines;
- a first delay line including a first plurality of delay elements, the word lines connected to the first delay line at respective outputs of the first plurality of delay elements;
- a second delay line including a second plurality of delay elements, the bit lines connected to the second delay line at respective outputs of the second plurality of delay elements;
- and
- a controller configured to:
- transmit a word line signal for a particular pixel to a first input of the first delay line, the word line signal delayed by a first delay generated by the first delay line;
- and
- transmit a bit line signal for the particular pixel to a second input of the second delay line, the bit line signal delayed by a second delay generated by the second delay line, the word line signal and the bit line signal reaching the particular pixel within a window of time determined by the first delay and the second delay, wherein each delay element of the first plurality of delay elements includes a first resistor-capacitor circuit and each delay element of the second plurality of delay elements includes a second resistor-capacitor circuit.
Dependencies are inferred from the claim text.