Control circuit for electronic devices, electronic circuit, electro-optical apparatus, driving method for electro-optical apparatus, electronic system, and control method for electronic devices
View Patent ↗A data-line drive circuit controls a current value of a control signal in every cycle T 1 based on upper 8-bit digital data DAB of digital data In, and performs pulse-width control in a cycle T 2 based on lower 2-bit digital data SUB of the digital data In for the portion which is D/A-converted based on the same digital data of the control signal. It is thus possible to provide an electronic circuit suitable to inhibit a variation in the luminance so as to control the luminance levels of pixels with high precision.
1. An electro-optical apparatus, comprising:
a pixel matrix in which pixels including light-emitting devices are disposed in a matrix;
a plurality of scanning lines respectively connected to pixel groups disposed in one of a row direction and a column direction of the pixel matrix;
a plurality of data lines respectively connected to pixel groups disposed in the other one of the row direction and the column direction of the pixel matrix;
a scanning-line drive circuit connected to the plurality of scanning lines so as to select one row or one column of the pixel matrix; and
a data-line drive circuit to generate, based on a digital signal, a control signal having a current value in accordance with a light-emission grayscale of the light-emitting device, and to output the generated control signal to at least one of said plurality of data lines in a predetermined period, the data-line drive circuit including a first current-value setting device to set the current value of the control signal in each first period, which is provided in the predetermined period, and a second current-value setting device to adjust the current value of the control signal in each second period, which is provided plurally in the predetermined period, and is different from the first period, and is shorter than the first period;
the first current-value setting device setting the current value of the control signal in each of the first period based on part of digital data forming the digital signal; and
the second current-value setting device adjusting the current value of the control signal in each of the second period based on the remaining data other than the part of the digital data used by the first current-value setting device for a portion set by the first current-value setting device based on the same digital data of the control signal.
2. The electro-optical apparatus according to claim 1 ,
the digital data being configured such that an upper bit indicates a higher light-emission grayscale for the light emitting device;
upper bits of the digital data being assigned to the part of the digital data; and
lower bits of the digital data being assigned to the remaining data.
3. The electro-optical apparatus according to claim 2 ,
the second period being the same period as each of divided areas obtained by equally dividing the first period by the number of bits forming the remaining data.
4. The electro-optical apparatus according to claim 2 ,
the digital data being formed of 4n(n≧1)-bit data;
upper 3n-bit data of the digital data being assigned to the part of the data; and
lower n-bit data of the digital data being assigned to the remaining data.
5. The electro-optical apparatus according to claim 1 , the light-emitting devices being organic electroluminescence devices.
6. An electro-optical apparatus, comprising:
a plurality of scanning lines;
a plurality of data lines; and
a plurality of pixel circuits at intersections of the plurality of scanning lines and the plurality of data lines;
data signals to be supplied to the plurality of pixel circuits via the plurality of data lines being generated based on first digital data of a pair of digital data;
signal levels to be supplied to electro-optical devices contained in the plurality of pixel circuits being determined according to the data signals; and
a period control signal to set at least one sub-period in a frame period being generated based on second digital data of the pair of digital data.
7. An electronic system, comprising:
the electro-optical apparatus set forth in claim 1 .