DISPLAY APPARATUS

Abstract

A display apparatus includes a color display unit including pixels arranged in a matrix. The pixels includes first pixels for blue, second pixels for green, and third pixels for red, data lines connected to corresponding columns in the color display unit, and column-driving circuits connected to the columns in the color display unit and configured to convert input video-signal voltages into color-data-signal currents to be supplied to the color pixels and output the currents to the data lines. Voltage-current conversion gains of the column-driving circuits supplying color-data-signal currents to the first color pixels are set larger than those of the column-driving circuits supplying color-data-signal currents to the second and third color pixels, each of which has a luminance efficiency relative to a current higher than those of the first color pixels.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram illustrating a configuration of a display apparatus according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram illustrating a signal detection circuit employed in the invention.

FIG. 3 is a circuit diagram illustrating a pixel circuit employed in the invention.

FIG. 4 is a timing chart illustrating an operation of the pixel circuit shown in FIG. 3.

FIG. 5 is a circuit diagram illustrating a voltage-current conversion circuit employed in the invention.

FIGS. 6A and 6B are schematic top plan views illustrating a voltage-current conversion transistor employed in the invention.

FIG. 7 is a block diagram illustrating a correction circuit employed in the invention.

FIG. 8 is a circuit diagram illustrating a selection circuit according to the invention and the vicinity thereof.

FIG. 9 is a timing chart illustrating a sampling operation of a column-driving circuit employed in the invention.

FIG. 10 is a timing chart illustrating a programming operation according to the first embodiment of the invention.

FIG. 11 is a schematic view illustrating a programming operation according to the first embodiment of the invention.

FIG. 12 is a timing chart illustrating a programming operation according to a second embodiment of the invention.

FIG. 13 is a timing chart illustrating a programming operation according to the second embodiment of the invention.

FIG. 14 is a schematic diagram illustrating a programming operation according to the second embodiment of the invention.

FIG. 15 is a block diagram illustrating a column-driving circuit and circuits in the vicinity thereof according to a third embodiment of the invention.

FIG. 16 is a schematic diagram illustrating the relationship between a characteristic of the voltage-current conversion transistor and an amplitude of a video signal according to the first embodiment of the invention.

FIG. 17 is a block diagram illustrating an example of electronic apparatuses to which the invention is applied.

FIG. 18 is a block diagram illustrating a display apparatus in the related art.

FIG. 19 is a circuit diagram illustrating an example of a column-driving circuit.

FIG. 20 is a schematic diagram illustrating the relationship between a characteristic of the voltage-current conversion transistor and an amplitude of a video signal.

Claims

1. A display apparatus comprising: a color display unit including pixels arranged in a matrix, the pixels including first pixels each emitting first light in accordance with a current, and second pixels each emitting second light, which color is different from the first light, in accordance with a current;row selection lines provided for rows in the matrix of the pixels in the color display unit;data lines provided for columns in the matrix of the pixels in the color display unit, pixels in each of the columns being used for displaying the same color; andcolumn-driving circuits configured to convert input video-signal voltages into data-signal currents and to output the data-signal currents to the data lines, the column-driving circuit being provided for corresponding data lines,wherein an efficiency of luminance of each of the first pixels relative to a current is lower than that of each of the second pixels relative to a current, andwherein voltage-current conversion gains of the column-driving circuits which supply data-signal currents to corresponding data lines used for the first pixels are set larger than those of the column-driving circuits which supply data-signal currents to corresponding data lines used for the second pixels.

2. The display apparatus according to claim 1, further comprising: a correction circuit configured to detect outputs of the column-driving circuits and to correct, in accordance with results of the detection, video-signal voltages supplied to the column-driving circuits.

3. The display apparatus according to claim 1, further comprising: selection circuits configured to provide connections between the data lines and the outputs of the corresponding column-driving circuits which supply the data-signal currents, and to periodically change the connection between a pair of a data line and a column-driving circuit by selecting a column-driving circuit for the connection from a plurality of the column-driving circuits in a certain block having the same voltage-current gains, the selection circuits being arranged between output sides of the column-driving circuits and the data lines.

4. The display apparatus according to claim 3, further comprising: a correction circuit configured to detect outputs of the column-driving circuits and to correct, in accordance with results of the detection, video-signal voltages supplied to the column-driving circuits divided into blocks on a block-by-block basis.

5. The display apparatus according to claim 3, wherein certain rows are selected by an interlace scanning method, and two pixels located in adjacent rows to which data-signal currents are supplied from a common data line receive outputs different from each other supplied from different column-driving circuits in different field periods because of the change of the selection circuit.

6. The display apparatus according to claim 1, wherein the first pixels include light-emitting devices displaying blue, and the second pixels include light-emitting devices displaying red or green.

7. The display apparatus according to claim 1, wherein the color display unit further includes third pixels each emitting light in accordance with a current and displays a third color different from the first and second colors,wherein an efficiency of luminance of each of the first pixels relative to a current is lower than that of each of the third pixels relative to a current, andwherein voltage-current conversion gains of the column-driving circuits which supply data-signal currents to corresponding data lines used for the first pixels are set larger than those of the column-driving circuits which supply data-signal currents to corresponding data lines used for the third pixels.