Method for correcting image sensor control circuitry having faulty output values and structure therefor
View Patent ↗Described herein are methods that may improve yield of an image sensor. In one embodiment, a method that may improve yield of an image sensor includes generating output values of control logic associated with an array of light sensitive elements. The method further may include determining if the control logic has one or more faulty output values. The method further may include automatically correcting the one or more faulty output values. In another embodiment, a method that may improve yield of an image sensor includes providing light to an array of light sensitive elements. The method further may include generating an image based on the light sensitive elements and associated control logic. The method further may include disconnecting control lines from control logic that has one or more faulty output values based on viewing the image. The method further may include generating another image based on the control logic having no faulty output values.
1. A method, comprising:
providing a pixel block that comprises an array of light sensitive elements;
generating an image based on the light sensitive elements and associated control logic, wherein the control logic is coupled to a tri-state buffer logic circuit which is coupled to control lines;
generating another image based on the control logic having no faulty output values;
inspecting the image to determine if the control logic has one or more faulty output values; and
configuring the tri-state buffer logic circuit associated with the control logic that has the one or more faulty output values in a high impedance tri-state mode to disconnect the control lines from control logic that has one or more faulty output values.
2. The method of claim 1 , wherein the control logic comprises at least one of shift registers, flip-flops, and address decoders.
3. The method of claim 1 , wherein the disconnected control lines can be controlled with neighboring control logic.
4. The method of claim 1 , wherein disconnecting control lines from control logic that has one or more faulty output values occurs manually or automatically based on a software program.
5. An image sensor, comprising:
a pixel block that comprises an array of light sensitive elements;
control logic circuitry coupled to the array of light sensitive elements, wherein the image sensor is configured for generating an image based on the control logic circuitry having no faulty output values;
control lines coupled to the control logic circuitry, one or more sections of the control logic circuitry having one or more faulty output values, the control lines are configured to disconnect from one or more sections of the control logic circuitry having the one or more faulty output values; and
a tri-state buffer logic circuit coupled to the control logic circuitry and the control lines, wherein the tri-state buffer logic circuit associated with control logic circuitry having faulty output values is configured in a high impedance tri-state mode in order to disconnect control lines from control logic circuitry having faulty output values.
6. The image sensor of claim 5 , wherein the control lines are manually configured to disconnect from one or more sections of the control logic circuitry having one or more faulty output values based on viewing an image of the image sensor.
7. The image sensor of claim 5 , wherein the control lines are automatically configured to disconnect from one or more sections of the control logic circuitry having one or more faulty output values based on a software program determining whether one or more faulty output values exist.
8. The image sensor of claim 5 , wherein the control logic circuitry comprises at least one of a shift register, a flip-flop, and an address decoder.
9. The image sensor of claim 5 , wherein the disconnected control lines can be controlled with neighboring control logic circuitry.
10. The image sensor of claim 5 , wherein a neighboring control logic circuitry is one or more columns of control logic circuitry located parallel to the control logic circuitry having one or more faulty output values.
11. The image sensor of claim 5 , wherein the control logic circuitry is embedded in the array of light sensitive elements in a stitched pattern.
12. The image sensor of claim 5 , further comprising:
read out circuitry coupled to the array of light sensitive elements, the read out circuitry to read out pixel values for the image sensor.
13. An apparatus, comprising:
means for generating an image based on an array of light sensitive elements and associated control logic, wherein the apparatus is configured for generating an image based on the control logic having no faulty output values;
means for disconnecting control lines from control logic that has one or more faulty output values based on viewing the image, wherein the control logic is coupled to a tri-state buffer logic circuit which is coupled to the control lines;
means for providing light to the array of light sensitive elements; and
means for configuring the tri-state buffer logic circuit associated with control logic having faulty output values in a high impedance tri-state mode in order to disconnect control lines from the control logic having faulty output values.