Pixel Circuit Uniformity via Reset Signal Initialization
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Solution Overview
Problem
Display panels face issues with uniformity in turned-on voltages of light-emitting devices due to variations in film layer thicknesses during manufacturing, leading to color shift and reduced display effect, especially during low gray scale displays.
Innovation Solution
A pixel circuit with a driving circuit and control circuit that transmits initial signals and data signals to generate driving signals and control the turned-on duration of elements, utilizing transistors and capacitors to manage voltage differences and compensate for threshold voltages, ensuring quick and uniform voltage rise across elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If film layer thicknesses are varied during manufacturing, then manufacturing flexibility is improved, but uniformity of turned-on voltages deteriorates
Solution Approach 1:
The patent applies preliminary action by introducing a reset signal before the data signal to initialize the pixel circuit to a known state. This reset operation compensates for variations in film layer thickness by establishing a uniform starting voltage level across all pixels, ensuring consistent turned-on voltages despite manufacturing variations.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting the voltage levels and timing sequences of the reset and data signals. By changing the voltage parameters and temporal characteristics of the driving signals, the circuit compensates for physical variations in film layer thickness, maintaining uniform display characteristics across the display panel.
2Device complexity
If conventional pixel circuits are used, then device complexity is low, but color shift occurs during low gray scale displays
Solution Approach 1:
The reset signal is applied preliminarily before the data signal to prepare the pixel circuit in a standardized initial state. This preliminary initialization ensures that subsequent data signals are processed uniformly across all pixels, preventing color shift during low gray scale displays while adding minimal complexity to the overall circuit design.
Solution Approach 2:
The patent implements a feedback mechanism where the pixel circuit's state is monitored and adjusted through the reset and data signal sequence. This feedback loop compensates for non-linearities in the display elements, eliminating color shift by dynamically adjusting the driving signals based on the actual circuit state.
3Use of energy by moving object
If voltage rise is slow in conventional circuits, then energy consumption is low, but display uniformity deteriorates
Solution Approach 1:
The patent employs periodic action through the sequential application of reset signals followed by data signals. This periodic signaling pattern ensures rapid and uniform voltage rise across all pixels by systematically initializing and updating each pixel in a controlled sequence, achieving display uniformity without excessive energy consumption.
Solution Approach 2:
By applying the reset signal preliminarily to establish a uniform initial voltage state before applying data signals, the circuit achieves rapid and synchronized voltage rise across all pixels. This preliminary initialization ensures that voltage changes occur uniformly and quickly, improving display uniformity while maintaining energy efficiency through controlled signal timing.
Data Source
AI summary
A pixel circuit includes: a driving circuit configured to transmit a first initial signal received at a first initial signal terminal to a control node in response to a first reset signal received at a first reset signal terminal, write a data signal received at a data signal terminal in response to a scan signal received at a scan signal terminal, generate a driving signal according to a first voltage of a first voltage terminal and the data signal in response to an enable signal received at an enable signal terminal, and output the driving signal to an element to be driven; and a control circuit configured to transmit a control signal received at a control signal terminal to the control node in response to a voltage of the control node, so as to control a turned-on duration of the element to be driven in conjunction with the driving signal.