Display Device Dummy Subpixel Sensing Circuit
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As the resolution and driving frequency of display devices increase, there is not enough time to perform a subpixel sensing operation for compensation, necessitating a method to reduce the time required for subpixel sensing.
Innovation Solution
The display device incorporates a display panel with subpixels and dummy subpixels, a driving circuit to output sensing data voltages, and a sensing circuit to acquire a sensing voltage by adding sensing values from a subpixel and a dummy subpixel, allowing for compensation based on the acquired voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If resolution and driving frequency are increased, then display quality and performance are improved, but the time available for subpixel sensing operations decreases
Solution Approach 1:
The sensing operation is segmented into two independent parts: sensing the subpixel and sensing the dummy subpixel. These can be performed in parallel or independently, allowing the sensing process to be divided such that one part does not block the other, thereby reducing total sensing time while maintaining accuracy.
Solution Approach 2:
A dummy subpixel is introduced as an intermediary element that performs the same sensing function as the actual subpixel but does not affect the displayed image. This dummy subpixel can be sensed simultaneously with or independently from the real subpixel, enabling parallel processing and reducing the critical path time for sensing operations.
2Productivity
If subpixel sensing time is reduced to maintain high driving frequency, then productivity is maintained, but measurement precision of subpixel characteristics may deteriorate
Solution Approach 1:
A dummy subpixel that is identical in structure and sensing characteristics to the real subpixel is created. This copy allows the sensing circuit to perform measurements on a duplicate element, ensuring that the measurement process itself does not interfere with the display output while maintaining full sensing accuracy for compensation calculations.
Solution Approach 2:
The dummy subpixel sensing is performed in advance or in parallel with the main display operation. By preparing and measuring the dummy subpixel beforehand or simultaneously, the system ensures that accurate sensing data is available without extending the critical sensing time window that would impact driving frequency.
3Measurement precision
If dummy subpixels are added to the display panel, then sensing capability is improved, but device complexity increases
Solution Approach 1:
The dummy subpixel serves multiple functions: it acts as a sensing element, a reference for compensation calculations, and does not interfere with the display function. This multi-functionality justifies the added complexity by providing enhanced sensing capability without sacrificing display performance.
Solution Approach 2:
The dummy subpixel is placed in a specific location (outer area) of the display panel where it does not interfere with the visible display region. This localized placement allows the sensing function to be enhanced without affecting the overall display quality or requiring complex integration throughout the entire panel structure.
Data Source
AI summary
A display device can include a display panel including subpixels disposed in a display area and dummy subpixels disposed in an outer area of the display panel, a driving circuit configured to output a sensing data voltage for sensing a first subpixel among the subpixels and a first dummy subpixel among the dummy subpixels, and a sensing circuit configured to receive a first sensing value from a sensing node of the first subpixel and a second sensing value from a sensing node of the first dummy subpixel, and generate a sensing voltage based on a sum of the first sensing value and the second sensing value.